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Auteur : Grafiati
Publié le 14 mars 2023

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1

Zhou, Yida, Jiani Zhang, Wenyan Ma, Xin Yin, Guangrui Chen, Yinghao Liu et Jiyang Li. « Small pore SAPO-14-based zeolites with improved propylene selectivity in the methanol to olefins process ». Inorganic Chemistry Frontiers 9, no 8 (2022) : 1752–60. http://dx.doi.org/10.1039/d2qi00155a.

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Xiao, Xia, Zhongliang Xu, Peng Wang, Xinfei Liu, Xiaoqiang Fan, Lian Kong, Zean Xie et Zhen Zhao. « Solvent-Free Synthesis of SAPO-34 Zeolite with Tunable SiO2/Al2O3 Ratios for Efficient Catalytic Cracking of 1-Butene ». Catalysts 11, no 7 (10 juillet 2021) : 835. http://dx.doi.org/10.3390/catal11070835.

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Solvent-free synthesis methodology is a promising technique for the green and sustainable preparation of zeolites materials. In this work, a solvent-free route was developed to synthesize SAPO-34 zeolite. The characterization results indicated that the crystal size, texture properties, acidity and Si coordination environment of the resulting SAPO-34 were tuned by adjusting the SiO2/Al2O3 molar ratio in the starting mixture. Moreover, the acidity of SAPO-34 zeolite was found to depend on the Si coordination environment, which was consistent with that of SAPO-34 zeolite synthesized by the hydrothermal method. At an SiO2/Al2O3 ratio of 0.6, the SP-0.6 sample exhibited the highest conversion of 1-butene (82.8%) and a satisfactory yield of light olefins (51.6%) in the catalytic cracking of 1-butene, which was attributed to the synergistic effect of the large SBET (425 m2/g) and the abundant acid sites (1.82 mmol/g). This work provides a new opportunity for the design of efficient zeolite catalysts for industrially important reactions.
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Usman, Muhammad. « Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation : A Review ». Membranes 12, no 5 (10 mai 2022) : 507. http://dx.doi.org/10.3390/membranes12050507.

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In the zeolite family, the silicoaluminophosphate (SAPO)-34 zeolite has a unique chemical structure, distinctive pore size, adsorption characteristics, as well as chemical and thermal stability, and recently, has attracted much research attention. Increasing global carbon dioxide (CO2) emissions pose a serious environmental threat to humans, animals, plants, and the entire environment. This mini-review summarizes the role of SAPO-34 zeolite membranes, including mixed matrix membranes (MMMs) and pure SAPO-34 membranes in CO2 separation. Specifically, this paper summarizes significant developments in SAPO-34 membranes for CO2 removal from air and natural gas. Consideration is given to a variety of successes in SAPO-34 membranes, and future ideas are described in detail to foresee how SAPO-34 could be employed to mitigate greenhouse gas emissions. We hope that this study will serve as a detailed guide to the use of SAPO-34 membranes in industrial CO2 separation.
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Junaidi, M. U. M., C. P. Leo, S. N. M. Kamal et A. L. Ahmad. « Fouling mitigation in humic acid ultrafiltration using polysulfone/SAPO-34 mixed matrix membrane ». Water Science and Technology 67, no 9 (1 mai 2013) : 2102–9. http://dx.doi.org/10.2166/wst.2013.098.

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Although ultrafiltration (UF) membranes are applicable in wastewater and water treatment, most UF membranes are hydrophobic and susceptible to severe fouling by natural organic matter. In this work, polysulfone (PSf) membrane was blended with silicaluminophosphate (SAPO) nanoparticles, SAPO-34, to study the effect of SAPO-34 incorporation in humic acid (HA) fouling mitigation. The casting solution was prepared by blending 5–20 wt% of SAPO-34 nanoparticles into the mixture of PSf, 1-methyl-2-pyrrolidinone and polyvinyl alcohol at 75 °C. All membrane samples were then prepared using the phase inversion method. Blending SAPO-34 zeolite into PSf membranes caused augmentation in surface hydrophilicity and pore size, leading to higher water permeation. In the HA filtration test, mixed matrix membranes (MMMs) with SAPO-34 zeolite showed reduced HA fouling initiated from pore blocking. The MMM with 20 wt% SAPO-34 loading exhibited the highest increment of water permeation (83%) and maintained about 75% of permeate flux after 2.5 h. However, the SAPO-34 fillers agglomerated in the PSf matrix and induced macrovoid formation on the membrane surface when excessive zeolite was added.
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Wang, Bin, Ying Zhang, Fu Bo Gu, Min Zuo et Guang Sheng Guo. « Acid Strength Measurement of Zeolites by the TPD-IR Technique with Ammonia as Probe Molecule ». Applied Mechanics and Materials 475-476 (décembre 2013) : 1270–74. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.1270.

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An improved TPD-IR technique was developed recently. By which means, acid properties of Brønsted acid sites on HY zeolite and SAPO-34 zeolite were studied by an advanced TPD-IR technique with ammonia as probe molecule. Desorption activation energy (DAE) of the probe molecule adsorbed on zeolite was used as a measure of the acid strength. The result indicates the Brønsted acid sites of HY Zeolite or SAPO-34 zeolite were divided into two types with the strength of DAE of ammonia 43.4KJ/mol, 24.4KJ/mol and 33.2KJ/mol, 20.5KJ/mol. It is concluded that HY zeolite has the stronger Brønsted acid sites than that of SAPO-34 zeolite.
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6

Usman, Muhammad, Jiang Zhu, Kong Chuiyang, Muhammad Tahir Arslan, Abuzar Khan, Ahmad Galadima, Oki Muraza et al. « Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures ». Catalysts 9, no 11 (5 novembre 2019) : 919. http://dx.doi.org/10.3390/catal9110919.

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Propene is an important synthetic industrial product predominantly formed by a methanol-to-olefins (MTO) catalytic process. Propene is known to form oligomers on zeolite catalysts, and paramters to separate it from mixtures and its diffusion properties are difficult to measure. Herein, we explored the adsorption–chemisorption behavior of propene by choosing SAPO-34 zeolites with three different degrees of acidity at various adsorption temperatures in an ultra-high-vacuum adsorption system. H-SAPO-34 zeolites were prepared by a hydrothermal method, and their structural, morphological, and acidic properties were investigated by XRD, SEM, EDX, and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The XRD analysis revealed the highly crystalline structure which posses cubic morphology as confirmed by SEM images. The analysis of adsorption of propene on SAPO-34 revealed that a chemical reaction (chemisorption) was observed between zeolite and propene at room temperature (RT) when the concentration of acidic sites was high (0.158 mmol/g). The reaction was negligible when the concentration of the acidic sites was low (0.1 mmol/g) at RT. However, the propene showed no reactivity with the highly acidic SAPO-34 at low temperatures, i.e., −56 °C (using octane + dry ice), −20 °C (using NaCl + ice), and 0 °C (using ice + water). In general, low-temperature conditions were found to be helpful in inhibiting the chemisorption of propene on the highly acidic H-SAPO-34 catalysts, which can facilitate propene separation and allow for reliable monitoring of kinetic parameters.
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Chen, Xueshuai, Rongli Jiang, Huilin Hou, Zihan Zhou et Xingwen Wang. « Synthesis of ZSM-5/SAPO-34 zeolite composites from LAPONITE® and their catalytic properties in the MTO reaction ». CrystEngComm 22, no 37 (2020) : 6182–88. http://dx.doi.org/10.1039/d0ce01002b.

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8

Chen, Yanping, Yiming Xu, Dang-guo Cheng, Yingcai Chen, Fengqiu Chen, Xiaoyong Lu, Yiping Huang et Songbo Ni. « Synthesis of CuO–ZnO–Al2O3 @ SAPO-34 core@shell structured catalyst by intermediate layer method ». Pure and Applied Chemistry 86, no 5 (19 mai 2014) : 775–83. http://dx.doi.org/10.1515/pac-2013-1121.

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AbstractThe present study focuses on synthesis of SAPO-34 zeolite membrane on the surface of CuO–ZnO–Al2O3 (CZA) catalyst particles to form CZA@SAPO-34 core@shell structured catalyst. In contrast to the traditional support of porous alumina, CZA catalyst particles have a relatively brittle surface, which leads to a big challenge to coat SAPO-34 zeolite membrane on their surface. Moreover, the hydrothermal synthesis of SAPO-34 zeolite membrane is carried out under weakly alkaline condition at 200 °C for hours, which causes part of the surface of CZA to be fragmented. To overcome these shortcomings, the intermediate layer of alumina is introduced to the surface of the CZA particles and acts as a barrier to the high-temperature hydrothermal and alkaline condition. It also takes as a transition to enhance SAPO-34 zeolite seeds adherence to the surface of CZA particles. With the help of an alumina layer, a continuous and dense zeolite membrane has been obtained on the surface of CZA particles. The prepared core@shell structured catalyst has better selectivity in CO hydrogenation for producing light hydrocarbons because of the synergetic effects between the membrane and core catalyst.
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Xia, Wei, Qi Sun, Shang Wen Liu, Lin Ping Qiang et Yuan Cun Cui. « SAPO-34/SiO2 Catalysts for the Transformation of Ethanol into Propylene ». Advanced Materials Research 1004-1005 (août 2014) : 707–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.707.

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Ethanol has great potential to be a candidate for the source of light olefins such as ethylene and propylene. However, ethanol to olefin (ETO) process has not been fully investigated. In this work, the conversion reactions of ethanol were carried out at 673 K under atmospheric pressure on SAPO-34 and SAPO-34/SiO2 catalysts. SAPO-34 and SAPO-34/SiO2 exhibit higher selectivity for propylene than H-ZSM-5 zeolite catalysts do. The SAPO-34 with silica binder showed better catalytic performance for the transformation of ethanol to propylene than the SAPO-34 catalyst.
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10

Li, Duichun, Bin Xing, Baojun Wang et Ruifeng Li. « Theoretical Study of Zirconium Isomorphous Substitution into Zeolite Frameworks ». Molecules 24, no 24 (5 décembre 2019) : 4466. http://dx.doi.org/10.3390/molecules24244466.

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Systematic periodic density functional theory computations including dispersion correction (DFT-D) were carried out to determine the preferred location site of Zr atoms in sodalite (SOD) and CHA-type topology frameworks, including alumino-phosphate-34 (AlPO-34) and silico-alumino-phosphate-34 (SAPO-34), and to determine the relative stability and Brönsted acidity of Zr-substituted forms of SOD, AlPO-34, and SAPO-34. Mono and multiple Zr atom substitutions were considered. The Zr substitution causes obvious structural distortion because of the larger atomic radius of Zr than that of Si, however, Zr-substituted forms of zeolites are found to be more stable than pristine zeolites. Our results demonstrate that in the most stable configurations, the preferred favorable substitutions of Zr in substituted SOD have Zr located at the neighboring sites of the Al-substituted site. However, in the AlPO-34 and SAPO-34 frameworks, the Zr atoms are more easily distributed in a dispersed form, rather than being centralized. Brönsted acidity of substituted zeolites strongly depends on Zr content. For SOD, substitution of Zr atoms reduces Brönsted acidity. However, for Zr-substituted forms of AlPO-34 and SAPO-34, Brönsted acidity of the Zr-O(H)-Al acid sites are, at first, reduced and, then, the presence of Zr atoms substantially increased Brönsted acidity of the Zr-O(H)-Al acid site. The results in the SAPO-34-Zr indicate that more Zr atoms substantially increase Brönsted acidity of the Si-O(H)-Al acid site. It is suggested that substituted heteroatoms play an important role in regulating and controlling structural stability and Brönsted acidity of zeolites.
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11

Malara, Angela, Patrizia Frontera, Lucio Bonaccorsi et Pier Antonucci. « Hybrid Zeolite SAPO-34 Fibres Made by Electrospinning ». Materials 11, no 12 (15 décembre 2018) : 2555. http://dx.doi.org/10.3390/ma11122555.

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A new generation of compressor-free heat pumps based on adsorption technology and driven by solar energy is available. Performance and costs are, however, the main obstacles to their commercial diffusion, and more material and system developments are required. In this work, a new coating made of microfibres produced by the electrospinning of polymer/zeolite mixtures is presented. Three different polymer carriers, polyvinyl acetate, polyethylene oxide and polystyrene, have been used together with zeolite SAPO-34 as an adsorbing material. Electrospun microfibres showed a mean diameter ranging from 0.75 μm to 2.16 μm depending on the polymer carrier, with a zeolite content from 60 wt.% to 87 wt.%. Thermal analysis (TGA-DSC) results showed that water desorption from microfibres at T = 150 °C was close to 17 wt.%, a value in agreement with the adsorption capacity of pure SAPO-34. The morphology characterization of coatings demonstrated that the microfibre layers are highly porous and have an elevated surface area.
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12

Amini, S., et A. Dyer. « Actinide uptake onto zeolite-L and SAPO-34 ». Journal of Radioanalytical and Nuclear Chemistry Articles 178, no 2 (mars 1994) : 273–89. http://dx.doi.org/10.1007/bf02039721.

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13

Cai, Weibin, Jiangyu Xie, Jingyu Luo, Xiaohan Chen, Mingqian Wang, Yujun Wang et Jiding Li. « n-Octyltrichlorosilane Modified SAPO-34/PDMS Mixed Matrix Membranes for Propane/Nitrogen Mixture Separation ». Separations 9, no 3 (28 février 2022) : 64. http://dx.doi.org/10.3390/separations9030064.

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In this study, zeolite molecular sieve SAPO-34/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared to recover propane. n-Octyltrichlorosilane (OTCS) was introduced to improve compatibility between SAPO-34 and PDMS, and enhance the separation performance of the MMMs. Physicochemical properties of the MMMs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and water contact angle (WCA). Results showed that, after modification, alkyl chains were successfully grafted onto SAPO-34 without changing its crystal structure, particles in the MMMs were evenly distributed in the base film, and the hydrophobicity of the MMMs was enhanced. Moreover, the effects of SAPO-34 filling content, operating pressure, and feed gas concentration on the separation performance was explored. This indicated that the modification with OTCS effectively enhanced the separation performance of SAPO-34/PDMS MMMs. When the filling content of modified SAPO-34 was 15%, the maximal separation factor of 22.1 was achieved, and the corresponding propane permeation rate was 101 GPU.
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Yu, Yuehong, Jiaxiang Qin, Min Xiao, Shuanjin Wang, Dongmei Han et Yuezhong Meng. « Performance Enhanced SAPO-34 Catalyst for Methanol to Olefins : Template Synthesis Using a CO2-Based Polyurea ». Catalysts 9, no 1 (28 décembre 2018) : 16. http://dx.doi.org/10.3390/catal9010016.

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Introducing mesopores into the channels and cages of conventional micropores CHA (Chabazite) topological structure SAPO-34 molecular sieves can effectively improve mass transport, retard coke deposition rate and enhance the catalytic performance for methanol to olefins (MTO) reaction, especially lifetime and olefins selectivity. In order to overcome the intrinsic diffusion limitation, a novel CO2-based polyurea copolymer with affluent amine group, ether segment and carbonyl group has been firstly applied to the synthesis of SAPO-34 zeolite under hydrothermal conditions. The as-synthesized micro-mesoporosity SAPO-34 molecular sieve catalysts show heterogeneous size distribution mesopores and exhibit slightly decrease of BET surface area due to the formation of defects and voids. Meanwhile, the catalysts exhibit superior catalytic performance in the MTO reaction with more than twice prolonged catalytic lifespan and improvement of selectivity for light olefins compared with conventional microporous SAPO-34. The methodology provides a new way to synthesize and control the structure of SAPO-34 catalysts.
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Lin, Qingjin, Shuang Liu, Shuhao Xu, Shi Xu, Mingming Pei, Pan Yao, Haidi Xu, Yi Dan et Yaoqiang Chen. « Comprehensive effect of tuning Cu/SAPO-34 crystals using PEG on the enhanced hydrothermal stability for NH3-SCR ». Catalysis Science & ; Technology 11, no 23 (2021) : 7640–51. http://dx.doi.org/10.1039/d1cy01194d.

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Liu, Ziyu, Shu Ren, Xing Yu, Xinqing Chen, Gang Wang, Xian Wu, Gan Yu, Minghuang Qiu, Chengguang Yang et Yuhan Sun. « Melting-assisted solvent-free synthesis of hierarchical SAPO-34 with enhanced methanol to olefins (MTO) performance ». Catalysis Science & ; Technology 8, no 2 (2018) : 423–27. http://dx.doi.org/10.1039/c7cy02283b.

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17

Slawinski, Wojciech, David Wragg, Duncan Akporiaye et Helmer Fjellvag. « Modeling of SAPO-18/34 intergrowth crystal structure ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C625. http://dx.doi.org/10.1107/s2053273314093747.

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"Aluminophosphate framework structures have been widely studied because of their many technological applications. The most significant application of aluminophosphate type framework catalysts is in the methanol-to-olefin (MTO) conversion process [1], catalysed by SAPO-34 (the silicoaluminophosphate form of the chabazite (CHA) zeolite framework with silicon substituted into its structure). The effectiveness of SAPO-34 in the MTO process is due to both the shape selective properties of the framework and the concentration and strengths of the acid sites created by silicon substitution [2]. Another aluminophosphate framework MTO catalyst is SAPO-18 (zeolite framework type (AEI)), which has a very closely related structure to SAPO-34 and can form intergrowths with it. It has been suggested that the level of intergrowth can affect the efficiency of the MTO process [3], however, assessment of the level of intergrowth has remained difficult. We present a consistent model of the crystal structure of SAPO-18/34 family members which can accurately determine the level of intergrowth. The model utilises two types of stacking fault: Displacement and Growth which have significantly different effects on the diffraction pattern. A series of powder diffraction patterns is calculated using the Discus software package. Changes in the level of intergrowth and stacking fault type strongly affect the calculated pattern. A series of patterns has been calculated to illustrate this. The structure of an intergrown SAPO-34 sample with 4.8% Si content is modelled and refined using Displacement stacking faults. An example of ""defect-free"" AlPO-18 (0% Si content) is then presented. Refinement of the model shows that even this contains a small amount of stacking faults. Finally, a simple method for defect level estimation is proposed based on FWHM (Full Width at Half Maximum) ratios for selected Bragg reflections."
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Liu, Yongsheng, Kyosuke Takata, Yu Mukai, Hidetoshi Kita et Kazuhiro Tanaka. « Nano-porous Zeolite and MOF Filled Mixed Matrix Membranes for Gas Separation ». MATEC Web of Conferences 333 (2021) : 04008. http://dx.doi.org/10.1051/matecconf/202133304008.

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The commercial SAPO-34 zeolite with 0.38 nm pore size and ZIF-8 particles with 0.34 nm aperture size were separately dispersed into different polymer matrix, to prepare the mixed matrix membranes (MMMs) for gas separation. The dispersed situation of the SAPO-34 and ZIF-8 particles in matrix and the influence of the fillers on the separation performance of the membrane had been investigated in this study. The as-synthesized MMMs showed a better trade-off between permeability and selectivity than the pure polymer membrane and the performance could exceed or close to the upper bound line of polymer membrane for CO2 and CH4 separation. The CO2 permeability and CO2/CH4 ideal selectivity of the 6FDA-mDAT MMM containing 40 wt% SAPO-34 zeolite was 190 barrer and ca. 60, respectively. The 6FDA-TrMPD based MMMs containing 20 wt% ZIF-8 provided a permeability of C3H6 and an ideal selectivity of C3H6/C3H8 at 24 barrer and ca. 17, respectively. These separation performances were in a suitable agreement of the theoretical value from Maxwell model.
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Liu, Yongsheng, Kyosuke Takata, Yu Mukai, Hidetoshi Kita et Kazuhiro Tanaka. « Nano-porous Zeolite and MOF Filled Mixed Matrix Membranes for Gas Separation ». MATEC Web of Conferences 333 (2021) : 04008. http://dx.doi.org/10.1051/matecconf/202133304008.

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The commercial SAPO-34 zeolite with 0.38 nm pore size and ZIF-8 particles with 0.34 nm aperture size were separately dispersed into different polymer matrix, to prepare the mixed matrix membranes (MMMs) for gas separation. The dispersed situation of the SAPO-34 and ZIF-8 particles in matrix and the influence of the fillers on the separation performance of the membrane had been investigated in this study. The as-synthesized MMMs showed a better trade-off between permeability and selectivity than the pure polymer membrane and the performance could exceed or close to the upper bound line of polymer membrane for CO2 and CH4 separation. The CO2 permeability and CO2/CH4 ideal selectivity of the 6FDA-mDAT MMM containing 40 wt% SAPO-34 zeolite was 190 barrer and ca. 60, respectively. The 6FDA-TrMPD based MMMs containing 20 wt% ZIF-8 provided a permeability of C3H6 and an ideal selectivity of C3H6/C3H8 at 24 barrer and ca. 17, respectively. These separation performances were in a suitable agreement of the theoretical value from Maxwell model.
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Yang, Guangpeng, Jingyu Ran, Xuesen Du, Xiangmin Wang, Zhilin Ran, Yanrong Chen, Li Zhang et John Crittenden. « Understanding the nature of NH3-coordinated active sites and the complete reaction schemes for NH3-SCR using Cu-SAPO-34 catalysts ». Physical Chemistry Chemical Physics 23, no 8 (2021) : 4700–4710. http://dx.doi.org/10.1039/d0cp06285e.

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Xi, Dongyang, Qiming Sun, Xiaoxin Chen, Ning Wang et Jihong Yu. « The recyclable synthesis of hierarchical zeolite SAPO-34 with excellent MTO catalytic performance ». Chemical Communications 51, no 60 (2015) : 11987–89. http://dx.doi.org/10.1039/c5cc03904e.

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Denning, Shurraya, Jolie Lucero, Carolyn A. Koh et Moises A. Carreon. « Chabazite Zeolite SAPO-34 Membranes for He/CH4 Separation ». ACS Materials Letters 1, no 6 (6 novembre 2019) : 655–59. http://dx.doi.org/10.1021/acsmaterialslett.9b00324.

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Chew, Thiam Leng, et Abdul Latif Ahmad. « Gas Permeation Properties of Modified SAPO-34 Zeolite Membranes ». Procedia Engineering 148 (2016) : 1225–31. http://dx.doi.org/10.1016/j.proeng.2016.06.471.

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Calabrese, L., L. Bonaccorsi, P. Bruzzaniti, E. Proverbio et A. Freni. « SAPO-34 based zeolite coatings for adsorption heat pumps ». Energy 187 (novembre 2019) : 115981. http://dx.doi.org/10.1016/j.energy.2019.115981.

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Yu, Miao, Shiguang Li, John L. Falconer et Richard D. Noble. « Reversible H2 storage using a SAPO-34 zeolite layer ». Microporous and Mesoporous Materials 110, no 2-3 (avril 2008) : 579–82. http://dx.doi.org/10.1016/j.micromeso.2007.06.017.

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Sun, Qiming, Ning Wang, Guanqi Guo, Xiaoxin Chen et Jihong Yu. « Synthesis of tri-level hierarchical SAPO-34 zeolite with intracrystalline micro–meso–macroporosity showing superior MTO performance ». Journal of Materials Chemistry A 3, no 39 (2015) : 19783–89. http://dx.doi.org/10.1039/c5ta04642d.

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Tri-level hierarchically porous SAPO-34 zeolite with an intracrystalline micro–meso–macropore structure has been synthesized exhibiting remarkably enhanced performance in the methanol-to-olefin reaction.
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Bonaccorsi, Lucio, Luigi Calabrese, Stefano De Antonellis, Angelo Freni, Cesare Joppolo et Mario Motta. « Composite silicone-SAPO-34 foams : experimental characterization for open cycle applications ». E3S Web of Conferences 111 (2019) : 06053. http://dx.doi.org/10.1051/e3sconf/201911106053.

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In this work, novel composite silicone-SAPO-34 foams have been prepared and experimentally characterized for application in desiccant open cycles. Water adsorption isotherms of several samples have been measured by a gravimetric dynamic vapour sorption analyser at 30°C and 70°C up to the relative humidity RH= 75%, representing typical process and regeneration air conditions in desiccant evaporative cooling cycles. Adsorbent foams manufactured with 20%, 40% and 60% weight fraction of SAPO-34 have been compared with the pure SAPO-34 powder. Results highlighted that the prepared foams adsorb a significant amount of water, according to the initial mass fraction of zeolite used in the compound. Moreover, the tested foams exhibited sufficiently fast water sorption rate for practical application in a desiccant open cycle system.
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Sun, Qiming, Ning Wang, Guanqi Guo et Jihong Yu. « Ultrafast synthesis of nano-sized zeolite SAPO-34 with excellent MTO catalytic performance ». Chemical Communications 51, no 91 (2015) : 16397–400. http://dx.doi.org/10.1039/c5cc07343j.

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Amari, Imen, et M. H. Chahbani. « Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO-34 Coating for an Adsorption Heat Pump ». Advances in Materials Science and Engineering 2021 (30 septembre 2021) : 1–11. http://dx.doi.org/10.1155/2021/3706981.

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Heat and mass transfers inside an adsorbent bed of an adsorption heat pump (AHP) are considered poor; consequently, they can cause low system performance. They should be enhanced so as to increase the coefficient of performance of the cooling machine. The aim of this work is to study an adsorbent bed coated with the zeolite SAPO-34. A simulation model based on governing equations for energy, mass, and momentum transfers is developed using COMSOL Multiphysics software. The system zeolite SAPO-34/water has been considered. Modeling results are validated by experimental database available at the Institute for Advanced Energy Technologies “Nicola Giordano,” Italy. It has been shown that the adsorption heat pump performance is affected by both heat and mass transfer. The enhancement of heat transfer solely is not sufficient to attain high values of specific cooling power. In the case of water vapor/SAPO-34 pair, mass transfer has a significant impact on the duration of the cooling step which should be shortened if one would want to increase the specific cooling power. The sole way to do it is to enhance mass transfer inside porous adsorbent.
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Li, Xin, Fateme Rezaei, Douglas K. Ludlow et Ali A. Rownaghi. « Synthesis of SAPO-34@ZSM-5 and SAPO-34@Silicalite-1 Core–Shell Zeolite Composites for Ethanol Dehydration ». Industrial & ; Engineering Chemistry Research 57, no 5 (26 janvier 2018) : 1446–53. http://dx.doi.org/10.1021/acs.iecr.7b05075.

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Xu, Jeff, Kok-Giap Haw, Zhan Li, Subhasis Pati, Zhigang Wang et Sibudjing Kawi. « A mini-review on recent developments in SAPO-34 zeolite membranes and membrane reactors ». Reaction Chemistry & ; Engineering 6, no 1 (2021) : 52–66. http://dx.doi.org/10.1039/d0re00349b.

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Raveendra, G., Congming Li, Bin Liu, Yang Cheng, Fanhui Meng et Zhong Li. « Synthesis of lower olefins from syngas over Zn/Al2O3–SAPO-34 hybrid catalysts : role of doped Zr and influence of the Zn/Al2O3ratio ». Catalysis Science & ; Technology 8, no 14 (2018) : 3527–38. http://dx.doi.org/10.1039/c8cy00574e.

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Hybrid catalysts composed of different loadings of Zr-promoted Zn/Al2O3with SAPO-34 zeolite were investigated for the direct synthesis of lower olefins from syngas in a fixed-bed reactor.
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Meng, Danni, Xue Kong, Xiaoxue Tang, Wanying Guo, Senlin Yang, Ye Zhang, Heng'e Qiu, Yanfeng Zhang et Zefang Zhang. « Thin SAPO-34 zeolite membranes prepared by ball-milled seeds ». Separation and Purification Technology 274 (novembre 2021) : 118975. http://dx.doi.org/10.1016/j.seppur.2021.118975.

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Leng Chew, Thiam. « Ba-SAPO-34 ZEOLITE MEMBRANE FOR CO2 AND N2 PERMEATION ». Malaysian Journal of Analytical Science 20, no 6 (8 décembre 2016) : 1397–404. http://dx.doi.org/10.17576/mjas-2016-2006-19.

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Zhang, Ye, Mingquan Wang, Heng'e Qiu, Lin Kong, Ning Xu, Xiaoxue Tang, Danni Meng, Xue Kong et Yanfeng Zhang. « Synthesis of thin SAPO-34 zeolite membranes in concentrated gel ». Journal of Membrane Science 612 (octobre 2020) : 118451. http://dx.doi.org/10.1016/j.memsci.2020.118451.

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Li, Zhaoyang, Geng Chen, Zhenghua Shao, Haonan Zhang et Xiujuan Guo. « The Effect of Iron Content on the Ammonia Selective Catalytic Reduction Reaction (NH3-SCR) Catalytic Performance of FeOx/SAPO-34 ». International Journal of Environmental Research and Public Health 19, no 22 (10 novembre 2022) : 14749. http://dx.doi.org/10.3390/ijerph192214749.

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Iron-based catalysts are regarded as promising candidates for the ammonia selective catalytic reduction reaction (NH3-SCR) which show good catalytic activity at medium and high temperatures, whereas SAPO-34 molecular sieves have a micro-pore structure and are ideal catalyst carriers. In this paper, four FeOx/SAPO-34 molecular sieve catalysts with different iron contents (Fe = 1%, 2%, 3%, 4%) were prepared using an impregnation method. The effect of iron content on the surface properties and catalytic activity was investigated by a series of characterization techniques including XRD, SEM, BET, XPS, H2-TPR and NH3-TPD. Iron species in the FeOx/SAPO-34 catalysts exist in the form of isolated iron ions or well-dispersed small crystals and iron oxide species clusters. With the addition of iron content, the integrity of CHA (chabazite) zeolite structure remained, but the crystallinity was affected. The FeOx/SAPO-34 catalyst with 3% Fe loading showed a relatively flat surface with no large-diameter particles and strong oxidation-reduction ability. Meanwhile, more acidic sites are exposed, which accelerated the process of catalytic reaction. Thus, the FeOx/SAPO-34 catalyst with 3% Fe showed the best NO conversion performance among the four catalysts prepared and maintained more than 90% NO conversion efficiency in a wide temperature range from 310 °C to 450 °C.
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Zhang, Wenyu, Sen Wang, Shujia Guo, Zhangfeng Qin, Mei Dong, Jianguo Wang et Weibin Fan. « Effective conversion of CO2 into light olefins over a bifunctional catalyst consisting of La-modified ZnZrOx oxide and acidic zeolite ». Catalysis Science & ; Technology 12, no 8 (2022) : 2566–77. http://dx.doi.org/10.1039/d2cy00210h.

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Addition of proper amount of La produces more oxygen vacancies on ZnZrOx(nLa), hence promoting the formation of methanol. Upon coupling with H-SAPO-34, ZnZrOx(0.3La)/H-SAPO-34 catalyst shows a C2=–C4= selectivity in hydrocarbons as high as 83.2%.
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Bai, Xue, Bo Chen, Fei Yang, Xianping Liu, Daniel Silva-Nunes et Ian Robinson. « Three-dimensional imaging and analysis of the internal structure of SAPO-34 zeolite crystals ». RSC Advances 8, no 59 (2018) : 33631–36. http://dx.doi.org/10.1039/c8ra05918g.

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Goshima, Takashi, Keisuke Ikeda, Kenta Fukudome, Kei Mizuta, Shuji Mitsuyoshi et Toshio Tsutsui. « Conversion of Biomass-Derived Oxygen-Containing Intermediates into Chemical Raw Materials with Zeolite ». Applied Mechanics and Materials 625 (septembre 2014) : 298–305. http://dx.doi.org/10.4028/www.scientific.net/amm.625.298.

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To establish a new production route of biomass-derived BTX and propylene, the catalytic conversion of oxygen-containing intermediates which are furfural, levulinic acid, acetic acid or butyric acid, obtained by hydrothermal reactions of bagasse or fermentation of molasses was investigated with zeolites, ZSM-5, SAPO-11 and SAPO-34. Levulinic acid and acetic acid were suitable for generating BTX with ZSM-5. On the other hand, the butyric acid was valuable for converting to chemical raw materials with ZSM-5. By using SAPO-11 as the catalyst, butyric acid converted to propylene at high yields. The yield for propylene was the maximum value 58.8C% at 723K, especially the ratio of propylene to gaseous hydrocarbon products increased up to 90.4C%.
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Liu, Zhen, Hu Li, Tingting Zhang, Yi Wang, Pengwu Shi, Yu Wang, Fazle Subhan, Xinmei Liu et Zifeng Yan. « Mother liquor induced preparation of SAPO-34 zeolite for MTO reaction ». Catalysis Today 358 (décembre 2020) : 109–15. http://dx.doi.org/10.1016/j.cattod.2020.03.034.

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Bonaccorsi, Lucio, Pietro Calandra, Heinz Amenitsch, Edoardo Proverbio et Domenico Lombardo. « Growth of fractal aggregates during template directed SAPO-34 zeolite formation ». Microporous and Mesoporous Materials 167 (février 2013) : 3–9. http://dx.doi.org/10.1016/j.micromeso.2012.10.024.

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Hye Kwon, Yeon, Christine Kiang, Emily Benjamin, Phillip Crawford, Sankar Nair et Ramesh Bhave. « Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes ». AIChE Journal 63, no 2 (27 juillet 2016) : 761–69. http://dx.doi.org/10.1002/aic.15434.

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Zhou, Lusha, Jinkun Guan, Chenglong Yu et Bichun Huang. « MnOx Supported on Hierarchical SAPO-34 for the Low-Temperature Selective Catalytic Reduction of NO with NH3 : Catalytic Activity and SO2 Resistance ». Catalysts 11, no 3 (27 février 2021) : 314. http://dx.doi.org/10.3390/catal11030314.

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The ethanol dispersion method was employed to synthesize a series of MnOx/SAPO-34 catalysts using SAPO-34 with the hierarchical pore structure as the zeolite carrier, which were prepared by facile acid treatment with citric acid. Physicochemical properties of catalysts were characterized by XRD, XPS, BET, TEM, NH3-TPD, SEM, FT-IR, Py-IR, H2-TRP and TG/DTG. NH3-SCR performances of the hierarchical MnOx/SAPO-34 catalysts were evaluated at low temperatures. Results show that citric acid etching solution at a concentration of 0.1 mol/L yielded a hierarchical MnOx/SAPO-34-0.1 catalyst with ca.15 wt.% Mn loading, exhibiting optimal catalytic activity and SO2 tolerance at low temperatures. Almost 100% NO conversion and over 90% N2 selectivity at 120 °C under a gas hourly space velocity (GHSV) of 40,000 h−1 could be obtained over this sample. Furthermore, the NO conversion was still higher than 65% when 100 ppm SO2 was introduced to the reaction gas for 4 h. These could be primarily attributed to the large specific surface area, high surface acidity concentration and abundant chemisorbed oxygen species provided by the hierarchical pore structure, which could also increase the mass transfer of the reaction gas. This finding suggests that the NH3-SCR activity and SO2 poisoning tolerance of hierarchical MnOx/SAPO-34 catalysts at low temperatures can be improved by controlling the morphology of the catalysts, which might supply a rational strategy for the design and synthesis of Mn-based SCR catalysts.
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Gao, Feng. « Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts ». Catalysts 10, no 11 (14 novembre 2020) : 1324. http://dx.doi.org/10.3390/catal10111324.

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Cu-exchanged small-pore zeolites have been extensively studied in the past decade as state-of-the-art selective catalytic reduction (SCR) catalysts for diesel engine exhaust NOx abatement for the transportation industry. During this time, Fe-exchanged small-pore zeolites, e.g., Fe/SSZ-13, Fe/SAPO-34, Fe/SSZ-39 and high-silica Fe/LTA, have also been investigated but much less extensively. In comparison to their Cu-exchanged counterparts, such Fe/zeolite catalysts display inferior low-temperature activities, but improved stability and high-temperature SCR selectivities. Such characteristics entitle these catalysts to be considered as key components of highly efficient emission control systems to improve the overall catalyst performance. In this short review, recent studies on Fe-exchanged small-pore zeolite SCR catalysts are summarized, including (1) the synthesis of small-pore Fe/zeolites; (2) nature of the SCR active Fe species in these catalysts as determined by experimental and theoretical approaches, including Fe species transformation during hydrothermal aging; (3) SCR reactions and structure-function correlations; and (4) a few aspects on industrial applications.
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Wu, Jianbing, Sen Wang, Haitao Li, Yin Zhang, Ruiping Shi et Yongxiang Zhao. « The Synergistic Effect of Acidic Properties and Channel Systems of Zeolites on the Synthesis of Polyoxymethylene Dimethyl Ethers from Dimethoxymethane and Trioxymethylene ». Nanomaterials 9, no 9 (23 août 2019) : 1192. http://dx.doi.org/10.3390/nano9091192.

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A series of zeolites with different topology structures, including SAPO-34, SUZ-4, ZSM-5, USY, MOR, and beta, were used to synthesize polyoxymethylene dimethyl ethers (PODEn) from dimethoxymethane (DMM) and trioxymethylene (TOM). The influence of acidic properties and channel systems were studied by activity evaluation, characterization, and theoretical calculation. The results confirmed that pore mouth diameter larger than a TOM molecule was an essential prerequisite for the synthesis of PODEn over zeolites, and the synergistic effect between medium-strong Brønsted acid sites (Brønsted MAS) and the maximal space of zeolites available determined the catalytic performance of all studied zeolites. DMM and TOM were firstly decomposed into methoxymethoxy groups (MMZ) and monomer CH2O over Brønsted MAS. Subsequently, the steric constraint of the maximum included sphere, with an appropriate size in zeolite channels, can promote the combination of CH2O and MMZ to form transition species ZO(CH2O)nCH3, which reacted with the methyl-end group to form PODEn over Brønsted MAS. Moreover, the reaction temperature showed different effects on the product selectivity and distribution, which also mainly depends on the size of the maximum space available in zeolite channels.
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Ting-ting, Xu, Li Gang-gang, Zheng Kai-hua, Zhang Xin-yan, Zhang Xin et Zhang Shao-qing. « Effective reduction of nitric oxide over a core–shell Cu-SAPO-34@Fe-MOR zeolite catalyst ». RSC Advances 13, no 1 (2023) : 638–51. http://dx.doi.org/10.1039/d2ra06708k.

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A core–shell catalyst of Cu-SAPO-34@Fe-MOR was successfully prepared through a silica-sol adhesion method with increased high-temperature activity, broadened reaction temperature window, and increased hydrothermal stability.
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Ng, Tiffany Yit Siew, Vinosha Viriya, Thiam Leng Chew, Yin Fong Yeong, Abdul Latif Ahmad, Chii-Dong Ho et Zeinab Abbas Jawad. « Optimization of CO2/H2 Separation over Ba-SAPO-34 Zeolite Membrane Synthesized by Microwave Heating ». Membranes 12, no 9 (30 août 2022) : 850. http://dx.doi.org/10.3390/membranes12090850.

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CO2/H2 separation using membrane technology is an important research area in order to obtain high purity hydrogen as one source of clean energy. Finding a suitable inorganic membrane is one of the critical issues, which needs to be explored for CO2/H2 separation. In the present study, Ba-SAPO-34 zeolite membrane was synthesized and followed by a modification process. CO2/H2 separation of the membrane was investigated by varying the independent process variables (CO2 % in the feed, pressure difference across the membrane and temperature). Modeling and optimization for the responses (CO2/H2 separation selectivity and CO2 permeance) was performed by applying response surface methodology and central composite design, which is available in Design Expert software. The accuracy of the models in predicting the response was tested by comparing with the experimental value of response and the two values were in good agreement. The optimization of the models gave CO2 permeance of 19.23 × 10−7 mol/m2 s Pa and CO2/H2 separation selectivity of 11.6 at 5% CO2 in the feed, a pressure difference of 100 kPa, and temperature of 30 °C for Ba-SAPO-34 zeolite membrane.
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Wang, Bin, Nana Wang, Xuewen Li, Rongfei Zhou et Weihong Xing. « Exfoliation of lamellar SAPO-34 zeolite to nanosheets and synthesis of thin SAPO-34 membranes by a nanosheet-seeded secondary growth approach ». Journal of Membrane Science 645 (mars 2022) : 120177. http://dx.doi.org/10.1016/j.memsci.2021.120177.

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Ahmad, N. A., C. P. Leo, M. U. M. Junaidi et A. L. Ahmad. « PVDF/PBI membrane incorporated with SAPO-34 zeolite for membrane gas absorption ». Journal of the Taiwan Institute of Chemical Engineers 63 (juin 2016) : 143–50. http://dx.doi.org/10.1016/j.jtice.2016.02.023.

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Wang, Mingquan, Meng Li, Na Chang, Liyue Gao, Mengxin Wang et Yanfeng Zhang. « Vapor separation of methanol-dimethyl carbonate mixture on SAPO-34 zeolite membrane ». Journal of Membrane Science 565 (novembre 2018) : 311–21. http://dx.doi.org/10.1016/j.memsci.2018.08.041.

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