Relevant bibliographies by topics / High silica LTA zeolite

Academic literature on the topic 'High silica LTA zeolite'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "High silica LTA zeolite"

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Liu, Hanbang, Danhua Yuan, Guangye Liu, Jiacheng Xing, Zhongmin Liu, and Yunpeng Xu. "Oxygen-selective adsorption on high-silica LTA zeolite." Chemical Communications 56, no. 75 (2020): 11130–33. http://dx.doi.org/10.1039/d0cc04484a.

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Sharma, Pankaj, Moon Hee Han, and Churl-Hee Cho. "Synthesis of Zeolite Nanomolecular Sieves of Different Si/Al Ratios." Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/912575.

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Nanosized zeolite molecular sieves of different Si/Al ratios have been prepared using microwave hydrothermal reactor (MHR) for their greater application in separation and catalytic science. The as-synthesized molecular sieves belong to four different type zeolite families: MFI (infinite and high silica), FAU (moderate silica), LTA (low silica and high alumina), and AFI (alumina rich and silica-free). The phase purity of molecular sieves has been assessed by X-ray diffraction (XRD) analysis and morphological evaluation done by electron microscopy. Broad XRD peaks reveal that each zeolite molecular sieve sample is composed of nanocrystallites. Scanning electron microscopic images feature the notion that the incorporation of aluminum to MFI zeolite synthesis results in morphological change. The crystals of pure silica MFI zeolite (silicalite-1) have hexagon lump/disk-like shape, whereas MFI zeolite particles with Si/Al molar ratios 250 and 100 have distorted hexagonal lump/disk and pseudo spherical shapes, respectively. Furthermore, phase pure zeolite nanocrystals of octahedron (FAU), cubic (LTA), and rod (AFI) shape have been synthesized. The average sizes of MFI, FAU, LTA, and AFI zeolite crystals are 250, 150, 50, and 3000 nm, respectively. Although the length of AFI zeolite rods is in micron scale, the thickness and width are of a few nanometers.
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Beving, Derek E., Cory R. O’Neill, and Yushan Yan. "Hydrophilic and antimicrobial low-silica-zeolite LTA and high-silica-zeolite MFI hybrid coatings on aluminum alloys." Microporous and Mesoporous Materials 108, no. 1-3 (February 2008): 77–85. http://dx.doi.org/10.1016/j.micromeso.2007.03.029.

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Gao, Feng. "Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts." Catalysts 10, no. 11 (November 14, 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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Santamaría-Pérez, David, Tomas Marqueño, Simon MacLeod, Javier Ruiz-Fuertes, Dominik Daisenberger, Raquel Chuliá-Jordan, Daniel Errandonea, et al. "Structural Evolution of CO2-Filled Pure Silica LTA Zeolite under High-Pressure High-Temperature Conditions." Chemistry of Materials 29, no. 10 (May 10, 2017): 4502–10. http://dx.doi.org/10.1021/acs.chemmater.7b01158.

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Ryu, Taekyung, Yonjoo Kang, In-Sik Nam, and Suk Bong Hong. "Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts." Reaction Chemistry & Engineering 4, no. 6 (2019): 1050–58. http://dx.doi.org/10.1039/c9re00007k.

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Ryzhikov, Andrey, Laura Ronchi, Habiba Nouali, T. Jean Daou, Jean-Louis Paillaud, and Joël Patarin. "High-Pressure Intrusion–Extrusion of Water and Electrolyte Solutions in Pure-Silica LTA Zeolite." Journal of Physical Chemistry C 119, no. 51 (December 15, 2015): 28319–25. http://dx.doi.org/10.1021/acs.jpcc.5b09861.

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Oonkhanond, Bovornlak, and Michael E. Mullins. "The effect of composition on the growth and morphology of zeolite A in solution." Journal of Materials Research 19, no. 6 (June 2004): 1613–22. http://dx.doi.org/10.1557/jmr.2004.0238.

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The zeolite LTA (Linde type A) framework is composed of an equal amount of silica and alumina arranged in a three-dimension tetrahedral structure. This high alumina content zeolite possesses a strong negative surface charge in a basic solution due to the substitution of aluminum atoms into a SiO4 tetrahedral structure making it difficult to form a continuous layer in solution. Synthesis parameters such as synthesis duration, chemical composition, and synthesis temperature were varied. The crystallization kinetics was carried out using the particle size measurement, percent crystallinity from x-ray diffraction analysis, infrared absorption of tetrahedra using attenuated total reflectance Fourier transform infrared spectroscopy, and the exponential growth model. The results showed that the zeolite A crystallization in a solution depends on the chemical kinetics of the zeolite formation, surface charge of the substrate, and the mass transfer in the solution.
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Lemishko, Tetiana, Susana Valencia, Fernando Rey, Mónica Jiménez-Ruiz, and German Sastre. "Inelastic Neutron Scattering Study on the Location of Brønsted Acid Sites in High Silica LTA Zeolite." Journal of Physical Chemistry C 120, no. 43 (October 24, 2016): 24904–9. http://dx.doi.org/10.1021/acs.jpcc.6b09012.

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Ryu, Taekyung, Nak Ho Ahn, Seungwan Seo, Jung Cho, Hyojun Kim, Donghui Jo, Gi Tae Park, et al. "Fully Copper-Exchanged High-Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH3-SCR Catalysts." Angewandte Chemie International Edition 56, no. 12 (January 18, 2017): 3256–60. http://dx.doi.org/10.1002/anie.201610547.

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Dissertations / Theses on the topic "High silica LTA zeolite"

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Cheng, Chil-Hung. "High-silica zeolite nucleation from clear solutions." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3273.

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Understanding the mechanism of zeolite nucleation and crystallization will enable the zeolite science community to tune zeolite properties during synthesis in order to accommodate the purposes of various applications. Thus there has been considerable research effort in "deciphering" the mechanism by studying the growth course of tetrapropylammonium (TPA)-mediated silicalite-1 using several techniques, such as dynamic light scattering (DLS), small-angle X-ray/neutron scattering (SAXS/SANS), and nuclear magnetic resonance (NMR). While these studies have generated a more comprehensive picture on the silicalite-1 growth mechanism, the general application of the mechanism and how it could be applied to other zeolite systems have not been addressed. This work initially tried to apply the insights developed from the TPAsilicalite- 1 clear solution synthesis by investigating the nanoparticles formation and zeolite growth in several tetraethyl orthosilicate (TEOS)-organocation-water solutions heated at 368 K using SAXS. The results are in contrast to TEOS-TPAOH-water mixtures that rapidly form silicalite-1 at 368 K. These results imply that the developed TPA-silicalite-1 nucleation and crystallization mechanism is not universally applicable to other zeolite systems and TPA-silicalite-1 itself could be a special case. With this in mind, the next goal of this work uses in situ SAXS to revisit silicalite-1 growth kinetics prepared by using several TPA-mimic organocations and some asymmetric geometry organocations. The results clearly show the TPA cation is an extraordinarily efficient structure-directing agent (SDA) due to its moderate hydrophobicity and perfect symmetric geometry. Any perturbation of the hydrophobicity and symmetry of SDA leads to a deterioration of zeolite growth. This work further investigates the influences of alcohol identity and content on silicalite-1 growth from clear solutions at 368 K using in situ SAXS. Several tetraalkyl orthosilicates (Si(OR)4, R = Me, Pr, and Bu) are used as the alternative silica sources to TEOS in synthesizing silicalite-1. Increasing the alcohol identity hydrophobicity or lowering the alcohol content enhances silicalite-1 growth kinetics. This implies that the alcohol identity and content do affect the strength of 1) hydrophobic hydration of the SDA and 2) the water-alcohol interaction, through changing the efficiency of the interchanges between clathrated water molecules and solvated silicate species.
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Gordon, James William. "Ester hydrolysis by high silica zeolites." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/13936.

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Sinclair, D. M. "Crystallization of high silica molecular sieves." Thesis, University of Edinburgh, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384262.

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Chihara, Kazuyuki, Kenta Saito, Hidenori Nakamura, and Yosuke Kaneko. "Diffusion measurement of chlorinated hydrocarbons into high-silica zeolite by chromatographic method: Diffusion measurement of chlorinated hydrocarbonsinto high-silica zeolite by chromatographic method." Diffusion fundamentals 6 (2007) 58, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A14237.

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Chihara, Kazuyuki, Kenta Saito, Hidenori Nakamura, and Yosuke Kaneko. "Diffusion measurement of chlorinated hydrocarbons into high-silica zeolite by chromatographic method." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193946.

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Rozhkovskaya, Alexandra. "Synthesis of high quality zeolite from alum sludge for water treatment applications." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/212529/1/Alexandra_Rozhkovskaya_Thesis.pdf.

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Conventional drinking water treatment plants generate large volume of wastes, such as alum sludge, which is associated with environmental liability and adds to the cost of water purification. Hence, there is a crucial need to develop an alternative “green” strategy of alum sludge reuse. This thesis is the first comprehensive investigation of alum sludge recycling by conversion into high value product, LTA zeolite, and its successful application in water treatment industry for hardness removal. This pathway effectively contributes to the improvement of waste management and more sustainable water treatment operations as a crucial component of circular economy.
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Chihara, Kazuyuki, Takashi Matsumoto, and Kazunori Hijikata. "Azeotropic adsorption of organic solvent vapor mixture on high silica zeolite, mass transfer dynamics." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194773.

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Chihara, Kazuyuki, Yuki Teramura, Shinji Tomita, and Kenta Saito. "Diffusion of chlorinated hydrocarbons in high silica zeolite - comparison between chromatographic data and molecular dynamic simulation." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-189478.

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Chihara, Kazuyuki, Yuki Teramura, Shinji Tomita, and Kenta Saito. "Diffusion of chlorinated hydrocarbons in high silica zeolite - comparison between chromatographic data and molecular dynamic simulation." Diffusion fundamentals 11 (2009) 24, S. 1-2, 2009. https://ul.qucosa.de/id/qucosa%3A13965.

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Chihara, Kazuyuki, Takashi Matsumoto, and Kazunori Hijikata. "Azeotropic adsorption of organic solvent vapor mixture on high silica zeolite, mass transfer dynamics: Azeotropic adsorption of organic solvent vapor mixture on high silicazeolite, mass transfer dynamics." Diffusion fundamentals 3 (2005) 15, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14303.

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Books on the topic "High silica LTA zeolite"

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Knappe, Detlef R. U. Removal of MIB and geosmin by high-silica zeolites and zeolite-enhanced ozonation. Denver, Colo: Water Research Foundation, 2010.

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Book chapters on the topic "High silica LTA zeolite"

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Takeuchi, Yasushi, Norio Miyata, Hirokazu Isozaki, and Seiichi Asano. "Removal and Recovery of a Substitute for Chlorofluorocarbon by High Silica Zeolite." In The Kluwer International Series in Engineering and Computer Science, 929–36. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_116.

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Juan, Liang. "High Silica Zeolite as Heterogeneous Catalyst." In Studies in Surface Science and Catalysis, 611–22. Elsevier, 1985. http://dx.doi.org/10.1016/s0167-2991(08)65333-1.

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Furuya, Eiji, Noriyoshi Watanabe, Seiichi Asano, Masashi Harada, and Satoru Morishita. "Adsorption of Organics onto High Silica Zeolite." In Studies in Surface Science and Catalysis, 193–200. Elsevier, 1993. http://dx.doi.org/10.1016/s0167-2991(08)63515-6.

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Beving, D., C. O'Neill, and Y. S. Yan. "Corrosion resistant high-silica-zeolite MFI coatings." In From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference, Proceedings of the 15th International Zeolite Conference, 1629–34. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)81040-8.

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Takahashi, Takeshige, Mayumi Nakanishi, and Takami Kai. "Regeneration of high silica zeolite used for Beckmann rearrangement." In New Developments and Application in Chemical Reaction Engineering, 193–96. Elsevier, 2006. http://dx.doi.org/10.1016/s0167-2991(06)81566-1.

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Vtjurina, L. M., S. S. Khvoshchev, and I. V. Karetina. "02-P-42 - Synthesis of high-silica MWW zeolite." In Studies in Surface Science and Catalysis, 197. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81381-1.

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Chihara, K., T. Terakado, T. Ninomiya, and H. Mizuochi. "Chromatographic adsorption measurement of chlorinated organics on high silica zeolite." In Recent Advances in the Science and Technology of Zeolites and Related Materials Part B, Proceedings of the 14th International Zeolite Conference, 1991–98. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)80738-9.

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Ichihashi, Hiroshi. "10 Vapor phase beckmann rearrangement over a high silica MFI zeolite." In Science and Technology in Catalysis 2002, Proceedings of the Fourth Tokyo conference on Advance Catalytic Science and Technology, 73–78. Elsevier, 2003. http://dx.doi.org/10.1016/s0167-2991(03)80167-2.

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KUMAR, R., K. RAMESH REDDY, ANUJ RAJ, and P. RATNASAMY. "SYNTHESIS AND CHARACTERISATION OF A NEW HIGH-SILICA, LARGE-PORE ALUMINOSILICATE ZEOLITE, NCL-1." In Proceedings from the Ninth International Zeolite Conference, 189–96. Elsevier, 1993. http://dx.doi.org/10.1016/b978-1-4832-8383-8.50021-0.

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TAKAHASHI, T., T. KAI, and M. NISHI. "BECKMANN REARRANGEMENT OF CYCLOHEXANONE OXIME OVER HIGH SILICA HZSM-5 ZEOLITES MODIFIED WITH BORIA." In Proceedings from the Ninth International Zeolite Conference, 509–16. Elsevier, 1993. http://dx.doi.org/10.1016/b978-1-4832-8383-8.50145-8.

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Conference papers on the topic "High silica LTA zeolite"

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""High-Performance Concrete Incorporating Zeolite, Fly Ash and Silica Fume"." In "SP-172: High-Performance Concrete - Proceedings: ACI International Conference, Malaysia 1997". American Concrete Institute, 1999. http://dx.doi.org/10.14359/6172.

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Ayad, Zahraa, Hussein Q. Hussein, and Ban A. Al-Tabbakh. "Synthesis and characterization of high silica HY zeolite by basicity reduction." In 2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000278.

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CHIHARA, KAZUUKI, KAZUNORI HIJIKATA, HIDEAKI YAMAGUCHI, HIROYUKI SUZUKI, and YASUSHI TAKEUCHI. "AZEOTROPIC ADSORPTION OF ORGANIC SOLVENT VAPOR MIXTURE ON HIGH SILICA ZEOLITE, EXPERIMENTAL & SIMULATION." In Proceedings of the Third Pacific Basin Conference. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704320_0093.

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Dvorkin, Leonid I., Vadim Zhitkovsky, Nataliya Lushnikova, and Mohammed Sonebi. "Comparative Study of Metakaolin and Zeolite Tuff Influence on Properties of High-Strength Concrete." In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.179.

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Composite admixtures which include active pozzolanic components and high-range water reducers, allows to obtain high-strength, particularly dense and durable concrete to achieve a reduction in resources and energy consumption of manufacturing.Zeolite, containing a significant amount of active silica, can serve as one of the alternative substances to resources and energy consuming mineral admixtures like metakaolin and silica fume. The deposits of zeolites are developed in Transcarpathia (Ukraine), USA, Japan, New Zealand, Iceland and other countries. It is known that zeolite tuffs exhibit pozzolanic properties and are capable to substitution reactions with calcium hydroxide.However, the high dispersion of zeolite rocks leads to a significant increase in the water consumption of concrete. Simultaneous introduction of zeolite tuffs with superplasticizers, which significantly reduce the water content, creates the preconditions for their effective use in high-strength concrete.Along with dehydrated (calcined) zeolite, natural (non-calcined) zeolite expresses itself as an effective mineral admixture of concrete. When using non-calcined zeolite, the effect of increasing in compressive strength at the age of 3 and 7 days is close to the effect obtained when using dehydrated zeolite: 8-10% and 10- 12%, respectively, and 28 days the strength growth is 13-22%. The use of non-calcined zeolite has a significant economic feasibility, so it certainly deserves attention. There were compared the effect of zeolite to metakaolinThe results of the research indicate that the use of composite admixtures, consisted of calcined (non-calcined) zeolite tuff of high dispersity and superplasticizer of naphthalene formaldehyde type, allows to obtain concretes classes C50…C65.
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Yamamoto, T., T. Sato, Y. Seino, K. Hattori, S. Kuroki, and T. Kikkawa. "Layered Low-k Porous Silica Zeolite Films for Inter-Metal Dielectric with High Elastic Modulus." In 2012 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2012. http://dx.doi.org/10.7567/ssdm.2012.ps-2-9.

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Watcharasing, Sunisa, Chularat Wattanakit, Saros Salakhum, Anittha Prasertsab, and Prapoj Kiattikomol. "Synthesis of Zeolites from Production Sand Waste: The Circular Model for Oil and Gas Exploration and Production." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31420-ms.

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Abstract This project aims to convert production sand waste from oil & gas exploration & production process to be high value silica-based product, Zeolites, and explore opportunities to lower amount of sand waste disposal to landfill. This is one key item in Circular Model for Oil & Gas Exploration & Production. Zeolites is a microporous crystalline aluminosilicate material, which possess a superior characteristic in terms of high surface area. Therefore, it is widely utilized in many industries such as adsorbent, ion exchange, and catalysts in oil refining and petrochemical industry. In this work, various types of zeolites were synthesized from PTTEP production sand waste, to prove concept of turning sand waste to high value-added product, called zeolite. In normal operation, sand waste was sent to dispose as landfill about 50 Ton/annual. To synthesize zeolite from sand waste, there are three main steps, which are 1) Sand Pretreatment, 2) Silica Extraction, and 3) Zeolite Synthesis. Firstly, sand waste from petroleum production were pretreated by water and acid washing. Then, nanosilica was extracted out from pretreated sand by boiling the pretreated sand in NaOH solution at temperature 150 C for 4 hrs, then precipitate them to get the nanosilica substances. It was further used as a reactant source for zeolite synthesis. In the last step, the extracted silica was reacted with Structure Directing Agent (SDA); zeolite template, under optimal condition of hydrothermal treatment process to obtain zeolites product. Zeolites synthesis from production sand waste was firstly initiated and successfully achieved in lab phase, to prove of concept for extracting silica source as a substance for zeolite synthesis. Various types of zeolites (Silicalite-1, ZSM-5, Faujasite (FAU), Mordenite, and Zeolite A) can be synthesized from PTTEP sand waste with synthesis yield 80%, 68%, 85%, 40%, and 81%, respectively. This indicates that silica source from production sand waste can be utilized as a reactant source for zeolites synthesis. The next phase of prototype unit is under design phase, to allow unit can be operated more versatile, and automatically run. From this novel technology, it is expected to reduce an amount of production sand waste disposal out from separator to landfill about 50 Ton/year. The synthesized zeolites from prototype phase will be further applied in many potential applications such as an adsorbent in wastewater treatment process, as catalyst, and moisture adsorbent in oil & gas dehydration unit. New findings and requirements discovered during the prototype test will be used to iteratively optimize and improve the design of the sand to zeolites process for future industrial-scale implementation.
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Ng, P. L., J. J. Chen, and A. K. H. Kwan. "Triple Blending with Superfine Natural Zeolite and Condensed Silica Fume to Improve Performance of Cement Paste." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.037.

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Superfine natural zeolite (SNZ) is obtained by grinding natural zeolite to micro-fine size, whereas condensed silica fume (CSF) is by-product of ferrosilicon industry. Both SNZ and CSF are environmentally-friendly supplementary cementitious materials for mortar and concrete production. Owing to the high fineness and favourable grading of SNZ and CSF (the median particle sizes were 4 μm and 0.4 μm, respectively), the addition of SNZ and CSF could successively fill the voids between ordinary Portland cement (OPC) grains and increase the packing density of the binder, so as to reduce the volume of voids to be filled with water. Therefore, triple blending of OPC+SNZ+CSF can benefit the overall performance of cement paste by releasing more water for flowability improvement at the same water/binder (W/B) ratio, or adopting a lower W/B ratio for strength improvement at the same flowability requirement. This study evaluated the effects of adding SNZ and CSF on the packing density and water film thickness of binder. The experimental results proved that triple blending with SNZ and CSF could increase the packing density and improve the flowability and cohesiveness of cementitious paste.
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Armandi, Marco, Barbara Bonelli, and Edoardo Garrone. "Synthesis and Characterization of Mesoporous and Microporous Carbons With Potential Applications as Hydrogen Storage Media." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95740.

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The preparation and physico-chemical characterization of mesoporous and microporous carbons, obtained via a casting procedure, from a SBA-15 silica and a commercial Na-Y zeolite, is reported. XRD spectra showed that ordered carbon replicas occur in all cases. Micro-Raman spectra showed that rather homogeneous powders are obtained, exhibiting the presence of a graphitized carbon phase of small imperfect graphene sheets, typical of sp2 C, along with an amorphous one, notwithstanding the relatively low temperature adopted during the carbonization processes (1173 K). N2 adsorption isotherms at 77 K allowed the determination of BET surface areas and pore volumes: on account of the high porosity and the low specific weight, with respect to zeolites, for example, these carbon materials could be promising media for hydrogen storage. They could be used as such, or after convenient functionalization or metal doping.
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Watcharasing, Sunisa, Chularat Wattanakit, Anawat Thivasasith, and Prapoj Kiattikomol. "Circular Model for E&P: Production Sand Conversion to Nanosilica and Hierarchical Zeolites." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210667-ms.

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Abstract As part of circular model for E&P, production sand waste from oil production process will be converted to new high value-added product, called "Nanosilica", and "Hierarchical Zeolites". This is beneficial in terms of lower amount of production sand waste disposal to landfill. There are three main steps for sand conversion to nanosilica and hierarchical zeolites which compose of1) Sand Pre-treatment, 2) Nanosilica Extraction, and 3) Hierarchical Zeolite Synthesis. In the first step of Sand Pre-treatment process, production sand was pretreated by using water and acid washing 3M HCl, follow by calcination. Secondly, pretreated sand will be extracted to obtain nanosilica by boiling pretreated sand with 3M NaOH solution to get sodium silicate, and finally adding HCl to precipitate nanosilica. Finally, the extracted nanosilica will be further reacted with Structure Directing Agent (SDA); zeolite template, under hydrothermal treatment process for crystallization of Hierarchical Zeolites. Nanosilica extracted from production sand contain high specific surface area around 200 – 600 m2/g, with small particle size less than 50 nm. Nanosilica can be applied in many applications such as Gas separation, Adsorption, Catalysis, Ion-exchange, and Detergent. Hierarchical Zeolites with nanosheets morphology obtain many niche characteristics to overcome the limitation of conventional zeolites in terms of, 1) good mass transportation through active sites due to their microporous structure improvement, 2) high surface area, and 3) longer catalyst lifetime. Hierarchical Zeolites is popularly used in wide range of applications such as separation, ion-exchange to catalysis. Two most popular Hierarchical Zeolites nanosheet ZSM-5, and Faujasite (FAU) topologies have been developed in this work. The physicochemical properties were compared with the one synthesized using the commercial chemical grade of silica sources. The results show that the nanosilica from production sand can be achievable for Hierarchical Zeolites synthesis, by comparing the physicochemical properties such as surface area, porosity, topology, and textural properties with the one obtained using the commercial silica sources. Hierarchical zeolites from production sand waste are initiated in PTTEP as part of Circular Model for E&P. The synthesized hierarchical zeolites from this project will be further possibly applied in-house in PTTEP as the moisture adsorbent in instrument air, or moisture in condensate. This would help company for reduce OPEX cost. From these preliminary findings, all information will be further applied to the process design of in prototype, and scale-up phase.
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Watcharasing, Sunisa, Chularat Wattanakit, Anawat Thivasasith, and Prapoj Kiattikomol. "Hierarchical Zeolites from Production Sand Waste as Catalysts for CO2 to Carbon Nanotubes CNTs: Exploration and Production Sustainability." In IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209923-ms.

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Abstract This project targets to convert sand waste from oil & gas production, which is typically disposed as landfill, to be the higher-value products, called "Hierarchical Zeolites". This project also explores opportunities to lower amount of sand waste to landfill and try to convert CO2 to CNTs, as part of Sustainable Development Goals. Hierarchical Zeolites is developed with nanosheets morphology to overcome limitation of conventional zeolites in terms of, 1) microporous structure improvement to enhance the mass transport through active sites, 2) longer catalyst lifetime, and 3) higher surface area. With these superior characteristics, it is popularly used in wide range of applications ranging from adsorption, separation, and ion-exchange to catalysis. In this work, the Hierarchical Zeolites are utilized as catalysts for CO2 conversion to CNTs, which is the futuristic materials. Methods, The procedure to produce hierarchical zeolites with nanosheet morphology for ZSM-5, and Faujasite (FAU) topologies have been developed. Production sand waste is used as a silica source; after it is passed sand pretreatment and silica extraction steps, for hierarchical zeolites synthesis, to reduce their production cost. Physicochemical properties of the synthesized hierarchical zeolites are analyzed, such as surface area, porosity, topology, and textural properties. These physicochemical properties will be compared with the one obtained using the commercial silica sources. Then, the developed Hierarchical zeolites are applied as catalyst for CNTs production from CO2. The fixed bed Chemical Vapor Deposition (CVD) technique is introduced for CNTs synthesis, as its low energy cost consumption, high quality of CNTs synthesis. The physical properties of CNTs, including tube diameter, graphitic structure (ID/IG). To prove of concept for extracting silica source as a substance for hierarchical zeolite synthesis and use as catalyst for CNTs production from CO2. Two types of hierarchical zeolites nanosheet (ZSM-5, and FAU) have been successfully synthesized from nano silica obtained froms and waste, with high yield more than 75%. The hierarchical-FAU, and hierarchical -FAU-5's performance on CNTs production from CO2 are compared together. It was found that the hierarchical-FAU provide the best catalyst for CNT production with the CNTs yield of 28.9%, the average diameter of 22.8 nm and ID/IGof 0.68. The optimal condition for hierarchical zeolites synthesis will be further applied in the prototype phase, in the 50X up-scaling. This technology is expected to lower an amount of production sand waste disposal to landfill. Moreover, the synthesized hierarchical zeolites will be further explored in other advanced reactions apart from CNTs synthesis, such as catalytic cracking. Hierarchical zeolites from production sand waste are firstly initiated and successfully achieved in PTTEP. From these findings, information will be applied to the process design of Hierarchical zeolites synthesis in prototype, and scale-up phase.
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