Relevant bibliographies by topics / Zsm-5

Academic literature on the topic 'Zsm-5'

Author: Grafiati
Published: 4 June 2021
Last updated: 22 June 2024

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Journal articles on the topic "Zsm-5"

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Desmurs, Lucie, Claudia Cammarano, Olinda Gimello, Anne Galarneau, and Vasile Hulea. "Influence of the Mesoporosity of Hierarchical ZSM-5 in Toluene Alkylation by Methanol." Materials 16, no. 21 (October 26, 2023): 6872. http://dx.doi.org/10.3390/ma16216872.

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Among the different strategies to design highly shape-selective ZSM-5 to obtain para-xylene through toluene alkylation with methanol, the introduction of mesopores to increase reactant and product diffusion has been proposed but barely studied. In this study, we prepared mesoporous ZSM-5 catalysts, named ZSM5-MT(x), from commercial ZSM-5 (Si/Al = 15), using a two-step micelle-templating procedure with octadecyltrimethylammonium bromide as a surfactant in basic medium (x = NaOH/Si). These materials were used as catalysts for the alkylation of toluene by methanol at a low contact time to avoid thermodynamic equilibrium of the xylene isomers. Compared to the parent ZSM-5, the mesoporous ZSM5-MT(x) catalysts did not improve the para-xylene selectivity, revealing that the strategy of increasing diffusion in the catalyst is not a good strategy to follow. However, ZSM5-MT(0.5) showed less deactivation on stream than the parent ZSM-5. Therefore, introducing mesopores to ZSM-5 could be interesting to explore, combined with another strategy of shape selectivity, such as the passivation of the external surface acidity.
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Nurdin, Ali, Hens Saputra, Arfiana Arfiana, Retno Yunilawati, and Era Restu Finalis. "PEMBUATAN DAN KARAKTERISASI KATALIS ZEOLIT ZSM-5 UNTUK KONVERSI BIOETANOL MENJADI BIOETILENA." Majalah Ilmiah Pengkajian Industri 12, no. 2 (October 19, 2018): 79–84. http://dx.doi.org/10.29122/mipi.v12i2.2741.

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Etilen sebagai produk petrokimia yang penting dapat dibuat dari bioetanol menggunakan katalis ZSM5. Zeolit sintetis ZSM5 dapat dibuat menggunakan zeolit alam yang banyak tersedia di Indonesia. Proses pembuatan ZSM5 menggunakan metode hidrotermal pada temperatur 180°C selama 24 jam. Sebagai agen pengarah terbentuknya struktur ZSM-5 tersebut digunakan template TPABr (Tetra Prophyl Ammonium Bromide). Kalsinasi produk ZSM5 dilakukan pada temperatur 600°C selama 1 jam. Karakterisasi ZSM-5 yang dilakukan antara lain analisis struktur dan kristalinitas, observasi morfologi permukaan menggunakan metode Difraksi Sinar X, Scanning Electron Microscopy, dan physisorption untuk mempelajari sifat pori. Hasil penelitian menunjukkan bahwa dihasilkannya ZSM-5 dengan kristalinitas sekitar 110 %. Kristal ZSM-5 yang dihasilkan berbentuk kubus dengan luas permukaan spesifik BET 300 m2/g, volume pori sekitar 0,13 Cm3/g. Distribusi ukuran pori yang sempit mengindikasikan ukuran pori yang seragam dengan ukuran rata-rata 0.55 nm.
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L, Liu. "The Application of Mesoporous ZSM-5 Zeolite in the ULSD Catalysts." Petroleum & Petrochemical Engineering Journal 4, no. 4 (2020): 1–3. http://dx.doi.org/10.23880/ppej-16000236.

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The mesoporous ZSM-5 zeolite containing MoCoP/Al2O3 catalyst (C12-ZSM5) with the mixture of Al2O3 and mesoporous ZSM- 5 zeolite as carrier was synthesized. The catalytic performance of C12-ZSM5 catalyst was evaluated by the hydrodesulfurization (HDS) of different diesel feedstock. The carriers and catalysts were characterized by N2 adsorption-desorption, pyridine-FTIR, X-ray diffraction (XRD) and CO in-situ FTIR (CO-FTIR) techniques. Results showed that mesoporous ZSM-5 can improve the acidity of the catalyst and increase the number of MoCoS active phases. The C12-ZSM5 catalyst had low HDS and HDN activity, because the acidic sites of mesoporous ZSM-5 were easily occupied by nitrogen compounds. The HDS activity of C12-ZSM5 catalyst was fully exploited by using graded packing technology, the sulfur content of product oil was 5.9 ng/μL. The relative HDS activity of C12-ZSM5 catalyst is 1.47 times that of FHUDS-8 catalyst.
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Mohd Yusof, Alias, Nur Nadira Sulaiman, and Hadi Nur. "Synthesis and Characterizations of Metal Oxide-Sulfonic Acid Functionalized ZSM-5 for Photocatalytic Degradation and Adsorption of Dimethylarsenic Acid." Applied Mechanics and Materials 699 (November 2014): 994–99. http://dx.doi.org/10.4028/www.scientific.net/amm.699.994.

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TiO2 and ZnO were incorporated into ZSM-5 using titanium tetrachloride and zinc nitrate as the precursors respectively. The functional group of ZSM-5 was further modified using mercaptopropyl trimethoxysilane (MPTS). This method was used to produce a two-in-one composite namely TiO2-ZSM5-SH and ZnO-ZSM5-SH which holds the abilities to degrade organic pollutants as well as to remove them from the environment. Determination of the composition and morphology of all synthesized catalyst complexes were characterized using Fourier Transformed Infrared (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HR-TEM). Results obtained indicated that the average diameters for TiO2-ZSM5-SH particles are 2.398 μm, slightly larger than the diameter of ZnO-ZSM5-SH particles with an average of 1.8067 μm. Both TiO2-ZSM5-SH and ZnO-ZSM5-SH appeared as sphere-like shape and amorphous since both metal oxides were incorporated into the ZSM-5 pores. The compositions of these complexes were proven by the presence of a strong silica absorption band showing the existence of Si-O stretching vibrations and SiO2 asymmetric vibrations in the synthesized complexes. For TiO2-ZSM5-SH, the Ti-O stretching vibration can be seen at 3467.29 cm-1 and at 1637.86 cm-1 while Zn-O absorption band appeared at 455.52 cm-1 in ZnO-ZSM5-SH. The symmetric and asymmetric vibrations of –CH2 and –CH3 indicate the existence of alkyl groups in the ZSM-5. The ability of catalyst complexes synthesized as photocatalyst were applied and tested on the photodegradation of dimethylarsenic acid (DMA) under ultra violet (UV) radiation which showed that these catalyst complexes are proven be able to degrade DMA into less toxic intermediates and are able to adsorb the remaining arsenic species from the aqueous solutions.
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Park, Seung-Kyu, Hosun Choo, and Larry Kevan. "Nitromethane decomposition over Cu-ZSM-5 and Co-ZSM-5." Physical Chemistry Chemical Physics 3, no. 15 (2001): 3247–53. http://dx.doi.org/10.1039/b008117p.

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Al-Thawabeia, Ruba A., and Hamdallah A. Hodali. "Use of Zeolite ZSM-5 for Loading and Release of 5-Fluorouracil." Journal of Chemistry 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/403597.

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Samples of zeolite ZSM-5 have been synthesized in both the sodium form (ZSM-5) and the acid activated form (H-ZSM-5). In addition, each of these two forms was prepared in the two molar SiO2/Al2O3ratios of 169 and 15. All samples of these ZSM-5 derivatives were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms, thermal gravimetric analysis (TGA), X-ray fluorescence (XRF), and scanning electron microscopy (SEM). The samples were successfully loaded with the anticancer drug 5-fluorouracil (5-FU) with loading capacities varying from 22% (for the sodium form having the lower molar SiO2/Al2O3ratio of 15, ZSM-5-(15)) to 43% (for the corresponding acid form, H-ZSM-5-(15)). Percent release of the drug-loaded ZSM-5 samples into simulated body fluid (SBF) was measured at pH 7.4 and 37°C. The results showed a slight variation in the % release within the range 84–93%, while the first-order rate constant (k) varied from 2.2 h−1for ZSM-5-(15) to 3.9 h−1for H-ZSM-5-(15). It was interesting to note that at the higher molar SiO2/Al2O3ratios of 169, both the sodium form, ZSM-5-(169), and the acid form, H-ZSM-5-(169), exhibit an intermediate efficiency in either % loading (38%) or first-order kinetic release constant (k= 2.9 h−1).
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Ghrib, Yosra, Najoua Frini-Srasra, Ezzeddine Srasra, Joaquín Martínez-Triguero, and Avelino Corma. "Synthesis of cocrystallized USY/ZSM-5 zeolites from kaolin and its use as fluid catalytic cracking catalysts." Catalysis Science & Technology 8, no. 3 (2018): 716–25. http://dx.doi.org/10.1039/c7cy01477e.

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Pohan, Maya Sari Ananda. "Sintesis Dan Karakterisasi ZSM-5." Jurnal Inovasi Ilmu Pengetahuan dan Teknologi 3, no. 1 (October 1, 2022): 50. http://dx.doi.org/10.32493/jiptek.v3i1.24713.

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Material zeolit merupakan material yang sangat banyak digunakan dalam berbagai industri. Penggunaan material zeolit tersebut dikarenakan keunikan dari sifat zeolit tersebut. ZSM-5 merupakan salah satu material zeolit yang sering digunakan. ZSM-5 disintesis dengan metode hidrotermal dan mengunakan bahan-bahan analytical grade. Metode yang digunakan dalam pembuatan ZSM-5 mengacu pada beberapa jurnal penelitian dan dirangkum pada artikel ini. Berdasarkan hasil berbagai analisis diperoleh ZSM-5 hasil sintesis yang memiliki karakter khas dari ZSM-5. Karakterisasi yang dilakukan untuk memastikan apakah yang terbentuk adalah ZSM-5 atau tidak melalui analisis XRD, analisis luas permukaan dan distribusi pori dan SEM-EDS. Hasil XRD menunjukkan puncak-puncak khas pada 2 theta, luas permukaan yang besar (334,02 m2/g), distribusi pori (1,54 nm), hasil mikrograf SEM menunjukkan morfologi berbentuk heksagonal dengan permukaan yang halus dan rasio molar Si/Al sebesar 35,18 yang diperoleh dari analisis EDS. Hasil dari analisis tersebut dibandingkan dengan ZSM-5 komersial atau yang sudah standar agar lebih dapat memastikan bahwa zeolit yang terbentuk adalah ZSM-5.
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Dyer, Andrew C., Mohamad A. Nahil, and Paul T. Williams. "Biomass:polystyrene co-pyrolysis coupled with metal-modified zeolite catalysis for liquid fuel and chemical production." Journal of Material Cycles and Waste Management 24, no. 2 (January 4, 2022): 477–90. http://dx.doi.org/10.1007/s10163-021-01334-0.

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AbstractBiomass and waste polystyrene plastic (ratio 1:1) were co-pyrolysed followed by catalysis in a two-stage fixed bed reactor system to produce upgraded bio-oils for production of liquid fuel and aromatic chemicals. The catalysts investigated were ZSM-5 impregnated with different metals, Ga, Co, Cu, Fe and Ni to determine their influence on bio-oil upgrading. The results showed that the different added metals had a different impact on the yield and composition of the product oils and gases. Deoxygenation of the bio-oils was mainly via formation of CO2 and CO via decarboxylation and decarbonylation with the Ni–ZSM-5 and Co–ZSM-5 catalysts whereas higher water yield and lower CO2 and CO was obtained with the ZSM-5, Ga–ZSM-5, Cu–ZSM-5 and Fe–ZSM-5 catalysts suggesting hydrodeoxygenation was dominant. Compared to the unmodified ZSM-5, the yield of single-ring aromatic compounds in the product oil was increased for the Co–ZSM-5, Cu–ZSM-5, Fe–ZSM-5 and Ni–ZSM-5 catalysts. However, for the Ga–ZSM-5 catalyst, single-ring aromatic compounds were reduced, but the highest yield of polycyclic aromatic hydrocarbons was produced. A higher biomass to polystyrene ratio (4:1) resulted in a markedly lower oil yield with a consequent increased yield of gas.
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Bai-Jun, LIU, ZENG Xian-Jun, WANG Hui, HUANG Yong, and WANG Mei. "Crystal Transformation among ZSM-5, ZSM-57 andMordenite." Acta Physico-Chimica Sinica 23, no. 04 (2007): 503–7. http://dx.doi.org/10.3866/pku.whxb20070410.

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Dissertations / Theses on the topic "Zsm-5"

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Duman, Isa. "Coke characterization on HZSM-5, Fe/ZSM-5, Ni/ZSM-5, and Fe-Ni/ZSM-5 from Catalytic Fast Pyrolysis of Biomass." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226910.

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The combustion of fossil fuels has for a long time been a problem from an environmental and sustainability point of view, especially when it comes to the emissions of atmospheric carbon dioxide. The environmental concern has for instance shifted the attention towards finding new sustainable alternatives for producing chemicals and fuels, as a substitute to today’s dependence on fossil based crude oil. Catalytic Fast Pyrolysis of biomass is an excellent way to produce valuable chemicals and fuels using renewable resources. However, the process has some drawbacks, for example rapid deactivation of catalysts due to coke formation. Little is known about the characteristics of the formation of catalytic coke from pyrolysis processes, which should be a vital concern in future industrial processes. This thesis is dedicated to investigate the chemical coke characteristics found on zeolitic catalysts. Four zeolites of the type ZSM-5 were chosen for this thesis to deduce any chemical differences in the coke: HZSM-5, Fe/ZSM-5, Ni/ZSM-5, and Fe-Ni/ZSM-5. The coke were characterized by TGA, GC/MS, and FTIR. The results show that Fe/ZSM-5 produced the highest amount of coke compared to the other zeolites, where HZSM-5 had the lowest amount of coke formation. The coke consisted mainly of aromatic and cyclic hydrocarbons, dominated by polycyclic aromatic hydrocarbons. The content of ketones and alcohols in the coke found on HZSM-5 was higher compared to the metal-doped zeolites, while the formation of naphthalenes was lower. The FTIR results also show that coke was mainly comprised of aromatic hydrocarbons. However, traces of alkanes and alkenes reveal that the coke may have a greater variety than the GC/MS analysis suggests. The results show interesting features when metals are introduced to the zeolitic structure, at least when it comes to coke formation. The metal-doping of zeolites certainly seems to alter the chemistry of the catalytic reactions, compared to the parent zeolite. The differences in the chemical characteristics found in the coke are certainly interesting, and it could mean that the chemistry of the bio-oil also varies depending on the metals chosen for the ZSM-5. The new properties that metals introduce to the parent catalyst may open up new possibilities in industrial catalytic processes, and allow industries to take more advantage of the great benefits that biomass has to offer.
Förbränning av fossila bränslen har under lång tid utgjort ett problem ur miljö- och hållbarhetssynpunkt, i synnerhet gällande utsläppen av koldioxid. En större miljömedvetenhet har gett upphov till sökandet efter nya råvaror för att framställa bränslen och kemikalier, utan att förlita sig på fossil råolja. Katalytisk pyrolys av biomassa är ett utmärkt sätt att framställa värdefulla kemikalier från förnybara källor. Processen står dock inför en del tekniska utmaningar, bland annat en snabb deaktivering av använda katalysatorer genom koksning. Målet med detta examensarbete är att undersöka den kemiska sammansättningen av koks, som bildats på zeolitkatalysatorerna. Mer specifikt, att försöka undersöka huruvida den kemiska sammansättningen av koks skiljer sig mellan katalysatorn HZSM-5 och metalldopad HZSM-5. Fyra katalysatorer valdes för detta examensarbete, nämligen HZSM-5, Fe/ZSM-5, Ni/ZSM-5 och Fe-Ni/ZSM-5. Kokset har analyserats genom termogravimetrisk analys (TGA), gaskromatograf kopplad med en masspektrometer (GC/MS), samt Fourier-transform-infraröd-spektroskopi (FTIR). Resultaten visar att Fe/ZSM-5 bildade en större mängd koks jämfört med de andra zeoliterna, varpå HZSM-5 hade lägst halt koks. Utöver detta bestod kokset till största del av aromatiska- och cykliska kolväten, speciellt polycykliska aromatiska kolväten. Innehållet av ketoner och alkoholer i kokset var störst för HZSM-5, medan bildandet av naftalenföreningar ökade för de metalldopade zeoliterna. FTIR-analysen gav även upphov till signaler som är signifikanta för både alkaner och alkener. Därför kan det innebära att kokset innehar en större kemisk variation än vad GC/MS-analysen påvisade. Resultaten visar intressanta egenskaper hos metallmodifierade zeoliter, i synnerhet gällande koksbildning. Det verkar som att de metalldopade zeoliterna påverkar de katalytiska reaktionerna som sker i katalysatorn, jämfört med den obehandlade katalysatorn. Skillnaderna i den kemiska sammansättningen hos kokset för de olika katalysatorerna är definitivt intressant och kan indikera att det även kan föreligga skillnader i den kemiska sammansättningen hos bio-olja, beroende på vilken metall ZSM-5 har behandlas med. De nya egenskaperna som metaller bidrar med till ZSM-5 kan öppna upp nya möjligheter i industriella katalytiska processer, vilket även kan medföra att industrier bättre kan ta tillvara på de fantastiska egenskaper biomassa innehar.
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Nada, Majid Hameed. "Greener synthesis of nanocrystalline ZSM-5." Thesis, University of Iowa, 2016. https://ir.uiowa.edu/etd/3149.

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Nanocrystalline ZSM-5 zeolite, which is a well-known catalyst used in a variety of applications in industry, environment, and medicine, can be synthesized using different methods. However, a big challenge in synthesizing nanocrsytalline ZSM-5 is the use of an organic template such as TPAOH, which is very expensive. The template is required to facilitate the growth of the nanocrsytalline ZSM-5 during the synthesis. However, to use the nanocrsytalline ZSM-5, the template has to be removed by a calcination process to open the pores and reveal the active surface of the nanocrystalline ZSM-5. The calcination process requires a high temperature for a long time to remove the organic template. Consequently, synthesizing nanocrystalline ZSM-5 by using a templated method is considered to be time, energy, and materials inefficient. In addition, the production of CO2 from the calcination process is a negative impact on the environment. Therefore, finding another method to synthesize nanocrystalline ZSM-5 without using an organic template would be beneficial. Here, nanocrystalline ZSM-5 was synthesized successfully in high yield and quality by using a seed-assisted method and without using the organic template. In addition, the effect of synthesis temperature, synthesis time, basic environment, amount of seeds, size of seeds, aging time, and use of calcined and uncalcined seeds are investigated in this study. The synthesized nanocrystalline ZSM-5 materials were characterized by using X-ray diffraction (XRD), gas adsorption isotherm (BET/BJH), and transmission electron microscopy (TEM).
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Balakrishanan, I. "Catalytic reactions over zsm-5 zeolites." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1985. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3229.

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Albahar, Mohammed. "Selective toluene disproportionation over ZSM-5 zeolite." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/selective-toluene-disproportionation-over-zsm5-zeolite(bcc7a677-3234-470f-be44-fdefa2bd7350).html.

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This research aimed at improving p-xylene selectivity in toluene disproportionation over ZSM-5 zeolite by exploring the effect of crystal size and various post synthetic modification methods. A comprehensive study of the effect of different modifications on the physicochemical properties of ZSM-5 was investigated using X-ray diffraction (XRD), pyridine adsorption, Fourier transform infra-red (FTIR), 29Si magic-angle spinning nuclear magnetic resonance (MAS NMR), BET surface area by N2 adsorption, inductively coupled plasma (ICP) and scanning electron microscopy (SEM). The catalytic performance of each catalyst was studied in a fixed bed reactor at a temperature 475 °C, WHSV 3-83 h-1 and two different pressures (1 and 10 bar). ZSM-5 zeolites with different crystal sizes (5, 50 and 100 ÂÂμm) were synthesized in house and compared with the commercially obtained ZSM-5 having a crystal size of 0.5 ÂÂμm. The increase in crystal size improved p-xylene selectivity which was attributed to the diffusion constraints imposed by the longer diffusion path lengths of large crystals. The highest p-xylene selectivity (58 %) was achieved over ZSM-5 with the largest crystal size 100 ÂÂμm at the highest WHSV 83 h-1. However, it was accompanied by a low conversion (2 wt. %). ZSM-5 with crystal size of 5 ÂÂμm delivered the best results in terms of the combination of para-selectivity (40 %) and toluene conversion (15 wt. %). The p-xylene produced in the channels of ZSM-5 can quickly isomerise to o-xylene and m-xylene on the external unselective acid sites. Different post modification methods were applied in this study in attempt to suppress the fast isomerization reaction by deactivating the external acid sites. This was achieved to some extent by depositing an inert silica layer using different silica agents, amounts and number of modification cycles and as a result p-xylene selectivity was significantly improved (84 %), especially over large crystals 5 ÂÂμm. The decrease in Brà̧nsted acidity (FTIR) suggested the success of the silylation method. Furthermore, impregnation of lanthanum and phosphorus on ZSM-5 improved p-xylene selectivity (40 %). FTIR measurements showed a drastic drop in the number of Brà̧nsted and Lewis acid sites after loading phosphorus which led to a large reduction in toluene conversion. Lanthanum impregnation had less effect on conversion and increased selectivity with decreased Brà̧nsted sites and pore volume reduction showed by N2 adsorption suggesting some pore narrowing. There are several approaches that can be considered in future to further improve p-xylene selectivity. Improving the synthesis of large crystals to balance acidity and crystal size can lead to the enhancement of p-xylene selectivity. Also, performing toluene disproportionation on optimised pre-coked ZSM-5 large crystals at high pressure can help to maintain the conversion while increasing p-xylene selectivity. Another approach would be to apply silylation modification to extruded large crystals ZSM-5.
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Aguilar-Mamani, Wilson. "Crystallization of NBA-ZSM-5 from kaolin." Doctoral thesis, Luleå tekniska universitet, Kemiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63169.

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ZSM-5 is an aluminosilicate zeolite with high Si/Al ratio with suitable properties for catalysis, ion exchange, adsorption and membrane applications. The main goal of this thesis was to study the growth of ZSM-5 zeolite crystals from inexpensive natural sources of silica and alumina, as well as n-butylamine (NBA) as a low-cost structure directing agent. The first objective of this work was to develop pathways to synthesize ZSM-5 crystals from kaolin clay or diatomaceous earth, two inexpensive natural sources of silica and alumina (Paper I). In the case of kaolin, a heat treatment was used in order to form amorphous metakaolinite. Subsequently, dealumination of the raw materials by acid leaching made it possible to reach appropriate Si/Al ratios and to reduce the amount of impurities. Finally, leached metakaolinite or diatomaceous earth was reacted with sodium hydroxide and NBA. After synthesis optimization, both sources of aluminosilicates were found to behave differently during the course of synthesis and to lead to slightly different reaction products. The final products exhibited Si/Al ratios in the range 10-20. The use of leached diatomaceous earth allowed to reach higher yield of ZSM-5 crystals within comparable synthesis times. However, low amounts of mordenite were inevitably formed as a by-product, which was related to the high calcium content of diatomaceous earth. Therefore, the rest of the thesis focused on the kaolin system. In order to study the growth mechanism of ZSM-5 from leached metakaolinite, a proper methodology to gain local compositional data by energy dispersive spectroscopy (EDS) on aluminosilicates was developed (Paper II). Zeolite A was used as a model system that could be ion-exchanged with various elements. In order to evaluate the reliability of the measurements, inductively coupled plasma-sector field mass spectrometry (ICP-SFMS) and EDS were compared. The EDS method developed in this work resulted in molar ratios very close to theoretical values and was therefore found more reliable than ICP-SFMS. Therefore, the method developed for zeolite A was applied in the rest of the thesis work to study the formation and growth of ZSM-5 crystals. The second part of this work focused on the kaolin system in order to understand the nucleation and growth processes of the ZSM-5 crystals. This system was heterogeneous, due to the formation of a gel upon heating of the synthesis mixture. First, the internal structure of the gel was investigated (Paper III). Second, a kinetic study was performed and compared with microstructural observations (Paper IV). Finally, the mechanisms leading to Al-zoning and dendritical growth of the zeolite crystals were investigated (Paper V). The characterization of the intermediate phases during the different stages of the hydrothermal synthesis were analyzed by different analytical techniques, such as inductively coupled plasma-sector field mass spectrometry (ICP-SFMS), dynamic light scattering (DLS), extreme high resolution-scanning electron microscopy (XHR-SEM), energy dispersive spectroscopy (EDS), high resolution-transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) and nitrogen gas adsorption. These investigations led to several important conclusions: 1) The walls of the gel were shown for the first time to be inhomogeneous and to possess a biphasic internal structure consisting of a mesoporous skeleton of aluminosilicate nanoparticles embedded in a silicate-rich soluble matrix of soft matter. 2) The kinetic study and microstructural evidences indicated that the early crystals were fully embedded inside the gel phase and that crystal growth was retarded, as the formation of the gel occurred simultaneously with the early growth of the crystals. Hence, nucleation and growth appeared to be solution mediated.  3) Finally, the Al zoning of the crystals was related to the biphasic internal structure of the gel, since the silicate-rich matrix was preferentially consumed first. 4) The dendrites present at the surface of the crystals during most of the growth process were shown to be caused by the presence of a web of nanoparticles, most likely originating from the mesoporous skeleton inside the gel. In the future, these findings are expected to lead to optimized synthesis pathways of catalysts with homogeneous properties and to contribute to the development of poor regions in Bolivia.
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Callahan, Jordan J. "Silver-embedded ZSM-5 Zeolites: a Reliable SERS Substrate." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342104242.

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Winstanley, Alastair W. "Characterisation and catalytic studies of ZSM-5 zeolite." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334462.

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Fergie-Woods, J. W. "NMR studies on the din zeolite ZSM-5." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304211.

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Cowley, Michele. "Conversion of n-pentenes over H-ZSM-5." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/5370.

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Bibliography: leaves 89-93.
The skeletal isomerisation of I-pentene provides the feed stock 2-methyl-2-butene and 2-methyl-I-butene for the production of tertiary amyl methyl ether (TAME), an octane booster for petrol. Benzene, toluene, xylenes and ethylbenzene (BTX+EB) are good or even better octane boosters, although the use of benzene is limited due to its carcinogenic nature. From an industrial point of view, these compounds are therefore of importance. The conversion of I-pentene over H-ZSM-5 zeolite catalyst was studied in a fixed-bed micro reactor.
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Lai, Re Gavalas George R. "Synthesis and characterization of ZSM-5 zeolite membranes /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-11102005-103556.

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Books on the topic "Zsm-5"

1

Tobin, D. Multi-technique analysis of coked Y and ZSM-5 zeolites. Manchester: UMIST, 1996.

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Courtin, Helene L. Oxidation of allyl alcohol into glycerol by hydrogen peroxideoverTI-ZSM-5. Manchester: UMIST, 1994.

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Happe, Emmanuel. Coke deposits on H-ZSM-5 zeolite after cracking ofn-Hexadecane. Manchester: UMIST, 1993.

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Masalska, Aleksandra. Katalizoatroy niklowe i rutenowo-niklowe na nośnikach zawierających zeolit ZSM-5 i tlenek glinu: Wybrane właściwości fizykochemiczne i katalityczne = Nickel catalysts and ruthenium-nickel catalysts supported on Al₂O₃+ZSM-5 : physiochemical and catalytic properties. Wrocław: Oficyna Wydawnicza Politechniki Wrocławskiej, 2010.

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S, Prakash Deepak, and United States. Environmental Protection Agency, eds. Sorption and catalytic destruction of chlorinated VOCs using fresh and dealuminated Y and ZSM-5 zeolites. [Washington, D.C.?: U.S. Environmental Protection Agency, 1996.

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Stepan, Kikta, ed. 2. Regionalʹna zustrich I͡A︡ROKZA, 4-5 z͡h︡ovtni͡a︡ 1986, Chikago, Il.-ZSA. Chikago: Vyd-vo I͡A︡ROKZA, 1986.

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Kids, Lifeway. Zst the Gospel Project for Preschool : Preschool Worship Guide - Volume 5: Prophets and Kings. Lifeway Church Resources, 2016.

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Book chapters on the topic "Zsm-5"

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Julbe, Anne, and Martin Drobek. "ZSM-5 Zeolite Membrane." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_615-1.

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Julbe, Anne, and Martin Drobek. "ZSM-5 Zeolite Membrane." In Encyclopedia of Membranes, 2069–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_615.

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Kharas, Karl C. C., Heinz J. Robota, and Abhaya Datye. "Deactivation of Cu-ZSM-5." In Environmental Catalysis, 39–52. Washington, DC: American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0552.ch004.

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Quann, R. J., and F. J. Krambeck. "Olefin Oligomerization Kinetics over ZSM-5." In Chemical Reactions in Complex Mixtures, 143–61. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-6530-3_8.

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Li-feng, Chen, and Lovat V. C. Rees. "Temperature-Programmed Desorption of Hydrocarbons from ZSM-5, ZSM-11, and Theta-1." In ACS Symposium Series, 440–51. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0368.ch027.

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Tsutsumi, K., K. Chubachi, A. Matsumoto, and T. Takaishi. "Adsorption-Induced Phase Transition of ZSM-5 Zeolites." In The Kluwer International Series in Engineering and Computer Science, 987–92. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_123.

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Burzo, E. "Structural properties of SBA-15, SBA-5 and ZSM-5 zeolites." In Magnetic Properties of Non-Metallic Inorganic Compounds Based on Transition Elements, 1263–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49337-3_55.

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Wang, Xueqin, and Xiangsheng Wang. "Aging and Coke Depositing on Nanometer ZSM-5 Zeolite." In Combinatorial Catalysis and High Throughput Catalyst Design and Testing, 447–50. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4329-5_22.

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Chihara, H., and N. Nakamura. "NQRS Data for Zeolite ZSM-5 (Subst. No. 2535)." In Substances Containing C10H16 … Zn, 1427. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02943-1_1270.

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Stave, Mark S., and John B. Nicholas. "Density Functional Studies of Boron Substituted Zeolite ZSM-5." In Theoretical and Computational Approaches to Interface Phenomena, 219–43. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1319-7_12.

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Conference papers on the topic "Zsm-5"

1

Simakov, Andrey V., Evgenii S. Stoyanov, Evgenii V. Rebrov, and N. N. Sazonova. "FTIR study of acetone oxime interaction with H-ZSM-5 and Cu-ZSM-5." In Optical Science and Technology, the SPIE 49th Annual Meeting, edited by Martin W. McCall and Graeme Dewar. SPIE, 2004. http://dx.doi.org/10.1117/12.560320.

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Осипова, К. А., Д. С. Сенатов, В. А. Охрименко, and Т. В. Аниськова. "Превращение н-нонана на цеолите ZSM-5." In Научные тенденции: Вопросы точных и технических наук. ЦНК МНИФ «Общественная наука», 2017. http://dx.doi.org/10.18411/spc-12-12-2017-02.

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Wang, Tianyou, Shuliang Liu, Hongjun Xu, Xing Li, Maolin Fu, Landong Li, and Naijia Guan. "Evaluation of In-Situ Synthesized Monolithic Metal-MFI/Cordierite Catalysts to Remove NOx From Lean Exhaust." In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1253.

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In this study, ZSM-5 zeolites were successfully in situ synthesized on the surface of honeycomb cordierite substrate and certified by XRD and SEM techniques. Strong interaction between zeolite and substrate has been found during in-situ synthesis, and hydrothermal stabilities of the zeolites was improved by entailing. The in-situ synthesized monolithic ZSM-5/cordierite showed superior thermal and hydrothermal stabilities. Cu-ZSM-5/cordierite was prepared by ion-exchange and impregnation methods were studied as catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NOx) in a lean-burn gasoline engine. Engine test results show that NOx emission was decreased by reductants of HC and CO in the exhaust gas without any other extra reducing agents. It also exhibited high activities. Using Cu-ZSM-5/cordierite, the maximum NOx conversion efficiency to N2 reached to 64% at the exhaust temperature of 400 °C and the gas hourly space velocity (GHTV) of 25 000/h. Meanwhile, the HC conversion efficiency was about 60%, while CO was little converted. Cu-ZSM-5/cordierite also showed good duration and anti-poison properties. Furthermore, the activated temperature of the Cu-ZSM-5/cordierite was decreased and the NOx conversion was increased via addition of iridium as a modifier.
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"Catalytic cracking of sunflower oils over ZSM-5 catalysts." In 2014 ASABE Annual International Meeting. American Society of Agricultural and Biological Engineers, 2014. http://dx.doi.org/10.13031/aim.20141893136.

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Kehlet, Louis Martinus, Pablo Beato, and Peter Tidemand-Lichtenberg. "Nonlinear Upconversion Based Infrared Spectroscopy on ZSM-5 Zeolite." In Integrated Photonics Research, Silicon and Nanophotonics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/iprsn.2017.jtu4a.18.

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Widayat, Widayat, and Arianti Nuur Annisa. "The effect of adding CTAB template in ZSM-5 synthesis." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY 2017. Author(s), 2017. http://dx.doi.org/10.1063/1.5011918.

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WANG, JIA, JOHAN C. GROEN, MARC-OLIVIER COPPENS, WENBO YUE, and WUZONG ZHOU. "SYNTHESIS OF ZEOLITE ZSM-5 COMPOSITES WITH A SINGLE TEMPLATE." In Proceedings of the 5th International Symposium. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812779168_0009.

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Phumman, Pimchanok, and Anuvat Sirivat. "Electrical conductivity response of poly(p-phenylene)/ZSM-5 composite." In 2007 7th IEEE Conference on Nanotechnology (IEEE-NANO). IEEE, 2007. http://dx.doi.org/10.1109/nano.2007.4601372.

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Kosivtsov, Yury, Yury Lugovoy, Kirill Chalov, Alexander Sidorov, and Mikhail Sulman. "INFLUENCE OF ZEOLITE CATALYSTS IMPREGNATED WITH TRANSITION METALS ON THE PROCESS OF DEOXYGENATION OF VOLATILE PRODUCTS OF FAST PYROLYSIS OF FLAX SHIVES." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/4.1/s17.15.

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A study was made of the influence of ZSM-5 zeolite on the composition and properties of the products of fast pyrolysis of flax shives in the temperature range of 350-750 �C. Zeolite ZSM-5 increased the heat of combustion of gaseous products, as well as the content of methane, ethylene, hydrogen, and carbon dioxide, which is probably associated with the processes of cracking of volatile products passing through a layer of a catalyst heated to high temperatures. The synthesis and study of zeolite catalysts ZSM-5 containing transition metals (Fe, Co, Ti, V, Mn, Zn, Cu, Cr) with a 2% metal concentration in the process of deoxygenation of volatile products of fast pyrolysis of waste biomass of plant origin. According to the activity in the deoxygenation process, the metals studied during the work stage can be arranged in the following descending order: Pd > Pt > Co > Cu > Ni > Fe > Cr > Mn > V > Ti > Zn.The 2%Co-ZSM-5 catalyst showed high activity in the deoxygenation process, since its use led to an increase in the low volumetric calorific value of the fast pyrolysis gas by 1.3-1.5 times, as well as to a decrease in the tars content.
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Yunus, Sharifah Noor Munirah S. M., Kamariah Noor Ismail, Ku Halim Ku Hamid, Rusmi Alias, Mohibah Musa, Muhd Hafiz Ramley, and Dicky Zulkainey Abd Aziz. "Preparation and characterization of multichannel catalyst monolith using ZSM-5 zeolite." In 2012 IEEE Colloquium on Humanities, Science and Engineering (CHUSER). IEEE, 2012. http://dx.doi.org/10.1109/chuser.2012.6504393.

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Reports on the topic "Zsm-5"

1

Barnabas, M. V., D. W. Werst, and A. D. Trifunac. Transformations of toluene radical cation in ZSM-5 and Silicalite. Office of Scientific and Technical Information (OSTI), November 1992. http://dx.doi.org/10.2172/10161958.

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Iton, L. E., T. O. Brun, J. E. Epperson, F. Trouw, J. W. White, and S. J. Henderson. Small-angle neutron scattering studies of the template-mediated crystallization of ZSM-5 type zeolite. Office of Scientific and Technical Information (OSTI), March 1988. http://dx.doi.org/10.2172/7109064.

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Barnabas, M. V., and A. D. Trifunac. Radical cations of quadricyclane and norbornadiene in polar ZSM-5 matrices: Radical cation photochemical transformations without photons. Office of Scientific and Technical Information (OSTI), June 1994. http://dx.doi.org/10.2172/10161026.

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