Zeolite catalysts in upgrading of bioethanol to fuels range hydrocarbons: A review

Galadima, Ahmad; Muraza, Oki

doi:10.1016/j.jiec.2015.07.015

Cited by 75 publications

(31 citation statements)

References 169 publications

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“…At the same time, the average pore size of the molecular sieve was reduced to convert the mesoporous molecular sieve to microporous, which may impart a diffusion barrier and influence product diffusion in the micropores, resulting in an increase in shape selectivity. It could effectively inhibit the progress of the secondary reaction and reduce the generation of byproducts [22]. According to the shape-selective catalysis theory, the critical diameter of the reactant ethanol molecule is smaller than the pore diameter of the catalyst, so it can enter into the catalyst pore and contact with the inner surface of the catalyst for catalytic reaction, which is helpful for reactant shape selection catalysis.…”

Section: Coke Formationmentioning

confidence: 99%

“…This suggested that the ETO process may also follow HCP pathways [21]. Furthermore, it has also been reported that the modification of zeolite with transition metals affects the selectivity of hydrocarbon compounds by changing the structural properties of zeolite [22]. At present, there are many reports on the application of the modified SAPO-34 molecular sieve to MTO, but relatively few reports on the application of the modified SAPO-34 molecular sieve to the reaction of ethanol to ethylene.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Highly Selective and Stable Co-Cr/SAPO-34 Catalyst for the Catalytic Dehydration of Ethanol to Ethylene

et al. 2020

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In this study, silicoaluminophosphate (SAPO)-34 and Me (Me = Cr, Co)-modified SAPO-34 were synthesized and used as catalysts to investigate the catalytic performance by means of a probe reaction from ethanol to ethylene. The metal oxides were loaded on the SAPO-34 support via an impregnation method. The synthesized catalysts were characterized using XRD, SEM, EDX, FT-IR, NH3-TPD, BET, and TGA techniques. Compared to SAPO-34, SAPO-34 doped with metal oxides showed the same chabazite (CHA) topology. The structure and properties of the catalyst were further optimized by varying the amount of Me. The experimental results showed that Co-Cr/SAPO-34 exhibited the best catalytic performance when the reaction temperature reached 400 °C at a weight hourly space velocity (WHSV) of 3.5 h−1, for which the single-pass conversion of ethanol was determined as 99.15%, and the selectivity of ethylene was 99.4% at an optimum catalytic performance in the reaction of up to 600 min. In addition, Co-Cr/SAPO-34 exhibited better catalytic activity and anti-coking ability than pure SAPO-34, which was attributed to its enhanced pore structure and moderate acidity. It can also be concluded from the results of this experiment that the performance of the Co-Cr bimetal-supported catalyst is better than that of the Cr mono-metal catalyst.

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Section: Coke Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Highly Selective and Stable Co-Cr/SAPO-34 Catalyst for the Catalytic Dehydration of Ethanol to Ethylene

et al. 2020

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“…) in the presence of HAlBEA zeolite is initially formed, which probably results from the consecutive reactions of ethylene. Direct production of C2-C4 olefins and higher hydrocarbons (gasoline-range) by the conversion of bioethanol (ethanol to gasoline, ETG) has recently gained great interests [64][65][66][67][68]. Formation of propane can be directly related to the higher acidity of HAlBEA zeolite.…”

Section: Catalytic Performance In the Steam Reforming Of Ethanolmentioning

confidence: 99%

Effects of dealumination on the performance of Ni-containing BEA catalysts in bioethanol steam reforming

Gac

Greluk

Słowik

et al. 2018

Applied Catalysis B: Environmental

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The effects of dealumination of BEA zeolite on the formation of nickel active sites and the performance of Nicontaining BEA zeolite catalysts in the steam reforming of ethanol have been studied. Ni-containing BEA zeolite catalysts were prepared by the impregnation of unmodified and dealuminated BEA zeolites with Ni(NO 3) 2 precursor. The properties of Ni 10 HAlBEA and Ni 10 SiBEA zeolite catalysts were studied by means of X-ray diffraction, 1 H, 27 Al and 29 Si magic-angle spinning nuclear magnetic resonance, Fourier-transform infrared and Raman spectroscopy, transmission electron microscopy, temperature-programmed reduction, temperature-programmed ammonia and hydrogen desorption methods. High initial activity and selectivity of Ni 10 HAlBEA to hydrogen and carbon dioxide with unmodified BEA zeolite support in the steam reforming of ethanol reaction performed at 500°C was observed. However, fast deactivation of Ni 10 HAlBEA catalyst, manifested in the decrease of water conversion, drop of selectivity to H 2 and CO 2 , and increase in the selectivity to ethylene with the time-on-stream, was observed. In contrast, Ni 10 SiBEA zeolite catalyst showed lower initial activity but higher durability and resistance for carbon deposition. It was stated that dealumination of BEA zeolite led to the slight structural changes and simultaneously pronounced decrease of acidity. Formation of the large nickel crystallites was hindered on Ni 10 SiBEA zeolite catalyst. TEM and Raman spectroscopy studies indicated that deactivation of Ni 10 HAlBEA was related to formation of nickel mediated filamentous, graphitic and amorphous carbon deposits. Much smaller amounts of filamentous carbons were observed on the Ni 10 SiBEA zeolite catalyst prepared by the use of dealuminated zeolite support.

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“…Note that the strong external acid sites are responsible for the coke formation due to the shape selectivity of HZSM-5 zeolites makes it difficult to form coke in the internal pores, a promising process to lower the strong external acid sites but retain the internal weak sites is to selectively eliminate the strong acid sites by dealumination [18]. For this reason, ethylene diamine tetraacetic acid (EDTA) showed prevalent ability to remove the framework aluminums [19].…”

Section: Introductionmentioning

confidence: 99%

Modification and regeneration of HZSM-5 catalyst in microwave assisted catalytic fast pyrolysis of mushroom waste

Wang

Zhong

Song

et al. 2016

Energy Conversion and Management

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Zeolite catalysts in upgrading of bioethanol to fuels range hydrocarbons: A review

Cited by 75 publications

References 169 publications

Synthesis of Highly Selective and Stable Co-Cr/SAPO-34 Catalyst for the Catalytic Dehydration of Ethanol to Ethylene

Synthesis of Highly Selective and Stable Co-Cr/SAPO-34 Catalyst for the Catalytic Dehydration of Ethanol to Ethylene

Effects of dealumination on the performance of Ni-containing BEA catalysts in bioethanol steam reforming

Modification and regeneration of HZSM-5 catalyst in microwave assisted catalytic fast pyrolysis of mushroom waste

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