Effects of particle size on catalytic conversion of ethanol to propylene over H-ZSM-5 catalysts—Smaller is better

Xia, Wei; Chen, Kun; Takahashi, Atsushi; Li, Xiuyi; Mu, Xichuan; Chen, Han; Liu, Li; Nakamura, Isao; Fujitani, Tadahiro

doi:10.1016/j.catcom.2015.10.008

Cited by 36 publications

(9 citation statements)

References 26 publications

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“…This is attributable to the reality that zeolites with smaller particle sizes have enhanced availability and shorter diffusion channel lengths, both of which can minimize the likelihood of coke generation occurring. A phenomenon related to that mentioned above was observed by Xia et al, 62 who demonstrated that reducing the particle size of H-ZSM-5 resulted in a rise in the amount of propylene produced. 62 In the ETP process, modified H-ZSM-5 zeolites have been developed to improve the specificity toward propylene and the stability of the catalysts.…”

Section: Catalytic Transformation Of Bioethanol To Olefinssupporting

confidence: 60%

“…A phenomenon related to that mentioned above was observed by Xia et al, 62 who demonstrated that reducing the particle size of H-ZSM-5 resulted in a rise in the amount of propylene produced. 62 In the ETP process, modified H-ZSM-5 zeolites have been developed to improve the specificity toward propylene and the stability of the catalysts. 63,64 It was stated that the altered H-ZSM-5 catalysts led to a propylene specificity of around 30%.…”

Section: Catalytic Transformation Of Bioethanol To Olefinssupporting

confidence: 60%

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Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Anekwe

Isa

Oboirien

2023

J of Chemical Tech & Biotech

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Bioethanol, synthesized through the valorization of biomass resources, is of great importance to many industries. As bioethanol has become more abundant and its price has decreased, it has become an attractive candidate for application as a base material for the synthesis of a variety of petrochemicals and fuel through catalysis. In this article, a comprehensive review of the catalytic conversion of bioethanol into hydrocarbons, including olefins and gasoline, is presented. In addition, developments and potential research opportunities in the field of bioethanol catalysis are provided to enhance bioethanol conversion. According to the findings of the study, despite significant progress in bioethanol conversion, further research is needed to address several challenges that will enable improved biofuel and chemical production.

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Section: Catalytic Transformation Of Bioethanol To Olefinssupporting

confidence: 60%

Section: Catalytic Transformation Of Bioethanol To Olefinssupporting

confidence: 60%

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Anekwe

Isa

Oboirien

2023

J of Chemical Tech & Biotech

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“…This increased selectivity toward C 3+ olefins over Cu−Zn−Y 7 /Beta is predominantly due to the inhibition or elimination of the reactions generating side products (e.g., ethylene, aromatics, CO 2 , light paraffins). For example, the selectivity of ethylene, the main side product from ethanol dehydration, is dramatically reduced to <10%, in drastic comparison with higher ethylene selectivity in pathways that are catalyzed by Brønsted acid zeolites 49 and transition-metal-promoted Lewis acid oxides. 25 The absence of detectable CO 2 suggests the propensity of Cu−Zn−Y 7 /Beta to avoid the acetone-based pathway, which is generally catalyzed by strong basic oxide catalysts (e.g., ZnZrO x 23 and CeO 2 , 50 as shown in Table S7).…”

Section: Resultsmentioning

confidence: 99%

Isolated Metal Sites in Cu–Zn–Y/Beta for Direct and Selective Butene-Rich C₃₊ Olefin Formation from Ethanol

et al. 2021

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Direct and selective production of C 3+ olefins from bioethanol remains a critical challenge and important for the production of renewable transportation fuels such as aviation biofuels. Here, we report a Cu−Zn−Y/Beta catalyst for selective ethanol conversion to butene-rich C 3+ olefins (88% selectivity at 100% ethanol conversion, 623 K), where the Cu, Zn, and Y sites are all highly dispersed. The ethanol-to-butene reaction network includes ethanol dehydrogenation, aldol condensation to crotonaldehyde, and hydrogenation to butyraldehyde, followed by further hydrogenation and dehydration reactions to form butenes. Cu sites play a critical role in promoting hydrogenation of the crotonaldehyde CC bond to form butyraldehyde in the presence of hydrogen, making this a distinctive pathway from crotyl alcohol-based ethanol-to-butadiene reaction. Reaction rate measurements in the presence of ethanol and acetaldehyde (543 K, 12 kPa ethanol, 1.2 kPa acetaldehyde, 101.9 kPa H 2 ) over monometallic Zn/ Beta and Y/Beta catalysts indicate that Y sites have higher C−C coupling rates than over Zn sites (initial C−C coupling rate, 6.1 × 10 −3 mol mol Y −1 s −1 vs 1.2 × 10 −3 mol mol Zn −1 s −1 ). Further, Lewis-acidic Y-site densities over Cu−Zn−Y/Beta with varied Y loadings are linearly correlated with the initial C−C coupling rates, suggesting that Lewis-acidic Y sites are the predominant sites that catalyze C−C coupling in Cu−Zn−Y/Beta catalysts. Control experiments show that the dealuminated Beta support is important to form higher density of Lewis-acidic Y sites in comparison with other supports such as silica, or deboronated MWW despite similar atomic dispersion of Y sites and Y−O coordination numbers over these supports, leading to more than 9 times higher C−C coupling rate per mole Y over dealuminated Beta relative to other supports. This study highlights the significance of unique combination of metal sites in contributing to the selective valorization of ethanol to C 3+ olefins, motivating for exploring multifunctional zeolite catalysts, where the presence of multiple sites with varying reactivities and functions allows for controlling the predominant molecular fluxes toward the desired products in complex reactions.

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“…But increasing ethylene capacity has led researchers to turn their attention to propylene. In the past two decades, the study of the conversion of ethanol to propylene (ETP) has become a research hotspot [3], and some researchers have reported the conversion of ethanol to hydrocarbons over unmodified or metal-modified ZSM-5 catalysts [4][5][6][7][8][9][10][11][12][13][14][15]. Other zeolites [15][16][17] (such as mordenite, beta-zeolite, ferrierite, Y-zeolite, and SAPO-34) have also been used as catalysts for the ETO reaction.…”

Section: Introductionmentioning

confidence: 99%

Bioethanol Conversion into Propylene over Various Zeolite Catalysts: Reaction Optimization and Catalyst Deactivation

Xia

Huang

et al. 2022

Nanomaterials

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Catalytic conversions of bioethanol to propylene were investigated over different zeolite catalysts. H-ZSM-5 (SiO2/Al2O3 = 80) was found to be the most effective for propylene production. Furthermore, H-ZSM-5 (SiO2/Al2O3 = 80) was investigated under different variables of catalytic reaction (calcination temperature, feed composition, reaction temperature, and time on stream) for the conversion of ethanol to propylene. The H-ZSM-5(80) catalysts calcined at 600 °C showed the highest propylene yield. The moderate acidic site on ZSM-5 is required for the production of propylene. The activity on ZSM-5 is independent of the ethanol feed composition. H-ZSM-5 catalyst deactivation was observed, owing to dealumination. The highest propylene yield was 23.4% obtained over HZSM-5(80). Propylene, butene, and ≥C5 olefins were formed by parallel reaction from ethylene. Olefins were converted to each paraffin by sequential hydrogenation reaction. HZSM-5(80) catalyst is a promising catalyst not only for ethanol but also for the conversion of bioethanol to light olefins.

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Effects of particle size on catalytic conversion of ethanol to propylene over H-ZSM-5 catalysts—Smaller is better

Cited by 36 publications

References 26 publications

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Isolated Metal Sites in Cu–Zn–Y/Beta for Direct and Selective Butene-Rich C₃₊ Olefin Formation from Ethanol

Bioethanol Conversion into Propylene over Various Zeolite Catalysts: Reaction Optimization and Catalyst Deactivation

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Effects of particle size on catalytic conversion of ethanol to propylene over H-ZSM-5 catalysts—Smaller is better

Cited by 36 publications

References 26 publications

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Isolated Metal Sites in Cu–Zn–Y/Beta for Direct and Selective Butene-Rich C3+ Olefin Formation from Ethanol

Bioethanol Conversion into Propylene over Various Zeolite Catalysts: Reaction Optimization and Catalyst Deactivation

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Isolated Metal Sites in Cu–Zn–Y/Beta for Direct and Selective Butene-Rich C₃₊ Olefin Formation from Ethanol