Ethane and ethylene aromatization on zinc-containing zeolites

Mehdad, Ali; Lobo, Raúl F.

doi:10.1039/c7cy00890b

Cited by 104 publications

(70 citation statements)

References 58 publications

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“…did not observe an activation period when feeding C 2 H 4 to Mo/HZSM‐5. Both ethylene as well as acetylene were shown to immediately oligomerize with near to 100 % conversion when contacted with a zeolite even at 300 °C, while ethane reacts more slowly . With both reactants, deactivation of the catalyst due to coking is fast .…”

Section: C2 Intermediatesmentioning

confidence: 99%

“…Both ethylene as well as acetylene were shown to immediately oligomerize with near to 100 % conversion when contacted with a zeolite even at 300 °C, while ethane reacts more slowly . With both reactants, deactivation of the catalyst due to coking is fast . Although most often ethylene, ethane and acetylene are proposed as reaction intermediates, higher intermediates are conceivable as well, especially if ethylene strongly adsorbs on the active metal and has to further react with gas‐phase CH 4 to desorb.…”

Section: C2 Intermediatesmentioning

confidence: 99%

“…But most papers assume that ethylene is activated by forming a carbocation (C 2 H 5 + ) with the help of the proton from the acid site . Ethylene aromatization has been explored on HZSM‐5 at 400 °C,, 480 °C, 500 °C, and 540 °C using very diluted streams of ethylene to slow down coking. Qiu et al .…”

Section: Ethylene Aromatizationmentioning

confidence: 99%

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Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

et al. 2018

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To secure future supply of aromatics, methane is a commercially interesting alternative feedstock. Direct conversion of methane into aromatics combines the challenge of activating one of the strongest C−H bonds in all hydrocarbons with the selective aromatization over zeolites. To address these challenges, smart catalyst and process design are a must. And for that, understanding the most important factors leading to successful methane C−H bond activation and selective aromatization is needed. In this review, we summarize mechanistic insight that has been gained so far not only for this reaction, but also for other similar processes involving aromatization reactions over zeolites. With that, we highlight what can be learnt from similar processes. In addition, we provide an overview of characterization tools and strategies, which are useful to gain structural information about this particular metal‐zeolite system at reaction conditions. Here we also aim to inspire future characterization work, by giving an outlook on characterization strategies that have not yet been applied for the methane dehydroaromatization catalyst, but are promising for this system.

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Section: C2 Intermediatesmentioning

confidence: 99%

Section: C2 Intermediatesmentioning

confidence: 99%

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Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

et al. 2018

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“…With the low price of natural gas – and even declining over time ‐, natural gas opens up an opportunity to produce BTX from the light hydrocarbon components of natural gas. Considering that ethane is often an abundant component in natural gas, the process for the direct conversion of ethane to BTX has gained increased attention in the industry for the last few decades . Hence, this work is focused on studying the direct conversion of ethane into BTX.…”

Section: Introductionmentioning

confidence: 99%

“…They demonstrated that the most effective catalyst is zinc containing ZSM‐5. Mehdad et al . investigated the conversion of ethane and ethylene on zinc‐containing SSZ‐13 and ZSM‐5.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Performance of Zn‐containing HZSM‐5 upon Selective Desilication in Ethane Dehydroaromatization Process

et al. 2020

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The effect of introducing mesoporosity on the catalytic stability and selectivity of Zn‐containing ZSM‐5 catalysts was investigated for direct conversion of ethane to high‐value aromatics. Voids and mesopores were created in the zeolite (Si/Al=40) by selective desilication (recrystallization) using ammonium hydroxide and cetyltrimethylammonium bromide. Zinc was incorporated in the samples by incipient wetness impregnation to achieve different concentrations of 0.5, 1 and 5 wt %. The samples were characterized by XRD, N2 physisorption, TGA, NH3‐TPD, ICP‐OES, FTIR, 1H, 27Al and 29Si solid‐state MAS NMR. The desilicated samples were compared to their parent analogues for ethane conversion to aromatics such as benzene, toluene and xylenes (BTX). All of the desilicated samples showed an improvement in BTX yield and catalytic stability. Thus, the presence of mesoporosity increases the accessibility to the active sites and facilitates the mass transfer of aromatic compounds, which result in higher performance and catalytic stability of the desilicated ZSM‐5 samples containing zinc.

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Light Alkane Aromatization: Efficient use of Natural Gas

Kanitkar

Spivey

2018

Natural Gas Processing From Midstream to Downstream

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Ethane and ethylene aromatization on zinc-containing zeolites

Abstract: The importance of balance between the number of Zn and Brønsted acid sites for aromatization of ethane and ethylene on Zn-ZSM-5 is discussed.

Cited by 104 publications

References 58 publications

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

Enhanced Catalytic Performance of Zn‐containing HZSM‐5 upon Selective Desilication in Ethane Dehydroaromatization Process

Light Alkane Aromatization: Efficient use of Natural Gas

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