Increased Light Olefin Production by Sequential Dehydrogenation and Cracking Reactions

In this study, a sequential reaction using selected metal oxides, followed by ZSM-5-based catalysts, was employed to demonstrate a promising route for enhancing light olefin production in the catalytic cracking of naphtha. The rationale for the reaction is based on the induction of alkenes into hydr...

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Bibliographic Details
Published inCatalysts Vol. 12; no. 11; p. 1457
Main Authors Zhang, Xiaoqiao, Gong, Jianhong, Wei, Xiaoli, Liu, Lingtao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2022
Subjects
Acids
Adsorption
Alkanes
Alkenes
Aluminum oxide
Catalysts
Catalytic activity
Catalytic cracking
Chemical industry
Chemical reactions
cracking
Dehydrogenation
DFT calculation
Energy conservation
Energy consumption
Ethylene
Herbicides
Hydrogen
Light
Metal oxides
Metals
Naphtha
Optimization
Pesticides industry
Petroleum
Pore size
Production processes
Propylene
Refining
Stability tests
Supply and demand
synergetic effect
Technology application
Zeolites
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Summary:In this study, a sequential reaction using selected metal oxides, followed by ZSM-5-based catalysts, was employed to demonstrate a promising route for enhancing light olefin production in the catalytic cracking of naphtha. The rationale for the reaction is based on the induction of alkenes into hydrocarbon feeds prior to cracking. The optimum olefin induction was achieved by carefully optimizing the dehydrogenation active sites Mo/Al2O3 catalyst. The formed alkenes have a lower activation energy for C-H/C-C bond breaking compared to alkanes. This could accelerate the formation of carbenium ions, thus promoting the conversion of n-octane to produce light olefins. Detailed product distribution and DFT calculation indicated a remarkable increase in ethylene and propylene production in the final product through a modified reaction pathway. Compared with the common metal-promoted zeolite catalysts, the new route could avoid the block of zeolite channels and corresponding decreased catalytic cracking activity. The feasibility of the proposed route was confirmed with different ratios of dehydrogenation catalyst to the reactant. The highest yields of ethylene and propylene reached 13.22% and 33.12% with ratios of Mo/Al2O3 and ZSM-5-based catalyst to n-octane both 10:1 at 600 °C. Stability tests showed that the catalytic activity of the double-bed system was stable over 10 cycles.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12111457