Benzene Alkylation with Propane over Mo Modified HZSM-5 |
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Authors: | Xueqing Huang Xinde Sun Shukui Zhu Zhongmin Liu |
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Affiliation: | (1) Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian, 116023, Liaoning, China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China;(3) Daqing Oilfield Company Limited, Daqing, 163000, Heilongjiang, China |
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Abstract: | Benzene alkylation with propane has been studied over HZSM-5 loading 3.1–15.4 wt% Mo in continuous-flow microreactor under
350 °C and atmospheric pressure with the highest activity obtained at 6.7 wt% Mo loading. C7–9 aromatics were obtained as main products while the total amount of benzene rings kept unchanged. i-Propylbenzene and n-propylbenzene are formed primarily, while toluene, ethylbenzene, and ethyl-toluene are formed secondly from the propylbenzenes.
Catalytic performance of 6.7 wt% Mo/HZSM-5(38) partially poisoned by NH3 shows that the strong acid sites play a crucial role in the alkylation. Low SiO2/Al2O3 ratio of HZSM-5 in the Mo modified catalysts gives high propane conversion. Two hydrothermal treatment methods were applied
to the 6.7 wt% Mo/HZSM-5(38) catalyst, caused decrease of propane conversion but result in different product distribution.
A possible reaction mechanism concerning bifunctional active centers resulted from combination of loaded Mo species and strong
acid centers on HZSM-5 is proposed. |
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Keywords: | Benzene Propane ZSM-5 Alkylation Acidity |
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