Reaction characteristics of maximizing light olefins and decreasing methane in C_(5) hydrocarbons catalytic pyrolysis  

作　　者：Mei-Jia Liu Gang Wang Shun-Nian Xu Tao-Ran Zheng Zhong-Dong Zhang Sheng-Bao He 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Bejing,102249,China [2]Petrochemical Research Institute,PetroChina,Bejing,102206,China

出　　处：《Petroleum Science》2023年第3期1909-1921,共13页石油科学（英文版）

基　　金：supported by Program of China National Petroleum Corporation(2020B-2012;2022zS27);the General Program of National Natural Science Foundation of China(22178385).

摘　　要：When converting C_(5) hydrocarbons to light olefins by catalytic pyrolysis,the generation of low value-added methane will affect the atomic utilization efficiency of C_(5) hydrocarbons.To improve the atomic utilization efficiency,different generation pathways of light olefins and methane in the catalytic pyrolysis of C_(5) hydrocarbons were analyzed,and the effects of reaction conditions and zeolite types were inves-tigated.Results showed that light olefins were mainly formed by breaking the C_(2)-C_(3) bond in the middle position,while methane was formed by breaking the C_(1)-C_(2) bond at the end.Meanwhile,it was discovered that the hydrogen transfer reaction could be reduced by about 90%by selecting MTT zeolite with 1D topology and FER zeolite with 2D topology under high weight hourly space velocity(WHSV)and high temperature operations,thus leading to the improvement of the light olefins selectivity for the catalytic pyrolysis of n-pentane and 1-pentene to 55.12% and 74.60%,respectively.Moreover,the fraction ratio of terminal C_(1)-C_(2) bond cleavage was reduced,which would reduce the selectivity of methane to 6.63%and 1.83%.Therefore,zeolite with low hydrogen transfer activity and catalytic pyrolysis process with high WHsV will be conducive to maximize light olefins and to decrease methane.

关 键 词：N-PENTANE 1-Pentene Catalytic pyrolysis Light olefins METHANE 

分 类 号：X742[环境科学与工程—环境工程]