摘要
利用X射线衍射法、NH3-程序升温脱附法、傅里叶变换红外光谱法等技术对不同Si O2/Al2O3(简称硅铝比,摩尔比,下同)的HZSM-5分子筛进行了表征,并且在微反评价装置上对分子筛催化正丁烷高温裂解活性进行了评价。结果表明:当硅铝比分别为38,200,470(依次命名为试样1~试样3)时,随着硅铝比的增加,分子筛BET比表面积增大,强酸性位的强度降低。当裂解温度由823 K升高至873 K时,各试样的转化率均提高,转化率由高到低依次为试样1、试样2、试样3。随着反应温度的升高,甲烷、乙烷、乙烯和丙烯的选择性显著提高;甲烷和乙烷的选择性始终高于乙烯和丙烯。
HZSM -5 zeolites with different SiO2/ A12Oa（mole ratio） were characterized by X- ray diffraction, NHa -temperature programmed desorption, and Fourier transform infrared spectroscopy, etc, and the high temperature pyrolysis activity of nbutane over HZSM -5 zeolites was evaluated in a microreactor evaluation unit. The results showed that the specific surface area of zeolites increased and strength of strong acid sites decreased with the increasing of Si02/AI203 ,when SiO2/A1203 was 38, 200 and 470 named sample 1 ,sample 2,and sample3, respectively. The conversion of all the samples in- creased with the pyrolysis temperature increasing from 823 K to 873 K, and the conversion from the highest to the lowest was ： sample 1, sample 2, sam- ple 3. On the other side, with the increase of reaction temperature, the selectivity of methane, ethane, eth- ylene and propylene increased obviously, the selec- tivity of methane and ethane was always higher than that of ethylene and propylene.
作者
张文芳
王鹏照
杨朝合
李春义
ZHANG Wen-fang;WANG Peng-zhao;YANG Chao-he;LI Chun-yi(State Key Laboratory of Heavy Oil Processing,China University of Pertroleum（East China）,Qingdao 266580,China)
出处
《石化技术与应用》
CAS
2018年第6期382-385,共4页
Petrochemical Technology & Application
基金
中国石油大学(华东)研究生自主创新工程基金资助项目(项目编号:YCX 2018036)
