石油化工2025，Vol.54Issue(5)：618-625,8.DOI:10.3969/j.issn.1000-8144.2025.05.002
水热处理对ZSM-5分子筛酸性及丁烯催化裂解反应性能的影响
Effect of hydrothermal treatment on the acidity of ZSM-5 molecular sieves and the performance of butene catalytic cracking reaction
摘要
Abstract
The hydrothermal treatment of ZSM-5 molecular sieves was carried out.The structure and acidity of the samples before and after the modification were characterised by techniques,such as XRD,XRF,N2 adsorption-desorption and NH3-TPD.With atmospheric pressure of 500℃,and the butene WHSV of 10 h-1,the performance of the modified catalysts,in a continuous fixed bed reactor in the butene catalytic cracking reaction was investigated.The results show that hydrothermal treatment at a moderate temperature and washing with citric acid leads to skeleton de-alumination of ZSM-5 molecular sieves,reduction of catalyst acid volume,decrease of acid strength,and increase in mesopore volume.After hydrothermal treatment at 650℃for 2 h,the butene initial conversion decreases from 88.4%to 73.6%,and after 20 h of continuous reaction,the propylene selectivity increases from 31.1%to 45.7%,and the propylene yield rises from 27.6%to 33.5%.the carbon accumulation of the catalyst drops from 1.6%(w)to 1.1%(w).The stability and anti-carbon accumulation ability of the catalyst were both improved.关键词
丁烯裂解/分子筛/催化剂/稳定性Key words
butene cracking/molecular sieves/catalyst/stability分类
化学工程引用本文复制引用
周庆祥,童燕兵,柯明..水热处理对ZSM-5分子筛酸性及丁烯催化裂解反应性能的影响[J].石油化工,2025,54(5):618-625,8.基金项目
国家自然科学基金项目(21776505). （21776505）
