摘要
研究了北方某煤化工企业甲醇合成芳烃失活催化剂的失活原因,通过低温氮吸附方法(BET)、电感耦合等离子体法(ICP)、扫描电子显微镜(SEM)和X射线衍射分析(XRD)等方法对样品进行了分析,结果发现,在失活催化剂的表面存在一层红色铁氧化物颗粒,而这些颗粒并未进入催化剂颗粒内部,失活催化剂的晶型依然为较好的ZSM-5分子筛,孔结构也没有发生显著的恶化,因此推断,催化剂可能的失活原因就是表面积累的铁氧化物在甲醇转化为芳烃的反应中首先催化了甲醇脱氢,导致结焦和积碳,进而迅速降低了催化活性并缩短了催化剂的再生周期。对催化剂表面铁氧化物的来源进行了初步分析。
The failure reason of one catalyst for preparing arenes with methanol was investigated.Brunauer-Emmett-Teller（BET）, Inductive Coupled Plasma Emission Spectrometer（ICP）, Scanning Electron Microscope（SEM） and X-ray Diffraction（XRD） methods were employed to analyze the catalyst sample. It was revealed by the results that one layer of red iron oxide particles were accumulated on the surface of catalyst, but iron oxide particles was not found inside of the catalyst particles. The deactivated catalyst exhibited good ZSM-5 zeolite crystal form. The pore structure showed no obvious collapse. It could be safely concluded that the failure of the catalyst was resulted from the iron oxide accumulated on the surface of catalyst particles. These iron particles dehydrated methanol and caused coke and carbon formation which badly deteriorated the catalytic performance and reduced the regenerating period. The source of the iron oxides was preliminarily analyzed.
出处
《煤炭技术》
北大核心
2017年第7期269-272,共4页
Coal Technology
基金
中国科学院先导专项B(XDB05050400)
中国科学院知识创新工程(YYYJ-1106)
国家高技术研究发展计划(863:2013AA065102)资助项目
关键词
甲醇
芳烃
催化剂
失活
methanol
arenes
catalyst
deactivation
