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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 reasons for deactivation of the catalyst for methanol synthesis of aromatics in a coal chemical industry in northern China were studied. The catalysts were characterized by low temperature nitrogen adsorption (BET), inductively coupled plasma (ICP), scanning electron microscopy (SEM) and X-ray diffraction (XRD) The results showed that there was a layer of red iron oxide particles on the surface of the deactivated catalyst, and these particles did not enter the catalyst particles. The morphology of the deactivated catalyst was still better. Molecular sieve pore structure did not occur significantly deteriorated, it is concluded that the possible catalyst deactivation reason is that the surface accumulation of iron oxide in the methanol to aromatics reaction catalyzed first methanol dehydrogenation, resulting in coking and carbon deposition, and then quickly Reduce the catalytic activity and shorten the catalyst regeneration cycle. The origin of iron oxide on the surface of catalyst was preliminarily analyzed.