Mn改性SAPO-34分子筛及其MTO催化性能研究  

Mn modified molecular sieve SAPO-34 and its catalytic performance

作　　者：王兴旺 李世洪 孙岩 李国辉 楚海强 张丽莉 

机构地区：[1]中国石油工程设计有限公司北京分公司,北京100083

出　　处：《现代化工》2015年第5期85-87,共3页Modern Chemical Industry

摘　　要：采用浸渍法向SAPO-34分子筛引入Mn助剂对其进行改性,借助X射线衍射(XRD)、NH3程序升温脱附(NH3-TPD)、红外光谱(FT-IR)和程序升温氧化(TPO)等对改性前后的分子筛进行表征。结果表明,Mn助剂的引入对SAPO-34分子筛的晶体结构影响较小,对分子筛的表面酸性影响较大。与改性前相比,改性后的分子筛具有较好的稳定性。最后,将Mn改性前后的分子筛用于MTO反应。结果表明,Mn改性的SAPO-34分子筛具有更高的烯烃选择性。SAPO-34 molecular sieve is modified by adding Mn additive with impregnation method. X-ray diffraction （XRD）, NH3 temperature programmed desorption （NH3-TPD） , infrared spectroscopy （FT-IR）, temperature programmed oxidation （TPO） and other methods are used to characterize the molecular sieve before and after modification. The result shows that the introduction of the Mn additive has little effect on SAPO-34 molecular sieve crystal structure, but has great influence on the surface acidity. Compared with unmodified SAPO-34 molecular sieve, the stability of the modified one is greatly improved. Finally, the Mn modified and unmodified molecular sieve are used for MTO reaction. The results show that, Mn-modifiod SAPO-34 molecular sieve has higher olefin selectivity than that of the unmodified one.

关 键 词：SAPO-34分子筛 浸渍法 Mn改性 MTO 

分 类 号：TQ426.95[化学工程]