Mo基分子筛催化剂及甲烷无氧芳构化

本文综述了甲烷无氧芳构化反应及Mo基分子筛催化剂的研究进展。在众多的催化剂中以Mo基分子筛催化性能最佳。概括了催化剂中关于MoO_<em>x前躯体结构和其在分子筛中落位,Mo₂C物种和诱导期等;讨论了反应中涉及的中间产物、双功能机理以及催化剂失活等问题;归纳了催化剂制备过程中制备方法、焙烧温度与时间、Mo载量和分子筛硅铝比以及催化剂预处理对反应活性的影响;综述了提高催化剂催化性能和反应性能的各种方法,并对其分析,同时介绍了两种催化剂再生方法。最后,依据本实验室研究进展,对甲烷芳构化从工艺角度进行一些可行性讨论,并提出相关问题和展望。

Mo-Based Zeolite Catalysts and Oxygen-Free Methane Aromatization

Among the investigated catalysts, the Mo-based zeolite catalysts showed the highest catalytic activity. These catalysts were systematically discussed on MoO_<em>x structure and its location in zeolite, the active Mo species and its carburization in the induction period. The issues on intermediates, the bi-functional reaction mechanism and catalyst deactivation with coke were also discussed. The effect of preparation method, calcination temperature and time, Mo loading, ratio of SiO₂ to Al₂O₃ and the catalyst pretreatment in reaction on the catalytic performance of Mo-based catalyst were demonstrated. Then the ways to improve the catalyst activity and reaction stability were comprehensively introduced, pointing out that the catalyst was always deactivated due to coke and needed regeneration. At last according to our research results the discussion and analysis in the view of engineering technology for methane dehydroaromatization were given, and some problems needed to be solved were put forward.