主讲人：马丁教授
时间：1月13日下午15:00
地点：丽湖校区守正楼212会议室

报告人简介：

马丁，北京大学化学与分子工程学院教授。针对我国社会能源和资源优化利用过程，主要开展氢能制备与输运，高值碳基化学品/油品合成， 以及催化反应机理研究等方面研究工作。获得2013年度北京大学青年教师教学比赛一等奖， 2019年北京大学十佳导师。目前担任Chinese Journal of Chemistry、 ACS Catalysis 副主编。

报告摘要：

Transformation of syngas (CO/H₂) derived from shale gas, biomass and coal has been developed as a promising alternative to oil to prepare liquid fuels and commodity chemicals.

Here we reported that Zn and Na modulated Fe catalysts can be fabricated through a simple co-precipitation/washing method. Zn greatly changed the size of iron species, serving as the structural promoter while the existence of Na on the surface of Fe catalyst alters the electronic structure of the catalyst, making it very active for CO activation. Most importantly, the unique electronic structure suppresses the hydrogenation of double bonds and promotes desorption of products, which confers the catalyst unexpected reaction patch towards the alkenes, especially C₅₊ alkenes, at the same time of lowering the selectivity towards underside products.

A combination of Na-Zn-Fe₅C₂ and hierarchical zeolite with uniform mesopores dramatically changed the product distribution of FTS, leading to 51% aromatic selectivity under the stable stage with CO conversion > 85%. C₁₂₊ heavy hydrocarbons almost disappeared and the catalyst showed good stability. The hierarchical zeolitic structure and Brønsted acidity of zeolite can be precisely tuned by controlling alkali treatment conditions and ion-exchange degrees. It is the appropriate density and strength of the Brønsted acid sites and the hierarchical pore structure of HZSM-5 that endows the catalyst un-precedented aromatics yield.

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