学术报告:铁基费托合成催化剂选择性调控

发布者:金霞发布时间:2018-10-08浏览次数:10

马丁

报告题目:铁基费托合成催化剂选择性调控

报告时间:20181014日上午10:00

报告地点:新能源大楼102会议室

报告人简介:

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马丁,北京大学化学与分子工程学院/北京大学工学院教授。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,以及高值碳基化学品/油品合成等方面研究工作。获得2013年度北京大学青年教师教学比赛一等奖,2014年度王选青年学者奖,2017年中国催化青年奖,2017年度中国科学十大进展。国家自然科学基金委员优秀青年基金、杰出青年基金获得者。2016年入选英国皇家化学会会士(Fellow of Royal Society of Chemistry)2014-2017年担任英国皇家化学会Catalysis Science & Technology副主编; 目前担任Chinese Journal of ChemistryScience Bulletin副主编Journal of Energy Chemistry JouleACS CatalysisCatalysis Science & Technology等刊编委和顾问编委。

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.