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Precious Metal Promoted Fe Catalysts for Hydrodeoxygenation of Phenolics--十周年报告27

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    陕师大化工学院

应用表面与胶体化学教育部重点实验室

成立十周年学术报告

(第 27 号)

报告题目:Precious Metal Promoted Fe Catalysts for Hydrodeoxygenation of Phenolics

报告人:王勇 教授

Washington State UniversityandPacific Northwest National Laboratory (PNNL)

主持人:刘忠文 教授

报告时间:20171013 上午9:00

报告地点:致知楼1568

报告人简介:

1993年获美国华盛顿州立大学(WSU)化学工程博士。现任美国太平洋西北国家实验室(PNNLFellowWSU终身杰出讲座教授,厦门大学(短期)特聘教授。Fellow of AAAS (美国科学进步学会),ACS(美国化学学会),AIChE(美国化学工程师协会)RSC(皇家化学学会)和NAI(美国国家发明家科学院)。获得年度美籍亚裔最佳工程师奖,美国总统绿色化学奖等。王勇教授的研究方向是化石和生物质的高效清洁转化,发表论文250篇(H=61,引用>16000),授权专利260项(包括105项美国授权专利)。

报告摘要:

It remains challenging to efficiently remove oxygen from bio-oil (O% = 10-30 wt%) to produce fuels with much lower oxygen content (< 2 wt%). Catalytic hydrodeoxygenation (HDO) is an effective and widely adopted strategy for O removal from bio-oil. In this work, a series of Pd-Fe (Pd% = 0.1-5 wt%) and M-Fe (M% =1 wt%, M = Ni, Pt, Ru, Rh) catalysts were studied.  We found that the Pd-Fe bimetallic catalyst notably promotes the benzene yield (C-O cleavage) in HDO of guaiacol, compared with its monometallic counterparts. DFT calculations indicated Fe as active sites while Pd addition facilitated desorption of benzene.  In addition, the reduced Pd-Fe catalysts were found to be featured with Pd entities sitting on the top of reduced Fe surface, as revealed by STEM, XPS and EXAFS. TPR results showed that the addition of Pd significantly facilitates the reduction of Fe2O3, due to the interaction between Pd with oxygen in Fe2O3, which lowers the energy required for oxygen stripping. The addition of other metals remarkably promoted the activity of Fe for HDO of m-cresol in the order of Ni < Pd < Pt < Ru < Rh, resembling with the order of sticking probability of H2. In addition, the M-Fe catalysts showed similar selectivity as Fe with high toluene selectivity (C-O cleavage), while precious metals and Ni themselves showed higher C-C cleavage. A mechanism including dopant facilitated H2 dissociation and desorption of aromatic products was proposed for the observed synergy, providing a potential strategy for future innovations in HDO catalysis.

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