Synergistic Catalysis between Pd and Fe in Gas Phase Hydrodeoxygenation of m-Cresol
详细信息 查看全文
- 作者：Yongchun Hong ; He Zhang ; Junming Sun ; Karim M. Ayman ; Alyssa J. R. Hensley ; Meng Gu ; Mark H. Engelhard ; Jean-Sabin McEwen ; Yong Wang
- 刊名：ACS Catalysis
- 出版年：2014
- 出版时间：October 3, 2014
- 年：2014
- 卷：4
- 期：10
- 页码：3335-3345
- 全文大小：589K
- ISSN：2155-5435
文摘
In this work, a series of Pd/Fe2O3 catalysts were synthesized, characterized, and evaluated for the hydrodeoxygenation (HDO) of m-cresol. It was found that the addition of Pd remarkably promotes the catalytic activity of Fe while the product distributions resemble that of monometallic Fe catalyst, showing high selectivity toward the production of toluene (C鈥揙 cleavage without saturation of aromatic ring and C鈥揅 cleavage). Reduced catalysts featured with Pd patches on the top of reduced Fe nanoparticle surface, and the interaction between Pd and Fe, was further confirmed using X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and X-ray absorption near edge fine structure (XANES). A possible mechanism, including Pd assisted H2 dissociation and Pd facilitated stabilization of the metallic Fe surface as well as Pd enhanced product desorption, is proposed to be responsible for the high activity and HDO selectivity in Pd鈥揊e catalysts. The synergic catalysis derived from Pd鈥揊e interaction found in this work was proved to be applicable to other precious metal promoted Fe catalysts, providing a promising strategy for future design of highly active and selective HDO catalysts.