期刊
JOURNAL OF CATALYSIS
卷 278, 期 1, 页码 123-132出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.11.023
关键词
Water gas shift; Pt-Na/TiO2; Platinum; Titania; Sodium; Hydrogen; Strong metal-promoter interaction
资金
- SEMGREEN, LP
Sodium (1-10 wt.%)-promoted 1 wt.% Pt/TiO2 catalysts were prepared by a co-impregnation method and tested for the water gas shift (WGS) reaction under differential reaction conditions. Significantly higher intrinsic activity is achieved with 2-4 wt.% Na addition, when 2-4 layers of NaOx are deposited on the support and the Pt particles are partially covered by NaOx, with moderate surface basicity and exposed Pt surface areas. In addition to the physical coverage, XPS data suggest that interactions between Pt and NaOx may occur by Pt electron donation to O in NaOx through Pt-O-Na. The strong metal-promoter interactions provide highly active sites for the WGS reaction at the periphery of the Pt-NaOx interface and also inhibit Pt particles from sintering. Optimal 4 wt.% Na (Na/Pt = 34) improves the intrinsic reaction rate and turnover frequency of Pt/TiO2 at 300 degrees C by 8 and 11 times, respectively, and appears to be significantly higher than reported in the literature. The catalysts were characterized by X-ray diffraction, N-2 adsorption, CO chemisorption, transmission electron microscopy, H-2 temperature-programmed reduction. CO2 temperature-programmed desorption, and X-ray photoelectron spectroscopy. (C) 2010 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据