Bimetallic Pd-Cu catalysts for selective CO2 hydrogenation to methanol
发布时间：2019-03-09
点击次数：
- 论文类型：
- 期刊论文
- 发表时间：
- 2015-07-01
- 发表刊物：
- APPLIED CATALYSIS B-ENVIRONMENTAL
- 收录刊物：
- Scopus、EI、SCIE
- 文献类型：
- J
- 卷号：
- 170
- 页面范围：
- 173-185
- ISSN号：
- 0926-3373
- 关键字：
- CO2 hydrogenation; Pd-Cu bimetallic catalyst; Methanol; Pd-Cu alloy formation; Support effect
- 摘要：
- This paper reports on novel Pd-Cu bimetallic catalysts for selective CO2 hydrogenation to methanol. Strong synergistic effect on promoting methanol formation was observed over amorphous silica supported Pd-Cu bimetallic catalysts when the Pd/(Pd + Cu) atomic ratios lied in the range of 0.25-0.34. The methanol formation rate over Pd(0.25)-Cu/SiO2 was two times higher than the simple sum of those over monometallic Cu and Pd catalysts. The Pd-Cu bimetallic catalysts were characterized by X-ray diffraction, transmission electron microscopy, scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and hydrogen temperature-programmed desorption. Detailed characterization results demonstrated the importance of two well-dispersed Pd-Cu alloy particles (PdCu and PdCu3) for the observed methanol promotion over Pd-Cu bimetallic catalysts. Similar bimetallic promotion was also observed for Pd-Cu catalysts supported on uniform mesoporous MCM-41, SBA-15 and MSU-F. Conversion-selectivity profile of the Pd-Cu/SiO2 catalyst suggested that CO2 was a primary carbon source for methanol synthesis at lower CO2 conversion, and byproduct CO contributed at higher CO2 conversion within the conversion range examined. (C) 2015 Elsevier B.V. All rights reserved.
- 第一作者
- Jiang, Xiao
- 合写作者
- Song, Chunshan,Koizumi, Naoto,Guo, Xinwen
- 通讯作者
- Song, CS (reprint author), Penn State Univ, EMS Energy Inst, PSU DUT Joint Ctr Energy Res, Clean Fuels & Catalysis Program, 209 Acad Projects Bldg, University Pk, PA 16802 USA.