Low temperature water-gas shift catalysts

Catalysis ◽  
2008 ◽  
pp. 122-285 ◽  
Author(s):  
G. Jacobs ◽  
B. H. Davis
Keyword(s):  
Low Temperature ◽  
Water Gas Shift ◽  
Water Gas ◽  
Temperature Water

scholarly journals Low Temperature Water-Gas Shift: Enhancing Stability through Optimizing Rb Loading on Pt/ZrO2

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 210
Author(s):  
Caleb Daniel Watson ◽  
Michela Martinelli ◽  
Donald Charles Cronauer ◽  
A. Jeremy Kropf ◽  
Gary Jacobs
Keyword(s):  
Low Temperature ◽  
Hydrogen Transfer ◽  
Water Gas Shift ◽  
Significant Shift ◽  
Catalyst Activation ◽  
X Ray ◽  
Temperature Programmed ◽  
Water Gas ◽  
X Ray Absorption ◽  
Temperature Water

Recent studies have shown that appropriate levels of alkali promotion can significantly improve the rate of low-temperature water gas shift (LT-WGS) on a range of catalysts. At sufficient loadings, the alkali metal can weaken the formate C–H bond and promote formate dehydrogenation, which is the proposed rate determining step in the formate associative mechanism. In a continuation of these studies, the effect of Rb promotion on Pt/ZrO2 is examined herein. Pt/ZrO2 catalysts were prepared with several different Rb loadings and characterized using temperature programmed reduction mass spectrometry (TPR-MS), temperature programmed desorption (TPD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), an X-ray absorption near edge spectroscopy (XANES) difference procedure, extended X-ray absorption fine structure spectroscopy (EXAFS) fitting, TPR-EXAFS/XANES, and reactor testing. At loadings of 2.79% Rb or higher, a significant shift was seen in the formate ν(CH) band. The results showed that a Rb loading of 4.65%, significantly improves the rate of formate decomposition in the presence of steam via weakening the formate C–H bond. However, excessive rubidium loading led to the increase in stability of a second intermediate, carbonate and inhibited hydrogen transfer reactions on Pt through surface blocking and accelerated agglomeration during catalyst activation. Optimal catalytic performance was achieved with loadings in the range of 0.55–0.93% Rb, where the catalyst maintained high activity and exhibited higher stability in comparison with the unpromoted catalyst.

Low temperature water–gas shift: comparison of thoria and ceria catalysts

2004 ◽  
Vol 267 (1-2) ◽  
pp. 27-33 ◽  
Author(s):  
Gary Jacobs ◽  
Adam Crawford ◽  
Leann Williams ◽  
Patricia M Patterson ◽  
Burtron H Davis
Keyword(s):  
Low Temperature ◽  
Water Gas Shift ◽  
Ceria Catalysts ◽  
Water Gas ◽  
Temperature Water

Low temperature water-gas shift: kinetic isotope effect observed for decomposition of surface formates for Pt/ceria catalysts

2004 ◽  
Vol 269 (1-2) ◽  
pp. 63-73 ◽  
Author(s):  
Gary Jacobs ◽  
Patricia M. Patterson ◽  
Uschi M. Graham ◽  
Dennis E. Sparks ◽  
Burtron H. Davis
Keyword(s):  
Low Temperature ◽  
Isotope Effect ◽  
Kinetic Isotope Effect ◽  
Water Gas Shift ◽  
Kinetic Isotope ◽  
Ceria Catalysts ◽  
Water Gas ◽  
Temperature Water

scholarly journals Pre-Reduction of Au/Iron Oxide Catalyst for Low-Temperature Water-Gas Shift Reaction Below 150 °C

Catalysts ◽  
2011 ◽  
Vol 1 (1) ◽  
pp. 175-190 ◽  
Author(s):  
Shinji Kudo ◽  
Taisuke Maki ◽  
Takashi Fukuda ◽  
Kazuhiro Mae
Keyword(s):  
Iron Oxide ◽  
Low Temperature ◽  
Oxide Catalyst ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Iron Oxide Catalyst ◽  
Shift Reaction ◽  
Water Gas ◽  
Temperature Water

A crucial role for the CeO2–ZrO2 support for the low temperature water gas shift reaction over Cu–CeO2–ZrO2 catalysts

2015 ◽  
Vol 5 (7) ◽  
pp. 3706-3713 ◽  
Author(s):  
Dae-Woon Jeong ◽  
Hyun-Suk Na ◽  
Jae-Oh Shim ◽  
Won-Jun Jang ◽  
Hyun-Seog Roh
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Crucial Role ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Shift Reaction ◽  
Water Gas ◽  
Temperature Water

The catalytic activity of Cu based catalysts is correlated to its amount of defect oxygen which strongly depends on the ratio of CeO2–ZrO2.

scholarly journals Atomic-layered Au clusters on α-MoC as catalysts for the low-temperature water-gas shift reaction

Science ◽  
2017 ◽  
Vol 357 (6349) ◽  
pp. 389-393 ◽  
Author(s):  
Siyu Yao ◽  
Xiao Zhang ◽  
Wu Zhou ◽  
Rui Gao ◽  
Wenqian Xu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Au Clusters ◽  
Shift Reaction ◽  
Water Gas ◽  
Temperature Water
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