Low Temperature Water–Gas Shift/Methanol Steam Reforming: Alkali Doping to Facilitate the Scission of Formate and Methoxy C–H Bonds over Pt/ceria Catalyst

2007 ◽  
Vol 122 (1-2) ◽  
pp. 9-19 ◽  
Author(s):  
Harold N. Evin ◽  
Gary Jacobs ◽  
Javier Ruiz-Martinez ◽  
Uschi M. Graham ◽  
Alan Dozier ◽  
...  
Keyword(s):  
Low Temperature ◽  
Steam Reforming ◽  
Water Gas Shift ◽  
Methanol Steam Reforming ◽  
Alkali Doping ◽  
Water Gas ◽  
Temperature Water

Low temperature water–gas shift: The effect of alkali doping on the CH bond of formate over Pt/ZrO2 catalysts

2007 ◽  
Vol 328 (1) ◽  
pp. 14-26 ◽  
Author(s):  
John M. Pigos ◽  
Christopher J. Brooks ◽  
Gary Jacobs ◽  
Burtron H. Davis
Keyword(s):  
Low Temperature ◽  
Water Gas Shift ◽  
Alkali Doping ◽  
Water Gas ◽  
Temperature Water

Low Temperature Water–Gas Shift: Alkali Doping to Facilitate Formate C–H Bond Cleaving over Pt/Ceria Catalysts—An Optimization Problem

2007 ◽  
Vol 120 (3-4) ◽  
pp. 166-178 ◽  
Author(s):  
Harold N. Evin ◽  
Gary Jacobs ◽  
Javier Ruiz-Martinez ◽  
Gerald A. Thomas ◽  
Burtron H. Davis
Keyword(s):  
Low Temperature ◽  
Optimization Problem ◽  
Water Gas Shift ◽  
Alkali Doping ◽  
Ceria Catalysts ◽  
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
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