Photodesorption from low-temperature water ice in interstellar and circumsolar grains

Nature ◽  
1995 ◽  
Vol 373 (6513) ◽  
pp. 405-407 ◽  
Author(s):  
M. S. Westley ◽  
R. A. Baragiola ◽  
R. E. Johnson ◽  
G. A. Baratta
Keyword(s):  
Low Temperature ◽  
Water Ice ◽  
Temperature Water

The effect of microwave-frequency discharge-activated oxygen on the microscale structure of low-temperature water ice films

2009 ◽  
Vol 131 (22) ◽  
pp. 224706
Author(s):  
Skye R. Doering ◽  
Kirsten M. Strobush ◽  
Jochen Marschall ◽  
James E. Boulter
Keyword(s):  
Low Temperature ◽  
Microwave Frequency ◽  
Water Ice ◽  
Activated Oxygen ◽  
Ice Films ◽  
Temperature Water

Low-energy(5–250eV)electron-stimulated desorption ofH+,H2+, andH+(H2O)nfrom low-temperature water ice surfaces

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
Janine Herring-Captain ◽  
Gregory A. Grieves ◽  
Alex Alexandrov ◽  
Matthew T. Sieger ◽  
Haiyan Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Energy ◽  
Water Ice ◽  
Ice Surfaces ◽  
Electron Stimulated Desorption ◽  
Temperature Water

Production of O2 on icy satellites by electronic excitation of low-temperature water ice

Nature ◽  
10.1038/29015 ◽  
1998 ◽  
Vol 394 (6693) ◽  
pp. 554-556 ◽  
Author(s):  
M. T. Sieger ◽  
W. C. Simpson ◽  
T. M. Orlando
Keyword(s):  
Low Temperature ◽  
Electronic Excitation ◽  
Icy Satellites ◽  
Water Ice ◽  
Temperature Water

Probing the Interaction of Hydrogen Chloride with Low-Temperature Water Ice Surfaces Using Thermal and Electron-Stimulated Desorption

2011 ◽  
Vol 115 (23) ◽  
pp. 5936-5942 ◽  
Author(s):  
Babajide O. Olanrewaju ◽  
Janine Herring-Captain ◽  
Gregory A. Grieves ◽  
Alex Aleksandrov ◽  
Thomas M. Orlando
Keyword(s):  
Low Temperature ◽  
Hydrogen Chloride ◽  
Water Ice ◽  
Ice Surfaces ◽  
Electron Stimulated Desorption ◽  
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.

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