CO2 hydrogenation on a metal hydride surface

The catalytic hydrogenation of CO 2 at the surface of a metal hydride and the corresponding surface segregation were investigated. The surface processes on Mg 2NiH 4 were analyzed by in situ X-ray photoelectron spectroscopy (XPS) combined with thermal desorption spectroscopy (TDS) and mass spectrometry (MS), and time-of-flight secondary ion mass spectrometry (ToF-SIMS). CO 2 hydrogenation on the hydride surface during hydrogen desorption was analyzed by catalytic activity measurement with a flow reactor, a gas chromatograph (GC) and MS. We conclude that for the CO 2 methanation reaction, the dissociation of H 2 molecules at the surface is not the rate controlling step but the dissociative adsorption of CO 2 molecules on the hydride surface. © the Owner Societies 2012.


Published in:
Physical Chemistry Chemical Physics, 14, 16, 5518-5526
Year:
2012
ISSN:
1463-9076
Note:
Times Cited: 2
Laboratories:




 Record created 2015-03-03, last modified 2018-03-17


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