The role of catalyst support for ethanol steam reforming was studied using Rh as the active metal. Support identity rather than metal dispersion had significant effects on the activity with Rh/CeO2-ZrO2 exhibiting the best H2 yield among the catalysts studied. In a subsequent series of experiments, the CeO2-ZrO2 support pre-calcination and catalyst calcination temperatures were systematically varied to evaluate the metal-support interaction and the related effects on H2 yield. The support pre-calcination temperature was not a significant factor between 500° and 800°C despite the potential for sintering the CeO2 phase. Acetaldehyde was a reaction intermediate and easily underwent a decarbonylation to form CH4 and CO. Once CH4 formed, high temperatures were required to reform it into CO and H2. Therefore, to maximize H2 formation, the CH3 group (which is the precursor to CH4) needs to be oxidized with steam before CH4 is allowed to form. This is an abstract of a paper presented at the ACS Fuel Chemistry Meeting (Washington, DC Fall 2005).
|Number of pages||1|
|Journal||ACS Division of Fuel Chemistry, Preprints|
|Publication status||Published - 2005|
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