High Au concentration supported on ZnO: The role of water, pretreatments, stability and preparation procedures

PETR 137

Katia R. Souza, katiars@int.gov.br, Ana P. M. G. Barandas, barandas@terra.com.br, Alexandre B. Gaspar, and Lucia Gorenstin Appel, appel@uol.com.br. Laboratório de Catálise, Divisão de Catálise e Processos Químicos, Instituto Nacional de Tecnologia, Av. Venezuela, 82 sala 518, Rio de Janeiro, RJ, 20.081-312, Brazil
High gold concentration catalyst could be very relevant for small PROX reactors. However, in the literature there is very little information about this subject. Therefore, this study reports the results related to preparation procedures, role of water, pretreatments and stability of high gold concentration catalysts supported on ZnO. The catalysts were prepared by deposition-precipitation and coprecipitation using HAuCl4 and Na2CO3. These samples were analyzed by DRIFTS, XRD, O2 chemisorption. It was verified that pretreatments and moisture can change the surface carbonate and gold species. It was also observed that is feasible to synthesize high gold concentration systems although they are not stable for long periods.

 

Fuel Processing for Hydrogen Production
1:30 PM-5:00 PM, Wednesday, 13 September 2006 Palace -- Presidio Room, Oral

Division of Petroleum Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006