Iso-octane partial oxidation over Ni-Sn/Ce0.75Zr0.25O2 catalysts

FUEL 27

Vissanu Meeyoo, vissanu@mut.ac.th1, Sitthiphong Pengpanich, sitthiph@mut.ac.th1, Thirasak Rirksomboon, rthirasa@chula.ac.th2, and Johannes Schwank3. (1) Centre for Advanced Materials and Environmental Research, Mahanakorn University of Technology, 51 Cheum-Sampan Rd., Nong Chok, Bangkok, 10530, Thailand, (2) Petrochemical Technology, The Petroleum and Petrochemical College, Chulalongkorn University, Phya Thai Road, Chula Soi 12, Patumwan, Bangkok, 10330, Thailand, (3) Department of Chemical Engineering, University of Michigan, 2300 Hayward St., 3074 H.H. Dow Building, Ann Arbor, MI 48109-2136
In this study, Ni/Ce0.75Zr0.25O2 catalyst was doped with different amounts of Sn by co-impregnation method. The catalysts were characterized by BET, H2 chemisorption, XRD, TPR, TEM, XPS and tested for iso-octane partial oxidation to produce hydrogen in the temperature range of 300-700oC at atmospheric pressure. The results showed that Sn species were present on the surface of Ni particles, but did not modify the bulk properties of the support. Addition of a small amount of Sn (< 1 wt%) lowered the catalytic activity for iso-octane partial oxidation by less than 5% while the extent of carbon deposition was decreased by more than 50%. However, Sn loadings higher than 1 wt% caused a massive drop in catalytic activity. This indicates that as long as the Ni surface is only partially covered with Sn species, the active sites for the partial oxidation of iso-octane remain intact, while the surface site ensembles required for carbon formation are blocked.
 

Fuel Processing for Hydrogen Production: Reforming of Hydrocarbon Fuels
1:25 PM-5:20 PM, Sunday, August 19, 2007 Boston Park Plaza -- Berkeley Rm, Oral

Division of Fuel Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007