No abstract

The effect of Rh addition upon catalyst characteristics and performance in methane steam reforming was investigated using Rh-promoted Ni/A1203 catalysts. The number of reduced metal atoms exposed on the surface increased for the Rh-promoted catalysts. Rh-promoted catalysts showed an increase in CI-h reforming activity; however, constant turnover frequencies for promoted and unpromoted catalysts suggest that the increase in the number of metal surface atoms caused the activity enhancement. Rh also facilitated reduction of Ni/A1203.

No abstract

To obtain insight into the effect of metal-support interactions in the CO 2 reforming of CH 4 , a series of alumina-supported nickel catalysts were prepared by calcination of the catalyst precursors in air at different temperatures. The increase in the intensity of Ni-Al 2 O 3 interactions with the calcination temperature was found to be unfavorable to the reduction of the catalyst. However, the catalyst with strong Ni-Al 2 O 3 interactions suppressed carbon deposition effectively, which can be attributed to the formation of spinel, NiAl 2 O 4 , after calcination. When the reaction was carried out at temperatures higher than 973 K, all the catalysts tended to exhibit equilibrium activity.