Yg. Chen et J. Ren, CONVERSION OF METHANE AND CARBON-DIOXIDE INTO SYNTHESIS GAS OVER ALUMINA-SUPPORTED NICKEL-CATALYSTS - EFFECT OF NI-AL2O3 INTERACTIONS, Catalysis letters, 29(1-2), 1994, pp. 39-48
A series of alumina-supported nickel catalysts were prepared by calcin
ation of the catalyst precursors in air at different temperatures. The
increase in the intensity of Ni-Al2O3 interactions with the calcinati
on temperature was found to be unfavourable to the reduction of the ca
talyst, and thus caused a decrease in activity for the low temperature
reaction between methane and carbon dioxide. However, the catalyst wi
th strong Ni-Al2O3 interactions suppressed carbon deposition effective
ly, which can be attributed to the formation of spinel, NiAl2O4, after
calcination. When the reaction was carried out at 1023 K, all the cat
alysts tended to exhibit the same activity. At the same time, only fil
amentous carbon with a hollow inner channel was observed and there wer
e nickel particles on the tip of this filamentous carbon.