New catalysts for the syngas production obtained by hydrotalcite type precursor containing silicate

摘要

Catalysts with innovative structure were obtained by HT precursor prepared using silicate as interlayer anion. The calcined catalysts showed two phases: a mixed oxide type structure and a new M-silicate structure, where the cations of the active metal are partially soluted. The Rh catalyst prepared by HT silicate was more active and selective than the one prepared by CO_3~(2-). The Rh_(0.15)/Ni_8/Mg_(60)/Al_(31.85) showed the most interesting result in terms of syngas yield and it was tested in a pilot plant. The tests confirmed its high activity and stability even after 18 days of time-on-stream. The amount of the Rh_(0.15)/Ni_8/Mg_(60)/Al_(31.85) loaded catalyst was reduced down to 0.1 g without any change of activity, improving the possibilities of an application in the low residence time processes.