Relevance of the Co1−xNixWO4 wolframite-type mixed oxide compositions on the synthesis and catalytic properties of W-based carbides

A series of wolframite-type oxides (Co1−xNixWO4) with various compositions was prepared by urea-matrix combustion method and subsequently carburized using temperature-programmed reaction. The carbide catalysts were active for the pyridine HDN reaction. The HDN active phase presents in CoWCx is different than that presents in the Ni-containing catalysts. .