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New wolframite-type oxides (Co1−xNixWO4) with various compositions have been prepared by a combustion method and carburized using a temperatureprogrammed reaction. Catalytic performance was evaluated in a continuous flow reactor using pyridine hydrodenitrogenation (HDN) as the model reaction. The carbide phase composition is markedly affected by the atomic ratio (i.e., Ni / Ni + Co). The mixed Co, Ni and W carbides are active catalysts for pyridine HDN reaction; however, they undergo deactivation due to graphitic carbon deposition and segregation.