TiO<sub>2</sub>-Supported Perovskite-Induced Bimetallic Ni–Co Nanoparticles for the Dry Reforming of Methane
Li Qiu, Yani Ning, Yuxin Kang, Yujiao Mao, Sha Li, Xiaoliang Yan
Abstract
Design of Ni catalysts with carbon resistance by well diminishing the carbon deposition rate remains a great challenge for dry reforming of methane (DRM). Herein, Ni 1– x Co x bimetallic ( x = 0.1, 0.2) catalysts were prepared by the impregnation method. In-situ XRD was used to reveal the transformation from precursor TiC to NiTiO 3 /TiO 2 and Ni 1– x Co x TiO 3 /TiO 2 ( x = 0.1, 0.2) with perovskite structure during calcination at 700 °C. Compared to monometallic Ni/TiO 2 after reduction, Ni 0.8 Co 0.2 /TiO 2 and Ni 0.9 Co 0.1 /TiO 2 after subsequent reduction exhibited higher initial catalytic activity. Furthermore, Ni 0.9 Co 0.1 /TiO 2 possessed superior stability with CH 4 and CO 2 conversions of 30% and 46%, respectively, in comparison with the decline of catalytic performance on Ni 0.8 Co 0.2 /TiO 2 in DRM at 700 °C for 10 h. The main origin for the enhanced stability on the former catalyst was originated from no carbon deposition, as evidenced by the restricted CH 4 dissociation at 503 °C and the promoted CO 2 activation via more available oxygen vacancies on bimetallic Ni 0.9 Co 0.1 /TiO 2 .