Nano-structured nickel-molybdenum carbide catalyst for low-temperature water-gas shift reaction

作者：Nagai Masatoshi^*; Zahidul Amin Md; Matsuda Kenji

来源：Applied Catalysis A: General , 2006, 313(2): 137-145.

DOI：10.1016/j.apcata.2006.07.006

• Ni-Mo
• carbide
• water-gas shift
• low temperature
• XRD
• XPS
• TPC

The water-gas shift (WGS) reaction over nickel-molybdenum (Ni-Mo) carbide catalysts was investigated at 453 K. The oxide precursors and the carburized catalysts were characterized based on the adsorption of N-2 and CO, XRD, high-resolution tunnel electron microscopy (HRTEM), temperature-programmed reaction with 20% CH4/H-2 or with He, and X-ray photoelectron spectroscopy. The 873 K-carburized Ni0.25Mo0.75 catalyst (Ni0.25Mo0.75C-873) exhibited the highest rate of CO conversion among the catalysts carburized at 823, 923, and 973 K with various Ni contents. The Ni0.25Mo0.75C-873 catalyst contained beta-Mo2C and amorphous Ni-Mo oxycarbide (NiMOC3.6O1.4) which turned to Ni6Mo6C after being heated under flowing He. The TEM image showed that Ni0.25Mo0.75C-873 consisted of Ni particles dispersed on plate-like sheets of beta-Mo2C and amorphous Ni-Mo carbides.

• 出版日期2006-10-4