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应用程序升温还原、热重分析、X光衍射分析及活性评价等方法,研究了稀土低镍催化剂的还原过程,找出影响氧化镍还原度的主要因素是温度。高温还原可使催化剂得到较高的还原镍量,但低温还原仍可得到满意的活性和较好的抗积炭性能。稀土低镍催化剂中各组份间存在不同形式的相互作用,稀土化合物与镍的相互作用能提高催化剂的抗积炭性能和制氢选择性;NiO与MgO能形成固溶体,使NiO还原困难, 但还原后其活性和寿命均有所提高;一部份NiO与Al_2O_3可能形成镍铝尖晶石,它需要更高的还原温度。
Temperature reduction, thermogravimetric analysis, X-ray diffraction analysis and activity evaluation methods were used to study the reduction process of rare earth low nickel catalyst. The main factor to determine the reduction degree of nickel oxide was temperature. High temperature reduction can make the catalyst get a higher reduction of nickel, but the low temperature reduction can still be satisfied with the activity and better anti-carbon performance. Rare earth nickel catalysts have different forms of interaction between the various components, the interaction of rare earth compounds and nickel can improve the catalyst resistance to carbon deposition and hydrogen production selectivity; NiO and MgO can form solid solution NiO reduction difficult, but After reduction, its activity and life expectancy are improved; part of NiO and Al 2 O 3 may form nickel aluminum spinel, which requires a higher reduction temperature.