镍盐前驱体对Ni/SBA-15催化剂上甲烷干重整反应性能的影响

Effect of Ni Precursors on the Performance of Ni/SBA-15 Catalysts for Methane Dry Reforming

摘要:

研究了不同镍盐前驱体（硝酸镍、乙酸镍和氯化镍）制备的Ni/SBA-15催化剂对甲烷干重整反应中催化性能的影响。与硝酸镍和氯化镍相比，以乙酸镍为前驱体制备的催化剂在不同反应温度条件下具有优异的催化活性，在700 篊条件下，经过20 h连续的稳定性测试，催化剂仍表现出良好的稳定性和选择性。利用N2吸附-脱附、XRD、XPS和H2-TPR等表征对催化剂结构、表面物种和还原性质等进行分析。结果表明，乙酸镍制备的Ni/SBA-15催化剂具有较低的NiO结晶度以及良好的分散度、优越的氧化还原性能和抗积碳性能。此外，活性组分Ni与载体SBA-15之间的相互作用有利于其良好的催化活性。

Abstract:

The catalytic properties of Ni/SBA-15 catalysts that prepared by different nickel precursors were studied for carbon dioxide methane dry reforming. The catalyst prepared by nickel acetate exhibited the best catalytic activity among the samples and the excellent stability and selectivity were obtained at 700篊 for 20 h. The structure, surface species and redox properties of the catalysts were investigated by N2 adsorption-desorption, XRD, H2-TPR and XPS techniques. The results indicated that the superior catalytic activity was ascribed to a lower crystallinity and the excellent redox ability. Besides, the interaction between metal (Ni) and support (SBA-15) was responsible for the outstanding performance.