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采用改良的粉末混合法制备了系列经过其它金属氧化物改性的NiO/Al2O3催化剂,并运用X射线衍射、透射电子显微镜、N2低温物理吸附-脱附、程序升温还原、程序升温脱附、拉曼以及X射线光电子能谱对催化剂进行了表征.结果显示,在300~700oC经MgO修饰的NiO/Al2O3催化剂上CO甲烷化反应活性比NiO/ZrO2-Al2O3和NiO/SiO2-Al2O3的高.另一金属氧化物的加入削弱了NiO/Al2O3催化剂中Ni-Al间相互作用,形成更多的活性Ni物种,从而促进了反应的进行.
A series of NiO / Al2O3 catalysts modified by other metal oxides were prepared by a modified powder mixing method. X-ray diffraction, transmission electron microscopy, N2 low temperature physical adsorption-desorption, temperature programmed reduction, temperature programmed desorption, Mannich and X-ray photoelectron spectroscopy were used to characterize the catalysts. The results showed that the CO methanation reactivity was higher than that of NiO / ZrO2-Al2O3 and NiO / SiO2-Al2O3 at 300 ~ 700oC on the MgO-modified NiO / Al2O3 catalyst. The addition of a metal oxide weakens the Ni-Al interaction in the NiO / Al2O3 catalyst to form more active Ni species, thus promoting the reaction.