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用溶胶凝胶法制备了一组NixCo1-xCoAlO4尖晶石型复合氧化物,并采用表面润湿浸渍K2CO3溶液进行了K掺杂改性,用于有氧气氛下的N2O催化分解反应。采用N2物理吸附、X-射线衍射(XRD)、扫描电镜(SEM)、H2-程序升温还原(H2-TPR)等技术对催化剂进行了表征,考察了催化剂组成、母液pH值、K负载量等制备参数对其催化活性的影响。结果表明,母液pH值为3、K/(Ni+Co)物质的量比为0.1的K/Ni0.15Co0.85CoAlO4催化剂具有较高的N2O分解活性,450℃N2O可完全分解。助剂K的加入弱化了催化剂表面金属氧键,提高了催化剂的还原性、催化活性和抗水性。
A series of NixCo1-xCoAlO4 spinel composite oxides were prepared by sol-gel method. K-doped modified K2CO3 solution was applied to wet-impregnate K2CO3 solution for the catalytic decomposition of N2O under an aerobic atmosphere. The catalysts were characterized by N2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM) and H2-temperature programmed reduction (H2-TPR). The effects of catalyst composition, pH value of mother liquor, Influence of preparation parameters on its catalytic activity. The results show that K / Ni0.15Co0.85CoAlO4 catalyst with high pH value of 3 and K / (Ni + Co) ratio of 0.1 has high N2O decomposition activity and can be completely decomposed at 450 ℃. The addition of auxiliary K weakens the oxygen bond of metal on the surface of the catalyst and improves the reducibility, catalytic activity and water resistance of the catalyst.