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采用共沉淀法制备Cu和Zn取代的六铝酸盐(LaCuxZn1-xAl11O19-δ,x为0,0.2,0.4,0.5,0.6,0.8,1)催化剂,考察了催化剂对N2O的分解活性.结果表明,在1200℃焙烧4 h可以形成完整的六铝酸盐晶型,Cu和Zn能够取代Al3+很好地促进六铝酸盐晶体结构的形成;LaCuxZn1-xAl11O19-δ催化剂对N2O分解有很好的催化活性,其中LaCu0.8Zn0.2Al11O19-δ活性最好.在LaCuxZn1-xAl11O19-δ六铝酸盐中,Cu为N2O催化分解的主要活性元素,Zn有助于提高催化剂的稳定性,但Zn在催化剂中的作用很小.
Cu and Zn-substituted hexaaluminates (LaCuxZn1-xAl11O19-δ, x = 0,0.2,0.4,0.5,0.6,0.8,1) were prepared by coprecipitation method, and the decomposition activity of the catalysts on N2O was investigated. , Calcined at 1200 ℃ for 4 h can form a complete hexaaluminate crystal form, Cu and Zn can replace Al3 + well promote the formation of hexaaluminate crystal structure; LaCuxZn1-xAl11O19-δ catalyst has a good N2O decomposition The catalytic activity of LaCu0.8Zn0.2Al11O19-δ was the best.In the LaCuxZn1-xAl11O19-δ hexaaluminate, Cu is the main active element for the catalytic decomposition of N2O. Zn can help to improve the stability of the catalyst. However, Zn The role of the catalyst is small.