铜锌掺杂的六铝酸盐分解N2O催化性能研究

采用共沉淀法制备了Cu和Zn取代六铝酸盐（LaCu_xZn_1-xAl₁₁O_19-δ，x=0、0.2、0.4、0.5、0.6、0.8、1.0）催化剂，通过XRD和BET等技术对催化剂进行表征，利用微型固定床反应器考察催化剂对N₂O的分解活性。结果表明，以(NH₄)₂CO₃为沉淀剂制备的催化剂在1 200 ℃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⁺进入六铝酸盐晶体结构。LaCu_xZn_1-xAl₁₁O_19-δ催化剂对N₂O分解有较好的催化活性，其中，LaCu_0.8Zn_0.2Al₁₁O_19-δ活性较好。在LaCu_xZn_1-xAl₁₁O_19-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，但由于六铝酸盐的特殊结构，Zn在催化剂中的作用较小。

N2O decomposition over Cu and Zn doped hexaaluminate catalysts

Cu, Zn doped hexaaluminates(LaCu_xZn_1-xAl₁₁O_19-δ, x=0, 0.2, 0.4, 0.5, 0.6, 0.8,1.0) were prepared by co precipitation method and tested for catalytic decomposition of N₂O in a miniature fixed bed reactor. Their structure and physicochemical properties were characterized by means of XRD and BET. The results showed that the catalyst prepared using (NH₄)₂CO₃ as precipitation agent had good hexaaluminate phase after calcinations at 1 200 ℃ for 4 h. Cu and Zn were incorporated into the hexaaluminate lattice via good synergic effect. LaCu_0.8Zn_0.2Al₁₁O_19-δ exhibited better catalytic activity for N₂O decomposition, with Cu as the active component and Zn as the stabilizing component. Zn had little effect on the catalyst activity due to inherent stability of hexaaluminates.