K-Ce改性类水滑石前驱体Co-M—Al复合氧化物催化分解N2O

N2O Decomposition over K-Ce Promoted Co-M-AI Mixed Oxide Catalysts Prepared from Hydrotalcite-like Precursors

采用共沉淀法制备不同组分类水滑石前驱体Co-M—Al和Co—M—Ce—Al（M=Zn，Ni，Cu）复合氧化物催化剂催化分解N2O．结果表明，Co—M—Al系列氧化物催化剂的催化活性Co—Ni-Al系列〉Co—Zn-Al系列〉Co—Cu-Al系列；CeO2添加使得催化剂催化活性进一步提高，N20分解温度T50和马0均下降80℃；继续负载碱金属K也使氧化物催化剂催化活性提高，N2O分解温度T50和T90下降约50℃.

A series of mixed oxide catalysts with different composition of Co-M-Al and Co-M-Ce- Al （M=Zn, Ni, Cu） were prepared by co-precipitation method from hydrotalcite-like compounds. The experimental results revealed the catalytic activity of Co-Ni-Al is slightly higher than that of Co-Zn-Al and much higher than that of Co-Cu-Al for direct decomposition of N2O. Moreover, addition of small amounts of Ce02 improved the catalytic activity signif- icantly and made the decomposition temperatures at which the N2O conversion was 50% and 90% （T50 and Tgo） both decreased 80 ℃ than those of Co-M-Al catalysts without CeO2 added. Further, potassium-load also promoted the catalytic activity, and the decomposi- tion temperatures of T50 and T90 both decreased approximately 50 ℃. It is significant for decomposing N2O from industries and reducing carbon emission from atmosphere.