Cu/Fe/Al-LDHs的制备及其光催化还原CO2制备CH4研究

西安科技大学 化学与化工学院,陕西 西安 710054

二氧化碳; 类水滑石; 光催化; 甲烷

Preparation of Cu/Fe/Al-LDHs and photocatalytic reduction of CO2 to prepare CH4
KONG Ting-ting,ZHANG Ying-ping,ZHOU An-ning,ZHANG Dan

(College of Chemistry and Chemical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

CO2; LDHs; photocatalytic; CH4

DOI: 10.13800/j.cnki.xakjdxxb.2016.0115

备注

采用共沉淀法制备了Cu/Fe/Al-LDHs催化剂,并以Cu2+含量为影响因素,结合XRD,SEM, TG, UV以及FIR等方法对其进行表征。研究发现:不同摩尔比的Cu/Fe/Al-LDHs均为典型的层状结构半导体材料,且随着Cu2+含量的逐步增加,Jahn-Teller效应增强,Cu/Fe/Al-LDHs的结晶度下降。通过常温、常压下的催化剂对CO2(g)+H2O(g)光催化还原制CH4 的反应,验证了不同摩尔比的催化剂均具有光催化反应活性; 讨论了经过不同温度焙烧后的Cu/Fe/Al-LDHs的光催化活性,结果表明:焙烧后形成的CuFe2O4和CuAl2O4等混合氧化物的光催化性能更好,CH4产率更高。

Through the ratio of Cu2+ controlling,the catalysts of Cu/Fe/Al-LDHs were synthesized by co-precipitation method.It was characterized by XRD,SEM,TG,UV and FIR.With increasing ratio of Cu2+,the crystallinity of Cu/Fe/Al-LDHs was decreased,and the Jahn-Teller effect was enhanced.Through the photoreduction of CO2 with H2O vapor at room temperature and atmospheric pressure,verified all the moles ratios of catalysts were photocatalytic activities.Discussed the photocatalytic activity of calcination of Cu/Fe/Al-LDHs by different temperature.The result shown that the photocatalytic activity and the productivity of CH4 are improved by CuFe2O4 and CuAl2O4 that calcination by Cu/Fe/Al-LDHs.