CO_2和甲醇直接合成碳酸二甲酯的Fe-Zr-O催化剂制备和性能研究  

Preparation and Catalytic Performance of Fe-Zr-O Catalysts for Direct Synthesis of Dimethyl Carbonate Using CO_2 and Methanol

作　　者：陈红萍[1,2] 梁英华[2] 郑小满[2] 赵新强[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]河北联合大学化学工程学院,河北唐山063009

出　　处：《高校化学工程学报》2014年第4期745-751,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：河北省教育厅项目(2010133);唐山市科技局项目(09110202A-1-1)

摘　　要：采用共沉淀法制备的Fe-Zr-O催化剂对CO2与甲醇直接合成碳酸二甲酯（DMC）反应具有较高的催化活性，与其他制备方法比较具有催化活性高且可重复利用的特点。通过SEM、TEM和N2吸附．脱附的表征结果表明，所制备的催化剂粒径均匀，比表面积大，孔道直径集中在10～30nm，便于反应物和产物的扩散；XRD和XPS分析结果表明，铁锆之间发生了相互作用，铁的价态略有升高，使其所对应的L酸性增强，铁锆原子分别插入到对方氧化物晶格中，使氧化铁和氧化锆的晶型均发生改变。This study investigated the preparation and catalytic performance of Fe-Zr-O catalysts prepared byco-precipitation method. The prepared catalysts were used to directly synthesize the dimethyl carbonate （DMC）from methanol and carbon dioxide. The prepared catalyst shows higher catalytic activity than catalysts preparedby other methods and it is recyclable without the decrease of activity. The synthesized catalysts were fullycharacterized by SEM, TEM and N2-adsorption desorption. The results reveal that they have a uniformnano-scale particle size, large specific surface area, and mesoporous channels for mass transfer. XRD and XPSresults show that iron and zirconium interact with each other in the system, which increases the iron valencevalues and leads to the enhancement of corresponding Lewis acids. Iron and zirconium insert into their oxidelattices, which leads to the change of crystal structures of both Fe2O3 and ZrO3.

关 键 词：碳酸二甲酯 甲醇 CO2 铁锆复合氧化物 共沉淀 

分 类 号：TQ426.62[化学工程] O643.36[理学—物理化学]