掺杂离子的种类对介孔La_(0.6)A_(0.4)NiO_3钙钛矿催化剂的结构与催化活性的影响  

Structure and catalytic activity of mesoporous La_(0.6)A_(0.4)NiO_3 perovskite catalyst with A-site ions replaced

作　　者：张晓华[1,2] 李凝[1] 滕俊江[1] 张荣斌[2] 

机构地区：[1]广东石油化工学院,广东茂名525000 [2]南昌大学化学学院,江西南昌330031

出　　处：《化工进展》2016年第11期3542-3548,共7页Chemical Industry and Engineering Progress

基　　金：广东省人才引进项目(粤财教[2013]247号);广东石油化工学院人才引进项目

摘　　要：以十六烷基三甲基溴化铵(CTAB)为模板剂,用共沉淀法分别制备了介孔La_(0.6)A_(0.4)Ni O_3(A=Ce、Sr、Y、Nd、Pr)钙钛矿复合氧化物,用XRD、SEM、FTIR、BET和程序升温技术等对复合氧化物的晶相结构、表面形貌、表面积、孔径分布及表面性能等进行了表征,同时在蔗渣高压液化反应中探讨了A位离子掺杂种类对介孔La_(0.6)A_(0.4)Ni O_3催化活性和液化产物分布及液化油含量的影响。结果表明,掺杂的A位离子均能进行不同程度的同晶取代,其中掺杂的Pr^(3+)能较好的与La^(3+)发生同晶取代,且具有较大的比表面积和孔径分布,表面存在较强的氧物种传导性和碱性中心,在蔗渣高压液化反应中具有较高的液化油产率和较低的残渣率,生物质油的主要成分为乙酰柠檬酸三丁酯、柠檬酸三正丁酯、对乙基苯酚、6-乙基-3-肽酸酯,有利于提高油品的质量。Using cationic surfactant CTAB as organic template agent,mesoporous La0.6A0.4NiO3（A=Ce、Sr、Y、Nd、Pr） perovskite-type oxides were synthesized by co-precipitation method,and the crystalline structures,surface topography,superficial area,pore size distribution and surface properties were characterized by XRD,SEM,FTIR,BET and temperature-programmed technology,respectively. At the same time,the catalytic performances,liquefaction product distributions and liquefied oil production of mesoporous La0.6A0.4NiO3 perovskite with A-site ions replaced and were studied. The results showed that the A-site ions could dope with different degrees of crystal,and Pr^3＋could better replace La^3＋ by isomorphous substitution,and La0.6Pr0.4NiO3 perovskite had larger specific surface area and pore size distribution and stronger surface conductivity and oxygen species alkaline center,therefore it possessed high yield of liquefied oil and low rate of residue on bagasse high-pressure liquefaction reaction,and the main components of bio-oil products were acetyl citric acid three butyl ester、tributyl citrate、ethyl phenol、6-ethyl-3-peptide ester,with improved product quality.

关 键 词：共沉淀法 A位掺杂 介孔钙钛矿 蔗渣液化 

分 类 号：TQ35[化学工程] O614.813[理学—无机化学]