不同制备方法对铬掺杂NiFe_2O_4分解CO_2的活性影响  

Effect of different preparation methods of the Cr^(3+) doped nickel ferrite on catalytic performance of CO_2 decomposition to C

作　　者：傅毛生[1] 陈林深[2] 刘元隆[1] 陈诵英[3] 

机构地区：[1]南昌航空大学环境与化学工程学院,江西南昌330034 [2]浙江大学分析测试中心西溪校区,浙江杭州310028 [3]浙江大学催化研究所,浙江杭州310028

出　　处：《化学研究与应用》2007年第9期970-974,共5页Chemical Research and Application

基　　金：国家自然科学基金资助项目(NO.20277033);南昌航空大学科研基金项目资助

摘　　要：采用共沉淀法和柠檬酸络合法分别制备掺杂4%Cr3+的N iFe2O4,运用XRD、DTA-TG、BET等手段对其结构进行表征,并探讨其直接催化分解CO2成C反应活性影响。研究结果表明,采用共沉淀法和柠檬酸络合法均能制备具有单一尖晶石结构的纳米晶的铬掺杂N iFe2O4。共沉淀法制备的铬掺杂N iFe2O4晶粒很小,平均晶粒只有8.3nm,比表面积为160.2 m2g-1,H2还原后其分解CO2成C的转化率为96%;而柠檬酸络合法制备的铬掺杂N iFe2O4晶粒比前者大,平均晶粒37.5nm左右,比表面积为51.6 m2g-1,其CO2分解成C的转化率只有82%。The Cr^3＋ doped nickel ferrite was prepared by co-precipitation and citrate coordination method.The structural properties were investigated by XRD、DTA-TG and BET.The catalytic performance of CO2 decomposition to C with its hydrogen-reduced Cr^3＋ doped nickel ferrite was evaluated.The results show that NiFe2O4 doped Cr^3＋ prepared by the two methods has a single spinel structure and nano-size crystal.The sample prepared by co-precipitation has a very small crystallite size of 8.3nm in the 311 direction and a very big specific surface area of 160.2 m^2g^-1,yielding a conversion rate of 96% of CO2 decomposition to C;However,the sample prepared by citrate coordination method has a crystallite size of 37.5nm in the 311 direction and a specific surface area of 51.6m^2g^-1,only yielding a conversion rate of 82%.

关 键 词：共沉淀法 柠檬酸络合法 铬掺杂NiFe2O4 CO2分解 XRD 

分 类 号：O643.36[理学—物理化学]