A highly efficient Pd\|BMImCl/TiO\-\%y\%\|SiO\-\%x\% catalyst system synthesized through sol\|gel method from palladium complex, ionic liquid, titanate and silicate esters was found for the oxidative carbonylation of ...A highly efficient Pd\|BMImCl/TiO\-\%y\%\|SiO\-\%x\% catalyst system synthesized through sol\|gel method from palladium complex, ionic liquid, titanate and silicate esters was found for the oxidative carbonylation of amines. The catalyst efficiency was much higher than that reported in previous papers and the TOF number reached to 10 372 when catalyst 0.05%Pd\|4.6%BMImCl/TiO\-\%y\%\|SiO\-\%x\% was used. The usability of ionic liquid was the key point for preparation of this catalyst system because of its high dissolvability to palladium complex and affording appropriate micro\|environment for the reaction. The synergism among palladium complex, ionic liquid, titanate and silicate was the main reason for the high catalytic activity of the catalyst system. BET, AES and XRD were used to characterized the catalysts in detail.展开更多
以金属硝酸盐为原料、柠檬酸为络合剂,采用溶胶-凝胶法和高温焙烧法制备了系列CuxCo1-xCo Al O4复合氧化物催化剂,并采用浸渍法制备了相应的K改性催化剂,将这些催化剂用于N2O分解反应,考察了催化剂组成和K负载量对活性的影响。采用N2物...以金属硝酸盐为原料、柠檬酸为络合剂,采用溶胶-凝胶法和高温焙烧法制备了系列CuxCo1-xCo Al O4复合氧化物催化剂,并采用浸渍法制备了相应的K改性催化剂,将这些催化剂用于N2O分解反应,考察了催化剂组成和K负载量对活性的影响。采用N2物理吸附(BET)、XRD和H2-TPR等技术对催化剂的结构进行了表征。实验结果表明,Cu0.1Co0.9Co Al O4催化剂的活性较高。表征结果显示,系列CuxCo1-xCo Al O4复合氧化物均为尖晶石型结构。在550℃下N2O连续进行分解反应600 min,有氧无水气氛中Cu0.1Co0.9Co Al O4和0.03K/Cu0.1Co0.9Co Al O4(K与(Cu+Co)的原子比为0.03)催化剂上的N2O转化率分别为77.0%和92.8%;而在有氧有水气氛中Cu0.1Co0.9Co Al O4和0.03K/Cu0.1Co0.9Co Al O4催化剂上的N2O转化率分别为14.5%和36.2%。与Cu0.1Co0.9Co Al O4催化剂相比,0.03K/Cu0.1Co0.9Co Al O4催化剂具有较高的活性和稳定性。展开更多
The La-Ni complex oxide catalyst was prepared by solid state reactions under microwave.The structure and reducibility of the catalyst were characterized by using TG-DTA,XRD,TEM and TPR methods.At the same time the cat...The La-Ni complex oxide catalyst was prepared by solid state reactions under microwave.The structure and reducibility of the catalyst were characterized by using TG-DTA,XRD,TEM and TPR methods.At the same time the catalytic activity of oxidative dehydrogenation of ethylbenzene to styrene with carbon dioxide over the complex oxide nanoparticle was investigated.The results show that the product is K2NiF4 nanoparticles,and the size is 13 nm.The complex oxide sample had high activity for the oxidative dehydrogenation of ethylbenzene to styrene.展开更多
用 XAFS(X-ray absorption fine structure)分析了由溶胶-凝胶、液相浸渍和化学气相沉积等三种方法制备的二氧化钛和二氧化硅复合氧化物的 Ti K 边结构．结果表明：溶胶-凝胶法制得的复合氯化物中的钛分散很好，液相浸渍法次之，而化学...用 XAFS(X-ray absorption fine structure)分析了由溶胶-凝胶、液相浸渍和化学气相沉积等三种方法制备的二氧化钛和二氧化硅复合氧化物的 Ti K 边结构．结果表明：溶胶-凝胶法制得的复合氯化物中的钛分散很好，液相浸渍法次之，而化学气相沉积法最差，不论哪种方法，随钛含量(或钛硅原子比)的增加，边前特征峰 A2降低，钛的第一配位层 Ti-O 的配位数和键长增加；在复合载体中既有钛中心对称的八面体6配位 TiO_6的结构也有钛中心对称性差的四面体4配位 TiO_4或五面体5配位结构，并且随钛含量增加，钛的局域结构越来越接近锐钛矿型二氧化钛，根据 XAFS、XRD、IR 表征结果，提出了钛硅复合氧化物模型。展开更多
文摘A highly efficient Pd\|BMImCl/TiO\-\%y\%\|SiO\-\%x\% catalyst system synthesized through sol\|gel method from palladium complex, ionic liquid, titanate and silicate esters was found for the oxidative carbonylation of amines. The catalyst efficiency was much higher than that reported in previous papers and the TOF number reached to 10 372 when catalyst 0.05%Pd\|4.6%BMImCl/TiO\-\%y\%\|SiO\-\%x\% was used. The usability of ionic liquid was the key point for preparation of this catalyst system because of its high dissolvability to palladium complex and affording appropriate micro\|environment for the reaction. The synergism among palladium complex, ionic liquid, titanate and silicate was the main reason for the high catalytic activity of the catalyst system. BET, AES and XRD were used to characterized the catalysts in detail.
文摘以金属硝酸盐为原料、柠檬酸为络合剂,采用溶胶-凝胶法和高温焙烧法制备了系列CuxCo1-xCo Al O4复合氧化物催化剂,并采用浸渍法制备了相应的K改性催化剂,将这些催化剂用于N2O分解反应,考察了催化剂组成和K负载量对活性的影响。采用N2物理吸附(BET)、XRD和H2-TPR等技术对催化剂的结构进行了表征。实验结果表明,Cu0.1Co0.9Co Al O4催化剂的活性较高。表征结果显示,系列CuxCo1-xCo Al O4复合氧化物均为尖晶石型结构。在550℃下N2O连续进行分解反应600 min,有氧无水气氛中Cu0.1Co0.9Co Al O4和0.03K/Cu0.1Co0.9Co Al O4(K与(Cu+Co)的原子比为0.03)催化剂上的N2O转化率分别为77.0%和92.8%;而在有氧有水气氛中Cu0.1Co0.9Co Al O4和0.03K/Cu0.1Co0.9Co Al O4催化剂上的N2O转化率分别为14.5%和36.2%。与Cu0.1Co0.9Co Al O4催化剂相比,0.03K/Cu0.1Co0.9Co Al O4催化剂具有较高的活性和稳定性。
文摘The La-Ni complex oxide catalyst was prepared by solid state reactions under microwave.The structure and reducibility of the catalyst were characterized by using TG-DTA,XRD,TEM and TPR methods.At the same time the catalytic activity of oxidative dehydrogenation of ethylbenzene to styrene with carbon dioxide over the complex oxide nanoparticle was investigated.The results show that the product is K2NiF4 nanoparticles,and the size is 13 nm.The complex oxide sample had high activity for the oxidative dehydrogenation of ethylbenzene to styrene.
文摘用 XAFS(X-ray absorption fine structure)分析了由溶胶-凝胶、液相浸渍和化学气相沉积等三种方法制备的二氧化钛和二氧化硅复合氧化物的 Ti K 边结构．结果表明：溶胶-凝胶法制得的复合氯化物中的钛分散很好，液相浸渍法次之，而化学气相沉积法最差，不论哪种方法，随钛含量(或钛硅原子比)的增加，边前特征峰 A2降低，钛的第一配位层 Ti-O 的配位数和键长增加；在复合载体中既有钛中心对称的八面体6配位 TiO_6的结构也有钛中心对称性差的四面体4配位 TiO_4或五面体5配位结构，并且随钛含量增加，钛的局域结构越来越接近锐钛矿型二氧化钛，根据 XAFS、XRD、IR 表征结果，提出了钛硅复合氧化物模型。
