采用柠檬酸溶胶 凝胶法制备的Ce Zr La O固溶体为载体,制备CuO Ce Zr La O催化剂,用XRD,Raman,TPR等实验技术对Ce Zr La O固溶体及CuO Ce Zr La O的物相、Redox性能进行了表征。实验结果表明,Ce0.7Zr0 3-yLayO固溶体的还原性能与La含量...采用柠檬酸溶胶 凝胶法制备的Ce Zr La O固溶体为载体,制备CuO Ce Zr La O催化剂,用XRD,Raman,TPR等实验技术对Ce Zr La O固溶体及CuO Ce Zr La O的物相、Redox性能进行了表征。实验结果表明,Ce0.7Zr0 3-yLayO固溶体的还原性能与La含量有关,适量的La能促进固溶体的氧化还原。CuO的负载量为6%时,CuO Ce0.7Zr0.15La0.15O的活性最高,高分散且与载体相互作用的CuO是CO氧化活性相。展开更多
The Ce-Zr-La-O solid solution was prepared by the sol-gel method. Thestructure and the redox behavior of Ce-Zr-La-O solid solution and CuO/Ce-Zr-La-O catalysts wereinvestigated by using XRD, Raman and TPR techniques. ...The Ce-Zr-La-O solid solution was prepared by the sol-gel method. Thestructure and the redox behavior of Ce-Zr-La-O solid solution and CuO/Ce-Zr-La-O catalysts wereinvestigated by using XRD, Raman and TPR techniques. The result shows that the reduction capabilityof Ce_(0.7)Zr_(0.3-y)La_yO solid solution is related to content of La. Appropriate content of La canenhance the redox capability of the solid solution. The oxidation activity of the CuO (6 percent)/Ce_(0.7)Zr_(0.15)La_(0.15)O catalyst is the highest. CuO, which finely dispersed and interacted withthe support, is the site of oxidation activity.展开更多
采用沉淀法-水热法合成了电催化Bi_(2)O_(3)-CuO复合材料.利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等方法对样品的结构和形貌进行了研究.用电化学测试方法对材料电催化性能进行研究,用...采用沉淀法-水热法合成了电催化Bi_(2)O_(3)-CuO复合材料.利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等方法对样品的结构和形貌进行了研究.用电化学测试方法对材料电催化性能进行研究,用气相色谱和核磁共振氢谱对产物进行分析.电催化实验结果表明,Bi_(2)O_(3)-CuO复合材料的电催化性能及对甲酸盐的选择性远高于Bi_(2)O_(3)和CuO.其中比例为1∶1的Bi_(2)O_(3)-CuO复合材料性能最好,在-1.2 V vs.RHE的电位下,甲酸盐的法拉第效率为90.3%,电流密度为20 mA/cm^(2),测试10 h保持稳定.展开更多
电化学硝酸根还原制氨(Nitrate reduction to ammonia, NRA)是以硝酸根和水分别作为氮和氢的来源,采用电化学的途径实现室温下氨的绿色合成兼去除水中硝酸盐污染物,对缓解能源危机和环境问题具有重要的研究意义。然而,硝酸根到氨是一个...电化学硝酸根还原制氨(Nitrate reduction to ammonia, NRA)是以硝酸根和水分别作为氮和氢的来源,采用电化学的途径实现室温下氨的绿色合成兼去除水中硝酸盐污染物,对缓解能源危机和环境问题具有重要的研究意义。然而,硝酸根到氨是一个复杂的8e-转移过程且伴随着激烈的析氢副反应,这严重制约了合成氨的选择性和法拉第效率。为此,采用水热合成法及后续的热处理设计制备了泡沫镍负载氧化铜纳米花催化剂并探究其电化学硝酸根还原制氨性能。通过调控硝酸铜与尿素比例、热解温度等合成条件,达到泡沫镍(Ni foam, NF)均匀负载CuO纳米花的目的。结果表明,当Cu(NO3)2、CO(NH2)2的物质的量比为1∶6时,所得到的目标催化剂(CuO-6@NF)在法拉第效率、NH3产率、选择性和硝酸盐转换率方面表现出最佳性能。在-0.23 V vs.RHE情况下,CuO-6@NF NH3的产率达到1.15 mmol·h-1·cm-2,选择性为89.36%,总氮的去除率高达96.71%。此外,该催化剂还表现出良好的再现性、高稳定性以及较宽泛浓度下的适用性。展开更多
文摘采用柠檬酸溶胶 凝胶法制备的Ce Zr La O固溶体为载体,制备CuO Ce Zr La O催化剂,用XRD,Raman,TPR等实验技术对Ce Zr La O固溶体及CuO Ce Zr La O的物相、Redox性能进行了表征。实验结果表明,Ce0.7Zr0 3-yLayO固溶体的还原性能与La含量有关,适量的La能促进固溶体的氧化还原。CuO的负载量为6%时,CuO Ce0.7Zr0.15La0.15O的活性最高,高分散且与载体相互作用的CuO是CO氧化活性相。
文摘The Ce-Zr-La-O solid solution was prepared by the sol-gel method. Thestructure and the redox behavior of Ce-Zr-La-O solid solution and CuO/Ce-Zr-La-O catalysts wereinvestigated by using XRD, Raman and TPR techniques. The result shows that the reduction capabilityof Ce_(0.7)Zr_(0.3-y)La_yO solid solution is related to content of La. Appropriate content of La canenhance the redox capability of the solid solution. The oxidation activity of the CuO (6 percent)/Ce_(0.7)Zr_(0.15)La_(0.15)O catalyst is the highest. CuO, which finely dispersed and interacted withthe support, is the site of oxidation activity.
文摘采用沉淀法-水热法合成了电催化Bi_(2)O_(3)-CuO复合材料.利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等方法对样品的结构和形貌进行了研究.用电化学测试方法对材料电催化性能进行研究,用气相色谱和核磁共振氢谱对产物进行分析.电催化实验结果表明,Bi_(2)O_(3)-CuO复合材料的电催化性能及对甲酸盐的选择性远高于Bi_(2)O_(3)和CuO.其中比例为1∶1的Bi_(2)O_(3)-CuO复合材料性能最好,在-1.2 V vs.RHE的电位下,甲酸盐的法拉第效率为90.3%,电流密度为20 mA/cm^(2),测试10 h保持稳定.
基金Projects(22068021,52064030)supported by the National Natural Science Foundation of ChinaProject(202305AC160064)supported by the Yunnan Young and Middle-aged Academic and Technical Leaders Reserve Talent Program,ChinaProjects(202202AG050011,202202AG050007)supported by Yunnan Major Scientific and Technological Program,China。
