掺杂非晶Nb2O5的合成及其甲苯催化燃烧性能研究

o address the issues of low specific surface area and easy deactivation of active sites in traditional niobium pentoxide catalysts, this study proposes an "acid dissolution-doping" collaborative strategy to prepare Cr-doped amorphous niobium pentoxide catalysts and systematically investigates their toluene catalytic combustion performance. Innovatively, amorphous niobium pentoxide was synthesized via a selective acid dissolution-doping method, followed by calcination at 400 C for 30 h to obtain Cr-doped amorphous niobium pentoxide with abundant surface oxygen vacancy defects. Experiments reveal that Cr doping induces lattice distortion, significantly enhancing oxygen defect concentration while regulating the electron cloud distribution of Nb-O bonds to improve oxygen migration capacity. In toluene catalytic combustion, the optimized catalyst reduced the temperatures required for 10% and 90% toluene conversion (T?? and T??) to 247 C and 323 C, respectively, which are 35 C and 25 C lower than those of the undoped sample, with the reaction activation energy decreasing from 102.8 kJ/mol to 92.5 kJ/mol. Characterization confirms that Cr doping synergistically enhances the catalyst\'s low-temperature oxidation capability through electronic structure modulation and surface oxygen defect engineering. This study provides a novel approach for oxygen defect engineering and electronic structure optimization in metal oxide catalysts.