Effect of nanostructure on catalytic degradation of chlorobenzene over Ce-V catalysts

Abstract

Ce-V catalysts were synthesized by a hydrothermal method. In order to change the chemical environment of solution during the preparation process, NaOH solution and ammonia were used to adjust the pH value, and surfactant P123 was added to limit the grain growth direction of Ce-V catalysts. And then different Ce-V catalysts with nano-cubic(CV-1), nano-particles (CV-2) and nano- robs (CV-3) were obtained, respectively.The chlorobenzene conversion of Ce-V catalysts with different nano-structure were investigated. The Ce-V catalysts were characterized by XRD, BET and TEM, and the controlling mechanism of nano-structure on the catalytic activity was analysed.The results show that the particles size order of Ce-V catalysts is CV-1 > CV-2 > CV-3, and the catalytic activity order of Ce-V catalysts is CV-3 > CV-2 > CV-1.New phase CeVO4 forms in CV-2 and CV-3 catalysts, which weakens the agglomeration of VOx on the catalyst surface and promotes catalytic activity. The kinetics calculation results of Ce-V catalysts show that the apparent activation energy of CV-3 is the highest, which is 9.26±3.76 kJ·mol-1. It is consistent with the catalytic activity test.

Keywords

• nano-structure
• catalytic degradation
• ce-v catalyst
• chlorobenzene
• hydrothermal method