Experimental study of volatile organic compounds catalytic combustion on Cu-Mn catalysts with different carriers

Catalytic combustion is an effective way for volatile organic compounds harmless treatment. In this paper, the synergism between non-noble metal active phase Cu-Mn and Y-zeolite, SiO2, gamma-Al2O3, and TiO2 was studied by catalytic combustion experiments and corresponding characterizations; the conclusions as following: Cu-Mn/SiO2 has the best activity and stability, T-10 and T-90 are 210 degrees C and 298 degrees C, respectively. Benzene can be completely oxidized below 300 degrees C, which is due to the formation of substantial Cu-Mn solid solutions and a large number of Cu2+/Mn3+ ions on the surface of SiO2. The activation energy of C6H6 in CuMn2/TiO2 is 95.50 kJ/mol, while that of the other three catalysts is close, probably 60 kJ/mol. Moreover, the stability of SiO2 is the highest and can be maintained for more than 60 hours. The fundamental reason of catalyst deactivation is the higher diffusion resistance on the surface of the catalyst with small pore size distribution and the lack of surface oxygen, which leads to the lower degree of complete oxidation of C6H6.

Automated summary

The synergism between Cu-Mn and different carriers was studied, with Cu-Mn/SiO2 showing the best activity and stability. SiO2 exhibited the highest stability and catalyst deactivation was attributed to the lack of surface oxygen and higher diffusion resistance.