In situ hydrothermally synthesized mesoporous LaCoO3/SBA-15 catalysts: High activity for the complete oxidation of toluene and ethyl acetate

Mesoporous yLaCoO3/SBA-15 (y = 10–50 wt%) catalysts were prepared and characterized for the combustion of toluene and ethyl acetate (EA). The results show that well-ordered mesoporous LaCoO3/SBA-15 catalysts of high surface areas (338–567 m2/g) could be fabricated by a facile in situ method of hydrothermal treatment. The particles of perovskite-type LaCoO3 were highly dispersed on the walls of pore channels. The ordered mesoporous structure and high dispersion of LaCoO3 are beneficial to the adsorption and activation of toluene and EA molecules. We found that in terms of specific activity, the in situ fabricated 35LaCoO3/SBA-15 and 40LaCoO3/SBA-15 is, respectively, superior to 35LaCoO3/SBA-15_imp (generated by incipient wetness impregnation method) and bulk LaCoO3 (prepared by sol–gel method) in catalytic performance. Based on the above results, we conclude that the excellent performance can be attributed to the good dispersion of highly reducible LaCoO3 species in yLaCoO3/SBA-15.

A novel in situ strategy has been developed to disperse LaCoO3 on mesoporous silica. It is found that the 35LaCoO3/SBA-15 catalyst fabricated hydrothermally by the in situ method is superior to 35LaCoO3/SBA-15_imp (prepared by impregnation method) and bulk LaCoO3 (generated by sol–gel method) in specific activity.Figure optionsDownload as PowerPoint slide