Low-Temperature Combustion Synthesis and Characterization of Co-Containing Catalysts Based on Modified Silica Gel

Abstract

Low-temperature combustion synthesis was used both for modifying silica gel support with 10 and 20 wt % Al₂O₃ and for producing supported catalysts with 10 wt % of Co active phase. Prepared catalysts were characterized by XRD, SEM, EDS, and BET method. It was revealed that these catalysts contain oxides, aluminates, and silicates of cobalt. It was shown that modification of support noticeably reduces its specific surface, while its calcination decreases the catalyst activity. The catalysts synthesized from supports with lower content of Al₂O₃ demonstrated higher specific surface and lower activity in deep oxidation of propane and CO. The catalyst on an uncalcinated support modified with 20 wt % Al₂O₃ was found to possess the highest activity in the process of deep oxidation.