Effect of Preparation Method on Catalytic Performance of Ag/OMS-2 for the Oxidation of Ethyl Acetate and Formaldehyde

The octahedral molecular sieve (OMS-2)-supported Ag samples were prepared by the pre-incorporation, ion exchange, and polyvinyl alcohol (PVA)-protecting methods, respectively. The XRD, TEM, BET, H 2 -TPR, O 2 -TPD, and FT-IR techniques were used to investigate effects of the preparation method on physicochemical property of the samples, over which oxidation of ethyl acetate and formaldehyde was used as probe reactions. It is found that catalytic activity was dependent on physicochemical property of the sample, and decreased in the order of Ag/OMS-2-PI > Ag/OMS-2-IE > Ag/OMS-2-PVA > OMS-2. The Ag/OMS-2-PI sample performed the best: the T 90 for ethyl acetate and formaldehyde oxidation was 200 and 170 °C, respectively. The Ag species in Ag/OMS-2-PI were uniformly distributed in the pores and channels of the OMS-2 support. The characterization results indicate that the outstanding catalytic activity of Ag/OMS-2-PI was due to its high surface Mn 3+ and adsorbed oxygen species concentrations, good low-temperature reducibility, and the largest surface area.