A comparative study of synthesized and commercial A-type zeolite-supported Pt catalysts for selective CO oxidation in -rich stream

The catalytic performance of Pt/A-type zeolite has been investigated for the preferential oxidation (PROX) of CO in H 2 -rich stream in the temperature range of 100– 300 ∘ C and λ = 2 . The NaA zeolite was synthesized by sol–gel process and microwave heating technique and compared with the commercial one. The results indicated that both synthesized and commercial NaA zeolite-supported Pt catalysts gave similar CO conversion profiles. CO was completely removed at temperatures of ∼ 200 – 220 ∘ C , whereas the maximum selectivity ( ∼ 80 % ) and CO conversion of ∼ 95 % were obtained at a temperature of ∼ 160 ∘ C . The effects of H 2 O and CO 2 , present in the simulated reformate stream, on the catalytic performance were also studied. It was found that CO 2 had no significant effect on the conversion, while H 2 O depressed the selectivity and conversion of both Pt/A-type zeolite catalysts.