A comparative study of synthesized and commercial A-type zeolite-supported Pt catalysts for selective CO oxidation in H2H2-rich stream

The catalytic performance of Pt/A-type zeolite has been investigated for the preferential oxidation (PROX) of CO in H2H2-rich stream in the temperature range of 100–300∘C and λ=2λ=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%)(∼80%) and CO conversion of ∼95%∼95% were obtained at a temperature of ∼160∘C. The effects of H2OH2O and CO2CO2, present in the simulated reformate stream, on the catalytic performance were also studied. It was found that CO2CO2 had no significant effect on the conversion, while H2OH2O depressed the selectivity and conversion of both Pt/A-type zeolite catalysts.