Abstract
X zeolite-carbon composites as Pt supports with different mass ratios of 3:1 (S1), 1:1 (S2), and 1:3 (S3) were synthesized by sol-gel method. The catalytic performance of Pt/composites for MOR and ORR was investigated and compared to Pt/X zeolite and Pt/C. Pt nanoparticles were prepared by ultrasound method via chemical reduction of Pt precursor with alcohol. The materials synthesized were characterized by XRD, nitrogen physisorption, TEM, SEM-EDS, and XPS. The structural, acidic, and textural properties of different supports demonstrated an effect on the Pt particle size, metal dispersion, Pt load, and Pt-support interaction. Pt/composites showed higher specific activity for MOR compared to Pt/C. Pt/S3 exhibited lower onset potentials, better stability, and an increment in the specific activity for MOR, which is 2.7, 2.0, and 2.9 higher than Pt/S1, Pt/S2, and Pt/C, respectively. For ORR, Pt/composite and Pt/C catalysts synthesized presented more tolerance to methanol than commercial Pt/C.
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