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Effect of the Pt–Pd molar ratio in bimetallic catalysts supported on sulfated zirconia on the gas-phase hydrodechlorination of chloromethanes

AuthorsBedia, J.; Arevalo-Bastante, A.; Grau, J. M.; Dosso, L. A.; Rodriguez, Juan J.; Mayoral, Álvaro; Díaz Carretero, Isabel ; Gómez-Sainero, L.M.
Sulfated zirconia
Issue Date2017
CitationJournal of Catalysis 352: 562- 571 (2017)
AbstractBimetallic Pt:Pd catalysts with different molar ratios and 0.5 wt.% overall metal load supported on sulfated zirconia catalysts were synthesized and tested in the gas-phase hydrodechlorination (HDC) of chloromethanes and their mixtures. The catalysts were characterized by adsorption–desorption of N at −196 °C, X-ray diffraction, X-ray photoelectronic spectroscopy, temperature-programmed reduction, and aberration-corrected scanning transmission electron microscopy (STEM). The effect of the Pt:Pd molar ratio on the activity, stability, and selectivity was analyzed. The high acidity of the sulfated zirconia results in metal particles of small size (mainly <5 nm), as confirmed by STEM. The bimetallic catalysts showed higher stability than the monometallic ones, as demonstrated in long-term experiments (80 h on stream), confirming the positive effect of combining the two metallic phases. Turnover frequency (TOF) values in the range 0.0007–0.0168 s and apparent activation energies between ≈41 and 44 kJ·mol were obtained. TOF values for dichloromethane HDC increased with increasing mean metal particle size within the range of this work (≈1.2–2.3 nm). The catalysts with Pt:Pd molar ratios of 1:3 and 1:1 showed significantly better performance than the 3:1 one for overall dechlorination due to their higher atomic metal content and TOF at the same total metal weight load (0.5%).
Publisher version (URL)http://dx.doi.org/10.1016/j.jcat.2017.06.013
Identifiersdoi: 10.1016/j.jcat.2017.06.013
issn: 1090-2694
e-issn: 1090-2694
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