Effect of the Pt–Pd molar ratio in bimetallic catalysts supported on sulfated zirconia on the gas-phase hydrodechlorination of chloromethanes
Entidad
UAM. Departamento de Ingeniería QuímicaEditor
ElsevierFecha de edición
2017-07-13Cita
10.1016/j.jcat.2017.06.013
Journal of Catalysis 352 (2017): 562 - 571
ISSN
0021-9517 (print); 1090-2694 (online)DOI
10.1016/j.jcat.2017.06.013Financiado por
The authors are grateful to the Spanish ‘‘Ministerio de Economíay Competitividad (MINECO)” for financial support (ProjectsCTM2011-28352 and CTM2014-53008-RProyecto
Gobierno de España. CTM2011-2835; Gobierno de España. CTM2014-53008-RVersión del editor
https://doi.org/10.1016/j.jcat.2017.06.013Materias
Chloromethanes; Hydrodechlorination; Palladium; Platinum; Sulfated zirconia; QuímicaDerechos
© 2017 Elsevier Inc.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Resumen
Bimetallic 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 N2 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−1 and apparent activation energies between ≈41 and 44 kJ·mol−1 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%)
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Google Scholar:Bedia García-Matamoros, Jorge
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Arevalo-Bastante, A.
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Grau, J. M.
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Dosso, L. A.
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Rodríguez Jiménez, Juan José
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Mayoral, A.
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Diaz, I.
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Gómez Sainero, Luisa María
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