RT Journal Article
T1 Hydrodechlorination of dichloromethane with mono- and bimetallic Pd–Pt on sulfated and tungstated zirconia catalysts
A1 Bedia, Jorge
A1 Gómez-Sainero, Luisa María
A1 Grau, Javier Mario
A1 Busto, Mariana
A1 Martín Martínez, María
A1 Rodriguez, Juan
AB Monometallic (Pt or Pd) and bimetallic (Pt–Pd) catalysts supported on zirconia promoted with sulfate (SZ) or tungsten oxide (WZ) were prepared and tested in the gas-phase hydrodechlorination of dichloromethane. The catalysts showed a high selectivity to non-chlorinated products (between 80% and 90% at 250 °C) being methane the main reaction product. As a general trend, the WZ catalysts yielded significantly higher dichloromethane conversion than the SZ ones, yielding all the catalysts initial conversions higher than 80% at a reaction temperature of 250 °C. However, the former showed a very poor stability regardless of the metallic active phase. On the other hand, the presence of palladium in the sulfated zirconia catalyst avoids deactivation as proved in long-term experiments (80-h time on stream). XPS and elemental analyses of the used catalysts suggest that adsorption of organochlorinated species is a cause of deactivation by blocking the active sites. In the monometallic SZ Pt catalyst, deactivation occurs also by poisoning of the Pt sites by the H2S resulting from sulfate reduction under the hydrogen-rich gas atmosphere. The metal particle size appears to be a critical point with regard to stability of the catalysts. The one with the highest dispersion showed the highest stability with no signs of deactivation after more than 80 h on stream.
PB Elsevier
SN 0021-9517
YR 2012
FD 2012
LK https://hdl.handle.net/20.500.14352/97143
UL https://hdl.handle.net/20.500.14352/97143
LA eng
NO Bedia, Gómez-Sainero, Grau, Busto, Martin-Martinez, & Rodriguez. (2012). Hydrodechlorination of dichloromethane with mono- and bimetallic Pd-Pt on sulfated and tungstated zirconia catalysts. Journal of Catalysis, 294, 207-215. https://doi.org/10.1016/J.JCAT.2012.07.023
NO Ministerio de Ciencia e Innovación (España)
NO European Commission
DS Docta Complutense
RD 4 abr 2025