Ordered mesoporous carbon as a support for palladium-based hydrodechlorination catalysts
Abstract
Ordered mesoporous carbon (OMC) was employed as a support for palladium nanoparticles in catalysts for the gas phase hydrodechlorination (HDC) of trichloromethane (TCM). 1 wt% palladium was incorporated using three methods: incipient wetness (IW); a dilute solution (DS) method; and a solid-liquid (SL) method. The effect of the preparation method on catalyst structure and activity was investigated. Catalyst composition and nanostructure were studied using gas physisorption, high specification transmission electron microscopy and X-ray photoelectron spectroscopy. Catalytic conversion and product selectivities were determined in steady-state activity tests at temperatures between 70 and 300 °C. Two of the catalysts (IW and DS) showed excellent dispersion of fine Pd nanoparticles of average diameter ~2 nm. These materials showed excellent activity for HDC of TCM which compares favourably with the performance reported for Pd on amorphous carbon catalysts. In addition, they showed relatively high selectivities to the more valuable higher hydrocarbons. However, the SL method gave rise to catalysts with larger particles (~3 nm) and a less uniform palladium distribution. This resulted in lower conversion and lower selectivities to higher hydrocarbons and in more severe catalyst deactivation at the highest reaction temperatures.
Citation
Sakina , F , Fernandez-Ruiz , C , Bedia , J , Gomez-Sainero , L & Baker , R 2020 , ' Ordered mesoporous carbon as a support for palladium-based hydrodechlorination catalysts ' , Catalysts , vol. 11 , no. 1 , 23 . https://doi.org/10.3390/catal11010023
Publication
Catalysts
Status
Peer reviewed
ISSN
2073-4344Type
Journal article
Description
Funding: University of St Andrews for a PhD scholarship (FS); FEDER/Ministerio de Ciencia, Innovación y Universidades – Agencia Estatal de Investigación / CTM2017-85498-R. C. Fernández Ruiz acknowledges MINECO for his research grant.Collections
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