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Carbon support hydrogenation in Pd/C catalysts during reductive thermal treatment |
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| Authors: | Kristina N Iost Vadim A Borisov Victor L Temerev Yury V Surovikin Polina E Pavluchenko Mikhail V Trenikhin Aleksey B Arbuzov Dmitry A Shlyapin Pavel G Tsyrulnikov Aleksey A Vedyagin |
| Affiliation: | 1. Institute of Hydrocarbon Processing SB RAS, Neftezavodskaya St., 54, Omsk, 644040, Russian Federation;2. Boreskov Institute of Catalysis SB RAS, Pr. Ac. Lavrentieva, 5, Novosibirsk, 630090, Russian Federation;3. National Research Tomsk Polytechnic University, Lenin Av., 30, Tomsk, 634050, Russian Federation |
| Abstract: | The resistance of the Pd/C samples towards hydrogenation of the carbon support was studied in the temperature-programmed and isothermal regimes. Carbonaceous graphite-like material Sibunit was used as a carbon support. Pristine Sibunit was additionally graphitized via high temperature treatment (1900 °C) in an inert atmosphere. Both initial and graphitized supports were subjected to oxidative treatment in order to increase the amount of surface functional oxygen-containing groups. Palladium (1 wt%) was supported using an aqueous solution of H2PdCl4. All the samples were characterized by a low-temperature adsorption of nitrogen, transmission electron microscopy, and Raman spectroscopy. The graphitization procedure was found to decrease significantly the specific surface area of the support, while the oxidative treatment affects this parameter negligibly. Testing the Pd-containing samples in a hydrogen flow revealed the following order in accordance with amount of methane released: Pd/iSib » Pd/iSib-ox > Pd/gSib > Pd/gSib-ox. |
| Keywords: | Palladium catalysts Carbonaceous support sibunit Thermal stability Reductive conditions Methanation |
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