Development of a process for low temperature catalytic combustion of natural gas has enormous applications in fuel efficiency, energy production and air pollution control. The project describes activities and properties of three catalysts [5% Pd/y-alumina (5-Pd/Al2O3); 5% Pd/ceria (5-Pd/CeO2); 5% Pd/20% ceria-y-alumina (5-Pd 20-CeOx/Al2O3)] prepared by a syringe injection-vortex mixing method. The catalytic activity as percent methane conversion was determined in a fixed bed flow reactor using a gas mix of 1% methane, 4% oxygen and balance nitrogen and a gas hourly space velocity of 45, 000 cc/g.catalyst.hr-1. The catalytic activity was 100% at 3000C with the 5-Pd/Al2O3 catalyst; however, the conversion were 28% and 73% at this temperature with 5-Pd/CeO2 and 5-Pd 20-CeOx/Al2O3 respectively. The catalyst were characterized by Brunauer-Emmett-Teller (BET), pulse chemisorption, temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The properties of 5-Pd/Al2O3 and 5-Pd 20-CeOx/Al2O3 catalysts were almost similar (Table 1). TPR showed a sharp reduction peak at 220 °C characteristic of redox properties of ceria. XPS showed presence of PdO/PdOx and Ce(III)- and Ce(IV)-oxides. The activation energies for the catalytic reactions were determined in the kinetic regions with 20-30% conversions. The activation energies were 53.6 kJ/mol, 62.6 kJ/mol and 73.1 kJ/mol for 5-Pd/Al2O3, 5-Pd/CeO2 and 5-Pd 20-CeOx/Al2O3 respectively. The conversion and activation energy values are in disagreement with those reported in the literature, and we did not see the synergic effect of ceria.

Activity and characteristics of Pd/alumina and Pd/ceria-alumina catalysts for methane combustion

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.