2002 Fiscal Year Final Research Report Summary

Catalysts for Low-temperature Methane Oxidation

Research Project

Project/Area Number	12650779
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	触媒・化学プロセス
Research Institution	Kyushu University
Principal Investigator	SASAKI Kazunari Faculty of Engineering Sciences, Associate Professor, 大学院・総合理工学研究院, 助教授 (80322296)
Project Period (FY)	2000 – 2002
Keywords	combustion catalysis / Palladium / SnO2 / low-temperature oxidation / deactivation / methane oxidation
Research Abstract	The activity for low-temperature methane oxidation over oxide-supported catalysts such as Pd/Al_2O_3, Pd/SnO_2, and Pd/Al_2O_3-36NiO was investigated. It was found that Pd/Al_2O_3 was deactivated most significantly due to water vapor, and that Pd/Al_2O_3-36NiO was most insensitive to water vapor. The catalytic activity of Pd/Al_2O_3 decreased monotonically as water vapor concentration increased, whereas Pd/SnO_2 and Pd/Al_2O_3-36NiO showed almost constant activity under higher water vapor concentrations. The catalytic activity at high steam concentration was in the following order: Pd/SnO_2 >Pd/Al_2O_3-36NiO > Pd/Al_2O_3. Kinetic analysis with methane adsorption as the rate-limiting step was applied to evaluate the water inhibiting effect. Pd/Al_2O_3 displayed the most negative value of the enthalpy of water adsorption, while Pd/SnO_2 and Pd/Al_2O_3-36NiO exhibited similar water adsorption enthalpy.

(2 results)