Synthesis and characterization of Pd-Zr- and Pd-Rh-Beta zeolite catalysts for removal of emissions from natural gas driven vehicles

N. Kumar*, F. Klingstedt, L. E. Lindfors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The Pd-Zr- and Pd-Rh zeolite catalysts were synthesized and characterized by an x-ray powder diffractometer, a scanning electron microscope, an x-ray fluorescence instrument, a microbalance and nitrogen adsorption. The synthesized catalysts were tested for the removal of emissions from natural gas driven vehicles. The catalysts were hydrothermally aged and tested under similar reaction conditions as those of the fresh catalysts to study the mechanism of catalyst deactivation and its stabilization by zirconium and rhodium. The microbalance was used to study the redox behaviour of the catalysts. The modifications of Pd-Beta zeolite by Zr and Rh were found to stabilize the PdO species in the Beta zeolite structure. The Pd-Zr- and Pd-Rh-Beta zeolite catalysts exhibited high catalytic activity in the removal of NO, CO and unburned methane from natural gas driven vehicles.

Original languageEnglish
Pages (from-to)2981-2986
Number of pages6
JournalStudies in Surface Science and Catalysis
Volume130 C
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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