This paper characterizes the integrated activity of fresh and used catalysts on the selective catalytic reduction of NOx using CH4. The synthesised K–Ag/Al2O3 catalysts exhibited a promotional effect on deNOx activity in the presence of SO2. In addition, 130 h of time-on-stream reactions demonstrated the thermal and mechanical stability of the synthesised materials. A TEM analysis and diffraction patterns demonstrated the sintering of finely dispersed particles to ~0.5 micron size clusters by sulphation. Furthermore, under reaction conditions, the de-sulphation initiated the re-dispersion of the Ag clusters to different sized particles. The TPD studied demonstrated the strong adsorption sites for methane and formation of R–SOx compounds. This surface modification in the SO2 feed stream is considered to be the reason for the promotional effect on the deNOx reaction.
Research on Chemical Intermediates – Springer Journals
Published: Jul 13, 2012
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