Enhancement of the catalytic performance of H-clinoptilolite in propane–SCR–NOx process through controlled dealumination

N Ghasemian, C Falamaki, M Kalbasi… - Chemical Engineering …, 2014 - Elsevier
N Ghasemian, C Falamaki, M Kalbasi, M Khosravi
Chemical Engineering Journal, 2014•Elsevier
We report for the first time the effect of clinoptilolite dealumination on the propane–SCR–NO
x process. This has been accomplished using a mild acid like oxalic acid to avoid excess
catalyst crystallinity deterioration. It had been shown that dealumination may result in a
significant enhancement of NO x conversion to N 2 when an optimum acid concentration of
0.050 M is used for a treatment period of 2 h. Dealumination substantially affects the
distribution of the concentration of acid sites of different strength. The effect of dealumination …
Abstract
We report for the first time the effect of clinoptilolite dealumination on the propane–SCR–NOx process. This has been accomplished using a mild acid like oxalic acid to avoid excess catalyst crystallinity deterioration. It had been shown that dealumination may result in a significant enhancement of NOx conversion to N2 when an optimum acid concentration of 0.050 M is used for a treatment period of 2 h. Dealumination substantially affects the distribution of the concentration of acid sites of different strength. The effect of dealumination on the HC-SCR activity of the zeolite samples is discussed in terms of Si/Al ratio, crystallinity, distribution of acid site strength, extra framework species concentration and textural characteristics of the samples.
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