期刊
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
卷 -, 期 -, 页码 -出版社
WILEY
DOI: 10.1002/cjce.24967
关键词
Ag/?-Al2O3 catalyst; Nitrogen oxides (NOx); pH-controlled synthesis; Selective catalytic reduction (SCR); Single-step sol-gel method
This article investigates Ag/?-Al2O3 catalyst for the selective reduction of NOx and finds that it is effective when using propylene as a reducing agent. Different synthesis methods were analyzed, and the one-pot sol-gel synthesis method showed superior performance. The influence of synthesis conditions on the catalyst properties and activity were examined through experiments and simulations. The optimized catalyst exhibited excellent performance with a wide temperature window.
Ag/?-Al2O3 is an effective catalyst for the selective reduction of NOx (SCR) using propylene as a reducing agent. The catalyst performance is greatly influenced by the synthesis procedure. Various methods for synthesis of Ag/?-Al2O3 are analyzed, and their performance is examined via packed bed reactor experiments in this work. An optimal one-pot synthesis method, single-step sol-gel (SSG) synthesis, is explored systematically. The SSG-synthesized catalyst shows better performance than those prepared via wet impregnation. The influence of synthesis conditions, specifically pH, on the textural and morphological properties of the SSG-synthesized Ag/?-Al2O3, and therefore the activity for hydrocarbon-based SCR in a packed-bed reactor, are analyzed using experiments and simulations. The optimized catalyst demonstrates excellent performance (90% NOx conversion) for NOx reduction under nominal operating conditions with a wide activity temperature window (300-600 degrees C). The catalyst shows good time-on-stream performance and is effective at higher inlet oxygen concentrations and space velocities. A global kinetic model, which uses synthesis-pH-dependent parameters, is proposed, and its ability to predict the activities of these catalysts is validated.
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