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Abstract
Effects of propane/methane ratios on NOx reduction by mixtures of methane and propane over In/H-BEA catalyst were investigated at temperatures ranging from 250 to 550°C. The higher catalytic activity of In/H-BEA was exhibited for CH4-SCR at high temperatures above 450°C, while the higher NOx conversion was achieved in C3H8-SCR at below 425°C. A broadened temperature window and enhanced CO2 selectivity were achieved by combining of methane and propane as the co-reductant. The mixtures with propane/methane of 1/2 showed the most superior T50 (325°C) and T90 (500°C) temperatures for NOx reduction over In/H-BEA catalyst. For the promotion mechanism of propane on NO reduction by methane at low temperature, the formation of carbonaceous species (e.g. R-COOH) were enhanced by the activation of C3H8 on Brønsted acid sites at low temperature, and further promoted the generation of NCO species, which was a crucial determining step for NO reduction.
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