Abstract
Abstract Selective catalytic reduction of nitrogen oxides (NOx) to N2 by H2 (H2-SCR) does not create any secondary contaminants and can reduce NOx at relatively low temperature. To achieve this goal, an appropriate catalyst is essential. In this contribution, the performance of binary layered double hydroxides (LDHs) derived mixed metal oxides as support for Pt-based H2-SCR catalysts was investigated for the first time. New H2-SCR catalysts Pt/M3Al1Ox (M = Co, Mg, Ni, or Cu) were carefully characterized and systematically evaluated in the presence of O2 at 120–300 °C. All 0.1 Pt/M3Al1Ox catalysts exhibited high SCR activity, with a NOx conversion higher than 90% at 200–220 °C. Among them, 0.1 Pt/Mg3Al1Ox showed higher NOx conversion rate than other catalysts, while 0.1 Pt/Ni3Al1Ox showed higher N2 selectivity. The influences of GHSV, H2 and O2 feed concentration, CO2, and water vapor on the NOx conversion over 0.1 Pt/Ni3Al1Ox catalyst were also investigated. We believe that this work could provide a new option for the selection of supporting materials for H2-SCR.
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