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Fundamental investigation on layered double hydroxides derived mixed metal oxides for selective catalytic reduction of NOx by H-2

机译：分层双氢氧化物衍生混合金属氧化物的基础研究，H-2的选择性催化还原NOx

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摘要

Selective catalytic reduction of nitrogen oxides (NOx) to N-2 by H-2 (H-2-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 H-2-SCR catalysts was investigated for the first time. New H-2-SCR catalysts Pt/M3Al1Ox (M = Co, Mg, Ni, or Cu) were carefully characterized and systematically evaluated in the presence of O-2 at 120-300 degrees C. All 0.1 Pt/M3Al1Ox catalysts exhibited high SCR activity, with a NOx conversion higher than 90% at 200-220 degrees C. Among them, 0.1 Pt/Mg3Al1Ox showed higher NOx conversion rate than other catalysts, while 0.1 Pt/Ni3Al1Ox showed higher N-2 selectivity. The influences of GHSV, H-2 and O-2 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 H-2-SCR.
机译：通过H-2（H-2-SCR）将氮氧化物（NOx）选择性催化还原为N-2不会产生任何二次污染物，并且可以在相对较低的温度下降低NOx。为了实现这一目标，适当的催化剂至关重要。本文首次研究了由二元层状双氢氧化物（LDHs）衍生的混合金属氧化物作为铂基H-2-SCR催化剂载体的性能。新的H-2-SCR催化剂Pt/M3Al1Ox（M=Co、Mg、Ni或Cu）在120-300℃下存在O-2时进行了仔细表征和系统评估。所有0.1 Pt/M3Al1Ox催化剂均表现出较高的SCR活性，在200-220℃时NOx转化率高于90%。其中，0.1 Pt/Mg3Al1Ox的NOx转化率高于其他催化剂，而0.1 Pt/Ni3Al1Ox表现出更高的N-2选择性。还研究了GHSV、H-2和O-2进料浓度、CO2和水蒸气对0.1 Pt/Ni3Al1Ox催化剂上NOx转化率的影响。我们相信，这项工作可以为H-2-SCR支撑材料的选择提供新的选择。

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