Low-temperature selective catalytic reduction (SCR) of NO by NH₃ over supported NdV/Ti-x% (x = 1, 5, and 10) catalysts has been assessed in a microwave field. The NO conversion of NdV/Ti-10% catalyst reached above 85% in three cycles at temperatures ranging from 120 to 200 °C, with a N₂ selectivity of ca. 90%. The catalysts before and after activity evaluation were characterized by means of XRD, TEM, H₂-TPR, TPD, in situ DRIFTs etc. The results suggested that the catalysts exhibited excellent stability in the microwave field. It also showed that catalysts after microwave irradiation possessed an enhanced formation of oxygen species, monodentate nitrite and bridging bidentate nitrates on the catalysts' surface, which favored the generation of gaseous NO₂ to promote the “fast SCR” process. Additionally, the results implied that oxygen species activation and NO oxidation to NO₂ over the catalyst were favored in the microwave field, which facilitated NH₃-SCR reaction at low temperatures.

中文翻译：

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微波场中负载型钒酸盐催化剂的稳定性和增强的低温 NH3-SCR 活性

已在微波场中评估了负载型 NdV/Ti- x %（x = 1、5 和 10）催化剂上 NH ₃对 NO 的低温选择性催化还原（SCR） 。 NdV/Ti-10%催化剂在120~200℃温度范围内循环3次，NO转化率达到85%以上，N ₂选择性约为15%。 90%。采用XRD、TEM、H ₂ -TPR、TPD、原位DRIFT等手段对催化剂活性评价前后进行表征。结果表明催化剂在微波场中表现出优异的稳定性。研究还表明，微波辐照后的催化剂表面氧物种、单齿亚硝酸盐和桥联二齿硝酸盐的形成增强，有利于气态NO ₂的生成，促进“快速SCR”过程。此外，结果表明微波场有利于催化剂上的氧物质活化和NO氧化成NO ₂ ，​​这有利于低温下的NH _{3 -SCR反应。}