Activation of NO with microwave irradiation for low temperature direct decomposition

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2024-09-16 DOI:10.1016/j.apcata.2024.119965

Yuta Ikoma , Fang Siman , Motonori Watanabe , Miki Inada , Atsushi Takagaki , Tatsumi Ishihara

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Abstract

Direct decomposition of nitric oxide (NO) on metal oxides under microwave (MW) irradiation was investigated and it was found that the most metal oxides show higher NO decomposition activity than that in the conventional electric furnace heating at low temperature. Among the examined oxides, it was found that TiO₂, CeO₂, ZrO₂, and Y₂O₃ show about 95 % or higher NO conversion at 573 K, and both N₂ and O₂ are formed with almost equimolar amount. In particular, ZrO₂ exhibited high and stable NO decomposition activity more than 25 h. In this study, the influence of coexisting gases on NO decomposition activity on ZrO₂ under microwave heating was further investigated and the direct decomposition of NO can be proceeded even in the presence of 5 % O₂, 5 % CO_2, or humidified condition. Mechanism of high NO decomposition activity under MW irradiation was also studied and it was found that removal of oxygen from the catalyst was much increased under MW irradiation because of direct activation of oxygen and also direct activation of NO which is also suggested by pulse reaction.

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用微波辐照活化 NO，实现低温直接分解

研究发现，大多数金属氧化物在微波（MW）辐照下的一氧化氮（NO）直接分解活性高于传统电炉低温加热时的一氧化氮分解活性。在所研究的氧化物中，发现 TiO2、CeO2、ZrO2 和 Y2O3 在 573 K 时的 NO 转化率约为 95% 或更高，并且几乎以等摩尔量生成 N2 和 O2。其中，ZrO2 表现出高而稳定的 NO 分解活性，分解时间超过 25 小时。本研究进一步研究了在微波加热条件下，共存气体对 ZrO2 上 NO 分解活性的影响，结果表明，即使存在 5 % O2、5 % CO2 或加湿条件，也能直接分解 NO。此外，还研究了微波辐照下氮氧化物高分解活性的机理，发现在微波辐照下，由于氧气的直接活化和氮氧化物的直接活化，催化剂中氧气的去除率大大提高，这也是脉冲反应所暗示的。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.