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Insights into High-Performance Monolith Catalysts of Co3O4 Nanowires Grown on Nickel Foam with Abundant Oxygen Vacancies for Formaldehyde Oxidation
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-09-23 , DOI: 10.1021/acscatal.0c02944 Kaiwen Zha 1 , Wenjie Sun 1 , Zhen Huang 1 , Hualong Xu 1 , Wei Shen 1
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-09-23 , DOI: 10.1021/acscatal.0c02944 Kaiwen Zha 1 , Wenjie Sun 1 , Zhen Huang 1 , Hualong Xu 1 , Wei Shen 1
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Monolith catalysts of cobalt oxides grown on metal substrates exhibited good catalytic performance in the oxidation of volatile organic compounds (VOCs) and oxygen vacancies play a key role in activating. However, there is rarely a report about the increase in oxygen vacancies using a facile method in monolith catalysts. Besides, the corresponding mechanism of the promotional effects of oxygen vacancies over the monolith catalysts still remains elusive. In this work, Co3O4 nanowires with abundant oxygen vacancies in situ grown on the Ni foam (r-Co3O4 NW@Ni foam) were synthesized and used as high-performance monolith catalysts for catalytic oxidation of formaldehyde. The r-Co3O4 NW@Ni foam catalysts showed outstanding catalytic activity and stability. The T10 (temperature when HCHO conversion achieved 10%) of r-Co3O4 NW@Ni foam catalysts (75 °C) was lower than that of Co3O4 NW@Ni foam catalysts (100 °C) and Co3O4 NP catalysts (132 °C). More importantly, the r-Co3O4 NW@Ni foam catalysts have more active oxygen species because of the promotional effects of surface oxygen vacancies. In situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTs) results revealed that the formate species were reaction intermediates of HCHO catalytic oxidation reactions. However, the formate species on the surface of r-Co3O4 NW@Ni foam catalysts were more active thus could easily take part in catalytic reactions. Furthermore, combined with the calculation results, the abundant surface oxygen vacancies could weaken O2 adsorption energy and make r-Co3O4 NW@Ni foam catalysts adsorb and store more active oxygen species, thus promoting more reaction intermediates to generate with a higher rate in redox cycles. The present investigations in this work may lead to an alternative development of high-performance monolith catalysts for VOC catalytic oxidation.
中文翻译：
镍泡沫上生长的Co 3 O 4纳米线高性能整体催化剂的见解，其中氧空位丰富，可用于甲醛氧化
在金属基材上生长的钴氧化物的整体催化剂在挥发性有机化合物（VOC）的氧化中表现出良好的催化性能，氧空位在活化中起关键作用。然而，很少有关于在整装催化剂中使用简便方法增加氧空位的报道。此外，氧空位对整体催化剂的促进作用的相应机理仍然不清楚。在这项工作中，合成了在Ni泡沫（r-Co 3 O 4 NW @ Ni泡沫）上原位生长的具有大量氧空位的Co 3 O 4纳米线，并将其用作甲醛催化氧化的高性能整体催化剂。钴3 O 4NW @ Ni泡沫催化剂显示出出色的催化活性和稳定性。r-Co 3 O 4 NW @ Ni泡沫催化剂（75°C）的T 10（HCHO转化率达到10％时的温度）低于Co 3 O 4 NW @ Ni泡沫催化剂（100°C）和Co 3 O 4 NP催化剂（132°C）。更重要的是，r-Co 3 O 4由于表面氧空位的促进作用，NW @ Ni泡沫催化剂具有更多的活性氧。原位漫反射红外光谱（原位DRIFTs）结果表明，甲酸盐是HCHO催化氧化反应的反应中间体。然而，r-Co 3 O 4 NW @ Ni泡沫催化剂表面的甲酸盐类活性较高，因此很容易参与催化反应。此外，结合计算结果，丰富的表面氧空位会削弱O 2的吸附能，使r-Co 3 O 4降低。NW @ Ni泡沫催化剂吸收并存储更多的活性氧，从而促进更多的反应中间体在氧化还原循环中以更高的速率生成。这项工作中的当前研究可能会导致用于VOC催化氧化的高性能整体式催化剂的替代发展。
更新日期：2020-09-23
中文翻译：
镍泡沫上生长的Co 3 O 4纳米线高性能整体催化剂的见解，其中氧空位丰富，可用于甲醛氧化
在金属基材上生长的钴氧化物的整体催化剂在挥发性有机化合物（VOC）的氧化中表现出良好的催化性能，氧空位在活化中起关键作用。然而，很少有关于在整装催化剂中使用简便方法增加氧空位的报道。此外，氧空位对整体催化剂的促进作用的相应机理仍然不清楚。在这项工作中，合成了在Ni泡沫（r-Co 3 O 4 NW @ Ni泡沫）上原位生长的具有大量氧空位的Co 3 O 4纳米线，并将其用作甲醛催化氧化的高性能整体催化剂。钴3 O 4NW @ Ni泡沫催化剂显示出出色的催化活性和稳定性。r-Co 3 O 4 NW @ Ni泡沫催化剂（75°C）的T 10（HCHO转化率达到10％时的温度）低于Co 3 O 4 NW @ Ni泡沫催化剂（100°C）和Co 3 O 4 NP催化剂（132°C）。更重要的是，r-Co 3 O 4由于表面氧空位的促进作用，NW @ Ni泡沫催化剂具有更多的活性氧。原位漫反射红外光谱（原位DRIFTs）结果表明，甲酸盐是HCHO催化氧化反应的反应中间体。然而，r-Co 3 O 4 NW @ Ni泡沫催化剂表面的甲酸盐类活性较高，因此很容易参与催化反应。此外，结合计算结果，丰富的表面氧空位会削弱O 2的吸附能，使r-Co 3 O 4降低。NW @ Ni泡沫催化剂吸收并存储更多的活性氧，从而促进更多的反应中间体在氧化还原循环中以更高的速率生成。这项工作中的当前研究可能会导致用于VOC催化氧化的高性能整体式催化剂的替代发展。
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