NaBH4 还原锰掺杂四氧化三钴 R-MnxCo3−xO4 催化剂，具有大量氧空位，用于 HCHO 低温氧化,New Journal of Chemistry

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NaBH4 还原锰掺杂四氧化三钴 R-MnxCo3−xO4 催化剂，具有大量氧空位，用于 HCHO 低温氧化
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2024-04-03 , DOI: 10.1039/d4nj00742e
Gang Yan ₁ , Xiaojun Du ₁ , Xiangwei Guo ₂ , Xuzheng Cao ₁ , Hongfei Shi ₃

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开发低成本、高效的甲醛 (HCHO) 氧化催化剂对于保护环境至关重要。这项研究的主要挑战是如何开发一种高效、稳定且廉价的能够在低温下氧化 HCHO 的催化剂。本文中，通过简单的共沉淀和退火处理，然后还原NaBH ₄制备了还原的Mn掺杂四氧化钴R-Mn _x Co _{3− x} O ₄催化剂。制备的R-Mn _x Co ₃₋_x O ₄在低温下表现出显着增强的HCHO氧化活性。 R-MnCo ₂ O ₄催化剂可在50℃低温下氧化分解79%的HCHO，表现出优异的催化稳定性。催化活性的提高可归因于氧空位浓度的增加和氧化还原性能的提高。 TGA测试表明，R-MnCo ₂ O ₄催化剂中氧空位含量可达5.77%（原子比）。 H ₂ -TPR、O ₂ -TPD和O ₂ -TPO测试表明，表面氧空位可以促进氧迁移，并有利于甲醛催化氧化过程中活性氧的形成。该研究揭示了表面氧空位在提高催化剂催化氧化活性中的重要性，为通过原子掺杂和还原改性开发高性能催化剂提供了可能。

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NaBH4 reduced Mn-doped cobalt tetroxide R-MnxCo3−xO4 catalysts with plentiful oxygen vacancies for HCHO oxidation at low temperature

Developing low-cost and efficient catalysts for the oxidation of formaldehyde (HCHO) is crucial for preservation of the environment. The main challenge of this study is how to develop an efficient, stable, and inexpensive catalyst that can oxidize HCHO at low temperatures. Herein, the reduced Mn-doped cobalt tetroxide R-Mn_xCo_3−xO₄ catalyst was prepared by simple co-precipitation and annealing treatment followed by reduction of NaBH₄. The prepared R-Mn_xCo_3−xO₄ showed remarkable enhanced activity for HCHO oxidation at low temperature. The R-MnCo₂O₄ catalyst can oxidize and decompose 79% of HCHO at a low temperature of 50 °C and exhibits excellent catalytic stability. The improved catalytic activity can be attributed to the increase in oxygen vacancy concentration and the improvement in redox performance. The TGA test shows that the content of oxygen vacancies in the R-MnCo₂O₄ catalyst can reach 5.77% (atomic ratio). The H₂-TPR, O₂-TPD and O₂-TPO tests indicated that the surface oxygen vacancies can promote oxygen mobility and facilitate the formation of reactive oxygen species during the formaldehyde catalytic oxidation process. This study reveals the importance of surface oxygen vacancies in improving the catalytic oxidation activity of catalysts, providing possibilities for the development of high-performance catalysts through atomic doping and reduction modification.

更新日期：2024-04-03

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