In situ designed monolithic catalysts possess a bright prospect in practical industrial catalytic applications owing to their strong anchoring force and lower pressure drop. In this study, a series of NiCo₂O₄ nickel foam-based monolithic catalysts were successfully prepared via an in situ electro-deposition strategy. The active phase was strongly and vertically anchored on a nickel foam, leading to a catalyst with a stable structure, abundant surface areas and an excellent electronic transmission capacity. Moreover, the as-prepared catalysts exhibited abundant structural defects, which can be attributed to the violent reaction rate. All the samples assuredly possessed excellent benzene oxidation performance, and the CoNi-NF-2 : 1 sample exhibited a superior activity, oxidizing about 90% of benzene (T₉₀) at 198 °C under a gaseous hourly space velocity (GHSV) of 6000 h⁻¹. A conclusion can be rationally drawn that the superior catalytic performance and the stability of the catalysts are primarily attributable to the strong anchoring force, rich oxygen vacancies, and the higher Co³⁺/Co²⁺ ratio according to the relevant characterizations. Furthermore, the benzene combustion mechanism was summarized by adequately studying the above conclusions and previous studies. This work indicates a promising strategy to design highly active monolithic catalysts with abundant defects, which potentially pave the way for the thorough removal of industrial benzene.

中文翻译：

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通过电沉积将NiCo2O4原位固定在泡沫镍上作为整体催化剂，以改善苯的燃烧性能

原位设计的整体催化剂由于其强大的锚固力和较低的压降而在实际的工业催化应用中具有广阔的前景。在这项研究中，一系列的镍钴的₂ ö ₄成功地制备了基于泡沫镍整体式催化剂经由一个原位电沉积策略。活性相牢固且垂直地锚固在泡沫镍上，从而得到具有稳定结构，丰富表面积和极佳电子传输能力的催化剂。此外，所制备的催化剂表现出丰富的结构缺陷，这可归因于剧烈的反应速率。确保所有样品均具有出色的苯氧化性能，并且CoNi-NF-2：1样品表现出优异的活性，在1600°C的气时空速（GHSV）下，于198°C氧化约90％的苯（T ₉₀）。 h ^-1。可以合理地得出结论，根据相关表征，优异的催化性能和催化剂的稳定性主要归因于强大的锚固力，丰富的氧空位和较高的Co ³⁺ / Co ²⁺比。此外，通过充分研究上述结论和先前的研究总结了苯的燃烧机理。这项工作表明设计具有大量缺陷的高活性整体催化剂的一种有前途的策略，这可能为彻底去除工业苯铺平道路。