Ni-Mn spinel aerogel catalysts with adsorption induced superior activity for Low-Temperature toluene oxidation

尖晶石 气凝胶 甲苯 吸附 催化作用 化学 无机化学 化学工程 材料科学 有机化学 冶金 纳米技术 工程类
作者
Jiaqin He,Xunxun Li,Yaru Wang,Jun Xiao,Yunchong Liu,Hua Li,Najun Li,Qingfeng Xu,Jinghui He,Dongyun Chen,Jianmei Lu
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:454: 140039-140039 被引量:25
标识
DOI:10.1016/j.cej.2022.140039
摘要

• A series of Au-modified hollow Ni–Mn spinel decorated on GA catalysts is developed. • The hollow structure leads to a larger surface area and more active sites. • Au and GO strengthens the reducibility and adsorption capacity for toluene. • The catalyst shows great stability, moisture tolerance and compressibility. • An in-situ DRIFTS study and a modified MVK catalytic mechanism was proposed. The development of a highly efficient oxide catalyst is crucial for thermal and environmental catalytic reactions. Herein, a facile and eco-friendly strategy is developed to synthesize a series of Au-modified hollow Ni–Mn spinel nanospheres decorated on graphene aerogels (GAs) (termed Au y -hNi x Mn 3−x /GA z ) composite catalysts for deep catalytic oxidation of Volatile organic compounds (VOCs). The introduction of hollow structure leads to a larger specific surface area and more accessible active sites. The subsequent cooperation of Au further strengthens the low-temperature reducibility along with more active surface oxygen species. After being embedded into the graphene network, the composite catalyst shows an improvement in electron transfer and accessibility to active metal sites. The adsorption capacity of the catalyst for toluene is greatly improved by the above steps, thus facilitating the catalytic performance. The resulting Au 1 -hNi 1 Mn 2 /GA 0.5 composite catalyst exhibits optical activity for VOCs removal, reaching 100% toluene and benzene (500 ppm) oxidation at 155 °C and 148 °C, respectively. Meanwhile, the catalyst shows extraordinary catalytic stability, selectivity, moisture tolerance and compressibility making it a promising catalyst for industrial thermal catalysis. Moreover, an in situ DRIFTS study is carried out for the exploration of the reaction pathway and a modified Mars van Krevelen (MVK) catalytic mechanism was proposed as well.
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