Pd-Pt/SiO2 催化剂有效催化氧化 VOC：双金属位点的协同催化,Journal of Environmental Chemical Engineering

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Pd-Pt/SiO2 催化剂有效催化氧化 VOC：双金属位点的协同催化
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2024-01-14 , DOI: 10.1016/j.jece.2024.111930
Jinglei Cui , Yujun Cui , Jingjing Tan , Huirong Zhang , Mengyuan Gu , Long Huang

挥发性有机化合物（VOC）是工业过程中产生的主要污染物之一。催化氧化是消除VOCs的有效方法，其关键在于设计高效的金属催化剂。本工作采用固定化法设计并制备了Pd-Pt/SiO双金属催化剂，并评价了其对甲苯氧化的性能。催化剂中添加Pt显着提高了Pd活性位点的还原，导致PdPt催化剂中出现丰富的缺电子Pd和富电子Pt，这一点通过TEM、CO脉冲吸附和原位XPS得到证实。O-TPD和甲苯-TPD表征表明，PdPt催化剂中缺电子Pd和富电子Pt的协同作用促进了O和甲苯的活化，从而大大提高了其活性。PdPt催化剂在165 ℃下对甲苯的转化率达到90%（T），并且PdPt催化剂的表观活化能（）低于其他Pd-Pt双金属和单金属Pd或Pt催化剂。另外，通过-DRIFTS对反应机理进行了研究，结果表明，甲苯氧化依次经过苯甲醇、苯甲醛、苯甲酸和马来酸酐，然后马来酸酐进一步氧化为CO和水。

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Efficient catalytic oxidation of VOCs by a Pd-Pt/SiO2 catalyst: The cooperative catalysis of dual metal sites

Volatile organic compounds (VOCs) are one of the main pollutants produced in industrial processes. Catalytic oxidation is an effective method to eliminate VOCs, and the key lies in designing efficient metal catalyst. In this work, Pd-Pt/SiO bimetallic catalysts were designed and prepared by the immobilization method, and their performances for toluene oxidation were evaluated. The addition of Pt into the catalyst elevated markedly the reduction of Pd active sites, leading to abundant electron-deficient Pd and electron-rich Pt in the PdPt catalyst, which were confirmed by TEM, CO pulse adsorption and in-situ XPS. As revealed by O-TPD and toluene-TPD characterization, the cooperative effect of electron-deficient Pd and electron-rich Pt in PdPt catalyst facilitated the activation of O and toluene, thus enhanced greatly its activity. A conversion of 90% (T) for toluene was achieved over PdPt catalyst at 165 ℃, and the apparent activation energy () over PdPt catalyst was lower than that over other Pd-Pt bimetallic and monometallic Pd or Pt catalysts. Additionally, the reaction mechanism was studied by - DRIFTS, the results showed that the toluene oxidation passed successively benzyl alcohol, benzaldehyde, benzoic acid and maleic anhydride, then maleic anhydride was further oxidized to CO and water.

更新日期：2024-01-14

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