Different reactive behaviours of dichloromethane over anatase TiO2 supported RuO2 and V2O5
Different reactive behaviours of dichloromethane over anatase TiO2 supported RuO2 and V2O5
复制标题
二氯甲烷在锐钛矿型 TiO2 负载 RuO2 和 V2O5 上的不同反应行为
DOI：
10.1016/j.cattod.2019.11.009
复制
发表时间：
2019
期刊：
影响因子：
5.3
通讯作者：
Xiang Gao
中科院分区：
文献类型：
--
作者：
Yang Yang;Hao Li;Shuo Zhang;Xinning Yu;Shaojun Liu;Ruiyang Qu;Chenghang Zheng;Xiang Gao
制备了以RuO 2和V2 O 5为活性组分的负载型TiO 2催化剂，并将其用于二氯甲烷（DCM）的催化分解。V2 O 5/TiO 2比RuO 2/TiO 2具有更高的CO选择性和更低的CH 3Cl选择性。进一步表征表明，V2 O 5的负载可以提高TiO 2的酸性，有利于DCM的吸附和C-Cl键的断裂，从而使其低温催化活性高于RuO 2/TiO 2。EDS和XRD分析结果表明，RuO 2团聚在TiO 2表面。因此，一部分DCM直接在TiO 2的裸露表面上分解，并导致产生CH 3Cl，其比CH 2Cl 2更稳定且难以分解。然而，RuO 2的负载大大提高了催化剂的氧化还原性能，通过丰富的表面氧物种，并促进深度氧化过程，以提高产品的CO2的选择性。最后，制备了RuO 2和V2 O 5/TiO 2催化剂，并将其用于DCM的催化分解。结果表明，RuO 2 &V2O5/TiO 2催化剂将氧化中心（RuO 2）与酸性中心（V2 O 5）偶联，在DCM分解中具有良好的应用前景。
Three catalysts with RuO2 and V2O5 as the active components loaded on anatase TiO2 were prepared and used for the catalytic decomposition of dichloromethane (DCM). The V2O5/TiO2 showed higher CO selectivity and lower CH3Cl selectivity than RuO2/TiO2. Further characterization of these samples demonstrated that the V2O5 loading can promote the acidity of TiO2, which is beneficial for the adsorption of DCM and cleavage of C-Cl bonds, thus leading to a higher low temperature catalytic activity than RuO2/TiO2. Meanwhile, the EDS-mapping and XRD results indicated that RuO2 agglomerated over the surface of anatase TiO2. Therefore, a portion of the DCM directly decomposed over the bare surface of TiO2 and led to the production of CH3Cl, which is more stable than CH2Cl2 and difficult to decompose. However, the loading of RuO2 greatly enhanced the redox properties of the catalyst by enriching the surface oxygen species and promoted the deep oxidation processes to improve the selectivity of the product to CO2. Finally, the RuO2&V2O5/TiO2 catalyst was synthesized and used for the decomposition of DCM. The results demonstrated that the RuO2&V2O5/TiO2, which coupled the oxidation centre (RuO2) with the acid centre (V2O5), shows wonderful prospects for application in DCM decomposition.