镍钒复合催化剂的制备及其光催化性能

Preparation of nickel-vanadium catalysts and their photocatalytic performance

摘要:

浸渍法制备了Ni-V-O/SiO2催化剂，并对其进行了XRD、UV-Vis和吡啶吸附FT-IR等表征。在紫外光下考察了催化剂处理温度和Ni-V质量比对甲醇和CO2光催化羰基化性能的影响。结果表明，m(Ni):m(V)=6:4并60 ℃处理的催化剂对羰基化产物甲酸甲酯（MF）和碳酸二甲酯（DMC）的总选择性达到了77.6%。吡啶吸附红外光谱表征结果显示样品表面存在L酸性位，计算结果表明表面L酸的含量达到了1.85 mmol/g。催化剂的表面L酸强度是影响羰基产物选择性的主要因素。

Abstract:

Ni-V-O/SiO2 catalysts were prepared by impregnation methods and characterized by XRD, UV-Vis and pyridine adsorbed FTIR. The effects of treatment temperature and Ni-V ratio of the catalysts on photocatalytic catalysis of carbonylation for methonal with carbondioxide were investigated under UV irradiation. The results indicated that the selectivity of methyl formate (MF) and dimethyl carbonate (DMC) could be up to 77.6% when the catalyst with 6:4 of Ni-V ratio was treated at 60 °C. Pyridine-FTIR analyses revealed that the catalyst surface contained Lewis acid sites and the acid content obtained by calculation was 1.85 mmol/g. The surface L acid strength was the major factor to influence the selectivity of carbonylation products.