镍钒复合光催化剂的光谱特征及其光催化性能  

Spectralsignatures of Nickel and Vanadium Supported Photocatalysts and Their Photocatalytic Properties

作　　者：海锋[1,2] 张前程[1] 王志伟 简丽[1] 

机构地区：[1]内蒙古工业大学,内蒙古自治区工业催化重点实验室,内蒙古呼和浩特010051 [2]解放军第253医院,内蒙古呼和浩特010051 [3]内蒙古自治区计量测试研究院,内蒙古呼和浩特010020

出　　处：《光谱学与光谱分析》2011年第4期1106-1109,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20966006);内蒙古自治区自然科学基金项目(2009MS0602);内蒙古自治区人才基金项目(2007)资助

摘　　要：以SiO2、活性炭(AC)和Al2O3为载体,采用浸渍法制备了Ni-V-O系负载光催化剂。考察了样品的光谱特征,并在紫外光下评价了样品在甲醇和CO2光催化反应中的性能;通过吡啶吸附FIIR和UV-Vis分析,结合反应测试结果,比较了催化剂载体对产物选择性的影响。XRD结果表明,在系列催化剂中,SiO2载体上的镍、钒粒子分散程度最高。吡啶吸附FIIR结果显示,系列催化剂表面存在L酸中心;相同的活性组分由于载体不同,所得到的负载催化剂表面酸度不同。负载催化剂表面L酸强度顺序为:Ni-V-O/SiO2>Ni-V-O/Al2O3>Ni-V-O/AC。不同酸度的催化剂,其上的羰基化产物甲酸甲酯(MF)和碳酸二甲酯(DMC)的选择性也不同。催化剂的表面酸强度是影响羰基产物选择性的主要因素。Using SiO2,activated carbon（AC） and Al2O3 as supports,the supported photocatalysts Ni-V-O/SiO2,Ni-V-O/AC and Ni-V-O/Al2O3 were prepared by impregnation method,and their spectralsignatures were investigated.The carbonylation of methanol with CO2 under UV irradiation was used as a probe reaction to compare the photocatalytic performance of the prepared catalysts.Integrated with the testing results of carbonylation,the effects of different supports on selectivity for the carbonylation products of methyl formate（MF） and dimethyl carbonate（DMC） were discussed by pyridine-IR and UV-Vis techniques.XRD results showed that the particles of nickel and vanadium supported on SiO2 had the highest degree of dispersion.Results of pyridine-IR indicated that all catalysts retained Lewis acid sites.The acid strength was different from catalyst samples with different supports but with the same active components.The acid strengths could be arranged as follows： Ni-V-O/SiO2Ni-V-O/Al2O3Ni-V-O/AC.Different acid strengths exhibited different influence on the selectivity of products MF and DMC of carbonylation.The surface acid strengths of catalysts were the major factor influencing the selectivity of carbonylation products.

关 键 词：复合光催化剂 光谱特征 羰基化反应 

分 类 号：O643[理学—物理化学]