摘要
针对传统光催化剂在可见光区域光捕获能力差、光催化效果不佳的问题,提出一种新型的光催化剂,并通过苯甲醇的选择性氧化反应对光催化剂的活性进行表征。实验结果表明,在光催化剂用量为50mg、溶剂为正己烷、Cs_(2)CO_(3)用量为1.6mmol的条件下,苯甲醇反应转化率达54.8%,选择性为99%;经多次循环后,本实验制备的光催化剂催化的苯甲醇转化率仍维持在47%左右,表现出良好的催化活性和催化循环稳定性。对光催化剂的催化机理进行分析,活性基团·OH、·O_(2)^(-)、e-和h+均在转化反应中发挥重要的催化作用,CBO/WO_(3)复合催化剂中,在CBO导带中的电子和WO_(3)价带中的空穴作用下,使得O_(2)形成·O_(2)^(-)、H_(2)O形成·OH,因此,复合催化剂可以提供更多的活性物种,促进反应的进行,提升反映效率。
view of the poor light capture ability and poor photocatalytic effect of traditional photocatalysts in the visible light region,a new type of photocatalyst was prepared and its activity was characterized by the selective oxidation of benzyl alcohol.The results showed that the conversion of benzyl alcohol was 54.8%and the selectivity was 99%under the conditions of 50 mg of photocatalyst,the solvent was n-hexane,and the amount and type of base were 1.6 mmol of cesium carbonate;After several cycles,the conversion rate of benzyl alcohol catalyzed by photocatalyst remains at about 47%,and the photocatalyst showed good catalytic activity and catalytic cycle stability.The catalytic mechanism of photocatalyst was analyzed.The active groups·OH、·O_(2)^(-)、e-and h+all play an important catalytic role in the conversion reaction.In the CBO/WO_(3)composite catalyst,the electrons in the CBO conduction band and the holes in the WO_(3)valence band make O_(2)form·O_(2)^(-)and H_(2)O form·OH.Therefore,the composite catalyst can provide more active species,promote the reaction and improve the reaction efficiency.
作者
唐贝
TANG Bei(Henan Vocational College of Applied Technology,Zhengzhou 450042,China)
出处
《化学工程师》
CAS
2023年第7期18-22,共5页
Chemical Engineer
基金
河南应用技术职业学院青年骨干教师资助项目(2022-GGJS-H006)。
关键词
光催化剂
选择氧化反应
光催化机理
反应转化率
photocatalyst
selective oxidation reaction
photocatalytic mechanism
reaction conversion
作者简介
唐贝(1984-),女,汉,河南济源人,讲师,2010年毕业于郑州大学有机化学专业,硕士研究生,研究方向:有机小分子催化与有机合成。
