In-situ preparation of molybdenum trioxide-silver composites for the improved photothermal catalytic performance of cyclohexane oxidation
In-situ preparation of molybdenum trioxide-silver composites for the improved photothermal catalytic performance of cyclohexane oxidation
复制标题
原位制备三氧化钼-银复合材料提高环己烷氧化光热催化性能
DOI：
10.1016/j.jcis.2020.07.015
复制
发表时间：
2020
影响因子：
9.9
通讯作者：
Fang Yanxiong
中科院分区：
文献类型：
--
作者：
Wang Xiaoyu;Feng Zhen;Liu Jincheng;Huang Zhilin;Zhang Jinhong;Mai Jijin;Fang Yanxiong
环己烷的选择性催化氧化具有重要的理论和实际应用价值。然而，高转化率和高选择性难以通过常规催化体系同时实现。本文以水合三氧化二钼酸为前驱体，甲酸为还原剂，采用水热法制备了具有氧空位的蓝色三氧化钼（MoO 3）纳米棒，并将原位生成的MoO 3-银（MoO 3-Ag）复合材料进一步用于以干燥空气为氧化剂的环己烷的光热催化氧化反应，实现了高转化率和高选择性。结果表明，环己酮和环己醇（KA油）的最佳转化率为8.6%，选择性为99.0%。MoO 3-Ag复合材料优异的催化性能归因于Ag纳米颗粒和氧空位的等离子体共振效应显著增加了可见光和近红外光的吸收，以及MoO 3-Ag肖特基异质结阻止了电荷复合。本工作为设计和制备用于烃类选择性氧化的高性能光热催化剂提供了新的参考方案。
The selective catalytic oxidation of cyclohexane has important theoretical and practical application value. However, high conversion rate and high selectivity are difficult to achieve simultaneously by conventional catalytic system. In this work, blue molybdenum trioxide (MoO3) nanorods with oxygen vacancies were prepared by hydrothermal method using hydrated molybdic acid as a precursor under the reduction of formic acid, and in-situ produced MoO3-silver (MoO3-Ag) composites were further used in the photothermal catalytic oxidation of cyclohexane with high conversion and high selectivity using dry air as oxidant. The results showed that the best conversion rate of cyclohexanone and cyclohexanol (KA oil) could reach 8.6% with the selectivity of 99.0%. The excellent catalytic performance of MoO3-Ag composites can be attributed to the significantly increased visible and near-infrared light absorption caused by the plasma resonance effect of Ag nanoparticles and oxygen vacancies, and the prevented charge recombination by MoO3-Ag Schottky heterojunction. This work provides new reference solutions for the design and preparation of high-performance photothermal catalysts for the selective oxidation of hydrocarbons.