Preparation of Au/TiO2 Catalyst and the Performance of Liquid Methanol Catalytic Oxidation to Formic Acid

Preparation of Au/TiO2 Catalyst and the Performance of Liquid Methanol Catalytic Oxidation to Formic Acid
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Au/TiO2催化剂的制备及液态甲醇催化氧化甲酸的性能

DOI:
10.1021/acs.iecr.7b02506
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发表时间:
2017-09
影响因子:
4.2
通讯作者:
Ji Shengfu
Ji Shengfu
中科院分区:
工程技术3区
文献类型:
--
作者:
Shi Da;Liu Jianfang;Ji Shengfu

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在tio2上负载金制备多相催化剂,并利用XRD、SEM-EDS、TEM和拉曼光谱对催化剂的结构进行了表征。采用金催化剂对甲醇水溶液的好氧氧化制甲酸进行了研究。结果表明,Au纳米粒子在tio2载体上高度分散,平均粒径为4.4nm。通过对反应温度、压力、碱用量、催化剂用量和反应时间的合理选择,在适宜的温度和压力下甲酸收率可达51.4%。初步研究了氧化途径的机理,甲醇脱氢制甲醛先发生,然后连续氧化制甲酸。该中间体产生的主要副产物是二氧化碳。
Loading gold on TiO 2 to prepare heterogeneous catalysts and use XRD, SEM-EDS, TEM and Raman to test the structure of the catalysts. The aerobic oxidation of aqueous methanol to produce formic acid was studied using gold catalysts. The results show that Au nanoparticles are highly dispersed on the TiO 2 supporter with 4.4nm average particle sizes. By proper selection of the reaction conditions about temperature, pressure, amount of base and catalysts and time, yield of 51.4% of formic acid could be achieved at moderate temperatures and pressures. The preliminary mechanism of the oxidation pathway was also studied that the dehydrogenation of methanol to produce formaldehyde happened at first and following the continuous oxidation to formic acid. The CO 2 as the major byproductwas produced from the intermediate.
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