Abstract

Recently, gold nanoparticles attracted an increased attention due to unusual and somewhat unexpected catalytic properties especially pronounced in the oxidation of some organic compounds. Gold nanoparticles, which was immobilized on powder Norit^® activated carbon as a support (1.0 wt % Au₁₀₁/AC) exhibited high activity and selectivity for benzyl alcohol oxidation particularly with the gold catalysts subjected to a specific type of activation and temperature. The interaction between Au₁₀₁ particles and its support was studied by measuring the catalytic activity and selectivity as a function of activation procedure. The first method included washing with a solvent (i.e., toluene) at elevated temperature, and/or followed by heat treatments at mild temperatures (i.e., 100 and 200°C for 3 h). The highest catalytic activity of benzyl alcohol oxidation was however obtained when gold catalysts were pre-washed with hot toluene at 100°C for 2 h followed by thermal treatment under vacuum. In these cases, the gold core diameters was ∼3.5 nm. In a number of experiments, the reaction time was 3 h, whereas in other runs it was extended to 24 h. The conversion level of benzyl alcohol oxidation was affected by the type of activation and its temperature related to the gold particles size.

中文翻译：

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活化的类型和温度对衍生形式的Au 101纳米催化剂催化活性的影响

摘要

最近，由于异常和有些出乎意料的催化性能，特别是在某些有机化合物的氧化中特别明显，金纳米颗粒引起了越来越多的关注。金纳米颗粒，将其固定在粉末诺芮特^®活性炭作为载体（1.0重量％的Au ₁₀₁ / AC）表现出对苯甲醇氧化具有高活性和选择性特别经受活化和温度的特定类型的金催化剂。Au ₁₀₁之间的相互作用通过测量催化活性和选择性与活化程序的关系，研究了颗粒及其载体。第一种方法包括在升高的温度下用溶剂（即甲苯）洗涤，和/或随后在温和的温度下（即100和200°C进行3小时）热处理。但是，将金催化剂在100°C下用热甲苯预洗涤2小时，然后在真空下进行热处理，可获得最高的苯甲醇氧化催化活性。在这些情况下，金芯直径为〜3.5 nm。在许多实验中，反应时间为3小时，而在其他实验中，反应时间延长至24小时。苯甲醇氧化的转化率受活化类型及其温度与金颗粒尺寸的关系。