Using SAXS for Determining the Sizes of Gold Nanoparticles in Au/C Catalysts: Advantages over Other Methods

IF 1.3 4区化学 Q4 CHEMISTRY, PHYSICAL

Kinetics and Catalysis Pub Date : 2023-12-12 DOI:10.1134/S0023158423060083

Yu. V. Larichev, B. L. Moroz, P. A. Pyrjaev, V. I. Bukhtiyarov

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Abstract

The advantages of using SAXS along with the masking liquid technique for determining the sizes of supported metal particles over the standard TEM and XRD methods, usually used for these purposes, were shown in the case of Au/C catalysts. Particle size distributions of gold in a wide range (1–50 nm) were obtained from the SAXS data, including for all size fractions present in the samples. The mass fractions of X-ray amorphous gold particles smaller than 4 nm (W_SAXS) were determined. The oxidative treatment of the carbon support before the deposition of the metallic gold precursor complexes has a significant effect on the size distribution of gold particles in the final catalyst. A comparison of the experimental rates of CO oxidation with an excess of moist air at 40°C on Au/C catalysts with the W_SAXS values found for these catalysts showed that the catalytic activity increased exponentially as W_SAXS increased. The Au/C catalysts with W_SAXS ≥ 80% showed high activity in the oxidation of CO.

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使用 SAXS 测定 Au/C 催化剂中金纳米粒子的尺寸：与其他方法相比的优势

摘要在 Au/C 催化剂中，使用 SAXS 和掩蔽液技术确定支撑金属颗粒的尺寸比通常使用的标准 TEM 和 XRD 方法更有优势。从 SAXS 数据中获得的金的粒度分布范围很广（1-50 纳米），包括样品中存在的所有粒度分数。还测定了小于 4 纳米的 X 射线无定形金颗粒的质量分数（WSAXS）。在沉积金属金前驱体复合物之前对碳载体进行氧化处理对最终催化剂中金颗粒的尺寸分布有显著影响。将 Au/C 催化剂在 40°C 下与过量潮湿空气进行 CO 氧化的实验速率与这些催化剂的 WSAXS 值进行比较后发现，催化活性随着 WSAXS 的增加而呈指数增长。WSAXS≥ 80% 的 Au/C 催化剂在 CO 氧化过程中表现出较高的活性。

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来源期刊

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.