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在钴铝混合氧化物上合成用于乙醇氧化反应的金纳米颗粒。

Synthesis of Gold Nanoparticles over CoAl Mixed Oxide for Ethanol Oxidation Reaction.

作者信息

Rochard Guillaume, Genty Eric, Giraudon Jean-Marc, Poupin Christophe, Lamonier Jean-François, Siffert Stéphane, La Parola Valeria, Liotta Leonarda Francesca, Cousin Renaud

机构信息

Unité de Chimie Environnementale et Interactions sur le Vivant (UCEiV), Université du Littoral Côte d'Opale (ULCO), 59140 Dunkerque, France.

Unité de Catalyse et Chimie du Solide (UCCS), UMR 8181, Université de Lille, CNRS, Centrale Lille, Université Artois, 59000 Lille, France.

出版信息

Molecules. 2024 May 12;29(10):2285. doi: 10.3390/molecules29102285.

DOI:10.3390/molecules29102285
PMID:38792146
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11123866/
Abstract

Catalytic total oxidation is an effective technique for the treatment of industrial VOCs principally resulting from industrial processes using solvents and usually containing mono-aromatics (BTEX) and oxygenated compounds (acetone, ethanol, butanone). The aim of this work is to deposit gold nanoparticles on CoAl mixed oxide issued from layered double hydroxide (LDH) precursor by using the deposition precipitation (DP) method, which is applied with two modifications, labeled method (A) and method (B), in order to enhance the interaction of the HAuCl precursor with the support. Method (A) involves the hydrolysis of the HAuCl precursor after addition of the support, while in method (B), the gold precursor is hydrolyzed before adding the support. The two methods were applied using as support the CoAl mixed oxide and the LDH precursor. Samples were characterized by several physical chemical techniques and evaluated for ethanol total oxidation. Method (B) allowed the ethanol oxidation activity to be enhanced for the resulting Au/CoAlOx catalysts thanks to the high surface concentration of Co and improved reducibility at low temperature. The presence of gold permits to minimize the formation of by-products, notably, methanol, allowed for a total oxidation of ethanol at lower temperature than the corresponding support.

摘要

催化完全氧化是一种用于处理工业挥发性有机化合物（VOCs）的有效技术，这些VOCs主要源自使用溶剂的工业过程，通常含有单环芳烃（BTEX）和含氧化合物（丙酮、乙醇、丁酮）。本工作的目的是通过沉积沉淀（DP）法将金纳米颗粒沉积在由层状双氢氧化物（LDH）前驱体制备的CoAl混合氧化物上，该方法有两种改进形式，分别标记为方法（A）和方法（B），以增强HAuCl前驱体与载体之间的相互作用。方法（A）是在加入载体后使HAuCl前驱体水解，而在方法（B）中，金前驱体在加入载体之前水解。这两种方法均以CoAl混合氧化物和LDH前驱体作为载体进行应用。通过多种物理化学技术对样品进行了表征，并对乙醇的完全氧化进行了评估。由于所得Au/CoAlOx催化剂中Co的高表面浓度以及低温下改善的还原性，方法（B）提高了乙醇氧化活性。金的存在使副产物尤其是甲醇的生成量降至最低，使得乙醇在比相应载体更低的温度下实现完全氧化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/86c19e4cdc30/molecules-29-02285-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/86c19e4cdc30/molecules-29-02285-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/48a1cae41f00/molecules-29-02285-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/08451b1dc705/molecules-29-02285-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/6f2eab38da3c/molecules-29-02285-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/341050f5ef4e/molecules-29-02285-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a580/11123866/86c19e4cdc30/molecules-29-02285-g012.jpg

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本文引用的文献

1
Reducibility of Al-Modified CoO: Influence of Aluminum Distribution.铝改性CoO的还原性：铝分布的影响
Materials (Basel). 2023 Sep 14;16(18):6216. doi: 10.3390/ma16186216.
2
Oxidation of acetone over Co-based catalysts derived from hierarchical layer hydrotalcite: Influence of Co/Al molar ratios and calcination temperatures.层状水滑石衍生的钴基催化剂上丙酮氧化反应：Co/Al 摩尔比和煅烧温度的影响。
Chemosphere. 2018 Aug;204:257-266. doi: 10.1016/j.chemosphere.2018.03.198. Epub 2018 Mar 31.
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Deep oxidation of pollutants using gold deposited on a high surface area cobalt oxide prepared by a nanocasting route.
采用纳米铸型法制备的高表面积氧化钴负载金催化剂深度氧化污染物。
J Hazard Mater. 2011 Mar 15;187(1-3):544-52. doi: 10.1016/j.jhazmat.2011.01.073. Epub 2011 Jan 22.