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分散小尺寸Pt/Mg₂Al₄Si₅O₁₈作为一种高性能和强大的催化剂,用于甲净化

Fen Wang¹, Dajun Wu², Zhongao Zhang³

¹Anhui Provincial International Joint Research Center of Modern Environmental Engineering, Anhui University of Science and Technology, Huainan 232001, China; School of Chemical and Blasting Engineering, Anhui University of Science and Technology, Huainan 232001, China; Engineering Technology Research Center of Coal Resources Comprehensive Utilization, Anhui Province, Anhui University of Science and Technology, Huainan 232001, China; State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection, Huainan 232000, China.

Journal of colloid and interface science

|July 18, 2025

概括

氧化 (NiO) 改性使得在面积小的石上制备小型 (Pt) 纳米颗粒,以增强甲氧化. 这种NiO-Pt/cordierite催化剂在催化应用中表现出卓越的活性和稳定性.

科学领域:

材料科学材料科学材料科学
催化剂是一种催化剂.
环境化学环境化学

背景情况:

商业Mg2Al4Si5O18Cordierite由于其热稳定性而被用于催化.
矿的有限表面积阻碍了小型纳米粒子的制备.
氧化物 (NiO) 改造正在探索克服这些局限性.

研究的目的:

在使用NiO修饰的低表面积Mg$_{2}$Al$_{4}$Si$_{5}$O$_{18}$cordierit上制备小 (Pt) 纳米粒子.
研究NiO修饰对Pt/Mg$_{2}$Al$_{4}$Si$_{5}$O$_{18}$在甲氧化过程中的催化性能的影响.
阐明增强的催化活性背后的机制.

主要方法:

在NiO修饰的Mg2Al4Si5O18上制备Pt纳米粒子.
在特定条件下进行甲氧化催化试验 (60°C,WHSV=30,000mL/g·h,RH=25%).
综合性表征研究 (例如,分析Pt分散,O$_{2}$和HCHO吸附/激活,中间物种).

主要成果:

通过NiO修饰,在Mg$_{2}$Al$_{4}$Si$_{5}$O$_{18}$上制备了大约3纳米的Pt纳米粒子.
的修饰显著提高了Pt/Mg$_{2}$Al$_{4}$Si$_{5}$O$_{18}$催化剂的活性和稳定性.
用NiO修饰的催化剂 (6NiO-1Pt和9NiO-1Pt) 在20小时内实现了稳定的甲转化率,分别为91.596.7%和93.4100%.
Pt-NiO相互作用改善了Pt分散,O$_{2}$和HCHO吸附/激活,O$_{2}$流动性,以及二氧化甲中间体的吸附.

结论:

改性是一种有效的策略,可以提高Pt/Mg$_{2}$Al$_{4}$Si$_{5}$O$_{18}$的催化性能,用于甲氧化.
增强的性能归因于改善的Pt分散和Pt和NiO之间的协同效应,导致更好的反应剂吸附和激活.
提出了一种反应机制,该反应机制涉及甲氧化通过二氧化甲和酸盐中间体对改性催化剂进行氧化.

关键词:

甲甲氧化过程中的甲甲.互动互动互动互动 (Mg) (Al) (Si) (O) (O) (O) (Mg) (Al) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (Mg) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) (O) () () () () () () () () () ()尼奥尼奥是什么意思小尺寸的 Pt 纳米粒子.

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