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洞察改造的基于CeMn的催化剂,以通过in situ红外线有效降解二烯

Xuelian Li¹, Rujie Chen², Min Yang³

¹National Engineering Research Center for Fine Petrochemical Intermediates, and State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.

The Science of the total environment

|December 14, 2023

概括

用活性炭 (AC) 和藻土 (DE) 促进的新型Ce-Mn催化剂在低温下有效降解烯. 这些催化剂显示出增强的可还原性和氧气流动性,这对于完全氧化至关重要.

科学领域:

材料科学材料科学材料科学
环境化学环境化学
催化剂是一种催化剂.

背景情况:

像烯这样的挥发性有机化合物 (VOC) 构成环境和健康风险.
有效的催化氧化需要具有高可还原性和丰富的活性氧物种的催化剂.
活性炭 (AC) 和藻土 (DE) 可以在催化材料中充当有效的结构促进剂.

研究的目的:

开发和描述基于Ce-Mn的固体溶液催化剂,并使用AC和DE进行推广.
为了研究这些改性催化剂的催化性能,用于二烯氧化.
阐明反应机制并确定关键的中间体和产物.

主要方法:

催化剂合成的回氧沉方法.
将AC和DE纳入结构促进者的角色.
在现场DRIFTS (扩散反射红外富里埃变换光谱) 进行机械研究.
气相色谱 (GC) 用于产品分析.

主要成果:

与AC/DE一起推广的Ce-Mn基催化剂表现出优越的可还原性和丰富的Ce3+,Mn3+和活性氧物种.
修改后的催化剂 (Ce1Mn3Ox-AC/DE) 在 84°C (干燥) 和 123°C (10体积% H2O) 的低温下实现了 90% 的托卢烯去除.
在现场DRIFTS证实,二烯的降解遵循兰慕尔-欣舍尔伍德 (L-H) 和火星-范克雷文 (MvK) 机制,并确定了醇和酸等中间体.
催化剂证明了有效的低温氧化,不仅仅是吸附.

结论:

AC和DE有效地促进Ce-Mn固体溶液催化剂,增强二氧化.
催化剂表现出优异的低温性能,这是由于其优越的可还原性和氧气流动性.
这项研究提供了对托卢催化燃烧反应机制和途径的见解.

关键词:

结构性促进者结构性促进者热催化氧化热催化氧化托卢燃烧的燃烧方式挥发性有机化合物的降解降解

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