Investigation of the by-product selectivity of industrialized support for the catalytic elimination of o-DCB over Pt-catalysts

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2024-09-11 DOI:10.1016/j.micromeso.2024.113334

Peng Wang , Shuyun Ding , Shilin Wu, Ningjie Fang, Qiongyue Zhang, Yinghao Chu

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引用次数: 0

Abstract

For chlorinated volatile organic compounds (CVOCs), it is critical to design and fabricate applicable noble metal catalysts to exhibit superior catalytic performance in catalytic oxidation under both dry air and 5.0 vol% H₂O conditions. In pursuit of this goal, a facile strategy was developed to prepare a series of Pt-supported catalysts for the elimination of o-dichlorobenzene (o-DCB). Among these catalysts, Pt/CeAlZrO_x possessed excellent activity (T₉₀ = 285 °C) and Pt/LaAlO_x showed outstanding selectivity within/without 5.0 vol% H₂O, attributed to the strong interaction of multi-components, abundance of adsorbed oxygen, prominent redox properties, and suitable acidity. According to the analysis results of density functional theory (DFT), the introduction of Pt can significantly improve the adsorption and activation of o-DCB molecules on the catalysts. Specifically, the action of Marse-van Krevelen (MvK) combining with Langmuir-Hinshelwood (L-H) mechanism was proposed. In general, this work provides promising candidates and valuable insights into the comprehensive improvement of o-DCB catalytic degradation for industrial application.

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工业化支持物在铂催化剂上催化消除邻二氯苯的副产物选择性研究

对于氯化挥发性有机化合物 (CVOC) 而言，设计和制造适用的贵金属催化剂，使其在干燥空气和 5.0 vol% H2O 条件下的催化氧化过程中表现出卓越的催化性能至关重要。为了实现这一目标，我们开发了一种简便的策略，制备了一系列用于消除邻二氯苯（o-DCB）的铂支撑催化剂。在这些催化剂中，Pt/CeAlZrOx 具有优异的活性（T90 = 285 °C），Pt/LaAlOx 在 5.0 vol% H2O 内/外均表现出卓越的选择性，这归功于多组分的强相互作用、丰富的吸附氧、突出的氧化还原特性和合适的酸性。根据密度泛函理论（DFT）的分析结果，铂的引入能显著改善催化剂对邻二氯苯分子的吸附和活化。具体而言，该研究提出了马斯-范-克雷维伦（MvK）作用与朗缪尔-欣舍伍德（L-H）机理相结合的机制。总之，这项工作为全面改进邻二氯苯催化降解的工业应用提供了有希望的候选物质和有价值的见解。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.