A highly dispersed Pt/copper modified-MnO2 catalyst for the complete oxidation of volatile organic compounds: The effect of oxygen species on the catalytic mechanism

IF 14.6 1区工程技术 Q1 CHEMISTRY, PHYSICAL

Green Energy & Environment Pub Date : 2023-04-01 DOI:10.1016/j.gee.2021.07.004

Xunxun Li, Yaru Wang, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu

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引用次数: 10

Abstract

Manganese oxide (MnO₂) exhibits excellent activity for volatile organic compound oxidation. However, it is currently unknown whether lattice oxygen or adsorbed oxygen is more conducive to the progress of the catalytic reaction. In this study, novel hollow highly dispersed Pt/Copper modified-MnO₂ catalysts were fabricated. Cu²⁺ was stabilized into the δ-MnO₂ cladding substituting original K⁺, which produced lattice defects and enhance the content of adsorbed oxygen. The 2.03 wt% Pt Cu_0.050-MnO₂ catalyst exhibited the highest catalytic activity and excellent stability for toluene and benzene oxidation, with T₁₀₀ = 160 °C under high space velocity (36,000 mL g⁻¹ h⁻¹). The excellent performance of catalytic oxidation of VOCs is attributed to the abundant adsorbed oxygen content, excellent low-temperature reducibility and the synergistic catalytic effect between the Pt nanoparticles and Cu_0.050-MnO₂. This study provides a comprehensive understanding of the Langmuir–Hinshelwood (L-H) mechanism occurring on the catalysts.

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高分散Pt/铜改性MnO2催化剂完全氧化挥发性有机物：氧对催化机理的影响

氧化锰（MnO2）对挥发性有机化合物的氧化表现出优异的活性。然而，目前尚不清楚晶格氧还是吸附氧更有利于催化反应的进行。本研究制备了新型中空高分散Pt/铜改性MnO2催化剂。Cu2+取代原来的K+稳定在δ-MnO2包层中，产生晶格缺陷，提高了吸附氧的含量。2.03wt%的Pt-Cu0.050-MnO2催化剂对甲苯和苯的氧化表现出最高的催化活性和优异的稳定性，在高空速（36000 mL g−1 h−1）下T100=160°C。Pt纳米粒子与Cu0.050-MnO2之间具有丰富的吸附氧含量、优异的低温还原性以及协同催化作用，从而具有优异的催化氧化VOCs性能。本研究提供了对催化剂上发生的Langmuir–Hinshelwood（L-H）机制的全面理解。

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来源期刊

Green Energy & Environment Energy-Renewable Energy, Sustainability and the Environment

CiteScore

16.80

自引率

3.80%

发文量

332

审稿时长

12 days

期刊介绍： Green Energy & Environment (GEE) is an internationally recognized journal that undergoes a rigorous peer-review process. It focuses on interdisciplinary research related to green energy and the environment, covering a wide range of topics including biofuel and bioenergy, energy storage and networks, catalysis for sustainable processes, and materials for energy and the environment. GEE has a broad scope and encourages the submission of original and innovative research in both fundamental and engineering fields. Additionally, GEE serves as a platform for discussions, summaries, reviews, and previews of the impact of green energy on the eco-environment.