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构建具有大比表面积介孔CeO纳米球载体的高效CuO基CO氧化催化剂。

Constructing Efficient CuO-Based CO Oxidation Catalysts with Large Specific Surface Area Mesoporous CeO Nanosphere Support.

作者信息

Zhang Yixin, Zhao Fen, Yang Hui, Yin Siyuan, Wu Cai-E, Zhou Tingting, Xu Jingxin, Xu Leilei, Chen Mindong

机构信息

Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Joint International Research Laboratory of Climate and Environment Change (ILCEC), Nanjing 210044, China.

College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China.

出版信息

Nanomaterials (Basel). 2024 Mar 7;14(6):485. doi: 10.3390/nano14060485.

DOI:10.3390/nano14060485
PMID:38535633
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10974734/
Abstract

CeO is an outstanding support commonly used for the CuO-based CO oxidation catalysts due to its excellent redox property and oxygen storage-release property. However, the inherently small specific surface area of CeO support restricts the further enhancement of its catalytic performance. In this work, the novel mesoporous CeO nanosphere with a large specific surface area (~190.4 m/g) was facilely synthesized by the improved hydrothermal method. The large specific surface area of mesoporous CeO nanosphere could be successfully maintained even at high temperatures up to 500 °C, exhibiting excellent thermal stability. Then, a series of CuO-based CO oxidation catalysts were prepared with the mesoporous CeO nanosphere as the support. The large surface area of the mesoporous CeO nanosphere support could greatly promote the dispersion of CuO active sites. The effects of the CuO loading amount, the calcination temperature, mesostructure, and redox property on the performances of CO oxidation were systematically investigated. It was found that high Cu concentration and lattice oxygen content in mesoporous CuO/CeO nanosphere catalysts greatly contributed to enhancing the performances of CO oxidation. Therefore, the present mesoporous CeO nanosphere with its large specific surface area was considered a promising support for advanced CO oxidation and even other industrial catalysts.

摘要

CeO是一种杰出的载体，由于其优异的氧化还原性能和氧存储-释放性能，常用于基于CuO的CO氧化催化剂。然而，CeO载体固有的小比表面积限制了其催化性能的进一步提高。在本工作中，通过改进的水热法轻松合成了具有大比表面积（约190.4 m²/g）的新型介孔CeO纳米球。介孔CeO纳米球的大比表面积即使在高达500℃的高温下也能成功保持，表现出优异的热稳定性。然后，以介孔CeO纳米球为载体制备了一系列基于CuO的CO氧化催化剂。介孔CeO纳米球载体的大表面积可极大地促进CuO活性位点的分散。系统研究了CuO负载量、煅烧温度、介孔结构和氧化还原性能对CO氧化性能的影响。结果发现，介孔CuO/CeO纳米球催化剂中的高Cu浓度和晶格氧含量对提高CO氧化性能有很大贡献。因此，目前具有大比表面积的介孔CeO纳米球被认为是用于先进CO氧化乃至其他工业催化剂的有前途的载体。

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