Issue 43, 2021

High-precision synthesis of α-MnO2 nanowires with controllable crystal facets for propane oxidation

Abstract

Determining the effect of crystal facets on reaction performance is essential for designing an efficient propane oxidation catalyst. Herein, α-MnO2 nanowires with exposed (110), (211), (310) and (200) facets were proposed, and their crystal facet-dependent reactivity to propane oxidation was investigated. The resultant α-MnO2 nanowires with predominantly exposed (110) facets showed the maximum propane oxidation activity (T90 = 262.1 °C), oxidation rate, and turnover frequency (at 230 °C), and high stability during the oxidation of propane. In situ diffuse reflectance infrared Fourier transform spectroscopy revealed that the oxidation to form carboxylates is the decisive step; therefore, the production of reactive oxygen species is very important. The results from density of states computations revealed that the lowest electron energy was present in the (110) facet, which helps in the generation of reactive oxygen species and the regulation of the surface valence of Mn. The characterization and calculation results indicated that the (110) facets are conducive to forming oxygen vacancies, which allowed the activation and adsorption of O2 and propane, resulting in significantly enhanced propane oxidation activity. Apart from offering new insights about the structure–activity relationship of α-MnO2 with different facets exposed for short-chain volatile oxidation reactions, this study proposes a technique that can be used for improving other manganese-based catalyst oxidation systems.

Graphical abstract: High-precision synthesis of α-MnO2 nanowires with controllable crystal facets for propane oxidation

Supplementary files

Article information

Article type
Paper
Submitted
08 Mha 2021
Accepted
03 Nhl 2021
First published
04 Nhl 2021

CrystEngComm, 2021,23, 7602-7614

High-precision synthesis of α-MnO2 nanowires with controllable crystal facets for propane oxidation

C. Feng, G. Xiong, Y. Li, Q. Gao, Y. Pan, Z. Fei, Y. Li, Y. Lu, C. Liu and Y. Liu, CrystEngComm, 2021, 23, 7602 DOI: 10.1039/D1CE01044A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements