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用于将蒎烯可见光光氧化为香气含氧化合物的异质结构CeO-M（M = Co、Cu、Mn、Fe、Ni）氧化物纳米催化剂。

Heterostructured CeO-M (M = Co, Cu, Mn, Fe, Ni) Oxide Nanocatalysts for the Visible-Light Photooxidation of Pinene to Aroma Oxygenates.

作者信息

Mavuso Mlungisi A, Makgwane Peter R, Ray Suprakas Sinha

机构信息

Department of Chemical Sciences, University of Johannesburg, Doornfontein, 2028 Johannesburg, South Africa.

Centre for Nanostructures and Advanced Materials, Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa.

出版信息

ACS Omega. 2020 Apr 23;5(17):9775-9788. doi: 10.1021/acsomega.9b04396. eCollection 2020 May 5.

DOI:10.1021/acsomega.9b04396
PMID:32391465
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7203698/
Abstract

Herein, we report the enhanced photocatalytic activity of heterostructured CeO nanocatalysts interfaced with Cu, Co, Ni, Mn, and Fe metal oxides. The CeO catalysts exhibited an enhanced red shift in the visible-light response compared to CeO. This improved absorption range effectively suppressed electron (e)/hole (h) recombination by forming localized energy bands associated with defect oxygen vacancies ( ) induced by the M ions incorporated in CeO. Under visible-light irradiation, CeO catalysts are active for α-pinene oxidation to the aroma oxygenates, pinene oxide, verbenol, and verbenone. Both FeO-CeO and NiO-CeO gave the highest pinene conversions of 71.3 and 53.1%, respectively, with corresponding pinene oxide selectivities of 57.3 and 58.2%. The enhanced photocatalytic performance of the heterostructured CeO catalysts compared to CeO is attributed to their enhanced visible-light absorption range and efficient suppression of e/h recombination. The FeO-CeO catalyst was highly recyclable and did not show any significant loss of its photoactivity.

摘要

在此，我们报道了与铜、钴、镍、锰和铁金属氧化物界面结合的异质结构CeO纳米催化剂增强的光催化活性。与CeO相比，CeO催化剂在可见光响应中表现出增强的红移。这种改善的吸收范围通过形成与CeO中掺入的M离子诱导的缺陷氧空位相关的局域能带，有效地抑制了电子（e）/空穴（h）复合。在可见光照射下，CeO催化剂对α-蒎烯氧化为芳香族含氧化合物、氧化蒎烯、马鞭草烯醇和马鞭草烯酮具有活性。FeO-CeO和NiO-CeO的蒎烯转化率最高，分别为71.3%和53.1%，相应的氧化蒎烯选择性分别为57.3%和58.2%。与CeO相比，异质结构CeO催化剂光催化性能的增强归因于其增强的可见光吸收范围和对e/h复合的有效抑制。FeO-CeO催化剂具有高度可回收性，并且其光活性没有任何明显损失。

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