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Fe-Doped Mesoporous Alumina: Facile One-Pot Synthesis, Modified Surface-Acidity and Its Enhanced Catalytic Performance in Phenol Hydroxylation

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Abstract

Fe-doped mesoporous alumina (MA) was successfully synthesized via a facile one-pot synthesis method. The resulting Fe-doped MA samples possess typical mesoporous structure, relatively high BET surface area, and narrowed pore size diameter. Besides, the iron species are well-dispersed in the alumina matrix, and more importantly, some small oligonuclear iron oxide clusters are linked on the surface of alumina, leading to the elimination of strong acid sites. The reaction of phenol hydroxylation was preceded at room temperature for 2 h. The introduction of mesoporous structure in alumina would be favorable for the adsorption and diffusion process of reactant and product molecules, and also the well-dispersed iron species in alumina matrix and large amount of acid sites stimulate more active hydroxyl radicals which are greatly beneficial for the catalytic process, especially the elimination of strong acid sites would inhibit the over-oxidation reaction. In this case, the sample of 5Fe–MA displays the best catalytic performance especially with the extremely high dihydroxybenzene selectivity of 93.2%, and the good catalytic stability is also evidenced by the five times recycling tests.

Graphic Abstract

In this work, the Fe-doped mesoporous alumina (MA) was successfully prepared. The iron species are well-dispersed in the alumina matrix, and some small oligonuclear iron oxide clusters are linked on the surface of alumina, leading to the elimination of strong acid sites. The advanced properties of mesoporous structure, well-dispersed metal active centers and lack of strong acid sites in Fe-doped MA are greatly beneficial for the catalytic process, especially for the dihydroxybenzene selectivity with extremely high value of 93.2%.

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Acknowledgements

This work was funded by the National Nature Science Foundation of China (51673040), the Natural Science Foundation of Jiangsu Province (BK20180366, BK20171357), the Fundamental Research Funds for the Central Universities (No. 3207048418), the Fundamental Research Funds for Central Universities (2242018k30008), the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (1107047002), the Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu (BA2018045), the Prospective Joint Research Project of Jiangsu Province (BY2016076-01), the Opening Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control (KF201605), and the Scientific Innovation Research Foundation of College Graduate in Jiangsu Province (KYLX16_0266).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Southeast University, Nanjing, 211189, People’s Republic of China

    Yongjuan Wang, Yuming Zhou, Man He, Qiang He & Yangyang Zhong

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  1. Yongjuan Wang
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  2. Yuming Zhou
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  3. Man He
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  4. Qiang He
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Correspondence to Yongjuan Wang or Yuming Zhou.

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Wang, Y., Zhou, Y., He, M. et al. Fe-Doped Mesoporous Alumina: Facile One-Pot Synthesis, Modified Surface-Acidity and Its Enhanced Catalytic Performance in Phenol Hydroxylation. Catal Lett 150, 2273–2282 (2020). https://doi.org/10.1007/s10562-020-03153-8

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