Ordered dual mesoporous metal oxide composite material loaded with noble metal and preparation method thereof

Abstract

The invention belongs to the technical field of nanoporous materials, in particular to an ordered double mesoporous metal oxide composite material loaded with precious metals and a preparation method thereof. In the present invention, the amphiphilic block copolymer is used as the structure directing agent, and the hydroxyl group and mercapto group contained in the phenolic resin prepolymer containing mercapto group are used to interact with the metal oxide precursor and the noble metal precursor respectively, and the precursor is fixed on the block The hydrophilic end of the copolymer; after co-assembly induced by solvent volatilization, the block copolymer and the precursor complex form an ordered mesoscopic structure; after calcination, the organic components are removed, and the ordered double Mesoporous metal oxide composites. The composite material has a double mesoporous structure and a high specific surface area, and the mesoporous channels are arranged in an orderly manner and are uniformly loaded with noble metal nanoparticles. The method of the invention is simple, has strong universality, easy-to-obtain raw materials, is suitable for scale-up production, and has good application prospects in the fields of catalysis, sensing and the like.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and in particular relates to a preparation method of an ordered double mesoporous metal oxide composite material loaded with precious metals. Background technique [0002] In recent years, metal oxide composites loaded with precious metals have been widely used in energy conversion, catalysis, sensing and other fields due to their unique physical and chemical properties and synergistic effects, and have attracted extensive attention from researchers (S.Linic,P.Christopher, D.B. Ingram, Nat. Mater. 2011, 10, 911; C. Clavero, Nat. Photonics 2014, 8, 95; A.A. Herzing, C.J. Kiely, A.F. Carley, P. Landon, G.J. Hutchings, Science 2008, 321, 1331; W. Koo , S. Choi, S. Kim, J. Jang, H.L. Tuller, I. Kim, J. Am. Chem. Soc. 2016, 138, 13431). [0003] Loading noble metals into metal oxides with mesoporous structure is an effective way to improve the performance of noble metal / metal oxide compo...

AI Technical Summary

Problems solved by technology

At present, the synthesis of mesoporous metal oxides loaded with noble metals usually adopts the impregnation method or co-precipitation method, and the steps are complicated.

In the traditional impregnation method, the resistance of metal precursors to enter the porous carrier is relatively large, and noble metal species are easily adsorbed at the entrance of the pores, resulting in uneven loading; the co-precipitation method is difficult to control the structure and size of the pores, and the surface-modified noble metal Particles with surface ligands that are difficult to remove

At the same time, the currently reported mesoporous metal oxide composites loaded with noble metals usually have a single mesoporous structure, the size of the pore window is small, and the internal utilization efficiency of the material is low, which affects the further improvement of its performance (C.Y.Ma, Z.Mu, J.J.Li , Y.G.Jin, J.Cheng, G.Q.Lu, Z.P.Hao, S.Z.Qiao, J.Am.Chem.Soc.2010, 132, 2608; B.Liu, C.Kuo, J.Chen, Z.Luo, S.Thanneeru , W.Li, W.Song, S.Biswas, S.L.Suib, J.He, Angew.Chem.In.Ed.2015, 54, 9061; S.Kim, S.Choi, J.Jang, N.Kim, M.Hakim, H.L.Tuller, I.Kim, ACS Nano 2016, 10, 5891; Z.Jin, M.Xiao, Z.Bao, P.Wang, J.Wang, Angew.Chem.In.Ed.2012, 51 ,6406)

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