Abstract
Mesoporous AlPO4 materials have attracted much attention in catalysis due to their high thermal and chemical stability. Of particular interest for catalysis is the pure stoichiometry high surface area (> 500 m2/g) mesoporous AlPO4 (mAlPO4) glass prepared via a template-free aqueous sol–gel synthetic route. Toward the application of this material for catalysis, we have developed methods for loading it with nanoparticles (NPs) of catalytic metals—Pd and Rh—and carried out a detailed characterization study of the resulting doped materials by a wide array of analytical methods, including synchrotron X-ray absorption spectroscopy, inelastic neutron scattering and more. The applicability of this material for catalysis, both by itself and as a support for catalytic NPs, was then evaluated. The pure mAlPO4 exhibited excellent acid-catalyzed [3 + 2] cycloaddition of nitriles and sodium azide. mAlPO4 loaded with the Pd NPs catalyzed very efficiently deoxygenation reactions of benzyl alcohols. mAlPO4 loaded with Rh NPs catalyzed with high selectivity, the hydrogenation of phenols and cresols and full conversion the hydrogenation of the industrially very high-volume toluene to methylcyclohexane. The materials-science aspects of these successful catalysts were studied in detail, leading, for instance, to the understanding of the important role of the interfacial Rh/Pd–O-P bonds.
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Acknowledgements
This study was funded by the National Natural Science Foundation of China (No. 52002384). The authors acknowledge the Diamond Light Source, UK (Project No. SP18835, B18 beamline), and the ISIS facility, UK (Project No. 1920102, TOSCA spectrometer), for the provision of beamtime. We thank Prof. B. Ji (Westlake U.), Prof. L. Chang (SIAP, CAS), Prof. J. Cui (Soochow U.) and Prof. J. Ren (SIOM, CAS) for the assistance in the materials characterization. J. H. acknowledges the Shanghai Pujiang Talent Plan (2020PJD079).
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He, J., Guo, W., Cong, P. et al. Exact stoichiometry high surface area mesoporous AlPO4 glass for efficient catalysis. J Mater Sci 57, 17234–17246 (2022). https://doi.org/10.1007/s10853-022-07577-y
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DOI: https://doi.org/10.1007/s10853-022-07577-y