Pt nanoparticles supported over Ce–Ti–O: the solvothermal and photochemical approaches for the preparation of catalytic materials |
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Authors: | Adrián?M?T?Silva Bruno?F?Machado Helder?T?Gomes José?L?Figueiredo Goran?Dra?i? Joaquim?L?Faria |
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Institution: | 1.Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE/LCM, Departamento de Engenharia Química, Faculdade de Engenharia,Universidade do Porto,Porto,Portugal;2.Departamento de Tecnologia Química e Biológica,Escola Superior de Tecnologia e de Gest?o do Instituto Politécnico de Bragan?a,Bragan?a,Portugal;3.Department of Nanostructured Materials,Jozef Stefan Institute,Ljubljana,Slovenia |
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Abstract: | Ce–Ti–O supports with different Ce/Ti molar ratios were synthesized by the solvothermal method using hexadecyltrimethylammonium
bromide. Pt nanoparticles were then supported by photochemical deposition. The shape, size, and structure of these materials
were analyzed by high-resolution transmission electron microscopy. The single CeO2 support was also prepared, consisting of agglomerated cubic particles ranging from ~3 to 8 nm. When titania was combined
with ceria, a nanostructured architecture was produced, evidencing the strong influence of Ti in the support structure. Photodeposition
of Pt nanoparticles is more efficient on Ce–Ti–O supports than in pristine CeO2. Crystalline Pt nanoparticles (mainly of ~2 to 4 nm) were detected. The catalytic properties of the materials were tested
in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol. It was observed that Pt supported on Ce–Ti–O is more
active and selective than Pt on CeO2 or TiO2 separately. The catalyst with 40 mol% Ce leads to total conversion of cinnamaldehyde in a few minutes; however, higher selectivity
toward the desired product (cinnamyl alcohol) was obtained with higher amounts of Ce (50 mol%). |
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