TY - JOUR
T1 - Highly dispersed platinum in metal organic framework NH2-MIL-101(Al) containing phosphotungstic acid - Characterization and catalytic performance
AU - Ramos-Fernandez, E.V.
AU - Pieters, Cyriel
AU - Linden, van der, B.
AU - Juan-Alcaniz, J.
AU - Serra-Crespo, P.
AU - Verhoeven, M.W.G.M.
AU - Niemantsverdriet, J.W.
AU - Gascon, J.
AU - Kapteijn, F.
PY - 2012
Y1 - 2012
N2 - The synthesis, characterization (FT-IR, XPS, NMR, UV–Vis), and catalytic performance of Pt supported on phosphotungstic acid (PTA) encapsulated in a metal organic framework (MOF) are reported. The highly dispersed Keggin units of PTA in NH2-MIL-101(Al), synthesized in one step, act as anchoring sites for the Pt precursor species. After different post-treatments, the resulting catalysts have been tested in the oxidation of CO, the preferential oxidation of CO in the presence of H2, and the hydrogenation of toluene. Reduction at 473 K results in the formation of small Pt0 clusters and Pt^2+ species. Reduction at 573 K induces the formation of intermetallic Pt–W^5+ species, which exhibit the best CO oxidation activity and a higher selectivity toward CO2 than alumina supported Pt, resembling the combination of a noble metal on a reducible support. In toluene hydrogenation, the MOF catalysts perform worse than Pt on alumina, ascribed to the too small size of the Pt clusters in the MOF catalysts.
AB - The synthesis, characterization (FT-IR, XPS, NMR, UV–Vis), and catalytic performance of Pt supported on phosphotungstic acid (PTA) encapsulated in a metal organic framework (MOF) are reported. The highly dispersed Keggin units of PTA in NH2-MIL-101(Al), synthesized in one step, act as anchoring sites for the Pt precursor species. After different post-treatments, the resulting catalysts have been tested in the oxidation of CO, the preferential oxidation of CO in the presence of H2, and the hydrogenation of toluene. Reduction at 473 K results in the formation of small Pt0 clusters and Pt^2+ species. Reduction at 573 K induces the formation of intermetallic Pt–W^5+ species, which exhibit the best CO oxidation activity and a higher selectivity toward CO2 than alumina supported Pt, resembling the combination of a noble metal on a reducible support. In toluene hydrogenation, the MOF catalysts perform worse than Pt on alumina, ascribed to the too small size of the Pt clusters in the MOF catalysts.
U2 - 10.1016/j.jcat.2012.01.013
DO - 10.1016/j.jcat.2012.01.013
M3 - Article
SN - 0021-9517
VL - 289
SP - 42
EP - 52
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -