TY - JOUR
T1 - Highly dispersed platinum in metal organic framework NH 2-MIL- 101(Al) containing phosphotungstic acid - Characterization and catalytic performance
AU - Ramos-Fernandez, Enrique V.
AU - Pieters, Cyriel
AU - Van Der Linden, Bart
AU - Juan-Alcañiz, Jana
AU - Serra-Crespo, Pablo
AU - Verhoeven, M. W.G.M.
AU - Niemantsverdriet, Hans
AU - Gascon Sabate, Jorge
AU - Kapteijn, Freek
PY - 2012/5
Y1 - 2012/5
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 NH 2-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 H 2, and the hydrogenation of toluene. Reduction at 473 K results in the formation of small Pt 0 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 CO 2 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 NH 2-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 H 2, and the hydrogenation of toluene. Reduction at 473 K results in the formation of small Pt 0 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 CO 2 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.
KW - CO oxidation
KW - Metal organic framework
KW - NH -MIL-101(Al)
KW - PROX
KW - Phosphotungstic acid
KW - Pt dispersion
UR - http://www.scopus.com/inward/record.url?scp=84859739635&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2012.01.013
DO - 10.1016/j.jcat.2012.01.013
M3 - Article
AN - SCOPUS:84859739635
SN - 0021-9517
VL - 289
SP - 42
EP - 52
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -