Abstract
TiO2 and Pt nanoparticles were deposited in the channels of siliceous MCM-48 via a sequential incipient wetness-impregnation method employing (NH4)2PtCl4 as platinum source. The resulting composite Pt/TiO2–MCM-48 (1 wt% Pt, ca. 3 wt% Ti) was characterized using XRD, TEM, nitrogen physisorption, hydrogen chemisorption, UV–vis spectroscopy, and XPS; its catalytic activity for CO oxidation was also explored. These data were compared with those of Pt/MCM-48 prepared via an analogous route. The results reveal that the platinum was deposited inside the intact pore system in both cases. It remains inside upon mild reduction but tends to segregate out of the pore system at higher reduction temperatures or during CO oxidation. Both composites were found to be highly active in CO oxidation, with 50% conversion at 460–475 K after activation of the unreduced catalysts in the (net oxidizing) feed. Striking differences in this activation process between Pt/MCM-48 and Pt/TiO2–MCM-48 suggest that the precursor reduction is influenced by an interaction with the TiO2 component in the latter.
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Beck JS, Vartuli JC, Roth WJ, Leonowicz ME, Kresge CT, Schmitt KD, Higgins JL, Schlenker JL (1992) J Am Chem Soc 114:10834
Kresge CT, Leonowicz ME, Roth WJ, Vartuli JC, Beck JS (1992) Nature 359:710
Sayari A (1996) Chem Mater 8:1840
Corma A (1997) Chem Rev 97:2373
Hoppe R, Ortlam A, Rathousky J, Schulz-Ekloff G, Zukal A (1997) Microporous Mater 8:267
Kinski I, Gies H, Marlow F (1997) Zeolites 19:375
Schulz-Ekloff G, Wöhrle D, van Duffel B, Schoonheydt RA (2002) Microporous Mesoporous Mater 51:91
On DT, Desplantier-Giscard D, Danumah C, Kaliaguine S (2001) Appl Catal A 222:299
Gies H, Grabowski S, Bandyopadhyay M, Grünert W, Tkachenko OP, Klementiev KV, Birkner A (2003) Microporous Mesopor Mater 60:31
van den Berg MWE, Polarz S, Tkachenko OP, Klementiev KV, Bandyopadhyay M, Khodeir L, Gies H, Muhler M, Grünert W (2006) J Catal 241:446
Bandyopadhyay M, Birkner A, van den Berg MWE, Klementiev KV, Schmidt W, Grünert W, Gies H (2005) Chem Mater 17:3820
Bandyopadhyay M, Korsak O, van den Berg MWE, Grünert W, Birkner A, Li W, Schüth F, Gies H (2006) Microporous Mesopor Mater 89:158
Narkhede VS, Toni AD, Narkhede VV, Guraya M, Niemantsverdriet JW, van den Berg MWE, Grünert W, Gies H (2009) Microporous Mesopor Mater 118:52
Tauster SJ, Fung SC, Garten RL (1978) J Am Chem Soc 100:170
Chatterjee M, Iwasaki T, Onadera Y, Nagase T (1999) Catal Lett 61:199
Jang JH, Lee SC, Kim DJ, Kang M, Choung SJ (2005) Appl Catal A 286:36
Kormann C, Bahnemann DW, Hoffmann MR (1988) J Phys Chem 92:5196
Moulder LF, Stickle WF, Sobol PE, Bomben KD (1992) Handbook of X-ray photoelectron spectroscopy. Perkin-Elmer Cooperation, USA
Katrib A, El-Egaby MS (1979) Inorg Chim Acta 36:L405
Elmasides C, Kontarides DI, Grünert W, Verykios XE (1999) J Phys Chem B 103:5227
Uchijima T (1996) Catal Today 28:105
Grünert W, Brückner A, Hofmeister H, Claus P (2004) J Phys Chem B 108:5709
Slinko MM, Jäger NI (1994) Stud Surf Sci Catal 86:1
Acknowledgements
We acknowledge financial support provided by the Deutsche Forschungsgemeinschaft in the frame of the Sonderforschungsbereich ‘‘Metal-substrate interactions in heterogeneous catalysis’’, SFB 558 (Projects B3 and A3). The authors are grateful to Ms. S. Buse for her help during chemisorption measurements.
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Narkhede, V.V., De Toni, A., Narkhede, V.S. et al. Pt nanoparticles inside the mesopores of TiO2–MCM-48: synthesis, characterization and catalytic activity for CO oxidation. J Mater Sci 44, 6701–6709 (2009). https://doi.org/10.1007/s10853-009-3602-9
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DOI: https://doi.org/10.1007/s10853-009-3602-9