The hydrogenation of CO2 was investigated on Ga2O3-promoted Pd/SiO2 catalyts and mechanical mixtures of Ga2O3/SiO2 and Pd/SiO2 catalysts (H2/CO2 = 3; P = 3.0 MPa; T = 523 K). By means of the latter it was possible to demonstrate that atomic hydrogen, H s , can be generated by Pd0 far from Ga2O3, and move (spill-over) there to reach the other reactive species (formates) and complete the reaction cycle. The reaction results indicate that (as also evidenced by in situ FTIR) the Ga2O3-Pd/SiO2 catalyst works as a true bi-functional system. The metal-promoter intimacy is not decisive in terms of the catalytic chemistry of the system, but the closeness between the Pd crystallites and the Ga2O3 surface patches boost the activity, owing to a minimized effort in the H s supply to the latter.
Similar content being viewed by others
References
L. Fan K. Fujimoto (1994) J. Catal. 150 217 Occurrence Handle10.1006/jcat.1994.1338
W.X. Pan R. Cao D.L. Roberts G.L. Griffin (1988) J. Catal. 114 440 Occurrence Handle10.1016/0021-9517(88)90047-4
G.C. Chinchen K.C. Waugh D.A. Wham (1986) Appl. Catal. 25 101 Occurrence Handle10.1016/S0166-9834(00)81226-9
T. Fujitani M. Saito Y. Kanai Y. Watanabe J. Nakamura T. Uchijima (1995) Appl. Catal. A: General 125 L199 Occurrence Handle10.1016/0926-860X(95)00049-6
T. Fujitani I. Nakamura (2002) Bull. Chem. Soc. Jpn. 75 1393 Occurrence Handle10.1246/bcsj.75.1393
A.L. Bonivardi D.L. Chiavassa C.A. Querini M.A. Baltanás (2000) Stud. Surf. Sci. Catal. 130 IssueIDD 3747
S.E. Collins M.A. Baltanás J.L. García Fierro A.L. Bonivardi (2002) J. Catal. 211 252
N. Iwasa T. Mayanagi N. Ogawa K. Sakata N. Takezawa (1998) Catal. Lett. 54 119 Occurrence Handle10.1023/A:1019056728333
N. Iwasa T. Mayanagi W. Nomura M. Arai N. Takezawa (2003) Appl. Catal. A: General 248 153 Occurrence Handle10.1016/S0926-860X(03)00184-4
B. Delmon, in: Spillover and Migration of Surface Species on Catalysis, eds. C. Li and Q. Xin (Elsevier Science, 1997)
G.M. Pajonk, Appl. Catal. A: General 202 (2000) 157, and references therein
S.E. Collins S.E. Baltanás A.L. Bonivardi (2005) Langmuir 21 962 Occurrence Handle10.1021/la0481389 Occurrence Handle15667175
A. Borgna, B. Moraweck, A.L. Bonivardi and M.A. Baltanás, unpublished results
S.E. Collins M.A. Baltanás A.L. Bonivardi (2004) J. Catal. 226 410 Occurrence Handle10.1016/j.jcat.2004.06.012
A. Erdöhelyi M. Pásztor F. Solymosi (1986) J. Catal. 98 166 Occurrence Handle10.1016/0021-9517(86)90306-4
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Collins, S.E., Chiavassa, D.L., Bonivardi, A.L. et al. Hydrogen Spillover in Ga2O3–Pd/SiO2 Catalysts for Methanol Synthesis from CO2/H2. Catal Lett 103, 83–88 (2005). https://doi.org/10.1007/s10562-005-6507-5
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10562-005-6507-5