Abstract
The concept that catalytic turnover occurs at a small fraction of the surface sites dates back to the 1920s. The application of modern surface science techniques and model catalysts confirmed the presence of active sites and identified their structures in some cases. Low coordination defect sites on transition metals, steps and kinks, or open “rough” crystal faces that make high coordination metal sites available have been uniquely active for breaking H–H, C–H, C–C, C=O, O=O and N≡N bonds. Oxide–metal interfaces provide highly active sites for reactions of C–H and C=O bonds. Electron acceptor and proton donor sites are implicated in hydrocarbon conversion (acid–base catalysis), and sites where metal ion–carbon bonds can form are active for polymerization. The observations of dynamic restructuring of catalytic surfaces upon adsorption of reactants indicate that many catalytic sites are created during the chemical reaction. Similar restructuring is detected for enzyme catalysts. The high mobility of both surface metal atoms and adsorbed molecules during the catalytic process observed recently bring into focus the dynamic nature of active sites that may have a finite lifetime as they form and disassemble. The development of techniques that provide improved time resolution and spatial resolution, and can be employed under catalytic reaction conditions will provide information about the time dependent changes of active site structure and molecular intermediates at these active sites as the reaction products form.
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References
H.S. Taylor, Proc. Roy. Soc. A 108 (1925) 105.
J.A. Osborne, F.H. Jardine, J.F. Young and Wilkinson, Chem. Commun. 17 (1965) 131.
S.L. Bernasek, W.J. Siekhaus and G.A. Somorjai, Phys. Rev. Lett. 30 (1973) 1202.
S.L. Bernasek and G.A. Somorjai, J. Chem. Phys. 62 (1975) 3149.
G.A. Somorjai, M. Salmeron and R.J. Gale, J. Chem. Phys. 2807 (1979) 70.
R.J. Gale, M. Salmeron and G.A. Somorjai, Phys. Rev. Lett. 48 (1977) 1027.
R.J. Gale, M. Salmeron and G.A. Somorjai, J. Chem. Phys. 67 (1977) 5324.
B.C. Stipe, M.A. Rezaei, W. Ho, S. Gao, M. Persson and B.I. Lundqvist, Phys. Rev. Lett. 78 23 (1997) 4410.
R.K. Grasselli and J.D. Burrington, Adv. Catal. 30 (1981) 133.
P. Biloen, F.M. Dantzenberg and W.M.H. Sachtler, J. Catal. 50 (1977) 77.
D.W. Blakely and G.A. Somorjai, J. Catal. 42 (1976) 181.
D.W. Blakely and G.A. Somorjai, Nature 258 (1975) 580.
S.M. Davis and G.A. Somorjai, Surf. Sci. 91 (1980) 73.
S.M. Davis, F. Zaera and G.A. Somorjai, J. Am. Chem. Soc. 104 (1982) 7453.
C.N.R. Rao and G. Ranga, Surf. Sci. Rep. 13 (1991) 221, and references therein.
A. Ozaki and K. Aika, in: Catalysis: Science and Technology,Vol.1, eds. J.R. Anderson and M. Boudart (Springer, Berlin, 1981).
D.R. Strongin, J. Carraza, S.R. Bare and G.A. Somorjai, J. Catal. 103 (1987) 213.
J.A. Dumesic, H. Topsøe and M. Boudart, J. Catal. 37 (1975) 513.
N.D. Spencer, R.C. Schoonmaker and G.A. Somorjai, J. Catal. 74 (1982) 129.
G.A. Somorjai and Y. Borodko, Catal. Lett. 59 (1999) 89.
H. Beinert, R.H. Holm and E. Munck, Science 277 (1997) 653.
M.C. Kennedy, T.A. Kent, M. Emptage, H. Merklet, H. Beinert and E. Munck, J. Biol. Chem. 259 (1984) 14463.
J.B. Howard and D.C. Rees, Chem. Rev. 96 (1996) 2965.
J. Kim and D.C. Rees, Nature 360 (1992) 553.
J.T. Bolin, A.E. Ronco, T.V. Morgan, L.E. Martenson and N.H. Xuong, Proc. Natl. Acad. Sci. 98 (1993) 1078.
D.E. Eastman, J.E. Demuth and J.M. Baker, J. Vac. Sci. Technol. 11 (1974) 273.
W. Erley and H. Wagner, Surf. Sci. 74 (1978) 333.
I. Murayama, I. Kojima, E. Miyazaki and I. Yasumori, Surf. Sci. 118 (1982) L28.
R. Rosel, F. Ciccacci, R. Memeo, C. Mariani, L.S. Caputi and L. Papagno, J. Catal. 83 (1983) 19.
C. Astaldi, A. Santoni, F. Della Valle and R. Rosel, Surf. Sci. 220 (1989) 322.
Y. Iwasawa, R. Mason and G.A. Somorjai, Chem. Phys. Lett. 44 (1976) 468.
B. Lang, R.W. Joyner and G.A. Somorjai, Surf. Sci. 30 (1972) 454.
Y.O. Park, W.F. Banholzer and R.I. Masel, Surf. Sci. 155 (1985) 341.
K.Y. Kung, P. Chen and G.A. Somorjai, Surf. Sci., to be published.
E.A. Wovchko and J.T. Yates, J. Am. Chem. Soc. 118 (1996) 10250.
N. Kruse and A. Gaussman, Surf. Sci. 266 (1992) 51.
B.J. McIntyre, M. Salmeron and G.A. Somorjai, J. Vac. Sci. Technol. A 11 (1993) 1964.
R. Burch and A.R. Flambard, J. Catal. 86 (1982) 384.
A. Boffa, C. Lin, A.T. Bell and G.A. Somorjai, J. Catal. 149 (1994) 149.
W.M.H. Sachtler and M. Ichikawa, J. Phys. Chem. 90 (1986) 4752.
W.M.H. Sachtler, D.F. Shriver, W.B. Hollenberg and A.F. Long, J. Catal. 92 (1985) 429.
G.A. Somorjai, T.S. Oyama, G.T. Went, K.B. Lewis and A.T. Bell, J. Phys. Chem. 93 (1989) 6786.
G.L. Haller and D.E. Resasco, Adv. Catal. 36 (1989) 173.
I. Mochida, I. Nobuhide, H. Ishibashi and H. Fujitsu, J. Catal. 110 (1988) 159.
T. Iizuka, Y. Tanaka and K. Tanabe, J. Mol. Catal. 17 (1982) 381.
A. Trovarelli, C. Mustazza, G. Dolcetti, J. Kaspar and M. Graziani, Appl. Catal. 65 (1990) 129.
S.J. Tauster, Acc. Chem. Res. 20 (1987) 389.
A.T. Bell, Catalyst Design - Progress and Perspectives, ed. L.L. Hegedus (Wiley, New York, 1987).
A.M. Wander, M.A. van Hove and G.A. Somorjai, Phys. Rev. Lett. 67 (1991) 626.
G.A. Somorjai and G. Rupprechter, in: Dynamics of Surfaces and Reaction Kinetics in Heterogeneous Catalysis, Stud. Surf. Sci. Catal., Vol. 109, eds. G.F. Froment and K. Waugh (Elsevier, 1997) p. 35.
L.L. Kesmodel, P.C. Stair, R.C. Baetzold and G.A. Somorjai, Phys. Rev. Lett. 36 (1976) 1316.
L.L. Kesmodel, L.H. Dubois and G.A. Somorjai, J. Chem. Phys. 70 (1979) 2180.
U. Starke, A. Barbieri, N. Materer, M.A. van Hove and G.A. Somorjai, Surf. Sci. 286 (1993) 1.
A. Wander, M.A. van Hove and G.A. Somorjai, Phys. Rev. Lett. 67 (1991) 626.
M.A. van Hove, R.J. Koestner, P.C. Stair, J.P. Bikerian, L.L. Kesmodel, I. Bartos and G.A. Somorjai, Surf. Sci. 103 (1981) 189.
Y. Ganthier, R. Baudoing-Savois, K. Heinz and H. Landskron, Surf. Sci. 251 (1991) 493.
J.H. Onuferko, D.P. Woodruff and P.W. Holland, Surf. Sci. 87 (1979) 357.
W. Oed, H. Lindner, U. Starke, K. Heinz, K. Muller and J.B. Pendry, Surf. Sci. 224 (1989) 179.
M.A. van Hove, W.M. Weinberg and C.M. Chan, Low Energy Electron Diffraction (Springer, Berlin, 1986).
H.D. Shih, F. Jona, P.W. Jepsen and P.M. Marcus, Phys. Rev. Lett. 46 (1981) 731.
C.M. Chan and M.A. van Hove, Surf. Sci. 183 (1987) 303.
B.J. McIntyre, M. Salmeron and G.A. Somorjai, J. Vac. Sci. Technol. A 266 (1992) 51.
Y.R. Shen, Surf. Sci. 299/300 (1994) 551.
Q. Du, R. Superfine, E. Freysz and Y.R. Shen, Phys. Rev. Lett. 70 (1993) 2313.
Y.R. Shen, Nature 337 (1989) 519.
Y.R. Shen, The Principles of Nonlinear Optics (Wiley, New York, 1984).
P. Guyot-Sionnest, J.H. Hunt and Y.R. Shen, Phys. Rev. Lett. 59 (1987) 1597.
C.D. Bain, J. Chem. Soc. Faraday Trans. 91 (1995) 1281.
P.S. Cremer, X. Su, Y.R. Shen and G.A. Somorjai, J. Am. Chem. Soc. 118 (1996) 2942.
I. Horiuti and M. Polanyi, Trans. Faraday Soc. 30 (1934) 1164.
A. Cassuto, J. Kiss and J. White, Surf. Sci. 255 (1991) 289.
H. Ibach and S. Lehwald, Surf. Sci. 117 (1982) 685.
P. Cremer, C. Stanners, J. Niemantsverdriet, Y. Shen and G. Somorjai, Surf. Sci. 328 (1993) 111.
T. Land, T. Michely, R. Behm, J. Hemminger and G. Comsa, J. Chem. Phys. 97 (1992) 6774.
S. Davis, F. Zaera, B. Gordon and G. Somorjai, J. Catal. 92 (1985) 250.
T. Beebe and J. Yates, J. Am. Chem. Soc. 108 (1986) 663.
S. Mohsin, M. Trenary and H. Robota, J. Phys. Chem. 92 (1988) 5229.
P.S. Cremer, X. Su, Y.R. Shen and G.A. Somorjai, J. Am. Chem. Soc. 118 (1996) 2942.
P.S. Cremer, X. Su, Y.R. Shen and G.A. Somorjai, J. Phys. Chem. 10040 (1996) 16302.
U. Starke, A. Barbieri, N. Materer, M.A. van Hove and G.A. Somorjai, Surf. Sci. 286 (1993) 1.
R. Döll, C.A. Gerken, M.A. van Hove and G.A. Somorjai, Surf. Sci. 374 (1997) 151.
McCrea, K.M., Parker and G.A. Somorjai, in preparation.
M.E. Bussell, F.C. Henn and C.T. Campbell, J. Phys. Chem. 96 (1992) 5965.
J.A. Rodriguez and C.T. Campbell, J. Phys. Chem. 93 (1989) 826.
C.L.A. Lamont, M. Borbach, R. Martin, P. Gardner, T.S. Jones, H. Conrad and A.M. Bradshaw, Surf. Sci. 374 (1997) 215.
D.P. Land, W. Erley and H. Ibach, Surf. Sci. 289 (1993) 773.
R. Martin, P. Gardner, M. Tushaus, C.H. Bonev, A.M. Bradshaw and T.S. Jones, J. Electron Spectrosc. Relat. Phenom. 54/55 (1990) 773.
X. Su, K. Kung, J. Lahtinen, Y.R. Shen and G.A. Somorjai, Catal. Lett. 54 (1998) 9.
X. Su, Y.R. Shen, K.Y. Kung, J. Lahtinen and G.A. Somorjai, J. Mol. Catal. A 141 (1999) 9.
G.M. Pajonk, S.J. Teichner and J.E. Germain, eds., Studies in Surface Science and Catalysis, Vol. 17 (Elsevier, Amsterdam, 1983).
W.C. Connor, G.M. Pajonk and S.J. Teichner, Adv. Catal. 34 (1986) 1.
J. Hager, Y.R. Shen and H. Walther, Phys. Rev. A 31 (1985) 1962.
W.D. Gillespie, R.K. Herz, E.E. Peterson and G.A. Somorjai, J. Catal. 70 (1981) 147.
G.A. Somorjai, in: The Physical Basis for Heterogeneous Catalysis, eds. E. Drauglis and R.I. Jaffee (Plenum, New York, 1976).
S.M. Davis and G.A. Somorjai, The Chemical Physics of Solid Surfaces and Heterogeneous Catalysis, Vol. 4., eds. P.A. King and D.P. Woodruff (Elsevier, 1982).
G.A. Somorjai, Introduction to Surface Chemistry and Catalysis (Wiley, New York, 1994).
J.A. Rodriguez and D.W. Goodman, Surf. Sci. Rep. 14 (1991) 1.
F.H. Ribeiro, A.L. Bonivardi, C. Kim and G.A. Somorjai, J. Catal. 150 (1994) 186.
C. Kim and G.A. Somorjai, Catalysis of Organic Reactions (Dekker, New York, 1994) pp. 511–514.
C. Kim and G.A. Somorjai, J. Catal. 134 (1992) 179.
F.H. Ribeiro, A.L. Bonivardi and G.A. Somorjai, Catal. Lett. 27 (1994) 1.
F.H. Ribeiro, A.L. Bonivardi, C. Kim and G.A. Somorjai, J. Catal. 150 (1994) 186.
M.X. Yang, D.H. Gracias, P.W. Jacobs and G.A. Somorjai, Langmuir 14 (1998) 1458.
M.X. Yang, P.W. Jacobs, C. Yoon, L. Muray, E. Anderson, D. Attwood and G.A. Somorjai, Catal. Lett. 45 (1998) 5.
A.C. Krauth, K.H. Lee, G.H. Bernstein and E.E. Wolf, Catal. Lett. 27 (1994) 43.
A. Avoyan, G. Rupprechter, A.S. Eppler and G.A. Somorjai, Topics Catal. 10 (2000) 107.
A.S. Eppler, G. Rupprechter, L. Guczi and G.A. Somorjai, J. Phys. Chem. 101 (1997) 9973.
K. Wong, S. Johansson and B. Kasemo, Faraday Discussions 105 (1996) 237.
G.A. Somorjai and M.X. Yang, J. Mol. Catal. A 115 (1997) 389.
A.S. Eppler, J. Zhu, E.A. Anderson and G.A. Somorjai, Topics Catal., to be published.
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Somorjai, G., McCrea, K. & Zhu, J. Active Sites in Heterogeneous Catalysis: Development of Molecular Concepts and Future Challenges. Topics in Catalysis 18, 157–166 (2002). https://doi.org/10.1023/A:1013874202404
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DOI: https://doi.org/10.1023/A:1013874202404