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Abstract

The diffuse reflectance/FT-IR spectrum of CO/Rh/Al₂O₃ system has been investigated in terms of pretreatment of the catalyst, Rh loading, CO pressure (coverage), and coadsorption of CO with oxygen. The widths of all bands were narrowed by Fourier self-deconvolution (FSD), and six types of CO/Rh adsorbed species, including two which have not been assigned previously, have been identified by their C-O stretching frequencies. Species I, assigned to Rh(I)(CO)₂, is formed with isolated Rh atoms and/or edge Rh atoms of atomic “rafts” and/or atomic crystallites. Species II is assigned to Rh(O)-CO. Species III' is assigned to [Rh(O)|₂CO. Species VI is assigned to [Rh(I)]₂CO. Two new species—IIIa, assigned to [Rh(O)]₃CO, with underlying Rh atom, and VI', assigned to [Rh(I))₂(CO)₃—are postulated.

Keywords

Infrared Reflectance spectroscopy Surface Analysis

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References

Ichikawa

, Bull. Chem. Soc. Jap. 51, 2273 (1978).

Castner

D. G.

Blackadar

R. L.

, and Somorjai

G. A.

, J. Catal. 66, 257 (1980).

Watson

P. R.

and Somorjai

G. A.

, J. Catal. 74, 282 (1982).

Yang

A. C.

and Garland

C. W.

, J. Phys. Chem. 61, 1504 (1957).

Yates

J. T.

Jr. Duncan

T. M.

Worley

S. D.

, and Vaughan

R. W.

, J. Chem. Phys. 70, 1219 (1979).

Worley

S. D.

Rice

C. A.

Mattson

G. A.

Curtis

C. W.

Guin

J. A.

, and Tarrer

A. R.

, J. Chem. Phys. 76, 20 (1982).

Dahl

L. F.

Martell

, and Wampler

D. L.

, J. Am. Chem. Soc. 83, 1761 (1961).

Kettle

S. F.

and Paul

, Adv. Organomet. Chem. 10, 199 (1972).

Dalton

Paul

, and Stone

F. G. A.

, J. Chem. Soc. A, 2774 (1969).

10.

Yates

J. T.

Jr. Duncan

T. M.

, and Vaughan

R. W.

, J. Chem. Phys. 70, 1225 (1979).

11.

Yates

J. T.

Jr. Duncan

T. M.

, and Vaughan

R. W.

, J. Chem. Phys. 71, 3908 (1979).

12.

Rice

C. A.

Worley

S. D.

Curtis

C. W.

Guin

J. A.

, and Tarrer

A. R.

, J. Chem. Phys. 74, 6487 (1981).

13.

Solymosi

and Erdohelyli

, J. Mol. Catal. 8, 471 (1980).

14.

Solymosi

Erdohelyli

, and Kocsis

, J. Catal. 65, 428 (1980).

15.

Yates

D. J. C.

Murrell

L. L.

, and Prestridge

E. B.

, J. Catal. 57, 41 (1979).

16.

Arai

and Tominaga

, J. Catal. 43, 131 (1976).

17.

Yao

H. C.

and Rothschild

W. G.

, J. Chem. Phys. 68, 4774 (1978).

18.

Primet

, J. Chem. Soc., Faraday Trans. 1, 74, 2570 (1978).

19.

Primet

and Garbowski

, Chem. Phys. Lett. 72, 472 (1980).

20.

Cavanagh

R. R.

and Yates

J. T.

Jr. , J. Chem. Phys. 74, 4150 (1981).

21.

Vis

J. C.

van't Blik

H. F. J.

Huizinga

van Grondelle

, and Prins

, J. Mol. Catal. 25, 367 (1984).

22.

van't Blik

H. F. J.

, Ph.D. Dissertation, Technische Hogeschool Eindhoven, The Netherlands (1984).

23.

van Zon

, Ph.D. Dissertation, Technische Hogeschool Eindhoven, The Netherlands (1984).

24.

Hamadeh

I. M.

King

, and Griffiths

P. R.

, J. Catal. 88, 264 (1984).

25.

Kauppinen

J. K.

Moffatt

D. J.

Mantsch

H. H.

, and Cameron

D. G.

, Appl. Spectrosc. 35, 271 (1981).

26.

Kauppinen

J. K.

Moffatt

D. J.

Mantsch

H. H.

, and Cameron

D. G.

, Anal. Chem. 53, 1454 (1981).

27.

Kauppinen

J. K.

Moffatt

D. J.

Cameron

D. G.

, and Mantsch

H. H.

, Appl. Opt. 20, 1866 (1981).

28.

Bradshaw

A. M.

and Hoffmann

F. M.

, Surf. Sci. 95, 131 (1980).

29.

Pfnur

Menzel

Hoffmann

F. M.

Ortiga

, and Bradshaw

A. M.

, Surf. Sci. 93, 431 (1980).

30.

Corssley

and King

, Surf. Sci. 95, 131 (1980).

31.

Wearie

, Surf. Sci. 103, L115 (1981).

32.

Woodruff

D. P.

Hayden

B. E.

Prince

, and Bradshaw

A. M.

, Surf. Sci. 123, 397 (1982).

33.

Conrad

Ertl

Koch

, and Latta

E. E.

, Surf. Sci. 43, 462 (1974).

34.

Hoffmann

F. M.

, Surf. Sci. Rep. 3, 107 (1983).

35.

Palazov

and Kadinov

, Comms. Departm. Chem., Bulg. Acad. Sci. VIII, 762 (1975).

36.

Blyholder

, Proc. Int. Cong. Catal., 3rd, Amsterdam 1, 657 (1965).

37.

Blyholder

, J. Phys. Chem. 68, 2772 (1964).

38.

Smith

A. K.

Hugues

Theolier

Basset

J. M.

Ugo

Zanderighi

G. M.

Bilhou

J. L.

Bilhou-Bougnol

, and Graydon

W. F.

, Inorg. Chem. 18, 3140 (1979).

Diffuse Reflectance FT-IR Studies of the Adsorption of CO on Rh/Al 2 O 3 Catalysts

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