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Abstract

A series of catalysts containing 1 wt.% Pd supported on various oxides of commercial origin have been characterised by hydrogen adsorption at 298 K and evaluated for vapour-phase phenol hydrogenation at 473 K employing an H/phenol ratio of 5.4 at atmospheric pressure. The activity of phenol hydrogenation showed a dependence on the irreversible uptake of hydrogen. Among the catalysts studied, Pd/Al₂O₃ showed a decrease in activity with increasing temperature while Pd/MgO passed through a maximum at 503 K. The Pd/MgO catalysts exhibited a higher dispersion of smaller Pd crystallites leading to higher activity and total selectivity for cyclohexanone. The higher resistance towards deactivation and better stability of the Pd/MgO catalysts suggest that the acidic sites of alumina may be responsible for deactivation, thereby accounting for the lowering of activity with Pd/Al₂O₃ catalysts.

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References

Aben

P.C.

(1968) J. Catal. 10, 224.

Anderson

J.R.

(1975) Structure of Metallic Catalysts, Academic Press, London, p. 296.

Benson

J.E.

, Wang

H.S.

and Boudait

(1973) J. Catal. 30, 146.

Bond

G.C.

(1987) Heterogeneous Catalysis — Principles and Applications, Clarendon Press, Oxford, p. 136.

Chen

and Schmidt

L.D.

(1979) J. Catal. 56, 198.

Gonzalez-Velasco

J.R.

, Gutierrez-Ortiz

J.I.

and Romero-Salvadov

(1982) Afinidad 39, 543.

Lam

Y.L.

and Boudart

(1977) J. Catal. 47, 393.

Levin

M.F.

, Salmeron

, Bell

A.T.

and Somorjai

G.A.

(1988) J. Chem. Soc., Faraday Trans. 1 83, 2061.

Nagendranath

Mahata

and Vishwanathan

(1996) Unpublished results.

10.

Narayanan

and Sreekanth

(1989) J. Chem. Soc., Faraday Trans. 1 85, 3785.

11.

Neri

, Visco

A.M.

, Donato

, Milone

, Malentacchi

and Gubitosa

(1994) Appl. Catal. 110, 49.

12.

Rylander

P.N.

(1974) Catalytic Hydrogenation in Organic Synthesis Academic Press, New York, p. 194.

13.

Scholten

J.J.F.

and Van Montfort

(1962) J. Catal. 1, 85.

14.

Srinivas

S.T.

, Jhansi

Lakshmi, L.

and Kanta Rao

(1994) Appl. Catal. 110, 167.

15.

Talukdar

A.K.

, Bhattacharya

K.G.

and Sivasankar

(1993) Appl. Catal. 96, 229.

16.

Vishwanathan

, Sajjad

S.M.

and Narayanan

(1991) Indian J. Chem. 30A, 679.

17.

Yao

H.C.

and Yao

Y.F.

(1984) J. Catal. 86, 254.

Dependency of Phenol Hydrogenation Activity on Hydrogen Chemisorption over Supported Palladium Catalysts

Abstract

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