Abstract
The structural properties of Pd/silica catalysts have been investigated by means of DTA and X-ray techniques. The X-ray results indicate that Pd metal is the only phase formed. The textural properties were determined using low-temperature nitrogen adsorption. Surface areas were calculated and the dependence of the surface area on the metal content has been discussed. Pore structure analyses indicate the presence of both micro-and meso-pores. The dehydrogenation of cyclohexane was found to be affected by the metal content. The active site for the dehydrogenation process on Pd/silica catalysts consists of one Pd atom. The kinetics of the dehydrogenation exhibit a fractional order.
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References
1.
Alfred
E.H.
(1966 ) Am. Chem. Soc., Div. Petrol. Chem . 11 , 87 .
2.
Baker
R.T.K.
,
Prestridge
E.B.
and
Garten
R.L.
(1979 ) J. Catal . 56 , 390 .
3.
Bekauri
N.G.
,
Kandelaki
A.S.
and
Chichindadze
N.N.
(1970 ) J. Geruz. Politeckh. Inst . 5 , 34 .
4.
Brunauer
S.
,
Emmett
P.H.
and
Teller
E.
(1938 ) J. Am. Chem. Soc . 60 , 309 .
5.
Brunauer
S.
,
Mikhail
R.Sh.
and
Bodor
E.E.
(1967 ) J. Colloid Interface Sci . 24 , 451 .
6.
Chang
T.C.
,
Chen
J.J.
and
Yeh
C.T.
(1985 ) J. Catal . 96 , 51 .
7.
Ciapetta
F.G.
,
Dobres
R.H.
and
Baker
R.W.
(1958 ) Catalytic Reforming of Hydrocarbons and Petroleum Naphthenes Reinhold, New York, Vol. 6 , p. 495 .
8.
Cosyns
J.
,
Chenebaux
M.T.
,
Le Page
J.F.
and
Montamal
R.
(1976 ) Preparation of Catalysts
Delmon
B.
,
Jacobs
P.A.
,
Poncelet
G.
, Eds, Elsevier , Amsterdam .
9.
Davis
J.L.
and
Barteau
M.A.
(1990 ) Surf. Sci . 235 , 235 .
10.
de Boer
J.H.
(1958 ) The Structure and Properties of Porous Materials Butterworths, London, p. 68 .
11.
de Boer
J.H.
(1970 ) Physical and Chemical Aspects of Adsorbants and Catalysts Academic Press, London, p. 23 .
12.
Desai
P.H.
and
Richardsen
J.T.
(1986 ) J. Catal . 98 , 392 .
13.
El-Hakam
S.A.
,
Hassan
S.M.
,
Ahmed
A.I.
and
Farag
H.M.
(1993 ) Afinidad 444 , 85 .
14.
Fort
E.
Jr.
and
Nebesh
E.
(1968 ) J. Catal . 11 , 59 .
15.
Fuentes
S.
and
Figureas
F.
(1980 ) J. Catal . 61 , 235 .
16.
Gland
J.L.
,
Baron
K.
and
Somorjai
G.A.
(1975 ) J. Catal . 36 , 305 .
17.
Haensel
V.
(1949 ) US. Pat. 2 479 109 .
18.
Hassan
S.M.
,
Ahmed
A.I.
and
El-Hakam
S.A.
(1991 ) Indian J. Chem . 30A , 75 .
19.
Houalla
M.
(1983 ) Stud. Surf Sci. Catal . 16 , 273 .
20.
Juszczyk
W.
and
Karpinski
Z.
(1989 ) J. Catal . 117 , 519 .
21.
Kiperman
S.L.
(1964 ) Introduction to the Kinetics of Heterogeneous Catalysis Izd. Nauka, Moscow, p. 543 .
22.
Kobozev
N.I.
(1946 ) Acta Physiochim. USSR 21 , 294 .
23.
Kodes
R.J.
,
Tobin
H.
and
Emmett
P.H.
(1955 ) J. Am. Chem. Soc . 77 , 5860 .
24.
Kordulis
C.
,
Lycourghiotis
A.
,
Voliotis
S.
and
Pomonis
P.
(1985 ) Appl. Catal . 15 , 301 .
25.
Mikhail
R.Sh
.,
Brunauer
S.
and
Bodor
E.E.
(1968 ) J. Colloid Interface Sci . 26 , 45 .
26.
Mitrofanova
A.N.
,
Boronin
V.S.
and
Poltorak
O.M.
(1966 ) Vestn. Mosk. Univ. Khim . 21 , 40 .
27.
Rasko
J.
,
Bontovics
J.
and
Solymosi
F.
(1994 ) J. Catal . 146 , 22 .
28.
Ross
R.A.
and
Valentine
J.H.
(1963 ) J. Catal . 2 , 29 .
29.
Sinfelt
J.H.
,
Hurwitz
J.
and
Shulman
R.A.
(1960 ) J. Chem. Phys . 64 , 1559 .
30.
Sing
K.S.W.
,
Everett
D.H.
,
Haul
R.A.W.
,
Moscou
L.
,
Pierotti
R.A.
,
Rouquerol
J.
and
Siemienewska
T.
(1985 ) Pure Appl. Chem . 57 , 603 .
31.
Smith
J.V.
(Ed) (1961 ) X-Ray Powder Data File and Index to X-Ray Data File ASTM, Philadelphia, PA.
32.
Taylor
W.F.
,
Sinfelt
J.H.
and
Yates
D.J.C.
(1965 ) J. Phys. Chem . 69 , 3857 .
33.
Taylor
W.F.
,
Yates
D.J.C.
and
Sinfelt
J.H.
(1964 ) J. Phys. Chem . 68 , 2962 .
34.
Wendt
G.
,
Siegel
H.
and
Schmitz
W.
(1980 ) Cryst. Res. Technol . 17 , 1435 .
35.
Youssef
A.M.
,
Hassan
S.M.
and
Ahmed
A.I.
(1984 ) Egypt. J. Chem . 27 , 219 .
36.
Zoltan
P.
and
Tetenyi
P.
(1967 ) Kan Kozlem 28 , 13 .