Preparation of Pb-substituted hydroxyapatite catalyst and use in

Details Preparation of Pb-substituted hydroxyapatite catalyst and use in Preparation of Pb-substituted hydroxyapatite catalyst and use in

1997-05-23

1999-03-02

Yildirim, Bekir L.

Chemistry of hydrocarbon compounds

Special chemical considerations

Synthesis from methane or inorganic carbon source, e.g.,...

585654, 585658, 585502, 585700, 502439, 502208, C07C 284

Patent

active

058773878

ABSTRACT:
A preparation of a Pb-substituted hydroxyapatite catalyst for oxidative coupling of methane represented by the formula Ca.sub.10-x pb.sub.x (PO.sub.4).sub.6 (OH).sub.2 wherein 0<X<10 or preferably 0<X<3, includes have over 0.01M concentration and pH 9 and maintaining a resultant precipitate for 5 to 20 hours for aging and then calcining the resultant. A method for producing C.sub.2 compounds using the thusly produced catalyst includes reacting a mixed gas composed of methane, oxygen and helium in the presence of 5.about.20 g.multidot.min/L of the Pb-substituted hydroxyapatite catalyst according to the present invention, at a high temperature of at least 600.degree. C.

REFERENCES:
Matsumura et al., "Selective oxidative coupling of methane catalyzed over hydroxyapatite ion-exchanged with lead", J. of Chem. Soc., Faraday Trans., 90 (14), 1994.
G.E. Keller and M.M. Bhasin, "Synthesis of Ethylene via Oxidative Coupling of Methane", Journal of Catalysis, 73, 9-19 (1982).
B. Hinsen, W. Bytyn and M. Baerns, "Oxidative Dehydrogenation and Coupling of Methane", Proc. 8th ICC, 3, 581-591 (1984).
J.A.S.P. Carreiro and M. Baerns, "Catalytic Conversion of Methane by Oxidative Coupling to D.sub.2+ Hydrocarbons", React. Kinet. Catal. Lett., vol. 35, Nos. 1-2, 349-360 (1987).
J.P. Bartek, J.M. Hupp, J.F. Brazdil and R.K. Grasselli, "Oxidative Dimerization of Methane over Lead-Magnesium Mixed Oxide Catalysts", Catalysis Today, 3, 117-126 (1988).
J.A. Roos, A.G. Bakker, H. Bosch, J.G. van Ommen and J.R.H. Ross, "Selective Oxidation of Methane to Ethane and Ethylene over Various Oxide Catalysts", Catalysis Today, 1, 133-145 (1987).
Yasuyuki Matsumura and John B. Moffat, "Catalytic Oxidative Coupling of Methane over Hydroxyapatite Modified with Lead", Catalysis Letters, 17, 197-204 (1993).
Kimihiro Yamashita, Hitoshi Owada, Hiroshi Nakagawa, Takao Umegaki and Takahumi Kanazawa, "Trivalent-Cation-Substituted Calcium

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