US 5,877,387 A · Preparation of Pb-substituted hydroxyapatite catalyst and use in oxidative coupling of methane

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 dissolving calcium nitrate tetrahydrate Ca(NO.sub.3).sub.2 4H.sub.2 O!, lead nitrate Pb(NO.sub.3).sub.2 ! and monobasic ammonium phosphate NH.sub.4 H.sub.2 PO.sub.4 ! in a distilled water at room temperature to 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.

Claims10

Dependent claims

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, comprising;

dissolving calcium nitrate tetrahydrate Ca(NO.sub.3).sub.2 4H.sub.2 O!, lead nitrate Pb(NO.sub.3).sub.2 ! and monobasic ammonium phosphate NH.sub.4 H.sub.2 PO.sub.4 ! in distilled water at room temperature to have a concentration of at least 0.01M and pH 9;
and
maintaining a resultant precipitate for 5 to 20 hours as such in the solution and then calcining the resultant.

Dependencies are inferred from the claim text.

Facts

Application

08/862,891Filed 23 May 1997

Priority

KR 1996-6459312 Dec 1996

Granted

2 Mar 1999

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C07C 2/84
Oxidative coupling: catalytic
B01J 27/1806
Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates: with…
B01J 27/1815
Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates: with…
C07C 2523/02
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00: of the alkali- or alkaline earth metals or beryllium

Preparation of Pb-substituted hydroxyapatite catalyst and use in oxidative coupling of methane

Life of this patent

Preparation of Pb-substituted hydroxyapatite catalyst and use in oxidative coupling of methane

Life of this patent

Abstract

Claims10