Joseph M Lewandowski

US Patent:

42038715, May 20, 1980

Filed:

Nov 1, 1978

Appl. No.:

5/956744

Inventors:

Harold S. Horowitz - Clark NJ
John M. Longo - New Providence NJ
Joseph T. Lewandowski - Middlesex NJ

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

H01B 108

US Classification:

252518

Abstract:

A liquid solution method of preparing electrically conductive pyrochlore compounds having the formula: A. sub. 2 [B. sub. 2-x A. sub. x ]O. sub. 7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, 0. ltoreq. times. ltoreq. 1. 0 and 0. ltoreq. y. ltoreq. 1. The method involves reacting A and B cations to yield a pyrochlore oxide by precipitation of A and B cations in a liquid medium having a pH which is equal to or greater than 4. 5, but less than 13. 5, in the presence of an oxygen source at a temperature below about 200. degree. C. for a time sufficient for reaction to occur. In those instances in which amorphous reaction products are obtained, these amorphous reaction products are subsequently heat treated at a temperature of about 200. degree. C. to about 600. degree. C. for a time sufficient to convert amorphous reaction products to crystalline pyrochlore(s).

US Patent:

44406703, Apr 3, 1984

Filed:

Sep 30, 1982

Appl. No.:

6/430237

Inventors:

Harold S. Horowitz - Edison NJ
Joseph T. Lewandowski - Middlesex NJ

Assignee:

Exxon Research and Engineering Co. - Florham Park NJ

International Classification:

C01G 5500
H01B 108

US Classification:

252518

Abstract:

A method of preparing electrically conductive pyrochlore compounds of high surface area and unagglomerated form, having the formula A. sub. 2 [B. sub. 2-x A. sub. x ]O. sub. 7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, 0

US Patent:

45930139, Jun 3, 1986

Filed:

Mar 26, 1985

Appl. No.:

6/716040

Inventors:

Allan J. Jacobson - Princeton NJ
Jack W. Johnson - Clinton NJ
Joseph T. Lewandowski - Whitehouse Station NJ

Assignee:

Exxon Research and Engineering Co. - Florham Park NJ

International Classification:

B01J 3102

US Classification:

502167

Abstract:

Disclosed are a class of compositions, and methods of preparing them, which compositions are comprised of inorganic oxides and organic bases. The compositions have layered structures and are represented by the formula Z. sub. a H. sub. b M. sub. c [A. sub. n-1 B. sub. n O. sub. 3n+1 ] where Z is an organic base having a conjugate acid with a pKa value greater than about 3, H is hydrogen, M is a monovalent cation, O

US Patent:

41295250, Dec 12, 1978

Filed:

Dec 2, 1977

Appl. No.:

5/856648

Inventors:

Harold S. Horowitz - Clark NJ
John M. Longo - New Providence NJ
Joseph T. Lewandowski - Middlesex NJ

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

C01G 5500

US Classification:

252518

Abstract:

A liquid solution method of preparing electrically conductive pyrochlore compounds of high surface area, having the formula: A. sub. 2 [B. sub. 2-x A. sub. x ]0. sub. 7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, 0 < x. ltoreq. 1. 0 and 0. ltoreq. y. ltoreq. 1. The method involves reacting A and B cations to yield a pyrochlore oxide by precipitation of A and B cations from an aqueous solution source of these cations in a liquid alkaline medium having a pH of at least about 13. 5 in the presence of an oxygen source at a temperature below about 200. degree. C for a sufficient time for reaction to occur.

US Patent:

50154613, May 14, 1991

Filed:

Jun 26, 1989

Appl. No.:

7/343752

Inventors:

Allan J. Jacobson - Princeton NJ
Richard B. Hall - Warren NJ
Charles A. Mims - Summit NJ
Joseph T. Lewandowski - Whitehouse Station NJ

Assignee:

Exxon Research & Engineering Company - Florham Park NJ

International Classification:

C01G 3300
C01G 3500

US Classification:

423593

Abstract:

Processes for the conversion of hydrocarbons, and most preferably methane, to higher hydrocarbons and olefins are disclosed, including contacting the hydrocarbons with a mixed metal oxide catalyst having the pyrochlore structure. Preferably, these catalysts have the general formula A. sub. n B. sub. 2 O. sub. 7 -x, where A can be various mono-, di-, and trivalent metal cations, B can be various tri-, tetra-, penta-, and hexavalent metal cations, 0. ltoreq. n. ltoreq. 2. 0, and 0. ltoreq. x. ltoreq. 1. Novel, high surface area, mixed metal oxide cataysts having the pyrochlore structure are also disclosed, including those having the formula A. sub. 2 B. sub. 2 O. sub. 7, where A is divalent and B is niobium and/or tantalum, and those having the formula A. sub. 2 (Sn. sub. 2-y A. sub. y)O. sub. 7-z, where A is bismuth and/or lead, 0. ltoreq. y. ltoreq. 1. 0, and 0. ltoreq. z. ltoreq. 1.

US Patent:

51050536, Apr 14, 1992

Filed:

Jan 2, 1991

Appl. No.:

7/636820

Inventors:

Allan J. Jacobson - Princeton NJ
Richard B. Hall - Warren NJ
Charles A. Mims - Summit NJ
Joseph T. Lewandowski - Whitehouse Station NJ

Assignee:

Exxon Research and Engineering Company - Florham Park NJ

International Classification:

C07C 200

US Classification:

585658

Abstract:

Processes for the conversion of hydrocarbons, and most preferably methane, to higher hydrocarbons and olefins are disclosed, including contacting the hydrocarbons with a mixed metal oxide catalyst having the pyrochlore structure. Preferably, these catalysts have the general formula A. sub. n B. sub. 2 O. sub. 7-x, where A can be various mono-, di-, and trivalent metal cations, B can be various tri-, tetra-, penta-, and hexavalent metal cations, 0. ltoreq. n. ltoreq. 2. 0, and 0. ltoreq. x. ltoreq. 1. Novel, high surface area, mixed metal oxide catalysts having the pyrochlore structure are also disclosed, including those having the formula A. sub. 2 B. sub. 2 O. sub. 7, where A is divalent and B is niobium and/or tantalum, and those having the formula A. sub. 2 (Sn. sub. 2-y A. sub. y)O. sub. 7-z, where A is bismuth and/or lead, 0. ltoreq. y. ltoreq. 1. 0, and 0. ltoreq. z. ltoreq. 1.

US Patent:

41927800, Mar 11, 1980

Filed:

Nov 1, 1978

Appl. No.:

5/956743

Inventors:

Harold S. Horowitz - Clark NJ
John M. Longo - New Providence NJ
Joseph T. Lewandowski - Middlesex NJ

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

H01B 108

US Classification:

252518

Abstract:

A liquid solution method of preparing electrically conductive pyrochlore compounds of high surface area, having the formula: A. sub. 2 [B. sub. 2-x A. sub. x ]O. sub. 7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, 0

US Patent:

42254698, Sep 30, 1980

Filed:

Nov 1, 1978

Appl. No.:

5/956745

Inventors:

Harold S. Horowitz - Clark NJ
John M. Longo - New Providence NJ
Joseph T. Lewandowski - Middlesex NJ

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

H01B 106

US Classification:

252518

Abstract:

A method of preparing electrically conductive pyrochlore compounds having the formula: A. sub. 2 [B. sub. 2-x A. sub. x ]0. sub. 7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, O. ltoreq. x. ltoreq. 1. 0 and 0. ltoreq. y. ltoreq. 1. The method involves reacting A and B cations using at least one solid reactant source of these cations in a liquid alkaline medium having a pH of at least about 13. 5 in the presence of an oxygen source at a temperature below about 200. degree. C. for a sufficient time for reaction to occur.