The University of Chicago

The United States of America As Represented by the Department of Energy

Argonne National Laboratory

Arun C Bose

Uthamalingam Balachandran

Stephen E Dorris

Howard G McIlvried

Gary J Stiegel

Tae-Hyun Lee

Uthamalinga Balachandran

An apparatus and method for decomposing NH . A fluid containing NH is passed in contact with a tubular membrane that is a homogeneous mixture of a ceramic and a first metal, with the ceramic being selected from one or more of a cerate having the formula of M&prime;Ce M&Prime; , zirconates having the formula M&prime;Zr M&Prime;O , stannates having the formula M&prime;Sn M&prime;O , where M&prime; is a group IIA metal, M&Prime; is a dopant metal of one or more of Ca, Y, Yb, In, Nd, Gd or mixtures thereof and &dgr; is a variable depending on the concentration of dopant and is in the range of from 0.001 to 0.5, the first metal is a group VIII or group IB element selected from the group consisting of Pt, Ag, Pd, Fe, Co, Cr, Mn, V, Ni, Au, Cu, Rh, Ru and mixtures thereof. The tubular membrane has a catalytic metal on the side thereof in contact with the fluid containing NH which is effective to cause NH to decompose to N and H . When the H contacts the membrane H ions are formed which pass through the membrane driving the NH decomposition toward completion.

Method to remove ammonia using a proton-conducting ceramic membrane

A method for producing hydrogen includes providing a feed stream comprising water; contacting at least one proton conducting membrane adapted to interact with the feed stream; splitting the water into hydrogen and oxygen at a predetermined temperature; and separating the hydrogen from the oxygen. Preferably the proton conducting membrane comprises a proton conductor and a second phase material. Preferable proton conductors suitable for use in a proton conducting membrane include a lanthanide element, a Group VIA element and a Group IA or Group IIA element such as barium, strontium, or combinations of these elements. More preferred proton conductors include yttrium. Preferable second phase materials include platinum, palladium, nickel, cobalt, chromium, manganese, vanadium, silver, gold, copper, rhodium, ruthenium, niobium, zirconium, tantalum, and combinations of these. More preferably second phase materials suitable for use in a proton conducting membrane include nickel, palladium, and combinations of these. The method for generating hydrogen is preferably preformed in the range between about 600&deg; C. and 1,700&deg; C.

Method of generating hydrogen by catalytic decomposition of water

A method of combusting pulverized coal by mixing the pulverized coal and an oxidant gas to provide a pulverized coal-oxidant gas mixture and contacting the pulverized coal-oxidant gas mixture with a flame sufficiently hot to combust the mixture. An oxygen-containing gas is passed in contact with a dense ceramic membrane of metal oxide material having electron conductivity and oxygen ion conductivity that is gas-impervious until the oxygen concentration on one side of the membrane is not less than about 30% by volume. An oxidant gas with an oxygen concentration of not less than about 30% by volume and a CO,concentration of not less than about 30% by volume and pulverized coal is contacted with a flame sufficiently hot to combust the mixture to produce heat and a flue gas. One dense ceramic membrane disclosed is selected from the group consisting of materials having formulae SrCo,Fe,O,, SrCo,FeO,and La,Sr,Co,Fe,O,.

Carbon dioxide remediation via oxygen-enriched combustion using dense ceramic membranes

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Pittsburgh, PA, United States of America

Arun C Bose