Shell Oil Comapny

Shell Usa, Inc.

Wenzhong Zhang

Andreas Klemt

Guido Seng

Paul Benjerman Himelfarb

Wassim Klink

Geert Marten Bakker

Steven Russell Lee

A reactor for reducing the concentration of NOin a stream comprising: an inlet for the stream; an outlet for a stream containing a reduced concentration of NO; one or more catalyst beds comprising a ceramic or metallic foam with a NOreduction catalyst; one or more flow paths from the inlet to the outlet that passes through at least one catalyst bed wherein the catalyst beds are closed at the top and bottom so that the flow path through the catalyst bed passes through the sides of the catalyst bed in a lateral flow is described.

Reactor for reducing nitrogen oxides

A method for regenerating a deNOcatalyst includes contacting the catalyst with steam at a temperature in the range of from 250 to 390&#xb0; C. The method also includes reducing the amount of nitrogen oxide components in a process gas stream that includes a) contacting the process gas with a deNOcatalyst which results in the conversion of nitrogen oxide components as well as a decline in the NOconversion over the deNOcatalyst; and b) regenerating the deNOcatalyst to improve the NOconversion by contacting the deNOcatalyst with steam at a temperature in the range of from 250 to 390&#xb0; C.

Method of regenerating a deNOcatalyst

A catalyst for the conversion of NOand NO comprising iron chabazite and iron beta zeolite. A method of simultaneously reducing the NOand NO concentration in a process gas stream comprising contacting the process gas stream with a catalyst comprising iron chabazite and iron beta zeolite under conversion conditions.

Catalyst and method of use thereof in conversion of NOand NO

A reactor for reducing the concentration of NOx in a stream comprising: an inlet for the stream; an outlet for a stream containing a reduced concentration of NOx; one or more catalyst beds comprising a ceramic or metallic foam with a NOx reduction catalyst; one or more flow paths from the inlet to the outlet that passes through at least one catalyst bed wherein the catalyst beds are closed at the top and bottom so that the flow path through the catalyst bed passes through the sides of the catalyst bed in a lateral flow is described.

A catalyst bed comprising a ceramic or metallic foam comprising one or more NOreduction catalysts is described. A method for reducing the concentration of NOin a dust containing gas stream comprising: a) passing a first gas stream containing NOinto a contacting zone; b) contacting the first gas stream with a ceramic or metallic foam catalyst bed having one or more flow paths through the catalyst bed wherein the ceramic or metallic foam comprises a NOreduction catalyst to produce a second gas stream with a reduced NOconcentration; and c) passing the second gas stream out of the contacting zone wherein the first gas stream has a dust concentration of at least 5 mg/Nmand the pressure drop of the foam catalyst bed increases by 300% or less relative to the initial pressure drop of the foam catalyst bed due to dust accumulation, measured under the same conditions is also described.

Catalyst bed and method for reducing nitrogen oxides

A catalyst bed comprising a ceramic or metallic foam comprising one or more NOx reduction catalysts is described. Further, a method for reducing the concentration of NOx in a dust containing gas stream comprising: a) passing a first gas stream containing NOx into a contacting zone; b) contacting the first gas stream with a ceramic or metallic foam catalyst bed having one or more flow paths through the catalyst bed wherein the ceramic or metallic foam comprises a NOx reduction catalyst to produce a second gas stream with a reduced NOx concentration; and c) passing the second gas stream out of the contacting zone wherein the first gas stream has a dust concentration of at least 5 mg/Nm3 and the second gas stream comprises at least 50% of the amount of dust in the first gas stream.

The invention provides a method of reducing the amount of nitrogen oxide components in a process gas stream comprising: a) contacting a deNOcatalyst with the process gas in the presence of ammonia which results in the conversion of nitrogen oxide components as well as a decline in the NOconversion over the deNOcatalyst; and b) regenerating the deNOcatalyst to improve the NOconversion by contacting the deNOcatalyst at a temperature in the range of from 250 to 390&#xb0; C. with a flow of ammonia that is reduced relative to the flow of ammonia in step a) and process gas, air or a mixture thereof.

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Houston, TX, United States of America

Wenzhong Zhang