Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Reexamination Certificate
2005-05-10
2005-05-10
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
C502S328000
Reexamination Certificate
active
06890499
ABSTRACT:
Catalyst for decomposing N2O, its use, and process for its productionA process is described for the decomposition of N2O during nitric acid production by bringing the N2O-containg waste gas leaving the absorption column into contact with a catalyst which comprises at least one oxidic cobalt compound and at least one oxidic magnesium compound, under conditions which permit conversion of N2O to gaseous nitrogen and oxygen. The content of oxidic cobalt compounds is in the range from 0.1 to 50% by weight and the content of oxidic magnesium compounds is in the range from 50 to 99.9% by weight, based in each case on the total weight of the catalyst, and at least 30% of the Co atoms present in the catalyst are present in the trivalent state.The preparation of the catalyst involves dry mixing of the oxidic cobalt compounds and the oxidic magnesium compounds or of appropriate precursors which are converted into the oxidic compounds by heat treatment, and compacting the mix, with exclusion of water, so that the resultant catalyst has the desired envelope density.
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English language abstract of DE 19700490 (Derwent—1998).
English language abstract of WO200013789 (Derwent—2000).
Connolly Bove & Lodge & Hutz LLP
Silverman Stanley S.
Strickland Jonas N.
Uhde GmbH
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