Process and catalyst/sorber for treating sulfur compound...

Details Process and catalyst/sorber for treating sulfur compound... Process and catalyst/sorber for treating sulfur compound...

B - Operations, Transporting

01

J

B01J 23/54 (2006.01) B01D 53/48 (2006.01) B01J 23/38 (2006.01) B01J 23/96 (2006.01)

Patent

CA 2336855

A process and composition are provided for removing contaminants, such as sulfur dioxide and hydrogen sulfide, out of exhaust gases by contacting the contaminated exhaust gas with a catalyst/sorber composition comprising noble metal components and a sorber component, such as oxides of Ti, Zr, Hf, Ce, Al, Si and mixtures thereof, so as to remove the contaminants out of the exhaust gas. The contaminant-loaded catalyst/sorber composition is regenerated via contact with a mixture of an inert gas, such as nitrogen, and a reducing gas, such as hydrocarbons. The catalyst/sorber composition may also contain a modifier, such as Cu, Ag or Bi, which tends to promote the release of the sulfur contaminant off the contaminant-loaded catalyst/sorber composition as sulfur dioxide, rather than the hydrogen sulfide. The catalyst/sorber composition also promotes the oxidation of carbon monoxide in the exhaust gas.

Cette invention a trait à un procédé ainsi qu'à la composition utilisée dans le cadre de celui-ci visant à extraire des contaminants, notamment du dioxyde de soufre et de l'hydrogène sulfuré, de gaz d'échappement et ce, par mise en contact du gaz d'échappement contaminé avec un catalyseur et/ou une composition sorbante comprenant des composants métalliques nobles et un agent sorbant, notamment des oxydes de Ti, de Zr, de Ce, d'Al, de Si et leurs mélanges et ce, afin d'extraire les contaminants de ce gaz d'échappement. Le catalyseur et/ou la composition sorbante chargés de contaminants sont régénérés par mise en contact avec un gaz inerte, de l'azote par exemple, ainsi qu'avec un gaz réducteur, des hydrocarbures par exemple. Le catalyseur et/ou la composition sorbante peuvent également renfermer un agent de modification, notamment du Cu, de l'Ag ou du Bi ayant tendance à favoriser le départ du contaminant soufré du catalyseur et/ou de la composition sorbante chargés de contaminants sous forme de dioxyde de soufre plutôt que d'hydrogène sulfuré. Ce catalyseur et/ou cette composition sorbante favorisent, de surcroît, l'oxydation du monoxyde de carbone dans le gaz d'échappement.

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