Solvay Sa

Antonella Gervasini

Thierry Delplanche

A porous material comprises at least 60 wt % of a calcium-deficient hydroxyapatite having a Ca/P molar ratio of less than 1.67, having a specific BET surface area of at least 110 m/g and a pore volume of at least 0.41 cm/g, both measured after heat treatment at 120&#xb0; C. A catalyst composition for catalytic reduction of NOcompounds, comprising an active catalyst component: Cu and/or CuO deposited on the porous material as support. A deNOx process according to which an ammonia source is injected into a combustion waste gas stream containing NOx; and to which the catalyst composition is brought into contact with the waste gas stream at a temperature of at least 100&#xb0; C. and preferably at most 600&#xb0; C. to carry out, in the presence of O, a reduction by NHof at least a portion of the NOx.

Copper supported catalyst comprising a Ca-deficient hydroxyapatite for waste gas NOx removal

Process for treating a combustion waste gas stream containing NOx and contaminants such as heavy metals and/or acid gases, e.g., halogens, SOx, comprising: injecting an alkali sorbent, into the waste gas stream; removing some contaminants with the alkali sorbent from the waste gas stream; injecting an ammonia source into the gas stream; injecting a deNOx catalyst into the gas stream at a temperature of 100&#xb0; C. to preferably not more than 600&#xb0; C. to reduce with NH3, in the presence of O, some NOx to Nand water in the gas stream, wherein the deNOx catalyst comprises copper and/or copper oxide deposited on a porous support comprising at least 60 wt % of a calcium-deficient hydroxyapatite having a Ca/P of less than 1.67. A blend comprising the alkali sorbent and the deNOx catalyst may be formed to inject them together into the waste gas stream. The ammonia source and the deNOx catalyst are preferably injected simultaneously. Alternatively, the ammonia source may be included in the alkali sorbent and/or the deNOx catalyst.

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Milan, Italy

Antonella Gervasini