Eka Nobel Ab

Katalistiks B.v.

Sven G Jaras

Marek T Tokarz

Rein Sikkar

Borje Persson

Bernt Larsson

Roland Pudas

Jan-Erik A Otterstedt

Bozena Tokarz

Lawrence L Upson

The present invention concerns a particulate agent for chemical and/or physical treatment of a fluid, such as a gas containing NO.sub.x and SO.sub.x, contains at least two particle types of different activity, the particle weight and/or particle size of each type lying within separate ranges. The agent may also contain catalyst particles for reducing NO.sub.x, and particles for absorbing SO.sub.x. The invention also concerns a method and a plant for treating a fluid with the inventive particulate agent.

Process for the removal of NO.sub.x SO.sub.x utilizing a particulate

The invention relates to a catalyst for the reduction of nitrogen oxides and comprises oxides of transition metals on a particulate carrier material, the catalyst comprising:

Catalyst for the reduction of nitrogen oxides, a method for its

The invention relates to a process for the preparation of an acid-resistant coating and calcium carbonate particles, in which process a slurry of calcium carbonate particles is mixed simultaneously with the solution of a zinc compound and a solution of a silica-containing substance at a temperature of 70.degree.-95.degree. C., the pH being maintained at 8-11. The invention also relates to calcium carbonate particles having an acid-resistant coating in accordance with the above-mentioned process. In addition, the invention relates to the use of calcium carbonate particles having a acid-resistant coating in accordance with the above-mentioned process, as an acid-resistant filler in the production of paper at pH 4.0-7.0.

Process for the preparation of an acid-resistant coating on filler

The invention relates to a composition for forming a heat-insulating ceramic coating on a metal, said composition comprising, in % by weight:

Ceramic coating on metal

A cracking catalyst having good resistance to metal poisoning has at least two particle fractions of different particle sizes, the cracking catalyzing zeolite material being concentrated to the coarser particle size fractions, and the finer particle size fractions being formed from material having relatively lower or no or insignificant cracking catalyzing activity. The particles of the finer particle size fractions have a matrix of kaolin and amorphous alumina-silica and may contain for example, an SO.sub.x eliminating additive such as Al.sub.2 O.sub.3, CaO and/or MgO. The coarser particle size fractions having cracking catalyzing effect have a mean particle size of from 80 to 125 .mu.m and the finer particle size fractions a mean particle size of from 30 to 75 .mu.m. The coarser particle size fractions have a zeolite content of at least 20 weight % and may have a zeolite content of up to 100 weight %, the remainder consisting essentially of material which has relatively lower or no or insignificant cracking-catalyzing activity and which consists of kaolin and amorphous alumina-silica. The catalyst mass as a whole may have a zeolite content of up to 50 weight %.

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Kungalv, Sweden

Sven G Jaras