Abstract: A process for reducing the nitrogen oxide content in waste gases of combustion installations is disclosed. The present process is a catalytic reduction with ammonia wherein the nitrogen oxide-containing waste gases are conducted past temperature-resistant structures which are coated with a mixture of one or more aluminosiliciates of the faujasite group, silica sol and/or silicates and a copper compound.

Abstract: A lacquer comprising an organic binder, at least one pigment or filler, and a zeolite in an amount sufficient to increase the dispersibility of the pigment or filler. Advantageously the pigment is at least one of titanium dioxide, iron oxide and mixed-phase rutile, and the binder is a polyester. Desirably the pigment is present in from about 1 to 5% by volume of the pigment plus any filler and its average particle size is from about 1 to 3 .mu.m.

Abstract: A type A zeolite corresponding to the formulax Me.sup.II O .multidot. n ME.sup.I.sub.2 O .multidot. Al.sub.2 O.sub.3 .multidot. (1.85 .+-. 0.5) SiO.sub.2 in whichMe.sup.I is a monovalent metal;Me.sup.II is a divalent metal;x has a value of at least 0.80; and n has a value of (1.0 .+-. 0.2) - xIs produced by treating a type Na-A zeolite with a solution of a divalent metal salt to replace sodium and introduce x moles of the divalent metal. This introduces far more divalent metal than is needed for adsorption but the resulting zeolite does not undergo the loss in adsorptive capacity upon regeneration in the presence of water vapor which is exhibited by those of a lower degree of exchange. The new zeolites are particularly suitable for treatment of a mixture of substances comprising a polar or polarizable substances and less polar or less polarizable substances, a mixture of nitrogen and oxygen and a mixture of CO.sub.2 with other gases.