A process for the preparation of nano-oxide coated catalysts useful for the treatment of toxic gases by coating of composite materials containing LDHs over ceramic monolithic substrates. The process combines reacting oxides and salts of metals so as to prepare LDHs or mixed metal layered hydroxides possessing positive layer charge, from which a stable gel is prepared by adding swellable clay having a negative charge in different LDH:clay ratio in an aqueous medium and homogenizing the same in a high intensity ultrasonic processor. The gel is then dip-coated over cordierite/mulite honey-comb monolithic supports at various dipping and withdrawal rates. The dip-coated monoliths are then dried and calcined at different temperatures to develop the alumino-silicate supported nano-oxide coats over honey-comb ceramic substrates for carrying out decomposition of N20 gas in a He flow in various flow rates at 400 to 600 C. temperature in a cylindrical quartz tube.

An extruded, solid honeycomb body comprises a copper-promoted, small pore, crystalline molecular sieve catalyst for converting oxides of nitrogen in the presence of a reducing agent, wherein the crystalline molecular sieve contains a maximum ring size of eight tetrahedral atoms, which extruded, solid honeycomb body comprising: 20-50% by weight matrix component comprising diatomaceous earth, wherein 2-20 weight % of the extruded, solid honeycomb body is diatomaceous earth; 80-50% by weight of the small pore, crystalline molecular sieve ion-exchanged with copper; and 0-10% by weight of inorganic fibres.

In order to specify a catalytic converter, especially SCR catalytic converter, with maximum catalytic activity, this catalytic converter has at least one catalytically active component and additionally at least one porous inorganic filler component having meso- or macroporosity. The organic porous filler component has a proportion of about 5 to 50% by weight. More particularly, a diatomaceous earth or a pillared clay material is used as the porous inorganic filler component.

This disclosure relates to a new crystalline microporous silicate solid, designated CIT-10, comprising a two dimensional layered structure, having an organic interlayer sandwiched between individual crystalline silicate layers. This CIT-10 material can be converted to a pure-silicate of RTH topology, as well as two new of pillared silicate structures, designated CIT-11 and CIT-12. This disclosure characterizes new materials and provides methods of preparing and using these new crystalline microporous solids.