The present invention relates to a system for the treatment of an exhaust gas of a diesel combustion engine, a process for preparation of such a system, and a use thereof. In particular, said system comprises a NOx adsorber component and a lean NOx trap component, wherein the NOx adsorber component is comprised in a first catalyst comprising a first substrate and a first coating comprising a platinum group metal supported on a zeolitic material; and wherein the lean NOx trap component is comprised in a second catalyst comprising a second substrate and a second coating comprising Pt and Pd both supported on a specific first non-zeolitic oxidic support material, wherein in said system the NOx adsorber component is arranged upstream of the lean NOx trap component.

The present invention provides a method for preparing acetic acid by carbonylation of methanol, which comprises: passing a raw material containing methanol, carbon monoxide and water through a reaction region loaded with a catalyst containing an acidic molecular sieve with an adsorbed organic amine, and carrying out a reaction under the following conditions to prepare acetic acid. The method in the present invention offers high acetic acid selectivity and good catalyst stability. The catalyst in the present invention does not contain noble metals such as rhodium or iridium, and does not need additional agent containing iodine, and thus does not generate a strong corrosive hydroiodic acid and the like.

The present invention provides a method for preparing acetic acid by carbonylation of methanol, which comprises: passing a raw material containing methanol, carbon monoxide and water through a reaction region loaded with a catalyst containing an acidic molecular sieve with an adsorbed organic amine, and carrying out a reaction under the following conditions to prepare acetic acid. The method in the present invention offers high acetic acid selectivity and good catalyst stability. The catalyst in the present invention does not contain noble metals such as rhodium or iridium, and does not need additional agent containing iodine, and thus does not generate a strong corrosive hydroiodic acid and the like.

A catalyst coating for use in a hydrolysis catalyst (H-catalyst) for the reduction of nitrogen oxides, a manufacturing method for such a coating, a catalyst structure and its use are described. The H-catalyst includes alkaline compounds, which are capable of adsorbing HNCO and/or nitrogen oxides and which include alkali and alkaline earth metals, lanthanum and/or yttrium and/or hafnium and/or prasedium and/or gallium, and/or zirconium for promoting reduction, such as for promoting the hydrolysis of urea and the formation of ammonia and/or the selective reduction of nitrogen oxides.

A catalyst coating for use in a hydrolysis catalyst (H-catalyst) for the reduction of nitrogen oxides, a manufacturing method for such a coating, a catalyst structure and its use are described. The H-catalyst includes alkaline compounds, which are capable of adsorbing HNCO and/or nitrogen oxides and which include alkali and alkaline earth metals, lanthanum and/or yttrium and/or hafnium and/or prasedium and/or gallium, and/or zirconium for promoting reduction, such as for promoting the hydrolysis of urea and the formation of ammonia and/or the selective reduction of nitrogen oxides.

Catalysts having a first catalyst coating and a second catalyst coating, the first catalyst coating including a blend of 1) Pt on a support, and 2) a molecular sieve, and the second catalyst coating including an SCR catalyst.

The present invention relates to a catalyst for the selective catalytic reduction of NOx and for the cracking and conversion of a hydrocarbon, comprising a substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the substrate extending therethrough: a coating disposed on the surface of the internal walls of the substrate, said coating comprising a platinum group metal, an 8-membered ring pore zeolitic material comprising one or more of copper and iron, and further comprising a 10- or more membered ring pore zeolitic material.

The present invention relates to a catalyst for the selective catalytic reduction of NOx and for the cracking and conversion of a hydrocarbon, comprising a substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the substrate extending therethrough: a coating disposed on the surface of the internal walls of the substrate, said coating comprising a platinum group metal, an 8-membered ring pore zeolitic material comprising one or more of copper and iron, and further comprising a 10- or more membered ring pore zeolitic material.

A method for modification of pretreated acidic porous material via selective cation exchange using suitable solvent to obtain higher noble metal dispersion is described herein. The solvent system required for cation exchange should have its dielectric constant in the range of 25-45, wherein this solvent property is found to impart significant effect on cation loading and distribution, which in turn defines the stability, dispersion of the noble metals. The catalyst so obtained has higher noble metal dispersion and when used for hydroisomerization reaction, leads to higher selectivity even at significantly high conversion values.

A method for modification of pretreated acidic porous material via selective cation exchange using suitable solvent to obtain higher noble metal dispersion is described herein. The solvent system required for cation exchange should have its dielectric constant in the range of 25-45, wherein this solvent property is found to impart significant effect on cation loading and distribution, which in turn defines the stability, dispersion of the noble metals. The catalyst so obtained has higher noble metal dispersion and when used for hydroisomerization reaction, leads to higher selectivity even at significantly high conversion values.