This invention relates to a method of preparing a mixed manganese ferrite coated catalyst, and a method of preparing 1,3-butadiene using the same, and more particularly, to a method of preparing a catalyst by coating a support with mixed manganese ferrite obtained by co-precipitation at 1040 C. using a binder and to a method of preparing 1,3-butadiene using oxidative dehydrogenation of a crude C4 mixture containing n-butene and n-butane in the presence of the prepared catalyst. This mixed manganese ferrite coated catalyst has a simple synthetic process, and facilitates control of the generation of heat upon oxidative dehydrogenation and is very highly active in the dehydrogenation of n-butene.

This invention relates to a method of preparing a mixed manganese ferrite coated catalyst, and a method of preparing 1,3-butadiene using the same, and more particularly, to a method of preparing a catalyst by coating a support with mixed manganese ferrite obtained by co-precipitation at 1040 C. using a binder and to a method of preparing 1,3-butadiene using oxidative dehydrogenation of a crude C4 mixture containing n-butene and n-butane in the presence of the prepared catalyst. This mixed manganese ferrite coated catalyst has a simple synthetic process, and facilitates control of the generation of heat upon oxidative dehydrogenation and is very highly active in the dehydrogenation of n-butene.

Described is a monolithic support member comprising channels with walls separating the channels and having a coating deposited thereon, the non-coated channels having a polygonal cross-section profile, wherein the mean thickness d.sub.C of the coating in a corner of said cross-section profile is smaller than or equal to the mean thickness d.sub.E of the coating on an edge of said cross-section profile plus 85 micrometer. Also described is a method for the preparation of such coated monolithic support member. Further described is the use of such coated monolithic support member as a catalytic article in automotive exhaust gas treatment.

A honeycomb filter includes a plurality of cells, porous cell walls, and an oxidation catalyst. The plurality of cells include exhaust gas introduction cells and exhaust gas emission cells. The oxidation catalyst is supported inside the porous cell walls in an amount of 5 to 60 g/L. The exhaust gas emission cells have an average cross sectional area larger than an average cross sectional area of the exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction. A total volume of the exhaust gas introduction cells is larger than a total volume of the exhaust gas emission cells.

A honeycomb filter includes a plurality of cells, porous cell walls, and an oxidation catalyst. The plurality of cells include exhaust gas introduction cells and exhaust gas emission cells. The oxidation catalyst is supported inside the porous cell walls in an amount of 5 to 60 g/L. The exhaust gas emission cells have an average cross sectional area larger than an average cross sectional area of the exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction. A total volume of the exhaust gas introduction cells is larger than a total volume of the exhaust gas emission cells.

Provided is an ammonia synthesis system including an ammonia synthesis reactor; two or more catalyst beds included in the ammonia synthesis reactor; a backflow prevention plate disposed downstream from each of the catalyst beds except for the catalyst bed disposed at the lowest of the two or more catalyst beds for preventing a backflow of mixed gas; a distribution device disposed upstream from each of the two or more catalyst beds for distributing the mixed gas to the catalyst bed; mixed gas supply lines arranged to supply the mixed gas to each distribution device; and a microwave heating device for emitting microwaves to each of the two or more catalyst beds, wherein the catalyst bed contains a microwave reactive catalyst mixture including a catalyst and a carbon body.

Provided is an ammonia synthesis system including an ammonia synthesis reactor; two or more catalyst beds included in the ammonia synthesis reactor; a backflow prevention plate disposed downstream from each of the catalyst beds except for the catalyst bed disposed at the lowest of the two or more catalyst beds for preventing a backflow of mixed gas; a distribution device disposed upstream from each of the two or more catalyst beds for distributing the mixed gas to the catalyst bed; mixed gas supply lines arranged to supply the mixed gas to each distribution device; and a microwave heating device for emitting microwaves to each of the two or more catalyst beds, wherein the catalyst bed contains a microwave reactive catalyst mixture including a catalyst and a carbon body.

An exhaust gas purification device includes a catalyst converter purifying exhaust gas from an exhaust manifold. The catalyst converter includes a metal porous body through which exhaust gas from the exhaust manifold passes, and an exhaust gas purification catalyst purifying exhaust gas passing through the porous body. The exhaust gas purification catalyst is electrically heated, with a pair of electrodes attached to a catalyst main body. Through-holes are formed in the porous body along the exhaust gas from upstream to downstream. Metal material is exposed on a surface of the porous body. Under a temperature environment of 25 C., a ratio of a heat capacity of the porous body to that of the catalyst main body is 8% or greater and 23% or smaller.

An exhaust gas purification device includes a catalyst converter purifying exhaust gas from an exhaust manifold. The catalyst converter includes a metal porous body through which exhaust gas from the exhaust manifold passes, and an exhaust gas purification catalyst purifying exhaust gas passing through the porous body. The exhaust gas purification catalyst is electrically heated, with a pair of electrodes attached to a catalyst main body. Through-holes are formed in the porous body along the exhaust gas from upstream to downstream. Metal material is exposed on a surface of the porous body. Under a temperature environment of 25 C., a ratio of a heat capacity of the porous body to that of the catalyst main body is 8% or greater and 23% or smaller.

A method of producing a supported palladium catalyst includes the steps of: oxidizing a palladium compound by heating; dissolving the palladium compound after the heating in a solvent to prepare a palladium compound solution; and bringing the palladium compound solution into contact with a carrier.