Structured catalyst

A structured catalyst for catalyzing an endothermic reaction of a feed gas to convert it to a product gas, said structured catalyst comprising at least one macroscopic structure extending in a longitudinal direction from a first end to a second end, where said first end forms an inlet to said macroscopic structure for said feed gas and said second end forms an outlet for said product gas, said macroscopic structure comprising a three-dimensional network structure, wherein the network structure forms flow paths allowing the feed gas to flow from said first end to said second end, wherein the network structure is formed by a metallic material being electrically conductive and at least partly support a ceramic coating, the ceramic coating supporting a catalytically active material, wherein the network structure in a cross-section transverse to the longitudinal direction constitutes a fraction of a cross section of the macroscopic structure, the fraction being in the range of 4-75%, and wherein the network structure in at least three different cross-sections in the longitudinal direction constitute different fractions.