Abstract: This invention is an improved catalyst structure and its use in highly exothermic processes like catalytic combustion. This improved catalyst structure employs integral heat exchange in an array of longitudinally disposed, adjacent reaction passage-ways or channels, which are either catalyst-coated or catalyst-free, wherein the configuration of the catalyst-coated channels differs from the non-catalyst channels such that, when applied in exothermic reaction processes, such as catalytic combustion, the desired reaction is promoted in the catalytic channels and substantially limited in the non-catalyst channels.

Abstract: A support structure for securing a catalyst structure wherein a combustion reactor has a plurality of hollow, internally cooled, elongated support members which are secured to the combustion reactor and which abut the catalyst structure to limit the axial movement of the catalytic structure. The support structure is in fluid communication with a cooling medium which maintains the support structure at a temperature at which its strength properties are retained.