Elevated temperature combinatorial catalytic reactor

A reactor for conducting catalytic chemical reactions has been developed. The reactor has a housing having an open end and a closed end. The reactor also has a sleeve having a top end and a bottom end. The bottom end of the sleeve is inserted within the open end of the housing. A fluid permeable structure is attached to the sleeve spanning the cross-section thereby defining a chamber between the closed end of the housing and the fluid permeable structure. The reactor also has a reactor insert having a first end and a second end containing a first and a second fluid conduit. The first end of the reactor is inserted within the top end of the sleeve.