Highly porous inverted beaded catalyst monoliths made from SiC and SiCN were developed, and integrated these structures within high-density, non-porous alumina housings. Characterization of these microreactors using ammonia decomposition at ≤ 1000°C showed that Ru catalyst supported by SiC enhances its catalytic activity compared to Ru on alumina or silica. Steam reforming of propane using the same Ru/SiC monoliths above 800°C was examined. The monoliths showed exceptional stability and retention of activity. Coking can be avoided since they can be operated above 800°C. This is an abstract of a paper presented at the AIChE Annual Meeting (San Francisco, CA 11/12-17/2006).