Abstract: The present invention involves a system and method of oxidizing carbon monoxide in a preferential oxidizer for a hydrogen reformer of a fuel cell system for vehicular and stationary applications. The method includes providing a heat exchange system of the preferential oxidizer, wherein the heat exchange system has a single integrated oxidation reaction region in which an oxidation catalyst is disposed for oxidizing carbon monoxide to carbon dioxide. The method further includes introducing a hydrogen-rich reformate to the heat exchange system, wherein the hydrogen-rich reformate is at a predetermined temperature and has a first content of carbon monoxide. The method further includes injecting oxygen to the hydrogen-rich reformate, wherein the oxygen is at a predetermined stoichiometric oxygen/carbon monoxide ratio.

Abstract: The present invention involves an air cycle system having a preventative icing feature for climate control of a vehicle cabin. The air cycle system includes a compressor for compressing air, an intercooler for cooling compressed air, an expander for expanding air pressure, and a means for controlling conditions of air at atmospheric pressure. The compressor has a compressor inlet for ambient air and a compressor outlet for compressed air. The intercooler has an intercooler inlet for receiving compressed air from the compressor and an intercooler outlet for exiting intercooled air. The expander has an expander inlet for receiving air from the intercooler and has an expander outlet for exiting air at atmospheric pressure at an expanded condition. The expanded condition of the air at atmospheric pressure is above the icing temperature of water to prevent icing at the expander outlet.