REGENERABLE H2S SORBENTS WITH HIGH CAPACITY AND WIDE TEMPERATURE CHARACTERISTICS

摘要

Precious metals are widely used as catalysts in fuel processors to generate high purity hydrogen,and also used as electrode materials in fuel cells.These precious metals have low sulfur tolerance,i.e.0.1 ppmv sulfur for PEMFCs and 10 ppmv for SOFCs.Metal oxide based sorbents,such as zinc oxide (ZnO),iron oxide (F2O3),and copper oxide (CuO)have been widely used to remove sulfur compounds,mainly H2S,from gas fuels and reformate (1).From a fuel cell system startup,the fuel processing units experience a temperature change from room temperature to several hundred degree C.This requires a sorbent or a combination of sorbents to have a good performance over a wide working temperature window.