BIMETTALIC - DOPED ZNO SORBENTS FOR SIMULTANEOUS H2S REMOVAL AND COS HYDROLYSIS FROM REFORMATE STREAMS

摘要

High efficiency desulfurization is critical to maintain the activity of fuel processing catalysts in PEMFCs. ZnO is preferred metal oxide because of favorable sulfidation thermodynamics but is not efficient to remove COS . Addition of the dopant not o nly stabilizes the active sorbent by increasing active surface area and decreasing crystallite size, but may introduce defects with promoter behavior . Small particle size (100-200 microns) allows entrapment in the microfibrous media viable for composite bed design. The microfibrous media offer enhanced contacting efficiency and mass transfer without significant pressure drop .