Abstract
LPG contains 5-10 volppm of sulfur compounds such as thiols, sulfides, and disulfides. Use of LPG as the hydrogen source for fuel cells will require the removal of sulfur content to the ppb level. Active carbon, CuO/ZnO/Al2O3, Ag-exchanged β zeolite and Ag/CeO2 were examined as sulfur adsorbents at room temperature using propane containing 2-methyl-2-propane thiol (TBM: t -butyl mercaptane), dimethylsulfide (DMS), dimethyldisulfide (DMDS), and carbonyl sulfide (COS). Sulfur compounds were not removed effectively by active carbon. CuO/ZnO/Al2O3 showed excellent removal of TBM, but removal of DMS ceased after a short time. Ag-exchanged β zeolite achieved excellent removal of TBM, DMS and DMDS, but COS was not removed. Ag/CeO2 removed all types of sulfur compounds and provided superior removal of COS compared to the other sulfur adsorbents. Ag/CeO2 and CuO/ZnO/Al2O3 tended to adsorb reactive sulfur compounds more strongly. Ag-exchanged β zeolite adsorbed sulfur compounds associatively, and the larger the negative charge of the sulfur atom of the compound, the stronger the coordination bonding between the Ag cation and the sulfur atom of the compounds. In contrast, Ag/CeO2 adsorbed sulfur compounds dissociatively, and produced sulfur atoms at room temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
