Selective removal of sulfur compounds in city-gas by adsorbents

• Published in: The Korean journal of chemical engineering Vol. 24; no. 6; pp. 1124 - 1127
• Main Authors: Ko, Chang Hyun, Song, Hirn-Ill, Park, Jong-Ho, Han, Sang-Sup, Kim, Jong-Nam
• Format: Journal Article
• Language: English
• Published: 한국화학공학회 01.11.2007
• Subjects: 화학공학
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-007-0132-5

nitrate impregnated on beta zeolite (BEA), mesoporous silica MCM-41 and SBA-15 (AgNO3/BEA,AgNO3/MCM-41, AgNO3/SBA-15) were prepared to remove sulfur compounds selectively in city-gas, which containstetrahydrothiophene and tert-butylmercaptane. Sulfur adsorption capacity was determined when the sulfur concentra-tion of effluent gas in breakthrough test reached 0.1 ppm, which is acceptable sulfur concentration for hydrogen pro-duction in a reformer for fuel cells. As the AgNO3 concentration in AgNO3/BEA, AgNO3/MCM-41, and AgNO3/SBA-15 increased, their sulfur adsorption capacities also increased. Although microporous zeolite BEA has smaller porevolume and lower surface area than those of mesoporous silica MCM-41 and SBA-15, the sulfur adsorption capacityof AgNO3/BEA was higher than those of AgNO3/MCM-41 and AgNO3/SBA-15. Adsorbed sulfur molecules per im-pregnated silver nitrate and the shape change of breakthrough curves depending on the adsorption temperature showedthat not only chemisorption but also physisorption was involved in sulfur compounds adsorption on AgNO3 im-pregnated adsorbent. KCI Citation Count: 10