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Enhanced Selectivity and Uptake Capacity of CO 2 and Toluene Adsorption in Co 0.5 M 0.33 MoS 4 (M= Sb or Y) Chalcogels by Impregnated Metal Salts
Author(s) -
Edhaim Fatimah,
Rothenberger Alexander
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702393
Subject(s) - physisorption , selectivity , toluene , cyclohexane , adsorption , amorphous solid , metal , materials science , supercritical fluid , nuclear chemistry , chemistry , inorganic chemistry , organic chemistry , catalysis
The synthesis of metal chalcogenide aerogels Co 0.5 M 0.33 MoS 4 (M= Sb or Y) by the sol‐gel method is reported. In this system, the building blocks [MoS 4 ] 2− chelated with Co 2+ and (Sb 3+ ) or (Y 3+ ) salts in nonaqueous solvents forming amorphous networks with a gel property. The chalcogels obtained after supercritical drying have BET surface areas of 176 m 2 g −1 (Co 0.5 Sb 0.33 MoS 4 ) and 145 m 2 g −1 (Co 0.5 Y 0.33 MoS 4 ). Electron microscopy and physisorption studies reveal that the new materials are porous with wide pore size distribution and average pore width of 16 nm. These chalcogels show higher adsorption capacity of toluene vapor (Co 0.5 Sb 0.33 MoS 4 : 387 mg g −1 ) and (Co 0.5 Y 0.33 MoS 4 : 304 mg g −1 ) over cyclohexane vapor and high selectivity of CO 2 over CH 4 or H 2 , Co 0.5 Sb 0.33 MoS 4 (CO 2 /H 2 : 80 and CO 2 /CH 4 : 21), Co 0.5 Y 0.33 MoS 4 (CO 2 /H 2 : 27 and CO 2 /CH 4 : 15). We also demonstrated that the impregnation of various metal species like Li + , Mg 2+ , and Ni 2+ significantly enhanced the uptake capacity and selectivity of toluene and CO 2 adsorptions in the chacogels.