title: Adsorption of butyl acetate in air over silver-loaded Y and ZSM-5 zeolites: experimental and modelling studies.
abstract: Adsorption behaviours of butyl acetate in air have been studied over silver-loaded Y (Si/Al=40) and ZSM-5 (Si/Al=140) zeolites. The silver metal was loaded into the zeolites by ion exchange (IE) and impregnation (IM) methods. The adsorption study was mainly conducted at a gas hourly space velocity (GHSV) of 13,000 h(-1) with the organic concentration of 1000 ppm while the desorption step was carried out at a GHSV of 5000 h(-1). The impregnated silver-loaded adsorbents showed lower uptake capacity and shorter breakthrough time by about 10 min, attributed to changes in the pore characteristics and available surface for adsorption. Silver exchanged Y (AgY(IE)) with lower hydrophobicity showed higher uptake capacity of up to 35%, longer adsorbent service time and easier desorption compared to AgZSM-5(IE). The presence of water vapour in the feed suppressed the butyl acetate adsorption of AgY(IE) by 42% due to the competitive adsorption of water on the surface and the effect was more pronounced at lower GHSV. Conversely, the adsorption capacity of AgZSM-5(IE) was minimally affected, attributed to the higher hydrophobicity of the material. A mathematical model is proposed to simulate the adsorption behaviour of butyl acetate over AgY(IE) and AgZSM-5(IE). The model parameters were successfully evaluated and used to accurately predict the breakthrough curves under various process conditions with root square mean errors of between 0.05 and 0.07.
authors.affiliation: School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300, Nibong Tebal, Penang, Malaysia. chbhatia@eng.usm.my
authors.forename: Subhash
authors.initials: S
authors.lastname: Bhatia
authors.forename: Ahmad Zuhairi
authors.initials: AZ
authors.lastname: Abdullah
authors.forename: Cheng Teng
authors.initials: CT
authors.lastname: Wong
mesh_terms: D000085:Acetates / Q000737:chemistry*; D000327:Adsorption; D000388:Air; D000465:Algorithms; D008956:Models, Chemical; D012834:Silver / Q000737:chemistry*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000085:Acetates; D017641:Zeolites; D012834:Silver; C006848:butyl acetate