Kim, MH Kim, SJ Hong, SB Seo, G Uh, YS 2024-01-21T16:42:09Z 2024-01-21T16:42:09Z 2021-09-03 1998-09 0256-1115 https://pubs.kist.re.kr/handle/201004/142896 The adsorption of molecular oxygen at room temperature on the proton form of MFI zeolites with different Si/Al ratios has been investigated by temperature-programmed desorption (TPD). The internal Si-OH defects (silanol groups) in these zeolites are found to serve as O-2 adsorption sites. The apparent activation energies (17.5-21.8 kcal . mol(-1)) of desorption determined from O-2 TPD measurements reveal that the extent of interactions between the Si-OH defects and the adsorbed O-2 molecules becomes weaker with decreasing Al content in the zeolite. English KOREAN INSTITUTE CHEMICAL ENGINEERS PARAMAGNETIC DEFECT CENTERS SIEVES ZSM-5 Temperature-programmed desorption study of molecular oxygen adsorbed on MFI-type zeolites Article 10.1007/BF02707112 1 KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.15, no.5, pp.566 - 569 KOREAN JOURNAL OF CHEMICAL ENGINEERING 15 5 566 569 scie scopus 000076498900021 2-s2.0-3142575061 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article PARAMAGNETIC DEFECT CENTERS SIEVES ZSM-5 MFI zeolites internal silanol groups O-2 adsorption TPD