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Zhenjiang He,Yuxi Yang,Peng Bai,Xianghai Guo 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Selective adsorption and separation of three xylene isomers of seven stable metal-organic frameworks(MOFs) were investigated, where MIL-53(Cr) manifested the highest adsorption capacity and apparentpreference for o-xylene. Further detailed studies with MIL-53(Cr) showed that pseudo-second-ordermodelfit best with adsorption kinetics of xylene isomers, and the isotherms were perfectlyfitted byLangmuir isotherm model. The adsorption was proved to be a quick process, and both the changes ofentropy and enthalpy contributed to the o-xylene selectivity, but which mainly resulted from the entropyeffect. The adsorption capacity of preferable isomer o-xylene, on account of better packing efficiency, wasrecord-breaking 8.19 mmol/g, and selectivity of OX/PX, OX/MX and MX/PX were 13.75, 8.01 and 1.72,respectively. Both the adsorption capacity and OX selectivity on MIL-53(Cr) in liquid phase adsorptionand breakthrough experiments were super high, which discriminated it from zeolites and other materialsreported so far. Combined with extremely short equilibrium time and high stability, MIL-53(Cr) can be apromising adsorbent for separation of xylenes in industrial process.