Pervaporation performance of PDMS-NiY zeolite hybrid membranes in the desulfurization of gasoline |
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Authors: | Ben Li Dan XuZhongyi Jiang Xiongfei ZhangWanpeng Liu Xiao Dong |
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Institution: | Key Laboratory for Green Chemical Technology, Ministry of Education of China, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China |
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Abstract: | PDMS-Ni2+Y zeolite hybrid membranes were fabricated and used for the pervaporation removal of thiophene from model gasoline system. The structural morphology, mechanical stability, crystallinity, and free volume characteristics of the hybrid membranes were systematically investigated. Molecular dynamics simulation was employed to calculate the diffusion coefficients of small penetrants in the polymer matrix and the zeolite. The effect of Ni2+Y zeolite content on pervaporation performance was evaluated experimentally. With the increase of Ni2+Y zeolite content, the permeation flux increased continuously, while the enrichment factor first increased and then decreased possibly due to the occurrence of defective voids within organic–inorganic interface region. The PDMS membrane containing 5.0 wt% Ni2+Y zeolite exhibited the highest enrichment factor (4.84) with a permeation flux of 3.26 kg/(m2 h) for 500 ppm sulfur in feed at 30 °C. The effects of operating conditions on the pervaporation performance were investigated in detail. It has been found that the interfacial morphology strongly influenced the separation performance of the hybrid membrane, and it was of great significance to rationally modify the interfacial region in order to improve the organic–inorganic compatibility. |
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Keywords: | PDMS Ni2+Y zeolite Hybrid membrane Pervaporation Gasoline desulfurization |
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