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采用三甲基氯硅烷(TMCS)对MIL-101(Cr)进行表面改性处理以改变材料的疏水亲油性能,经XRD、FT-IR、N2吸附和脱附、表面羟基滴定等表征证明TMCS分子通过与MIL-101(Cr)表面羟基缩合进入骨架。采用C5~C7正构烷烃模拟油气组份,测试了MIL-101(Cr)和TMCS-MIL-101(Cr)的油气和水蒸气的静态吸附性能,并考察了相对湿度对油气动态吸附性能的影响。结果表明,25℃下C5~C7正构烷烃以及水蒸气在TMCS-MIL-101(Cr)上静态吸附量分别为0.433、0.510、0.464和0.233 g?g?1,与MIL-101(Cr)相比TMCS-MIL-101(Cr)的C5~C7正构烷烃静态吸附量较高,水蒸气静态吸附量较低;根据穿透曲线计算,在相对湿度97%时TMCS-MIL-101(Cr)对C5~C7正构烷烃的动态吸附量为相对湿度0%时的80%以上。改性后材料的油气静态吸附性能提升明显,且水蒸气对TMCS-MIL-101(Cr)油气吸附影响较小。
The surface modification of MIL-101 (Cr) with trimethylchlorosilane (TMCS) to change the hydrophobic and lipophilic properties of the material. Characterization of the TMCS by XRD, FT-IR, N2 adsorption and desorption, surface hydroxyl titration Molecules enter the framework by condensation with the hydroxyl groups on the surface of MIL-101 (Cr). The static adsorption properties of oil and gas of MIL-101 (Cr) and TMCS-MIL-101 (Cr) were tested using C5-C7 normal paraffins to simulate oil and gas components. The effects of relative humidity on the dynamic adsorption properties of oil and gas influences. The results show that the static adsorption capacities of C5 ~ C7 n-alkanes and water vapor on TMCS-MIL-101 (Cr) at 25 ℃ are 0.433, 0.510, 0.464 and 0.233 g? G? Compared with TMCS-MIL-101 (Cr), the static adsorption capacity of C5-C7 n-alkanes is high and the static adsorption capacity of water vapor is low. According to the breakthrough curves, ) The dynamic adsorption amount of C5-C7 normal paraffins is 80% or more at 0% relative humidity. The static adsorption properties of the modified materials increase obviously, and the water vapor has little effect on the adsorption of TMCS-MIL-101 (Cr) oil and gas.