No abstract

Summary A series of anion exchange membranes (quaternized chitosan/cation metal‐organic framework [MIL‐X‐QCS]) were prepared via purposeful inserting the cationic metal‐organic framework as the multifunctional filler into quaternized chitosan (QCS). The successful preparation of the anion exchange membrane was confirmed by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), and Scanning electron microscope (SEM). In this research, we converted the charge‐balanced MOFs skeleton Cr‐MIL‐101 into the cationic metal skeleton (Cr‐MIL‐101)+Cl− by anion stripping, and cooperated with quaternary amine groups to construct a high‐speed OH− transmission channel. The introduction of a rigid MOF structure reduces the water uptake and swelling ratio of the composite membrane by 27% and 37%, respectively. At 80°C, the OH− conductivity of the MIL‐9‐QCS membrane (The composite membrane doped with 9 wt% Cr‐MIL‐101 crystals) reaches 2.30 × 10−2 S·cm−1 and the power density reached its maximum (90.2 mW·cm−2), and the tensile strength reaches 20.12 MPa, which was higher than 18.7 MPa of Nafion‐115 membrane. The spatial network structure of MOFs reduced the methanol permeability of MIL‐9‐QCS membrane by 24% compared with the original QCS membrane. Furthermore, the MIL‐9‐QCS composite membrane exhibited excellent alkali stability, where after being soaked in 2 mol L−1 NaOH solution at 60°C for 240 hours, its OH− conductivity still reached 77% of the initial value.

Biodiesel was synthesized by transesterification of soybean oil and methanol over a silica‐supported morpholine alkaline ionic liquid catalyst (SILC). Characterization of SILC was performed using 1H‐nuclear magnetic resonance (1H‐NMR), Fourier‐transform infrared spectroscopy (FT‐IR), x‐ray diffraction, thermogravimetric analysis (XRD), and nitrogen adsorption‐desorption isotherms. Transesterification proceeded satisfactorily over SILC at ambient pressure and without simultaneous water removal. Under optimal reaction conditions, including 60°C, 4 hours, reactant/catalyst molar ratio of 14/1, and 3‐wt% catalyst, a high yield of biodiesel (94.5%) was obtained. SILC's reusability was more than six times, with no obvious decrease in catalytic activity observed.

A series of porous con ned ionic liquid phosphotungstate were synthesized by encapsulated of 1-(3sulfopropyl)morpholine phosphotungstate ([C 3 SO 3 Hnhm] 3 -PW 12 O 40 ) into MIL-101. Then the aforementioned porous con ned ionic liquid phosphotungstate as heterogeneous catalyst will be used together with H 2 O 2 for the catalytic synthesis of adipic acid from cyclohexene. During the experiment, the effect of weight content of [C 3 SO 3 Hnhm] 3 PW 12 O 40 on the catalytic performance was investigated in detail. And the chemical structure of the catalyst was also characterized by XRD, FT-IR, SEM-EDX and N 2 adsorption and desorption isotherms. Experimental results revealed that the desired products has been successfully prepared, and the best catalytic performance (81.2% yield of the adipic acid) was obtained under the dose of [C 3 SO 3 Hnhm] 3 PW 12 O 40 was 31wt%, which was almost close to the catalytic activity of original [C 3 SO 3 Hnhm] 3 PW 12 O 40 (85.3% yield of the adipic acid), which was also proved the strategy of packaging ionic liquid phosphotungstate with MIL-101 in this research is feasible. Furthermore, recycled catalytic performance of the catalyst under repeat 6 times was evaluated and the result revealed that the yield in adipic acid was still higher than 80.0%, which also proved that the catalytically active substance was stable in the catalyst.

A series of porous confined ionic liquid phosphotungstate were synthesized by encapsulated of 1-(3-sulfopropyl)morpholine phosphotungstate ([C3SO3Hnhm]3 -PW12O40) into MIL-101. Then the aforementioned porous confined ionic liquid phosphotungstate as heterogeneous catalyst will be used together with H2O2 for the catalytic synthesis of adipic acid from cyclohexene. During the experiment, the effect of weight content of [C3SO3Hnhm]3PW12O40 on the catalytic performance was investigated in detail. And the chemical structure of the catalyst was also characterized by XRD, FT-IR, SEM-EDX and N2 adsorption and desorption isotherms. Experimental results revealed that the desired products has been successfully prepared, and the best catalytic performance (81.2% yield of the adipic acid) was obtained under the dose of [C3SO3Hnhm]3PW12O40 was 31wt%, which was almost close to the catalytic activity of original [C3SO3Hnhm]3PW12O40 (85.3% yield of the adipic acid), which was also proved the strategy of packaging ionic liquid phosphotungstate with MIL-101 in this research is feasible. Furthermore, recycled catalytic performance of the catalyst under repeat 6 times was evaluated and the result revealed that the yield in adipic acid was still higher than 80.0%, which also proved that the catalytically active substance was stable in the catalyst.