Heterogeneous supported hydrogenation catalyst, preparation method thereof and application of heterogeneous supported hydrogenation catalyst in preparation of poly (cyclohexyl ethylene) through hydrogenation
A hydrogenation catalyst and supported technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical recovery, etc., can solve the problems of cumbersome catalyst preparation, limited service life, cumbersome preparation, etc. Sexual process, not easy to lose, good dispersion effect
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Embodiment 1
[0033] 1.0 g industrialized SiO 2 The carrier was added to 50 mL of dichloromethane solvent to make mixed solution A, and 0.2 g of γ-aminopropyltriethoxysilane reagent was dissolved in 5 mL of dichloromethane solvent to make solution B. Mix A and B well and place at 50 o C in a constant temperature oil bath for 20 h. After the reaction, the mixture was centrifuged and dispersed in 50 mL acetone solvent for washing for 4 h; centrifuged again and the centrifuged product was dried to prepare the amino-modified carrier N-SiO 2 . After drying 1.0 g of N-SiO 2 The carrier was added to 50 mL of dichloromethane solvent to prepare a mixed liquid C. 0.0211 g Pd(OAc) 2 Dissolve in 5 mL of chloroform solvent to make Pd(OAc) 2 Dipping solution D. Put C at 50 o C was stirred and heated in a constant temperature oil bath, then D was slowly added to C to react for 20 h, and the reacted solution was cooled and dried by centrifugation. Finally, at 130 o C.H 2 The heterogeneous cataly...
Embodiment 2
[0035] Take the same method as in Example 1 to prepare the carrier N-SiO after amino modification 2 . 1.0 g N-SiO 2 The carrier was added into 50mL of dichloromethane solvent to make mixed solution A; 0.063 g Pd(OAc) 2 Dissolve in 5 mL of chloroform solvent to make Pd(OAc) 2 Dipping solution B. Put A at 50 o C was stirred and heated in a constant temperature oil bath, and then B was slowly added to A to react for 20 h, and the reacted solution was cooled and centrifugally dried. Finally, at 130 o C.H 2 The heterogeneous catalyst Pd with a Pd loading of 3.0 wt.% was prepared by reduction under atmosphere for 2 h 3.0 / N-SiO 2 . Using the same hydrogenation operation and conditions as in Example 1, its catalytic hydrogenation performance on PS was investigated, and the degree of hydrogenation is listed in Table 1.
Embodiment 3
[0037] The catalyst synthesis steps are the same as in Example 2, and the heterogeneous catalyst Pd with a loading capacity of 3.0 wt.% is obtained 3.0 / N-SiO 2 . Dissolve 1.65 g of PS with a number average molecular weight of 250,000 g / mol in 70 mL of cyclohexane to prepare a PS glue solution with a concentration of 3.0 wt.%. 3.0 / N-SiO 2 and PS glue solution are transferred to the autoclave, and the catalytic hydrogenation reaction is carried out in the autoclave. Using the same hydrogenation operation and conditions as in Example 1, its catalytic hydrogenation performance on PS was investigated, and the degree of hydrogenation is listed in Table 1.
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