Method for efficiently synthesizing 1R,2R-cyclohexanedimethanol by gas-solid phase technology
A technology of cyclohexanedimethanol and cyclohexanedicarboxylic acid, which is applied in the field of high-efficiency synthesis of 1R, 2R-cyclohexanedimethanol by gas-solid phase method, can solve problems such as the lack of chiral carboxylic acid hydrogenation technology, and prevent The effect of racemization
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[0026] In some embodiments, the preparation method of the catalyst comprises:
[0027] Impregnate the oxide support in a solution containing synergistic catalytic elements, dry it, then calcinate the dried material in air at 200-1200°C for 5-24h, and then impregnate the calcined product in a solution containing hydrogenation metal elements , and then dried to obtain a catalyst precursor, then calcining the catalyst precursor in air at 200-1200°C for 5-24h, and finally reducing it in a reducing atmosphere at 100-1000°C for 1-24h to obtain the catalyst;
[0028] Alternatively, the oxide carrier is impregnated in a mixed solution containing synergistic catalytic elements and hydrogenation metal elements, and then dried to obtain a catalyst precursor, and then the catalyst precursor is calcined in air at 200-1200° C. for 5-24 hours, and then performing a reduction reaction at 100-1000° C. for 1-24 hours in a reducing atmosphere to obtain the catalyst;
[0029] Alternatively, mix ...
Embodiment 1
[0047] Preparation of Pt / Re / silica catalyst: Add 2g of silica powder into the mixed solution of 0.005mol / L ammonium rhenate and 0.005mol / L chloroplatinic acid, mix thoroughly and evenly, and dry at 200°C in air Calcination for 5 h, followed by reduction in 5% hydrogen and 95% nitrogen at 100° C. for 1 h to obtain the catalyst.
Embodiment 2
[0049] Preparation of Ni / Mo / zsm-5 molecular sieve catalyst: Add 2.0g zsm-5 molecular sieve powder into the mixed solution of 0.005mol / L nickel nitrate and 0.005mol / L molybdic acid, mix well, and dry it before heating in air at 1200℃ Calcination for 24 hours, followed by reduction in 10% hydrogen and 95% argon at 1000° C. for 24 hours to obtain the catalyst.
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