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| Preparation of nickel-copper catalyst and its catalytic selective hydrogenation of industrial oleic acid |
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| DOI： |
| KeyWord:high purity oleic acid selective hydrogenation Ni-Cu/SiO2 catalyst |
| FundProject:国家自然科学基金资助项目（21978112） |
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| Abstract: |
| In order to obtain high purity oleic acid, Ni(NO3)2·6H2O and Cu(NO3)2·3H2O were used as raw materials to prepare Ni-Cu/SiO2 catalyst by co-precipitation method, and selective hydrogenation of industrial oleic acid was catalyzed to prepare high purity oleic acid. The effects of the molar ratio of Ni to Cu, calcination temperature, calcination time, reduction temperature and reduction time on the yield and selectivity of oleic acid were investigated by single factor experiments to optimize the preparation conditions of Ni-Cu/SiO2 catalyst. The reusability of the catalyst was investigated. The Ni-Cu/SiO2 catalyst was characterized by EDS, SEM, BET, XRD and XPS. The results showed that the optimal conditions for preparation of Ni-Cu/SiO2 catalyst were as follows: molar ratio of Ni to Cu 1∶ 3, calcination temperature 400 ℃, calcination time 4 h, reduction temperature 270 ℃ and reduction time 2 h. Under these conditions, the yield and selectivity of oleic acid reached 72.11% and 88.54% respectively, and the oleic acid content in the product was above 83%. The prepared catalyst had certain reusability. The results of catalyst characterization showed that Ni and Cu formed a good alloy phase, which was well dispersed in SiO2, and the catalyst had a large specific surface area, which maintained the pore size of the carrier. In summary, high purity oleic acid can be obtained by preparing Ni-Cu/SiO2 catalyst by co-precipitation method and selective hydrogenation. |
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