Preparation method of palladium-based supported hydrogenation catalyst and catalyst thereof
A hydrogenation catalyst and supported technology, which is applied in the field of preparation of palladium-based supported hydrogenation catalysts, can solve problems such as poor catalytic performance, particle aggregation, and inability to accurately control the dispersion of active component palladium, and achieve low manufacturing costs and high efficiency. High hydrogen activity and good stability
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Embodiment 1
[0029] Step (1), zinc nitrate hexahydrate (0.297g), polyvinylpyrrolidone (0.3g) and sodium chloropalladate solution (0.05mol / L, 3ml) were dissolved in 10ml methanol solution, 4.0g gac was dispersed in 10ml In the methanol solution, join in the above-mentioned salt solution, obtain system I; Step (2), dissolve 2-methylimidazole (0.082g) in the 10ml methanol solution, and join it in the system I; Step (3) , transfer the turbid liquid obtained in step (2) to a 250ml reaction kettle with a polytetrafluoroethylene liner, feed 1.0MPa hydrogen, react at 60°C for 2h, and the product is suction filtered, washed, and dried to obtain a catalyst Precursor; step (4), the precursor sample obtained in step (3) was treated at 900° C. for 3 hours under nitrogen atmosphere to obtain catalyst A. The XRD figure and thermogravimetric curve figure of the catalyst precursor prepared in step (3) are shown in respectively figure 1 and figure 2 .
Embodiment 2
[0031] Step (1), zinc nitrate hexahydrate (0.297g), polyvinylpyrrolidone (0.3g) and sodium chloropalladate solution (0.05mol / L, 3ml) were dissolved in 10ml methanol solution, 4.0g gac was dispersed in 10ml In the methanol solution, join in the above-mentioned salt solution, obtain system I; Step (2), dissolve 2-methylimidazole (0.164g) in the 20ml methanol solution, and join it in the system I; Step (3) , transfer the turbid liquid obtained in step (2) to a 250ml reaction kettle with a polytetrafluoroethylene liner, feed 1.0MPa hydrogen, react at 60°C for 2h, and the product is suction filtered, washed, and dried to obtain a catalyst precursor body; step (4), the sample obtained in step (3) was treated at 900° C. for 3 h under a nitrogen atmosphere to obtain catalyst B.
Embodiment 3
[0033] Step (1), zinc nitrate hexahydrate (0.297g), polyvinylpyrrolidone (0.3g) and sodium chloropalladate solution (0.05mol / L, 3ml) were dissolved in 10ml methanol solution, 4.0g gac was dispersed in 10ml In the methanol solution, join in the above-mentioned salt solution, obtain system I; Step (2), dissolve 2-methylimidazole (0.246g) in the 30ml methanol solution, and join it in the system I; Step (3) , transfer the turbid liquid obtained in step (2) to a 250ml reaction kettle with a polytetrafluoroethylene liner, feed 1.0MPa hydrogen, react at 60°C for 2h, and the product is suction filtered, washed, and dried to obtain a catalyst precursor body; step (4), the sample obtained in step (3) was treated at 900° C. for 3 h under a nitrogen atmosphere to obtain catalyst C.
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