Catalyst for hydrogenating cis-butenedioic anhydride to prepare butanedioic anhydride and its preparation method and application
A technology for the preparation of succinic anhydride and hydrogen, which is applied in the catalyst for the preparation of succinic anhydride by maleic anhydride hydrogenation and its preparation and application fields, and can solve the problems of high nickel content in active components, large solvent circulation, and low processing capacity of maleic anhydride, etc. problems, achieve high selectivity, simple preparation method, and enhanced acid resistance
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Embodiment 1
[0025] Put diatomite (Jilin Changbai Diatomite Co., Ltd.) into dilute nitric acid solutions of different concentrations for soaking treatment. The concentration of nitric acid solution is 0.3mol / L, 0.2mol / L, 0.1mol / L, 0.08mol / L respectively; the soaking temperature is 60℃, 70℃, 80℃, 90℃ respectively; the soaking time is 2h respectively , 3h, 4h, 5h; filter after soaking. After the above treatment, an appropriate amount of diatomite and an appropriate amount of silica sol were kneaded and molded, dried at room temperature for 30 h, 25 h, 20 h, and 15 h, and then placed in an oven at 80°C, 100°C, 120°C, and 140°C respectively. Dry at ℃ for 50 h, 35 h, 20 h, 15 h. Finally, under the air atmosphere, keep the temperature at 300°C, 350°C, 400°C, and 350°C for 5h, 3h, 4h, and 2h, and then keep the temperature at 650°C, 700°C, 750°C, and 700°C for 10h, 8h, and 10h, respectively. , 12h, prepared different catalyst supports, the weight content of diatomaceous earth in the catalyst sup...
Embodiment 2
[0027] Use equal volumes of nickel nitrate hexahydrate and copper nitrate ammonia solution to impregnate the carrier with a weight content of 50% diatomite prepared in Example 1, let it stand at room temperature for 2 hours, and dry it at 100°C for 6 hours. In a muffle furnace, the air atmosphere Calcined at 550°C for 24 hours to obtain catalyst A, the content of nickel in the catalyst was 5wt%, and the content of copper was 2wt%.
Embodiment 3
[0029] Use nickel nitrate hexahydrate and copper nitrate ammonia solution to impregnate the carrier with a diatomite weight content of 80% prepared in Example 1, let it stand at room temperature for 2 hours, and dry it at 100°C for 6 hours. In a muffle furnace, the air atmosphere Calcined at 550°C for 24 hours to obtain catalyst B, the content of nickel in the catalyst was 7wt%, and the content of copper was 5wt%.
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