Preparation method of low-cost selective hydrocracking catalyst

Abstract

The invention provides a preparation method of a low-cost selective hydrocracking catalyst. The preparation method comprises the following steps: (1) taking terbium oxide as a carrier to load metal nickel salt and then roasting in an air atmosphere to obtain nickel oxide loaded by terbium oxide; (2) evenly mixing a compound obtained in step (1) with diacetylamine and carbon tetrachloride and performing a reflux reaction in dimethylbenzene to obtain a catalyst precursor coated with a nitrogen-containing polymer; or mixing the compound obtained in the step (1) with glucose and a nitrogen-containing compound to obtain a catalyst precursor; and (3) roasting the catalyst precursor in an inert atmosphere at the high temperature of 500 to 1000 DEG C to obtain a nitrogen-doped carbon hydrogenationcatalyst coated with metal nickel. The catalyst is applied to catalysis of nitrobenzene to synthesize p-aminophenol by hydrogenation; and the conversion rate of the nitrobenzene and the selectivity of the p-aminophenol both can reach 100%.

Description

technical field [0001] The invention relates to a preparation method of a low-cost selective hydrocracking catalyst. Background technique [0002] p-Aminophenol is an important organic intermediate widely used in medicine, dyestuff and rubber and other fields. At present, the industrial production process of p-aminophenol is mainly produced in one step by catalyzing the hydrogenation of nitrobenzene in a strong acidic solution. The catalyst used in this process condition is usually a supported noble metal platinum or palladium catalyst, nitro The conversion rate of benzene can reach 90%, and the selectivity of p-aminophenol is about 85%. However, in a strongly acidic reaction medium (usually 15wt.% sulfuric acid aqueous solution), the noble metal may be poisoned and the active components will also be lost, which will have a negative impact on the service life of the catalyst and the control of production costs . [0003] In order to improve the production process under su...

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Problems solved by technology

However, in a strongly acidic reaction medium (usually 15wt.% sulfuric acid aqueous solution), the noble metal may be poisoned and the active components will also be lost, which will have a negative impact on the service life of the catalyst and the control of production costs

[0003] In order to improve the production process under such strong acidic conditions, it has also been proposed to use solid acid instead of liquid sulfuric acid to catalyze the hydrogenation of nitrobenzene to synthesize p-aminophenol in aqueous solution, thereby reducing the loss of active components. However, this process design requires A large amount of solid acid is added, and the active components of precious metals are still exposed to the acidic environment, so the loss of active components cannot be avoided; in addition, the use of solid acids instead of sulfuric acid will reduce the selectivity of p-aminophenol