Application method of magnetic molybdenum-based catalyst in catalysis of p-nitrophenol

Abstract

The invention relates to an application method for a magnetic molybdenum-based catalyst in the catalysis of p-nitrophenol. The method comprises that a catalytic reduction reaction is carried out by mixing p-nitrophenol, the magnetic molybdenum-based catalyst and a reducing agent to obtain p-aminophenol. The method has high efficiency for catalytic reduction of p-nitrophenol. The magnetic molybdenum-based catalyst used in the reaction process can be recovered by utilizing magnetic properties of the catalyst after the reaction is completed, so that the catalyst can be recycled and reused, and efficiency decline of the catalyst is relatively low after being recycled and reused.

Description

technical field [0001] The invention relates to the field of catalytic reduction of p-nitrophenol, in particular to an application method of a magnetic molybdenum-based catalyst in the catalysis of p-nitrophenol. Background technique [0002] p-Nitrophenol is an organic pollutant commonly found in pharmaceutical, textile, leather and other industries, and has carcinogenic side effects. In addition, p-aminophenol is a very important pharmaceutical intermediate in the production of analgesic and antipyretic agents. The catalytic reduction of p-nitrophenol to prepare p-aminophenol can not only effectively solve the pollution problem, but also create considerable economic benefits. [0003] In the process of preparing p-aminophenol by catalytic reduction of p-nitrophenol, sodium borohydride is used as reducing agent, and a suitable catalyst is selected to accelerate the reaction. At present, most processes use noble metals as catalysts, such as platinum, gold, palladium, silve...

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Problems solved by technology

[0004] CN105664976A discloses a composite nano-catalyst material loaded with precious metals (Ag, Au) and its application in catalytic reduction of p-nitrophenol, the method is by loading Ag and Au on the molybdenum sulfide of nanosheet structure, thereby improving The activity of the catalyst, the catalyst adopts noble metal Ag and Au, and its Ag load is 0.5-40wt%, so that the catalytic cost of the catalyst is significantly increased, thereby limiting the industrial application of the catalyst, and after the catalytic reaction is completed, the catalyst’s Low recovery rate and poor catalyst cycle performance

The catalyst uses metal Pt as the active center, and γ-Al 2 o 3 As a carrier, and modified with ionic liquid BMI PF6, the Pt 4+ loaded on γ-Al 2 o 3 Above; the catalyst obtained by this scheme contains noble metal Pt, and its preparation cost is high, which is not conducive to industrial application, and after the catalytic reduction reaction is completed, the recovery rate of the catalyst is low and the cycle performance is poor

[0006] CN105618038A discloses a supported gold catalyst and its application in catalytic reduction of p-nitrophenol to prepare p-aminophenol. The supported gold catalyst contains silicon dioxide and gold nanoparticles supported on the silicon dioxide; The method described in this scheme uses gold as the active center of catalytic reduction, so that the cost of the catalyst is significantly increased, and the catalyst is difficult to recycle after the catalytic reaction is completed.

[0007] Although the above-mentioned documents provide some catalysts and application methods thereof for catalytic reduction of p-nitrophenol, there are still problems that the catalyst cost is high, the catalyst recovery rate is low after the catalytic reaction finishes, and the catalyst cycle performance is poor. Catalysts with low catalytic efficiency and high catalyst recovery rate are still of great significance for the catalytic reduction of p-nitrophenol

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