Preparation method of Ni-based catalyst modified by aid Pt supported by multi-wall carbon nanotube as carrier and application

Abstract

The invention discloses a preparation method of a Ni-based catalyst modified by an aid Pt supported by multi-wall carbon nanotubes as a carrier and application. The preparation method comprises the following steps: firstly, performing acid modification on multi-wall carbon nanotubes by using nitro-sulfuric acid; by taking the multi-wall carbon nanotubes as a carrier, putting precursor salts of platinum and nickel according to the multi-wall carbon nanotubes to hexachloroplatinic acid hexahydrate and nickel nitrate hexahydrate according to a mass ratio of (5-10):(0.1-0.5):(5-10); further addingdeionized water, performing ultrasonic stirring, drying, and performing roasting and reduction, thereby finally obtaining an expected catalyst Pt-Ni / MWCNT. The catalyst prepared by using the method is low in cost, economic and effective, good in universality, good in environmental-friendliness, free of equipment corrosion and good in circulation property, and is relatively high in activity and relatively high in p-aminophenol selectivity under a relative gentle reaction condition in a process that p-aminophenol is prepared from nitrobenzene through one-step hydrogenation rearrangement, the production conditions can be improved, the production cost is reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method and application of a Ni-based catalyst modified by using multi-walled carbon nanotubes as a carrier to support Pt as an auxiliary agent. Background technique [0002] P-aminophenol (hereinafter referred to as PAP) is an important chemical raw material and organic intermediate in today's society. It is widely used in medicine, dyes, rubber and photography industries. In my country, PAP is mainly used in the pharmaceutical industry. As a pharmaceutical intermediate, PAP can be used to synthesize paracetamol (paracetamol), paracetamol, clofibrate, vitamin B1, propanol, compound agents nicotinamide, lauanol, 6- Hydroxyquinoline and other drugs, among which paracetamol is the most consumed. In the 1970s, researchers discovered that taking antipyretic and painkillers such as acetanilide and phenethyl ether would decompose into harmful components in the body. The...

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Problems solved by technology

Chinese patent CN1283612A discloses a supported Pt / γ-alumina-MEO catalyst, which catalyzes nitrobenzene under sulfuric acid conditions. The loading of active components is 0.5-5%. Although the selectivity of p-aminophenol can reach 70 %, the reaction is carried out under the sulfuric acid system, which needs to be neutralized with alkaline substances, which causes inconvenience to product separation, and will generate some waste water at the same time, which is more serious to environmental pollution and has a certain corrosion effect on the catalyst. Complex and large dosage, high product cost, and high content of metal oxidation waste, it is difficult to be used as medicine

Chinese patent CN103553943A discloses to use Pt / C, Pt-Sn / Al under the condition of carbon dioxide and water system 2 o 3 , Pd-CaCO 3 -PbO / PbAC 2 A series of catalysts, under the pressure of hydrogen 0.3-5MPa, carbon dioxide 0.5-10MPa, temperature 80-170 ℃, reaction time 0.5-12h, selectivity is about 5-70%, but the reaction pressure of hydrogen and carbon dioxide is relatively high , the reaction temperature is high, the reaction time is long, the requirements for the reaction device are very high, the preparation of the catalyst is complicated and the content of the active component of the catalyst is high. If the platinum carbon catalyst is used, the pores of the activated carbon are relatively deep, which is not good for the desorption of the product.

[0005] In summary, the yield of nitrobenzene in the above process routes is not very high, and some process routes have relatively harsh reaction conditions