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Catalyst applied to continuous hydrogenation of aromatic nitro compound and preparation method

A technology for catalysts and nitro compounds, which is used in the field of catalysts and preparation for the continuous hydrogenation of aromatic nitro compounds, can solve the problems of limited catalytic activity, small specific surface area, limited active sites, etc., and achieves high atom economy and high Specific surface area and less by-products

Pending Publication Date: 2022-04-08
SHENYANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But a single g-C 3 N 4 There are still small specific surface area and limited active sites, so the catalytic activity is limited

Method used

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  • Catalyst applied to continuous hydrogenation of aromatic nitro compound and preparation method
  • Catalyst applied to continuous hydrogenation of aromatic nitro compound and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1Pt / Ni / g-C 3 N 4 Catalyst preparation

[0044] Mix 20 g of urea powder and 6.2 g of nickel nitrate, add 5 g of pure water, grind, and dry to obtain a composite solid. 10 g of the composite solid was added to a 50 ml crucible, and the temperature was raised to a calcination temperature of 550 ° C at a heating rate of 10 ° C per minute in a tube furnace under helium purging conditions, and kept for 2 hours. After being naturally cooled to room temperature and after the calcination, the obtained composite carrier is molded, and the particle size is 0.4-0.6 mm. Add 1.0 g of the composite carrier into 200 g of pure water and stir. Heating in a water bath at 80° C., and adding a certain amount of chloroplatinic acid (the active metal Pt accounts for 5% of the mass of the catalyst). Stirring for 1 hour, with Na 2 CO 3 The pH of the solution was adjusted to 8.0, stirring was continued for 1 hour, and the temperature was cooled to room temperature. 0.15g NaBH 4 D...

Embodiment 2

[0045] Example 2Pd / Ni / g-C 3 N 4 Catalyst preparation

[0046] The catalyst preparation method of this embodiment is the same as that of Embodiment 1. The difference is that the active metal used is Pd (the active metal Pd accounts for 5% of the mass of the catalyst), and the obtained catalyst is recorded as Pd / NiCN.

Embodiment 3

[0047] Embodiment 3Pt-Pd / Ni / g-C 3 N 4 Catalyst preparation

[0048] The catalyst preparation method of this embodiment is the same as that of Embodiment 1. The difference is that the active metals used are Pt and Pd (the active metal Pt accounts for 2.5% of the catalyst mass, and the active metal Pd accounts for 2.5% of the catalyst mass), and the obtained catalyst is recorded as Pt-Pd / NiCN.

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Abstract

The invention relates to the technical field of catalytic hydrogenation, and particularly discloses a catalyst for continuous hydrogenation of aromatic nitro compounds and a preparation method. According to the catalyst, urea and nickel nitrate serve as raw materials, a Ni / g-C3N4 composite carrier is generated through a thermal polycondensation method, active precious metal is loaded, and the catalyst is obtained; wherein the active noble metal is one or a combination of more of Pt and Pd, and the active metal accounts for 5-10% of the mass of the catalyst. The active metal nanoparticles are uniformly distributed on the composite carrier. The catalyst disclosed by the invention is applied to continuous aromatic nitro compound hydrogenation reaction by adopting a micro-packed bed, heat and mass transfer in the reaction process can be further improved, full-automatic reaction is realized, the process is simple, the energy consumption is low, the cost is low, and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of catalytic hydrogenation, and specifically discloses a catalyst for continuous hydrogenation of aromatic nitro substances and a preparation method. Background technique [0002] The hydrogenation products of aromatic nitro compounds are widely used as chemical raw materials and are an important intermediate in organic synthesis. They are widely used in the synthesis of various fine chemical products in the fields of pesticides, medicines, dyes, and pigments. [0003] The industrial production of hydrogenation products of aromatic nitro compounds is mainly in the batch tank mode, which has the disadvantages of large equipment volume, difficult heat and mass transfer, complicated operation, and low production efficiency. Micro-packed bed reactor is an innovative process intensification technology that has developed rapidly in recent years. It is often used in continuous hydrogenation reactions. It has the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J35/10C07C309/46C07C303/32C07C209/36C07C211/46C07C211/52C07C211/51C07C213/02C07C217/84
Inventor 鄢冬茂司阳明卫星魏微纪璐张建军边策刘嵩龚党生
Owner SHENYANG RES INST OF CHEM IND
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