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High-stability and high-selectivity platinum-carbon catalyst and preparation method thereof

A platinum-carbon catalyst, high-stability technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of many by-products, catalyst deactivation, low yield, etc., and achieve good stability , high activity, good selectivity

Active Publication Date: 2022-07-29
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Homogeneous catalyst precious metals cannot be used repeatedly; heterogeneous carbon-supported citral selective hydrogenation can be recycled and used, but there are also the following difficulties. Difficulty 1: There are two C=C double bonds and one C=C in the citral molecule. O double bond, all three double bonds can be hydrogenated; Difficulty 2: C=C double bond can not only be hydrogenated, but under high temperature conditions, there is usually polymerization, covering the surface of the catalyst, causing catalyst deactivation; Difficulty 3: Many by-products , menthol, citronellol and acetal products often appear in the hydrogenation product of citral, and the yield is very low, therefore, provide a kind of high stability and high selectivity for the hydrogenation of citral to prepare geraniol and nerol Catalysts are crucial

Method used

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  • High-stability and high-selectivity platinum-carbon catalyst and preparation method thereof
  • High-stability and high-selectivity platinum-carbon catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] A preparation method of a platinum-carbon catalyst with high stability and selectivity, comprising the following steps:

[0022] Step S1, taking 2mol of formaldehyde and adding 60mL of deionized water to form a solution, adding 0.5mol / L NaOH solution dropwise to the solution to adjust the pH of the solution to 10, adding 8mol melamine and 0.1mol / L chloroplatinum Acid solution, stir until completely dissolved;

[0023] In step S2, the round-bottomed flask containing the medicine of step S1 is placed in a water bath for heating, the temperature is raised to 50° C. for reflux, and the melamine is dissolved to obtain a transparent mixed solution, and the stirring is continued for 0.5 h;

[0024] In step S3, 10 mL of methanol solution was added, the pH value of the solution was adjusted to 5 with HCl with a concentration of 1 mol / L, and the temperature was raised to 70 °C and refluxed for 2 h;

[0025] In step S4, the obtained sample is vacuum-dried at 60 °C, and placed in ...

Embodiment 2

[0028] A preparation method of a platinum-carbon catalyst with high stability and selectivity, comprising the following steps:

[0029] Step S1, get 2mol formaldehyde and add 60mL of deionized water to form a solution, in the solution, drip the NaOH solution that concentration is 0.5mol / L to adjust the pH value of the solution to 10, and add 8mol of melamine and concentration of 0.1mol / L. Sodium Hydroxyplatinate solution, stir until completely dissolved;

[0030] In step S2, the round-bottomed flask containing the medicine in step S1 is placed in a water bath and heated, and the temperature is raised to 50°C for reflux, and the melamine is dissolved to obtain a transparent mixed solution and continue to stir for 0.5h;

[0031] In step S3, 10 mL of methanol solution was added, the pH of the solution was adjusted to 5 with HCl with a concentration of 1 mol / L, and the temperature was raised to 70 °C and refluxed for 2 h;

[0032] In step S4, the obtained sample is vacuum-dried a...

Embodiment 3

[0035] A preparation method of a platinum-carbon catalyst with high stability and selectivity, comprising the following steps:

[0036] Step S1, take 2mol of formaldehyde and add 60mL of deionized water to form a solution, add 0.5mol / L NaOH solution dropwise to the solution to adjust the pH of the solution to 10, add 8mol of melamine and 0.01mol / L of chlorine Platinum acid solution, stirring until completely dissolved;

[0037] In step S2, the round-bottomed flask containing the medicine in step S1 is placed in a water bath for heating, the temperature is raised to 50° C. for reflux, and the melamine is dissolved to obtain a transparent mixed solution, and the stirring is continued for 0.5 h;

[0038] In step S3, 10 mL of methanol solution was added, the pH value of the solution was adjusted to 5 with HCl with a concentration of 1 mol / L, the temperature was raised to 70 °C, and the reflux was continued for 2 h;

[0039] In step S4, the obtained sample is vacuum-dried at 60 °C...

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Abstract

The invention relates to a high-stability and high-selectivity platinum-carbon catalyst and a preparation method thereof.The preparation method comprises the following steps that formaldehyde is added into deionized water, the pH value of the solution is adjusted to 7.5-14, and melamine and a platinum precursor solution are added; heating the medicines, raising the temperature to 50-100 DEG C, refluxing to obtain a transparent mixed solution, and continuously stirring; adding an alcoholic solution into the solution, adjusting the pH value of the solution to 1-10, heating to 50-100 DEG C, and continuing reflux for 2 hours; carrying out vacuum drying on the obtained sample at 40-60 DEG C, roasting the dried sample in a tubular furnace at 400-600 DEG C for 2 hours, heating to 600-1200 DEG C, roasting for 2 hours, and cooling to room temperature; and washing the obtained sample to be neutral, carrying out vacuum drying at 60-100 DEG C for 10 hours, and carrying out ball milling to obtain platinum-carbon catalyst powder. The platinum-carbon catalyst prepared by the invention has high selectivity when citral is hydrogenated to prepare geraniol and nerol, has higher stability, and still has better selectivity and catalytic effect after being repeatedly used for 20 times.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalyst preparation, and in particular relates to a platinum-carbon catalyst with high stability and high selectivity and a preparation method thereof. Background technique [0002] Geraniol and nerol are indispensable ingredients in all kinds of flavors, the main agents of rose-based flavors; they are also sweeteners, and are also used in the preparation of food, soap, and daily cosmetics. At the same time, geraniol and nerol are the raw materials for the manufacture of vanillyl alcohol, vanillin, citral, hydroxyvanillin, ionone and vitamin A; various esters synthesized from geraniol are also good spices. [0003] Geraniol is used as medicine for antibacterial and deworming; clinical treatment of chronic bronchitis has a good effect, not only can it improve lung ventilation function and reduce airway resistance, but also it is beneficial to improve immune function of the body, and it is effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C29/141C07C33/02
CPCB01J27/24C07C29/141B01J35/396C07C33/02
Inventor 饶超李新华蒋颉刘洋刘鹏鹏倪蓓王敏张云贾莉伟王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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