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Cyanamide compound-Pt-based nanocrystalline catalyst as well as preparation method and application thereof

A nanocrystal and compound technology, which is applied in the field of cyanamide compound-Pt-based nanocrystal catalyst and its preparation, can solve the problems of difficult separation of inhibitors, loss of catalyst activity, complex reaction system, etc., and achieves uniform morphology and influence on activity. The effect of small size and simple preparation process

Active Publication Date: 2020-12-22
厦门嘉氢科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology provides technical benefits that include improved efficiency and reduced costs compared to existing methods used during manufacturing processes or operations. It also allows for better control over specific types of chemicals being produced due to its unique structure and performance characteristics. Additionally, it simplifies the overall procedure involved while maintaining consistency across different stages of processing.

Problems solved by technology

Technological Problem: Current methods used to reduce halobenzene (BZ) are complex processes involving multiple steps such as reducing bromophenol or oxidizing chlorination compounds, leading to reduced yields and purity of desired products. Additionally, current methods require expensive chemical agents like DCCP or other strong acids during decomposition stages, causing metal contamination issues.

Method used

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  • Cyanamide compound-Pt-based nanocrystalline catalyst as well as preparation method and application thereof
  • Cyanamide compound-Pt-based nanocrystalline catalyst as well as preparation method and application thereof
  • Cyanamide compound-Pt-based nanocrystalline catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of Dicyandiamide-Pt-Based Nanocrystalline Catalyst (The molar ratio of dicyandiamide to Pt-based nanocrystals is 1:1)

[0035] According to the method provided by the present invention, get clean Pt-based nanocrystals and disperse them in ethanol solution, and add Dicyandiamide solution was modified at 80° C. for 8 hours. The modified catalyst obtained in this example was dicyandiamide-Pt-based nanocrystalline catalyst (1:1).

[0036] Hydrogenation Catalytic Efficiency

[0037] The performance evaluation of the catalyst prepared in this example was carried out. Add 1mmol of 4-nitrochlorobenzene, 0.5mg of the dicyandiamide-Pt-based nanocrystalline catalyst (1:1) of Example 1 and 10mL of absolute ethanol into the reactor in sequence, and feed nitrogen into the reactor for 3 consecutive replacements Air in the reaction kettle, then feed hydrogen into the reaction kettle, start stirring when the pressure in the kettle is 0.1MPa, the rotation speed is 750rp...

Embodiment 2

[0039] Preparation of cyanamide-Pt-based nanocrystalline catalyst and its hydrogenation catalytic efficiency (The molar ratio of cyanamide to Pt-based nanocrystals is 1:1)

[0040] This example adopts the preparation reaction conditions similar to Example 1, and the only difference from Example 1 is that the cyanamide compound used in the reaction is cyanamide, and the modified catalyst obtained in this example is cyanamide-Pt based Nanocrystalline catalyst (1:1). The catalytic reaction conditions of this embodiment are also the same as that of Example 1.

Embodiment 3

[0042] Preparation of melamine-Pt-based nanocrystalline catalyst and its hydrogenation catalytic efficiency (The molar ratio of melamine to Pt-based nanocrystals is 1:1)

[0043] This embodiment adopts the preparation reaction conditions similar to Example 1, and the only difference from Example 1 is that the cyanamide compound used in the reaction is melamine, and the modified catalyst obtained in this embodiment is a melamine-Pt-based nanocrystalline catalyst ( 1:1). The catalytic reaction conditions of this embodiment are also the same as that of Embodiment 1.

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Abstract

The invention provides a preparation method of a cyanamide compound-Pt-based nanocrystalline catalyst, wherein the preparation method comprises the steps: dispersing Pt-based nanocrystalline in an alcoholic solution, and adding a cyanamide compound for modification according to the molar ratio of the cyanamide compound to the Pt-based nanocrystalline of 1:1-5:1 to obtain the cyanamide compound modified Pt-based nanocrystalline catalyst, wherein the crystal structure of the Pt-based nanocrystalline is a cube composed of six Pt (100) crystal faces. The preparation method is simple in process, and in the catalytic process, the adopted Pt-based nanocrystalline only needs an extremely small amount of cyanamide compound for modification to achieve extremely high catalytic selectivity, so that the prepared product is extremely high in purity, free of additive pollution and suitable for long-term production and operation in the hydrogenation process.

Description

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Claims

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Application Information

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Owner 厦门嘉氢科技有限公司
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