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Preparation method of catalyst

A catalyst and modifier technology, applied in the field of catalyst preparation, can solve the problems of difficult regeneration, unsatisfactory activity and catalytic life, and poor mechanical strength of activated carbon, and achieve the effects of increasing electron transfer, increasing electrochemical activity, and inhibiting reduction.

Inactive Publication Date: 2016-06-08
SHIHEZI UNIVERSITY
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Problems solved by technology

[0004] However, most of the research on catalysts choose activated carbon as the carrier. As we all know, activated carbon has the disadvantages of poor mechanical strength and not easy to regenerate. Therefore, whether new supports can be found to replace activated carbon as a carrier for the reaction of acetylene and hydrogen chloride has also aroused the researchers' attention. focus on
In recent years, SiO 2 、TiO 2 , γ-Al 2 o 3 and Y-type molecular sieves are used as carriers for the reaction of acetylene and hydrogen chloride, but the activity and catalytic life have not been ideal

Method used

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preparation example Construction

[0020] Catalyst preparation: Weigh 1.50g molecular sieve, stir with 0-0.5mL glacial acetic acid and 50-100mL deionized water for 10-60min to form a slurry solution; add a certain amount of modifier, hydrogen peroxide and deionized water dropwise in sequence, Stir under dark conditions for more than 24 hours. After the reaction is completed, the solution is filtered and dried, and calcined at a certain temperature in a nitrogen atmosphere. The calcined temperature is 600-1000°C to obtain a carrier. The preparation process does not require glacial acetic acid and hydrogen peroxide; using the equal volume impregnation method, disperse 1.5g of the carrier in deionized water for 10-30min ultrasonic treatment, then add the chloroauric acid aqueous solution dropwise into the carrier-dispersed mixture and continue ultrasonication for 10-30min , Stir at room temperature for 1-3h, let stand for more than 24h, and finally dry overnight. The ratio of the mass of the gold element in the ca...

Embodiment 1

[0023] With reference to the preparation method of the above-mentioned catalyst and the test method for the evaluation of the reactivity of acetylene and hydrogen chloride, the preparation of the catalyst and the evaluation of its catalytic activity were carried out. The test parameters such as the type, the type of modifier, the mass ratio of the modifier and the molecular sieve are shown in Table 1, the characterization of the prepared catalyst is shown in Table 2, and the conversion rate of acetylene is shown in Table 3.

Embodiment 2

[0025] Carry out the preparation of catalyst and the evaluation of catalytic activity with reference to the preparation method of above-mentioned catalyst and acetylene and hydrogen chloride reactivity evaluation test method, the ratio of the quality of gold element in the catalyst and the mass of carrier is 0.5 in the present embodiment, the molecular sieve used in the present embodiment The test parameters such as the type, the type of modifier, the mass ratio of the modifier and the molecular sieve are shown in Table 1, the characterization of the prepared catalyst is shown in Table 2, and the conversion rate of acetylene is shown in Table 3.

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Abstract

The invention relates to a preparation method of a catalyst. The preparation method includes the steps that glacial acetic acid, a molecular sieve and deionized water are mixed and stirred; a modification agent, hydrogen peroxide and deionized water are added and stirred, the modification agent is carbon and nitrogen compounds, and carriers are prepared through filtering, drying and sintering; the prepared carriers are dispersed in deionized water through an isometric immersion method, and ultrasonic treatment is performed; a chloroauric acid aqueous solution is added, and ultrasonic treatment, stirring, standing and drying are performed. The method that the catalyst is used for catalyzing the synthetic reaction of acetylene and hydrogen chloride includes the steps that the catalyst is placed into a tubular fixed bed reactor, hydrogen chloride is introduced for activating, and the activating temperature is 100-300 DEG C; reaction raw material gas of hydrogen chloride and acetylene are introduced, the volume ratio of hydrogen chloride to acetylene is 0.8-1.5, reaction temperature is 100-300 DEG C, and the volume airspeed of the reaction is 20-360h<-1>. The catalytic activity of the catalyst prepared through the method in the synthetic reaction of acetylene and hydrogen chloride is remarkably enhanced compared with that of a conventional molecular sieve catalyst, and the service life of the catalyst is remarkably prolonged.

Description

technical field [0001] The invention relates to a catalyst, in particular to a preparation method of the catalyst. Background technique [0002] As the most important and commonly used product in the plastics industry, polyvinyl chloride (PVC) is one of the most widely used materials in the world today. It plays an important role in my country's national economic and social development, and its demand is worldwide. is also increasing. Vinyl chloride monomer (VCM) is one of the important raw materials for the synthesis of polyvinyl chloride (PVC). The production methods of VCM mainly include ethylene process, ethane process and acetylene process. Because of the characteristics of "gas", the synthesis of VCM in my country mainly adopts the acetylene method. Today, the reaction of acetylene and hydrogen chloride is widely used in industry to synthesize vinyl chloride, and HgCl 2 As the catalytically active component, activated carbon is used as the carrier. It is well known t...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J29/03C07C17/08C07C21/06
CPCB01J29/44B01J29/0325B01J2229/30C07C17/08
Inventor 代斌刘慧捷朱明远于锋
Owner SHIHEZI UNIVERSITY
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