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Catalyst as well as preparation method and application thereof

A catalyst and modification technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as the inability to achieve benzene conversion, cyclohexylbenzene selectivity, cyclohexylbenzene yield reduction, etc.

Pending Publication Date: 2022-05-27
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the catalytic alkylation reaction in the prior art can lead to a reduction in the yield of cyclohexylbenzene while increasing the conversion rate, that is, the simultaneous improvement of the benzene conversion rate and the selectivity of cyclohexylbenzene cannot be realized.

Method used

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  • Catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0042] The present invention also provides the preparation method of the catalyst described in the above technical solution, comprising the following steps:

[0043] The modified molecular sieve is loaded in a mixed solution of soluble noble metal salt and soluble transition metal salt to obtain a precursor;

[0044] The precursor is calcined to obtain the catalyst.

[0045] In the present invention, unless otherwise specified, all preparation raw materials are commercially available products well known to those skilled in the art.

[0046] In the present invention, the modified molecular sieve is placed in a mixed solution of a soluble noble metal salt and a soluble transition metal salt for loading to obtain a precursor.

[0047] In the present invention, the loading is specifically after mixing soluble noble metal salt, soluble transition metal salt, polyvinylpyrrolidone and water, adding the modified molecular sieve, and finally adding urea to carry out a hydrothermal rea...

Embodiment 1

[0060] First, 4g of ammonium-type Y-type molecular sieve (SiO 2 / Al 2 O 3 =5) vacuum drying at 100°C for 4h; then placed in a quartz fixed bed reactor, and a mixed gas of water vapor and air (volume concentration of water vapor is 10%) was introduced at 300°C, and the flow rate of the mixed gas was 200mL / min, After steam treatment for 2h, switch to pure N 2 , the sample was purged to room temperature at a flow rate of 200 mL / min to obtain a modified hydrogen type Y molecular sieve (denoted as HY-300-2-200);

[0061] 0.99g NiCl 2 ·6H 2 O. 8×10 -4 g PdCl 2 , 0.28g of polyvinylpyrrolidone (PVP) and 30g of deionized water were mixed, 2g of the modified hydrogen-type Y-type molecular sieve was added, and finally 2.58g of urea was added. , followed by solid-liquid separation, washing and drying to obtain a precursor;

[0062] The precursor is calcined, and the calcination process is to raise the temperature to 500°C at a heating rate of 2°C / min, and then keep the temperature...

Embodiment 2

[0064] Referring to Example 1, the only difference is that the temperature of the steam treatment is 500° C., and the obtained modified hydrogen type Y-type molecular sieve (denoted as HY-500-2-200).

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Abstract

The invention relates to the technical field of catalysts, in particular to a catalyst and a preparation method and application thereof. The catalyst provided by the invention comprises a carrier and an active component, the active component comprises precious metal and transition metal; the carrier is a modified molecular sieve, and the modified molecular sieve is a modified hydrogen type molecular sieve; the modified molecular sieve is obtained by performing water vapor treatment on a molecular sieve. The acid property of the molecular sieve can be modulated through water vapor treatment, the alkylation function of the catalyst is further enhanced, the catalytic activity of the reaction is improved, and the conversion rate and selectivity of cyclohexylbenzene prepared through the benzene hydroalkylation reaction are improved.

Description

technical field [0001] The present invention relates to the technical field of catalysts, in particular to a catalyst and a preparation method and application thereof. Background technique [0002] Cyclohexylbenzene is an important fine chemical product and organic intermediate, which is widely used in production and life. Cyclohexylbenzene can be used as an anti-overcharge protective agent for lithium ion battery electrolyte to improve the safety performance of the battery or as a diesel additive to improve the cetane number, and can also be used as a liquid crystal display material. Cyclohexylbenzene can also be used as an important organic intermediate to prepare phenol and cyclohexanone through peroxidation reaction to solve the problem of excess acetone by-product in the process of preparing phenol by cumene method. [0003] At present, the process methods for synthesizing cyclohexylbenzene mainly include alkylation (alkylation reaction of benzene hydrogenation or alky...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/14C07C2/74C07C13/28
CPCB01J29/146C07C2/74B01J2229/16B01J2229/18C07C2601/14C07C13/28Y02P20/52
Inventor 陈秉辉赖志蓉张诺伟谢建榕叶松寿蔡钒郑进保
Owner XIAMEN UNIV
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