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PtIn-coated MFI catalyst as well as preparation method and application thereof

A catalyst, pt-in technology, applied in the field of PtIn@MFI catalyst and its preparation, can solve the problems of easy coking and deactivation, high price, unfriendly environment, etc., achieve high catalytic activity and stability, less equipment, and easy-to-use products Effect

Active Publication Date: 2021-06-29
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, due to changes in the energy structure, the production of propylene has been increasingly unable to meet market demand, and direct propane dehydrogenation technology has become one of the main means of producing propylene
The traditional propane dehydrogenation catalyst is CrO x and Pt-based catalysts, despite their high dehydrogenation activity, CrO x Pt-based catalysts are not environmentally friendly, while Pt-based catalysts are expensive, and both are prone to coking and deactivation

Method used

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  • PtIn-coated MFI catalyst as well as preparation method and application thereof
  • PtIn-coated MFI catalyst as well as preparation method and application thereof
  • PtIn-coated MFI catalyst as well as preparation method and application thereof

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preparation example Construction

[0035] The present invention provides a method for preparing the PtIn@MFI catalyst described in the above technical solution, comprising:

[0036] Pt(NH 3 ) 4 (NO 3 ) 2 (tetraammineplatinum nitrate) aqueous solution and TPAOH (tetrapropyl ammonium hydroxide) solution are mixed to obtain the first mixed solution;

[0037] TEOS (tetraethyl orthosilicate) is mixed with the first mixed solution to obtain the second mixed solution;

[0038] Will In(NO 3 ) 3 ·xH 2 O (indium nitrate hydrate) solution is mixed with the second mixed solution to obtain the third mixed solution;

[0039] subjecting the third mixed solution to hydrothermal treatment to obtain a treated product;

[0040] The processed product is calcined to obtain a PtIn@MFI catalyst.

[0041] In the present invention, during the preparation of the PtIn@MFI catalyst, SiO 2 , TPAOH, H 2 The molar ratio of O, Pt and In is preferably 1:(0.3~0.5):(30~50):(0.001~0.009):(0.001~0.009), more preferably 1:(0.35~0.45):(35...

Embodiment 1

[0073] The preparation of the Pt-In nano-catalyst encapsulated in the MFI molecular sieve of embodiment 1

[0074] 0.27g of In(NO 3 ) 3 ·xH 2 O was dispersed in 10mL of deionized water, stirred at room temperature to form solution A; 13g of TPAOH (mass fraction 25%) was dispersed in 16.5g of deionized water, stirred evenly; then 0.8mL of 0.000225mol / mL of Pt(NH 3 ) 4 (NO 3 ) 2 Aqueous solution, stirred in a water bath at 35°C for 10 minutes; then added 8.32 g of TEOS to it, stirred in a water bath at 35°C for 20 minutes to form solution D; took 1 mL of solution A and added to solution D, stirred in a water bath at 35°C for 9 hours to form a solution E: Transfer the solution E to a hydrothermal kettle for hydrothermal treatment at 180°C for 96 hours.

[0075] The hydrothermally treated product was washed three times by centrifugation with deionized water at a speed of 10,000 rpm for 5 minutes; then dried at 70°C for 12 hours; finally calcined in an air atmosphere at a ca...

Embodiment 2

[0079] The preparation of the Pt-In nano-catalyst encapsulated in the MFI molecular sieve of embodiment 2

[0080] 0.27g of In(NO 3 ) 3 ·xH 2 O was dispersed in 10mL deionized water, and stirred at room temperature to form solution A; 13g of TPAOH (mass fraction 25%) was dispersed in 15.5g of deionized water, stirred evenly; then 0.8mL of 0.000225mol / mL of Pt (NH 3 ) 4 (NO 3 ) 2 Aqueous solution, stirred in a 35°C water bath for 10min; then added 8.32g of TEOS to it, stirred in a 35°C water bath for 20min to form solution D; took 2mL of solution A and added it to solution D, stirred in a 35°C water bath for 9h to form a solution E: Transfer the solution E to a hydrothermal kettle for hydrothermal treatment at 180°C for 96 hours.

[0081] The product after hydrothermal treatment was centrifugally washed with deionized water at a speed of 10,000 rpm for 5 minutes; then dried at 70°C for 12 hours; and finally calcined at a temperature of 550°C for 4 hours in an air atmosph...

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Abstract

The invention provides a PtIn-coated MFI catalyst. The PtIn-coated MFI catalyst comprises an MFI molecular sieve framework; and the Pt-In nanoparticles are uniformly coated in the pore channels. The invention provides a preparation method of a PtIn-coated MFI catalyst. The preparation method comprises the following steps: mixing a silicon source, a template agent, an indium source and a platinum source to form a solution; and carrying out hydrothermal treatment on the mixed solution in a hydrothermal kettle, and then cooling, centrifuging, washing, drying and roasting. According to the preparation method of the catalyst provided by the invention, a heterogeneous structure is realized, so that the catalyst is easily separated and collected from a reaction system, and on the basis of the interaction among different metal elements and the molecular sieve, when the catalyst is subjected to a propane direct dehydrogenation reaction in a fixed bed, and the catalyst has high stability while maintaining high conversion rate and high selectivity. The invention also provides an application of the PtIn-coated MFI catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a PtIn@MFI catalyst and its preparation method and application. Background technique [0002] In recent years, due to changes in the energy structure, the production of propylene has been increasingly unable to meet market demand, and direct propane dehydrogenation technology has become one of the main means of producing propylene. The traditional propane dehydrogenation catalyst is CrO x and Pt-based catalysts, despite their high dehydrogenation activity, CrO x Pt-based catalysts are not environmentally friendly, while Pt-based catalysts are expensive, and both are prone to coking and deactivation. Therefore, while improving and enhancing the performance of traditional catalysts, the development of new catalysts for propane dehydrogenation with high activity, high selectivity and high stability has become a hot spot in recent years. Contents of the invention [0003] In v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74C07C5/333C07C11/06
CPCB01J29/74C07C5/3337B01J2229/186C07C2529/74C07C11/06Y02P20/52
Inventor 罗雷李旭周涛李文杰曾泽昆鲍骏曾杰
Owner UNIV OF SCI & TECH OF CHINA
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