Propane dehydrogenation catalyst with hetero atom molecule sieve as carrier and preparation method thereof

A heteroatom molecular sieve and propane dehydrogenation technology, which is applied in the direction of molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of short service life of catalysts, poor stability of catalytic reactions, and easy carbon deposition and deactivation of catalysts. Achieve high propane conversion rate and excellent anti-coking performance

Inactive Publication Date: 2009-08-26
NANJING JINLIAN TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

USP5192728 reported that ZSM or borosilicate was used as a carrier to prepare a catalyst suitable for dehydrogenation of low-carbon alkanes by supporting platinum group metal components, zinc components and magnesium components; USP4353815, USP4506032, USP4595673, ZL96115049. 1. ZL98114083.1 and CN101015802 mainly reported that γ-Al 2 o 3 Or molecular sieves are PtSn catalysts supported by carriers. Although these catalysts have high alkane conversion and olefin selectivity under certain reaction conditions, the stability of the catalytic reaction is poor due to the easy carbon deposition and deactivation of the catalyst under high temperature conditions. , the service life of the catalyst is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Through the hydrothermal synthesis method, the ZSM-5 molecular sieve (the content of Ce is 0.6wt%, the content of Sn is 0.8wt%) that the skeleton contains Ce, Sn is prepared, 80 ℃ with NH 4 The Cl aqueous solution was exchanged three times, washed with distilled water, dried at 80°C for 4 hours, calcined at 550°C for 5 hours, and cooled to obtain the heteroatom molecular sieve carrier. At 80°C, the heteroatom molecular sieve prepared above was impregnated with MgCl 2 Aqueous solution for 3 hours, filtered with suction, washed with distilled water, dried at 80°C for 3 hours, calcined at 500°C for 3 hours, and cooled to obtain a modified carrier. At 80 °C, impregnated with H 2 PtCl 6 and SnCl 4 The aqueous solution of 3h, after suction filtration, distilled water washing, 80 ℃ drying 3h, add 5wt% Al 2 o 3 Binder and 2wt% scallop powder, while adding 2wt% dilute HNO 3 Aqueous solution, extrusion molding. Then it was dried at 80°C for 3 hours, calcined in air at 500°...

Embodiment 2

[0030] A ZSM-5 molecular sieve (the La content is 0.6wt%, the Ce content is 0.3wt%, and the Sn content is 1.0wt%) is prepared by a hydrothermal synthesis method. NH at 80°C 4 The Cl aqueous solution was exchanged three times, washed with distilled water, dried at 80°C for 4 hours, calcined at 550°C for 5 hours, and cooled to obtain the heteroatom molecular sieve carrier. The molecular sieve was impregnated with KCl aqueous solution at 80°C for 3h, filtered with suction, washed with distilled water, dried at 80°C for 3h, then impregnated with H at 80°C 2 PtCl 6 and SnCl 4 The aqueous solution of 3h, after suction filtration, distilled water washing, 80 ℃ drying 3h, add 5wt% Al 2 o 3 Binder and 2wt% scallop powder, while adding 2wt% dilute HNO 3 Aqueous solution, extrusion molding. Then it was dried at 80°C for 3 hours, calcined in air at 500°C for 4 hours, and reduced in hydrogen at 500°C for 8 hours to obtain a reaction catalyst. The weight percent content of each compo...

Embodiment 3

[0033] By hydrothermal synthesis method, the ZSM-5 molecular sieve (La content is 1.2wt%, Sn content is 1.0wt%) with framework containing La and Sn is prepared, and NH 4 The Cl aqueous solution was exchanged three times, washed with distilled water, dried at 80°C for 4 hours, calcined at 550°C for 5 hours, and cooled to obtain the heteroatom molecular sieve carrier. At 80°C, the molecular sieve was first impregnated with NaCl aqueous solution for 3 hours, filtered with suction, washed with distilled water, dried at 80°C for 3 hours, and then impregnated with H at 80°C. 2 PtCl 6 and SnCl 2 The aqueous solution of 3h, after suction filtration, distilled water washing, 80 ℃ drying 3h, add 5wt% Al 2 o 3 Binder and 2wt% scallop powder, while adding 2wt% dilute HNO 3 Aqueous solution, extrusion molding. Then it was dried at 80°C for 3 hours, calcined in air at 500°C for 4 hours, and reduced in hydrogen at 500°C for 8 hours to obtain a reaction catalyst. The weight percent cont...

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PUM

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Abstract

The invention relates to a propane dehydrogenation catalyst with a hetero atom molecule sieve as a carrier. The hetero atom molecule sieve carrier for preparing the catalyst is a ZSM-5 molecule sieve with the skeleton containing metallic elements of the fourth A group and rare earth elements. The catalyst is shaped by taking metallic elements of platinum group as a main catalyst, taking metallic elements of the fourth A group or the metallic elements of the forth A group or the second A group as an assistant, taking halogen elements as a modifying agent, and taking inorganic oxides as a bonder. The preparation of the catalyst adopts a step impregnation method, that is, the method comprises the steps of firstly impregnating the alkaline metal assistant so as to effectively adjust the acidity and alkaline of the catalyst and the variety of positive ions in the pore path of the molecule sieve by cation interchange technology; and then impregnating the metallic elements of platinum group. The catalyst has excellent anti-carbon performance, and higher propane utilization rate, propane selectivity and reaction reliability at the reaction conditions of high temperature and low pressure.

Description

technical field [0001] The invention relates to a propane dehydrogenation catalyst with a heteroatom molecular sieve as a carrier and a preparation method thereof, which is suitable for gas-solid catalytic reaction and belongs to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] Propylene is an important organic chemical raw material. Propane dehydrogenation to propylene is an important way to realize the optimal utilization of low-carbon alkanes in refinery gas and oilfield associated gas, and has a good application prospect. The key to the application of this technology is to develop a dehydrogenation catalyst with high stability, high activity and high selectivity. USP5192728 reported that ZSM or borosilicate was used as a carrier to prepare a catalyst suitable for dehydrogenation of low-carbon alkanes by supporting platinum group metal components, zinc components and magnesium components; USP4353815, USP4506...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/40B01J23/58B01J23/62B01J23/44B01J29/40B01J37/10B01J37/02C07C5/333C07C11/06
CPCY02P20/52
Inventor 周钰明黄力李庆宁张一卫吴沛成刘宽田晓明张建国
Owner NANJING JINLIAN TECH
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