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One-step preparation type transition metal modified molecular sieve monolithic catalyst and method

A monolithic catalyst and transition metal technology, applied in molecular sieve catalysts, physical/chemical process catalysts, separation methods, etc., can solve problems that are not conducive to product quality consistency control, complex process, high production cost, etc., and achieve excellent low temperature activity and Hydrothermal stability, the effect of overcoming process problems

Inactive Publication Date: 2019-03-19
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-step process is complex and has many control points, which is not conducive to the control of product quality consistency, high production costs, and low production capacity

Method used

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  • One-step preparation type transition metal modified molecular sieve monolithic catalyst and method
  • One-step preparation type transition metal modified molecular sieve monolithic catalyst and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare 0.03mol / L copper sulfate solution, prepare the coating solution at the ratio of copper solution to H-SSZ-13 molecular sieve mass ratio of 18:1, adjust the pH to 4-5 and stir for 6h, add cerium nitrate (Ce The addition amount is calculated as 0.5% of the weight of the catalyst), stir evenly and add ethyl amine hydroxide to adjust the pH to 5-6. Grind the above slurry, control the particle size at 2.5μm-8μm, coat it on the cordierite carrier at a load of 150g / L, dry at 110°C, dry after the coating reaches the load, and fire at 650°C for 3h to make the whole CeO x / Cu molecular sieve catalyst, numbered as A. For comparison, the Cu-SSZ-13 powder material was first prepared by using the traditional ion exchange method and then coated to prepare the monolithic Cu-SSZ-13 catalyst numbered as B.

Embodiment 2

[0033] Prepare 0.03mol / L copper acetate and 0.005mol / L manganese nitrate mixed solution, prepare the coating solution according to the ratio of copper solution and SAPO-18 molecular sieve mass ratio of 18:1, adjust the pH to 4-5 and stir for 6h , Add cerium nitrate (the amount of Ce added is calculated as 0.2% of the weight of the catalyst), stir evenly and add ethyl ammonium hydroxide to adjust the pH to 5-6. Grind the above slurry to a particle size of 2.5μm-8μm, coat it on the cordierite carrier at a load of 160g / L, dry at 110°C, dry after the coating reaches the load, and fire at 550°C for 3h to obtain a powder Integral CeO x / Mn-Cu-SAPO-18 catalyst.

Embodiment 3

[0035] Prepare 0.14mol / L ferric nitrate solution and 0.005mol / L barium hydroxide mixed solution, add H-type beta molecular sieve according to the mass ratio of the mixed solution and molecular sieve of 2:1, adjust the pH to 4-5 and stir for 6h , Add ethyl amine hydroxide to adjust the pH to 5-6, add 5% silica according to the amount of molecular sieve. Grind the above slurry to control the particle size between 1.2μm-8μm, coat it on the cordierite carrier at a loading amount of 240g / L, dry at 160°C, dry after the coating reaches the loading amount, and calcinate at 650°C for 3h to prepare Fe / BaO-beta monolithic catalyst.

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PUM

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Abstract

The invention discloses a one-step preparation type transition metal modified molecular sieve monolithic catalyst and method. The preparation method includes four continuous processes including coating solution preparation, slurry preparation, catalyst coating and catalyst drying and calcining. The method is technically characterized in that after coating solution preparation, pulping and coatingprocesses are directly performed without steps of filtering, washing, drying and calcining. The process is simple, and the prepared molecular sieve monolithic catalyst is excellent in low-temperatureactivity and hydrothermal stability and applicable to nitrogen oxide (NOx) selective reduction and hydrocarbon (HC) low-temperature treatment and has a promising industrial application prospect.

Description

Technical field [0001] The invention relates to a one-step method for preparing a transition metal modified molecular sieve monolithic catalyst and a method. The prepared molecular sieve catalyst can be applied to diesel engine NO x Selective reduction and HC cryogenic treatment. Background technique [0002] NO x And HC are important pollutants of diesel engine exhaust. Where NO x It is the main cause of environmental problems such as acid rain, photochemical smog, and ozone layer voids, and has a significant impact on human health. HC has obvious irritation to the eyes and respiratory tract of the human body, and the hydrocarbons contain substances that cause human cancer. At this stage, the use of post-treatment catalysts can effectively reduce HC and NO in diesel exhaust x Emissions are currently the best post-treatment catalytic purification technology. [0003] In recent years, the use of catalyst tail gas purification technology has greatly reduced diesel engine HC and NO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/78B01J29/85B01D53/94B01D53/56B01D53/72
CPCB01D53/94B01D2257/402B01D2257/404B01D2257/702B01D2258/012B01J29/76B01J29/7615B01J29/7815B01J29/85Y02C20/10
Inventor 赖慧龙于飞常仕英杨冬霞贺小昆马江丽朱敬芳殷雪梅冯丰汪朝强
Owner 昆明贵研催化剂有限责任公司