Precious metal loaded ZSM-5 molecular sieve, and preparation method and application thereof

A ZSM-5, precious metal technology is applied in the field of precious metal supported ZSM-5 molecular sieve and its preparation, and achieves the effects of simple preparation method, omission of roasting and simplified preparation process

Inactive Publication Date: 2017-05-31
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
View PDF6 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet the molecular sieve of this invention can o...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Precious metal loaded ZSM-5 molecular sieve, and preparation method and application thereof
  • Precious metal loaded ZSM-5 molecular sieve, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In the present invention, the in-situ synthesis of Pd-loaded ZSM-5 molecular sieves by the following method specifically includes the following steps:

[0054] (1) In a 200mL beaker, add 0.066g of sodium metaaluminate, 41.5g of deionized water, 24.5mL of tetra-n-propylammonium hydroxide (19.42%) and 15.6mL of palladium nitrate aqueous solution (1.4998×10 -3 g / ml), stirred at 25°C for 15min;

[0055] (2) Add 17.75 mL tetraethyl orthosilicate to the mixture obtained in step (1), and stir and mix at 25° C. for 5 h;

[0056] (3) The mixture obtained in step (2) was crystallized at 180° C. for 4 days in a reactor to obtain crystals, which were washed and dried to obtain Pd-loaded ZSM-5 molecular sieves.

Embodiment 2

[0058] In the present invention, in-situ synthesis of noble metal-supported ZSM-5 molecular sieves by the following method specifically includes the following steps:

[0059] (1) In a 200mL beaker, add 0.066g sodium metaaluminate, 13.2g deionized water, 13.5mL tetra-n-propylammonium hydroxide solution (concentration 15%) and 15mL palladium nitrate aqueous solution (2×10 -3 g / mL) was stirred and mixed for 30min at 20°C;

[0060] (2) Add 7 mL tetraethyl orthosilicate to the mixture obtained in step (1), and stir and mix at 20° C. for 10 h;

[0061] (3) The mixture obtained in step (2) was crystallized at 150° C. in a reaction kettle for 8 days to obtain a crystal, which was washed and dried to obtain a Pd-loaded ZSM-5 molecular sieve.

Embodiment 3

[0063] In the present invention, in-situ synthesis of noble metal-supported ZSM-5 molecular sieves by the following method specifically includes the following steps:

[0064] (1) In a 200mL beaker, add 0.066g of sodium metaaluminate, 52.8g of deionized water, 26.5mL of tetra-n-propylammonium hydroxide solution (concentration 25%) and 19.5mL of palladium nitrate aqueous solution (1×10 -3 g / mL) was stirred and mixed for 5 min at 30°C;

[0065] (2) Add 20 mL tetraethyl orthosilicate to the mixture obtained in step (1), and stir and mix at 35° C. for 3 h;

[0066] (3) The mixture obtained in step (2) was crystallized at 200° C. for 1 day in a reactor to obtain a crystal, which was washed and dried to obtain a Pd-loaded ZSM-5 molecular sieve.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for in-situ synthesizing a precious metal loaded ZSM-5 molecular sieve. The method is characterized by comprising the following steps of stirring and mixing an aluminum source, water, a template agent solution and a precious metal saline solution; adding a silicon source, and stirring and mixing; crystallizing a mixture in a reaction kettle to obtain a crystal substance, and cleaning and drying to obtain the precious metal loaded ZSM-5 molecular sieve. The preparation method provided by the invention is simple, a preparation process of a traditional zeolite molecular sieve loaded precious metal catalyst is simplified, the steps of roasting and H2 reducing are saved, the operation cost is reduced, and the catalytic efficiency of the prepared molecular sieve on ortho-xylene is remarkably superior to the precious metal loaded ZSM-5 molecular sieve prepared through a traditional impregnation method.

Description

technical field [0001] This field belongs to the field of catalysts, and relates to a noble metal-loaded ZSM-5 molecular sieve and its preparation method and application. Background technique [0002] Volatile organic compounds (Volatile Organic Compounds, VOCs) are one of the important components of air pollutants, which pose serious hazards to the environment and human health. Therefore, it is of great environmental significance to effectively eliminate VOCs pollution. Among the many ways to eliminate VOCs, the catalytic oxidation method is the most practical control technology, and the noble metal Pd is one of the commonly used catalyst active components due to its good low-temperature activity and selectivity. Zeolite molecular sieves are widely used in the fields of gas separation, adsorption and catalysis due to their large specific surface area, regular, orderly and intertwined pores, large adsorption capacity and high hydrothermal stability. Since the preparation pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B39/40B01J29/44
CPCC01B39/40B01J29/44C01P2002/72
Inventor 贺泓胡凌霄张长斌王莲张博王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap