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Preparation method of phosphorus modified multistage pore ZSM-5 zeolite

A ZSM-5, multi-level pore technology, applied in the field of inorganic material synthesis and catalysis, to achieve the effects of enhancing hydrothermal stability, improving selectivity, and simple modification methods

Inactive Publication Date: 2017-02-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant research on how to control the surface acidity of hierarchically porous zeolites.

Method used

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  • Preparation method of phosphorus modified multistage pore ZSM-5 zeolite
  • Preparation method of phosphorus modified multistage pore ZSM-5 zeolite
  • Preparation method of phosphorus modified multistage pore ZSM-5 zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a) Add 1 g of hierarchically porous ZSM-5 zeolite to 10 ml of phosphoric acid solution containing 0.01 g of phosphorus, and stir at room temperature for 2 h to disperse it evenly;

[0043] b) rotating the mixture obtained in step a) at 80° C. for 2 h;

[0044] c) drying the dried powder obtained in step b) in an oven at 120° C. for 2 hours;

[0045] d) Remove the sample from the oven. Calcining in a muffle furnace at 600° C. for 4 h with a heating rate of 2° C. / min to obtain a phosphorus-modified hierarchically porous ZSM-5 zeolite with a phosphorus modification amount of 1 wt%.

[0046] figure 1 This is the XRD pattern of the phosphorus-modified hierarchically porous ZSM-5 zeolite prepared in Example 1. It can be seen from the figure that the material has a typical MFI zeolite structure with a very high crystallinity.

[0047] figure 2It is the nitrogen adsorption-desorption isotherm (a) and pore size distribution figure (b) of the phosphorus-modified multi-stage ...

Embodiment 2

[0052] The difference between this example and Example 1 is only that the mass of phosphorus contained in the solution is 3% of the mass of the hierarchically porous ZSM-5 zeolite, and the rest of the content is the same as in Example 1.

[0053] Figure 5 It is the XRD diffraction pattern and the nitrogen adsorption-desorption isotherm of the phosphorus-modified hierarchically porous ZSM-5 zeolite prepared in Example 2. It can be seen from the figure that the material is a typical MFI zeolite structure with very high crystallinity. Moreover, the nitrogen adsorption-desorption isotherm is a typical IV-type isotherm and H1-type hysteresis loop, at 0.60 <0.9 There is an obvious breakthrough in adsorption, indicating the existence of mesoporous structure.

[0054] Image 6 SEM and TEM photographs of the phosphorus-modified hierarchically porous ZSM-5 zeolite prepared in Example 2, we can find from the SEM image that the material is nano-spherical particles. Its rough surface h...

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Abstract

The invention relates to a preparation method of a phosphorus modified multistage pore ZSM-5 zeolite. The preparation method comprises following steps: multistage pore ZSM-5 zeolite is subjected to dipping in a solution containing a phosphorus source, is subjected to rotary evaporation for 0.5 to 12h at 60 to 120 DEG C, drying, and calcination so as to obtain the phosphorus modified multistage pore ZSM-5 zeolite. The improvement technology of the preparation method is capable of improving hydrothermal stability of the phosphorus modified multistage pore ZSM-5 zeolite effectively, and adjusting the acid properties of the phosphorus modified multistage pore ZSM-5 zeolite, so that the obtained phosphorus modified multistage pore ZSM-5 zeolite is suitable for butylene cracking reaction, and propylene selectivity is increased.

Description

technical field [0001] The invention belongs to the field of synthesis and catalysis of inorganic materials, and in particular relates to a post-modification method for hierarchically porous ZSM-5 zeolite. Background technique [0002] Low-carbon olefins (especially propylene) are important basic chemical raw materials, and the amount of propylene consumed in industry is increasing rapidly every year. The traditional industry mainly produces propylene through steam cracking of naphtha. However, this production method consumes a lot of energy (generally the reaction temperature is higher than 800° C.), the yield is low (generally lower than 13%), and a large amount of CO will be emitted. 2 . Therefore, an efficient and green method to produce propylene is urgently needed in industry. [0003] The catalytic cracking of butene to propylene has attracted extensive attention of researchers in recent years. Because the reaction temperature of this method is low (generally lowe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
CPCC01B39/38C01B39/026C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2006/12C01P2006/14C01P2006/16C01P2006/17
Inventor 吕健华子乐施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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