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Binder-free zsm-5 molecular sieve catalyst and its preparation and use method

A ZSM-5, binder-free technology, applied in the field of molecular sieve catalysts, can solve the problems of reduced catalytic activity and reduced utilization of molecular sieve channels, and achieve the effects of increased yield, improved catalytic cracking effect, and low methane yield

Active Publication Date: 2015-10-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a binder-free molecular sieve catalyst and its preparation method and application in order to solve the technical problem that the utilization rate of molecular sieve pores is reduced due to the addition of a binder during the molding process of the molecular sieve, thereby reducing the catalytic activity.

Method used

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  • Binder-free zsm-5 molecular sieve catalyst and its preparation and use method
  • Binder-free zsm-5 molecular sieve catalyst and its preparation and use method
  • Binder-free zsm-5 molecular sieve catalyst and its preparation and use method

Examples

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Embodiment 1

[0031] Mix ZSM-5 molecular sieve with a silicon-aluminum molar ratio of 50 and powdered silica 3:1 (weight ratio) evenly, add a solution containing phosphorus and lanthanum, and stir evenly. Knead and extrude into strips and let dry. Put it into the crystallization kettle, the mixture of 10 grams of triethylamine and 10 grams of water has been in the crystallization kettle, and there is a mesh metal object to isolate the liquid from direct contact with the strip. Stand at 180°C for 96 hours. Take it out, wash it with distilled water, dry it in the air, and bake it at 580°C. Sampling, pulverization and characterization. In the shaped catalyst, the weight content of phosphorus element is 1.25%, and that of lanthanum element is 0.67%. XRD characterization results show that (see figure 1 ), ZSM-5 crystal phase structure, and high crystallinity. In addition, at 22~28°, compared with the untransformed catalyst strip, it can be seen that the content of amorphous silica is signif...

Embodiment 2

[0036] Mix ZSM-5 molecular sieve with a silicon-aluminum molar ratio of 200 and powdered silicon dioxide 4:1 (weight ratio) evenly, add a solution containing phosphorus and lanthanum, and stir evenly. Knead and extrude into strips and let dry. Put it into the crystallization kettle, the mixture of 10 grams of triethylamine and 10 grams of water has been in the crystallization kettle, and there is a mesh metal object to isolate the liquid from direct contact with the strip. Place at 180°C for 48 hours. Take it out, wash it with distilled water, dry it in the air, and bake it at 580°C. In the shaped catalyst, the weight content of phosphorus element is 1.35%, and that of lanthanum element is 0.52%. Catalyst treatment and reaction conditions are the same as in Example 1, and the results are shown in Table 2.

Embodiment 3

[0038] Mix ZSM-5 molecular sieve with a silicon-aluminum molar ratio of 350 and powdered silica 5:1 (weight ratio), add a solution containing phosphorus and lanthanum, and stir evenly. Knead and extrude into strips and let dry. Put it into the crystallization kettle, the mixture of 10 grams of triethylamine and 10 grams of water has been in the crystallization kettle, and there is a mesh metal object to isolate the liquid from direct contact with the strip. Stand at 180°C for 150 hours. Take it out, wash it with distilled water, dry it in the air, and bake it at 580°C. In the shaped catalyst, the phosphorus element weight content is 1.18%, and the lanthanum element is 0.60%. Catalyst treatment and reaction conditions are the same as in Example 1, and the results are shown in Table 2.

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Abstract

The invention relates to a binder-free ZSM-5 molecular sieve catalyst, a preparation method thereof and a using method thereof, mainly solving a technical problem, namely the utilization rate reduction of molecular sieve pore channels due to addition of binders in forming processes. A ZSM-5 molecular sieve, solid powder silica and modifying components are mixed, extruded into bars and formed, and subjected to solid crystallization in organic amine vapour, wherein the crystallization time is 16-150 h and the crystallization temperature is 40-200 DEG C. In the binder-free ZSM-5 molecular sieve catalyst with fine crystal grains, the weight ratio of silicon to aluminum based on oxides is Al2O3:SiO2(by weight)=0-6:100 and the grain size of the molecular sieve is smaller than 1 [mu]m. The modifying component phosphorous accounts for 0.1-10% of the whole catalyst and the modifying component lanthanide series metal accounts for 0.01-5% of the whole catalyst. The binder-free ZSM-5 molecular sieve catalyst can be used in the fields of catalysts used for low-carbon olefin preparation through petroleum hydrocarbon cracking, and the fields of preparation and applications of the catalysts.

Description

technical field [0001] The invention relates to the field of molecular sieve catalysts, in particular to a binder-free ZSM-5 molecular sieve catalyst and a preparation and use method thereof. More specifically, it relates to a catalyst used in the process of preparing light olefins from petroleum hydrocarbons and a preparation method thereof. Background technique [0002] Molecular sieves have uniform and ordered micropores, large specific surface area, and high hydrothermal stability, and are widely used in the field of catalysis. ZSM molecular sieves, including ZSM-5, ZSM-48, and ZSM-22, have become very important catalytic materials due to their unique pore structure and good catalytic performance, and are widely used in organic catalytic conversion reactions. [0003] Small-grain molecular sieves have shorter intracrystalline diffusion channel lengths and larger outer surfaces, which are beneficial to increase the contact opportunities between reactants and active sites...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C4/06C07C11/02C07C11/04C07C11/06
CPCY02P20/52
Inventor 吉媛媛
Owner CHINA PETROLEUM & CHEM CORP
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