Adhesive-free AEI/MFI eutectic silicon-aluminum molecular sieves as well as synthetic method and application

A silica-alumina molecular sieve and a synthesis method technology are applied in the application fields of conversion rate and yield, and can solve the problems of weak acidity, low reactivity, single pore size of porous materials, etc. The effect of application requirements

Active Publication Date: 2017-05-31
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is the problem that the porous material synthesized in the prior art has a single pore size, weak acidity and low reactivity. A new eutectic silicon-aluminum molecular sieve is provided, which has multi-stage channels and acid distribution. Advantages of wider range and higher reactivity

Method used

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  • Adhesive-free AEI/MFI eutectic silicon-aluminum molecular sieves as well as synthetic method and application
  • Adhesive-free AEI/MFI eutectic silicon-aluminum molecular sieves as well as synthetic method and application
  • Adhesive-free AEI/MFI eutectic silicon-aluminum molecular sieves as well as synthetic method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) 197.8g ZSM-5 molecular sieve (silicon-alumina ratio is 25) was added to 1760.4g concentration of 39.1wt% glucose solution, stirred for 30min and placed in an ultrasonic cleaner for 2h, then the mixture was filtered to obtain The product was dried at 120° C. for 24 hours, and then calcined at 500° C. for 2 hours in a nitrogen atmosphere to obtain a pretreated ZSM-5 molecular sieve.

[0042] (2) Get the above-mentioned pretreated ZSM-5 molecular sieve, 14.69g HY molecular sieve, 409.2g silica gel solution (Ludox-AS30) and deionized water to mix and prepare into a slurry with a solid content of 35%, after spray drying (inlet temperature 140 °C, outlet temperature 80 °C) to obtain microspheres with an average particle size of 60-80 μm, and then calcined at 800 °C for 4 hours to obtain pretreated microspheres.

[0043] (3) Mix the above-mentioned pretreated microspheres with 46.57g NaOH, 120.2g of N,N-dimethyl-3,5-dimethylpiperidine (template agent concentration 18.94wt%...

Embodiment 2

[0046] The process for synthesizing the AEI / MFI eutectic silica-alumina molecular sieve is similar to that of Example 1, except that the slurry concentration for spray drying is 25%, and the template agent used is N,N-dimethyl-2,6-di Methylpiperidine (template agent concentration 20.0wt%), measuring the silicon-aluminum ratio of the eutectic silicon-aluminum molecular sieve is 58.9, and the obtained sodium-type AEI / MFI eutectic silicon-aluminum molecular sieve microspheres use 1.0mol / L concentration zinc nitrate aqueous solution Perform ion exchange. The addition amount of various raw materials synthesized by crystallization is shown in Table 1, figure 2 The XRD diffraction pattern shown in proves that the material is an AEI / MFI eutectic silica-alumina molecular sieve, denoted as B.

Embodiment 3

[0048] The process for synthesizing the AEI / MFI eutectic silica-alumina molecular sieve is similar to Example 1, except that the concentration of the slurry for spray drying is 45%, and the template agent used is N,N-diethyl-2,6-di Methylpiperidine (template agent concentration 20.0wt%), measuring the silicon-aluminum ratio of the eutectic silicon-aluminum molecular sieve is 82.7, and the obtained sodium-type AEI / MFI eutectic silicon-aluminum molecular sieve microspheres use 1.0mol / L concentration copper nitrate aqueous solution Perform ion exchange. The addition amount of various raw materials synthesized by crystallization is shown in Table 1, image 3 The XRD diffraction pattern shown in proves that the material is an AEI / MFI eutectic silica-alumina molecular sieve, denoted as C.

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Abstract

The invention discloses adhesive-free AEI / MFI eutectic silicon-aluminum molecular sieves as well as a synthetic method and application thereof. MFI silicon-aluminum molecular sieves are added into a glucose solution, ultrasonically treated, filtered, dried and roasted to obtain treated MFI silicon-aluminum molecular sieves; and then the treated MFI silicon-aluminum molecular sieves are mixed with FAU silicon-aluminum molecular sieves, silica sol and / or water glass to obtain 15.0-60.0wt% size, microspheres having the average particle diameter of 60-80 mum are prepared by a spray drying method, and the microspheres are roasted 4-10 hours at 600-900 DEG C and crystallized in situ with an alkali source, a piperidinium organic template agent and deionized water to synthesize adhesive-free AEI / MFI eutectic silicon-aluminum molecular sieve microspheres. A molecular sieve catalyst for MTO reaction can be obtained from the microspheres after ion exchange. The AEI / MFI eutectic silicon-aluminum molecular sieves have the advantages of multi-level pores, wide acid distribution and high reaction activity, and are particularly suitable for improving the low carbon olefin selectivity in the MTO reaction.

Description

technical field [0001] The present invention relates to a kind of binderless AEI / MFI composite silica-alumina molecular sieve and its synthesis method, it is converted into olefins in oxygen-containing compound such as methanol, especially improves the conversion ratio and productivity applications. Background technique [0002] Light olefins are widely used in the chemical industry as basic chemical raw materials, and play a pivotal role in the modern petrochemical industry. The demand for them has increased rapidly in recent years, and the supply has been in short supply. The traditional preparation process of low-carbon olefins is petroleum cracking, but due to the non-renewability of petroleum resources, the increasing shortage of reserves, the sharp fluctuations in prices, and the high energy consumption, high pollution, and low selectivity of low-carbon olefins in the petroleum cracking route In order to solve the problem, various scientific research institutions in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40B01J29/80C07C1/20C07C11/04C07C11/06C07C11/08
CPCB01J29/80C01B39/40C01P2002/72C07C1/20C07C2529/80C07C11/04C07C11/06C07C11/08Y02P20/52Y02P30/20Y02P30/40
Inventor 王志光李进王炳春刘宇婷王建青王贤彬
Owner CHINA CATALYST HLDG CO LTD
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