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Gibbsite@sapo molecular sieve composite with core-shell structure and its preparation method and application in catalytic methanol to olefins

A gibbsite, core-shell structure technology, applied in molecular sieve catalysts, hydrocarbon production from oxygen-containing organic compounds, physical/chemical process catalysts, etc., can solve the problems of complex preparation process, expensive selection of raw materials, etc., and reduce production costs. , the effect of reducing catalyst consumption

Active Publication Date: 2020-03-24
辽宁金易化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the selectivity of the MTO reaction is usually improved by synthesizing molecular sieve materials with dual structure characteristics or dual pore characteristics by adjusting the silicon source and the type of template agent, but the prior art has the disadvantages of expensive raw materials and complicated preparation process, etc. factors, so there is still room for improvement

Method used

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  • Gibbsite@sapo molecular sieve composite with core-shell structure and its preparation method and application in catalytic methanol to olefins
  • Gibbsite@sapo molecular sieve composite with core-shell structure and its preparation method and application in catalytic methanol to olefins
  • Gibbsite@sapo molecular sieve composite with core-shell structure and its preparation method and application in catalytic methanol to olefins

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1 Gibbsite@SAPO molecular sieve composite with core-shell structure

[0036] 284.8 grams of phosphoric acid (85% by weight phosphoric acid, chemically pure reagent) and 421 grams of deionized water were beaten, and 93 grams of gibbsite (65% by weight of Al 2 o 3 , produced by Shandong Aluminum Industry) and 84 grams of pseudo-boehmite (72 wt% Al 2 o 3, produced by Shandong Aluminum Industry), stirred vigorously for 1h, then added 356.5 grams of triethylamine (chemically pure reagent) and 68.4 grams of tetraethylammonium hydroxide aqueous solution (25.3% by weight TEAOH, produced by Jiangsu Kent New Materials) as an organic template agent, and added 47 grams of polyethylene glycol 400 (chemically pure reagent), then add 23.5 grams of alkaline silica sol (30% by weight of SiO 2 , produced by Qingdao Great New Materials), vigorously stirred for 1h, and mixed evenly, the resulting slurry has the following molar ratio composition, Al 2 o 3 :P 2 o 5 : SiO 2 : ...

Embodiment 2

[0038] Example 2 Gibbsite@SAPO molecular sieve composite with core-shell structure

[0039] Beat 298.4 grams of phosphoric acid and 297 grams of deionized water, slowly add 130 grams of gibbsite and 50.4 grams of pseudoboehmite, stir vigorously for 1 hour, then add 237.6 grams of organic templates triethylamine and 205.7 grams of tetraethylhydrogen Ammonium oxide aqueous solution, add 23.5 grams of polyethylene glycol 400, then add 47.1 grams of alkaline silica sol, stir vigorously for 1 hour, mix well, the obtained slurry has the following molar ratio composition, Al 2 o 3 :P 2 o 5 : SiO 2 : triethylamine: tetraethylammonium hydroxide: polyethylene glycol 400: water = 1: 1.1: 0.2: 2: 0.3: 0.05: 40. The raw material slurry was transferred into a sealed stainless steel hydrothermal crystallization tank, rotated and crystallized at 120°C for 24 hours, then raised to 175°C and rotated for 60 hours under autogenous pressure. After the crystallization was completed, the crysta...

Embodiment 3

[0041] Example 3 Gibbsite@SAPO molecular sieve composite with core-shell structure

[0042] 298.4 grams of phosphoric acid and 605 grams of deionized water were beaten, slowly added 93 grams of gibbsite and 84 grams of pseudo-boehmite, vigorously stirred for 1 hour, then added 166.4 grams of triethylamine, 82 grams of morpholine ( chemically pure reagent) and 68.4 gram tetraethylammonium hydroxide aqueous solution, add 17.4 gram tert-butanol (chemically pure reagent), then add 70.6 gram acidic silica sol (25% by weight SiO 2 , produced by Qingdao Great New Materials), vigorously stirred for 1h, and mixed evenly, the resulting slurry has the following molar ratio composition, Al 2 o 3 :P 2 o 5 : SiO 2 : triethylamine: morpholine: tetraethylammonium hydroxide: polyethylene glycol 400: water = 1: 1.1: 0.25: 1.4: 0.8: 0.1: 0.2: 42. The raw material slurry was transferred into a sealed stainless steel hydrothermal crystallization kettle, rotated and crystallized at 140°C for 1...

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Abstract

The invention discloses a gibbsite@SAPO molecular sieve compound with a core-shell structure as well as a preparation method and application thereof to catalysis of methanol to olefin. The gibbsite@SAPO molecular sieve compound has the core-shell structure taking gibbsite as a core and SAPO-34 as a shell; an XRD (X-Ray Diffraction) spectrum of the compound has the characteristic that the gibbsiteand the SAPO-34 coexist, wherein the ratio of the strength of 2theta belonging to a gibbsite characteristic peak at peaks of 18.3 degrees+ / -0.10 degree to the strength of 2theta belonging to a SAPO-34characteristic peak at peaks of 18.05 degrees+ / -0.10 degree is 0.2 to 10. A catalyst containing the gibbsite@SAPO molecular sieve compound with the core-shell structure, provided by the invention, isused for the methanol to olefin reaction and has high olefin selectivity and reaction service life.

Description

technical field [0001] The invention relates to a molecular sieve compound for catalyzing methanol to olefins, and more particularly relates to a gibbsite@SAPO molecular sieve compound with a core-shell structure. Background technique [0002] Methanol-to-olefin (MTO) technology is a key technology in the new coal chemical industry that my country focuses on developing in the new century. It can replace the traditional petroleum route to realize the diversification of olefin raw materials. It has achieved large-scale industrial applications at present. [0003] An important class of catalysts used in MTO technology are molecular sieves of the silicoaluminophosphate (SAPO) family. The molecular sieve was invented by the UCC company of the United States in the early 1980s. Its skeleton is composed of phosphorus-oxygen tetrahedron, aluminum-oxygen tetrahedron and silicon-oxygen tetrahedron. The skeleton is negatively charged and can be used as a solid acid catalyst for hydrocar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J37/08C07C1/20C07C11/04C07C11/06
CPCB01J29/85B01J37/0018C07C1/20C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 刘丽滨安会勇
Owner 辽宁金易化工有限公司