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Method for synthesizing metal-modified SAPO-34 molecular sieve

A SAPO-34, metal modification technology, applied in the direction of molecular sieve catalysts, including molecular sieve catalysts, molecular sieves and base-exchanged phosphates, etc., can solve the problem of catalyst performance degradation, catalyst performance instability, and no mention of SAPO-34 molecular sieve hydrothermal Stability and other issues, to achieve stable performance, excellent reaction performance, good hydrothermal stability

Active Publication Date: 2018-07-06
深圳科冠华太新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (101555022) reacts a metal salt solution with a template to form a complex, then adds a phosphorus source, an aluminum source, a silicon source, etc. to form a gel, then hydrothermally ages and crystallizes to prepare a metal-modified SAPO-34 molecular sieve , showed excellent catalytic performance in the reaction process of methanol to olefins, but did not mention the hydrothermal stability of SAPO-34 molecular sieve after metal modification. In the actual industrial application process, the hydrothermal stability of molecular sieve is the most important factor affecting the device. A very important indicator of whether it can run stably for a long time
However, the performance of the catalyst produced by this kind of modification method is unstable, and the performance of the catalyst decreases seriously after repeated regeneration.

Method used

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  • Method for synthesizing metal-modified SAPO-34 molecular sieve
  • Method for synthesizing metal-modified SAPO-34 molecular sieve
  • Method for synthesizing metal-modified SAPO-34 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 (Co-SAPO-34)

[0038] Cobalt nitrate 80g (analytically pure) is dissolved in 100ml water and is made into solution for subsequent use, and 840g pseudo-boehmite (Al 2 o 3 67% by mass) was dissolved in 200ml of deionized water and stirred evenly, then added to the aqueous solution of cobalt nitrate, stirred at room temperature for 2 hours, filtered, washed, dried, and then calcined at 300°C for 2 hours. The solid product after roasting is redispersed in 200ml deionized water, successively adds 1272g food-grade phosphoric acid (H 3 PO 4 Mass percent composition 85%), 305g silica sol (SiO 2 27% by mass), 1680g triethylamine (99.8% by mass of triethylamine), stirred at room temperature for 2h, and the formed homogeneous gel mixture was packed into a polytetrafluoro reactor, aged at 170°C for 16h, Crystallization at 200°C for 12 hours.

[0039]The reaction product was centrifuged, filtered, washed, dried at 100°C, and then calcined at 550°C for 3 hours to obtai...

Embodiment 2

[0048] Example 2 (Mg-SAPO-34)

[0049] Magnesium nitrate 25g (analytically pure) is dissolved in 50ml water and is made into solution for subsequent use, and 840g pseudo-boehmite (Al 2 o 3 Quality white powder content 67%) was dissolved in 200ml of deionized water and stirred evenly, then added to the aqueous solution of magnesium nitrate, stirred at room temperature for 2h, filtered, washed, dried, and roasted at 400°C for 5 hours. The solid product after roasting is redispersed in 200ml deionized water, successively adds 1272g food-grade phosphoric acid (H 3 PO 4 Percentage content 85%), 268g ethyl orthosilicate (SiO 2 mass percentage content 25%), 1080g diethylamine (diethylamine percentage content 99.8%), stir 2h at room temperature, the homogeneous gel mixture that forms is packed in the Teflon reactor, 60 ℃ aging 8h, 200 ℃ crystallization for 12 hours.

[0050] The reaction product was centrifuged, filtered, washed, dried at 160°C, and then calcined at 550°C for 3 h...

Embodiment 3

[0051] Example 3 (Zn-SAPO-34)

[0052] Dissolve 50g of zinc acetate (analytically pure) in 100ml of water to make a solution for later use, dissolve 568g of aluminum oxide (99% in mass content) in 200ml of deionized water and stir evenly, then add it to the aqueous solution of zinc acetate, stir at room temperature for 6h, filter , After washing and drying, bake at 500°C for 3 hours. The solid product after roasting is redispersed in 200ml deionized water, successively adds 1272g food-grade phosphoric acid (H 3 PO 4 Percentage 85%), 115g white carbon black (SiO 2 mass percentage content 90%), 1400g triethylamine (triethylamine percentage content 99.8%), tetraethylammonium hydroxide 202g (tetraethylammonium hydroxide 25%) stirred at room temperature 2h, the formed homogeneous condensation Put the glue mixture into a PTFE reactor, age at 130°C for 10 hours, and crystallize at 200°C for 20 hours.

[0053] The reaction product was centrifuged, filtered, washed, dried at 120° C...

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Abstract

The invention discloses a method for synthesizing a metal-modified SAPO-34 molecular sieve. The method comprises the following steps: preparing a metal salt into an aqueous solution; adding an aluminum source to be stirred uniformly; then, filtering, washing, drying, calcining at a low temperature, and then re-dispersing in a small amount of water; sequentially adding a phosphorus source, a silicon source and a template agent; stirring to form a gel mixture; and ageing, crystallizing, washing, drying and calcining to prepare the metal-modified SAPO-34 molecular sieve. The metal-modified SAPO-34 molecular sieve prepared in the invention has relatively high crystallinity, shows high low-carbon olefin selectivity when use for catalyzing reaction of preparing olefin from methanol, has the advantages of high ethylene selectivity, yield, low synthesis costs and easy industrial large-scale production.

Description

technical field [0001] The invention relates to the field of SAPO-34 molecular sieves, in particular to a synthesis method for high and low-carbon olefins selective metal-modified SAPO-34 molecular sieves and an application in catalytic methanol-to-olefins reaction. Background technique [0002] SAPO-34 molecular sieve is made of [SiO 4 ], [AlO 4 ], [PO 4 ] The microporous crystal composed of tetrahedral units has a chabazite (CHA) eight-membered ring channel structure with a pore diameter of about 0.38nm. It has a suitable acid center and good thermal and hydrothermal stability. It is an excellent methanol production Catalyst for low carbon olefins. [0003] In order to continuously improve the performance of SAPO-34 molecular sieve in catalytic methanol to olefins reaction, it is necessary to modify SAPO-34 molecular sieve. At present, the modification methods of SAPO-34 molecular sieve mainly include metal doping; preparation of hierarchical porous structure SAPO-34 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08B01J29/85C07C1/20C07C11/04C07C11/06
CPCB01J29/85B01J2229/18C01B37/08C01B39/54C01P2002/72C07C1/20C07C2529/85C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 狄春雨任雅梅
Owner 深圳科冠华太新材料技术有限公司
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