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Methanol-to-light olefin catalyst with high propylene selectivity and its application

A low-carbon olefin and catalyst technology, applied in the field of catalysts, can solve the problem of low selectivity of low-carbon olefin products and achieve the effect of improving selectivity

Active Publication Date: 2017-01-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although compared with SAPO-34, ZSM-5 has the advantages of good anti-coking performance and long life, but its pore structure characteristics and acid distribution determine that aromatic compounds are easily generated on the catalyst, so even after modification, it is still suitable for Lower selectivity for lower olefin products

Method used

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  • Methanol-to-light olefin catalyst with high propylene selectivity and its application
  • Methanol-to-light olefin catalyst with high propylene selectivity and its application
  • Methanol-to-light olefin catalyst with high propylene selectivity and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] It was prepared by the preparation method of Journal of Catalysis (2006, 238: 79-87), and a sample with a Si / Ge molar ratio of 15 was synthesized in Example 1. Except for the Si / Ge molar ratio, the ratio of other raw materials is the same as that of Comparative Example 1. The synthesized aluminosilicate germanate ITQ-13 adopts a gel with the following molar composition:

[0031] 1SiO 2 :0.066GeO 2 :0.0168Al 2 o 3 :0.1R(OH) 2 :0.05F:20H 2 o

[0032] Add 31.42ml tetraethyl orthosilicate (TEOS), 0.97g germanium dioxide (purity 99.98wt%), and 0.97g aluminum isopropoxide to 17.47g template agent R(OH) with a mass percentage of 19.05% in sequence 2(hexamethylammonium hydroxide) aqueous solution, and then add 0.35 g of hydrofluoric acid and 36.36 g of distilled water to the above sol. Stir well to form a homogeneous sol. The above sol was transferred into a synthesis kettle with a polytetrafluoroethylene liner, and statically crystallized in a homogeneous reactor at 1...

Embodiment 2

[0035] Prepared by the preparation method of Journal of Catalysis (2006, 238:79-87), silicon germanium aluminum acid ITQ-13 was synthesized with a gel having the following molar composition:

[0036] 1SiO 2 :0.05GeO 2 :0.01Al 2 o 3 :2.0R(OH) 2 :1.0F:50H 2 o

[0037] 2.1g silica sol (SiO 2 The mass percentage content is 40wt.% aqueous solution), 0.073g germanium dioxide (purity 99.98wt%), 0.057g aluminum isopropoxide are added to 34.72g mass percentage content is 19.05% templating agent R (OH) 2 (hexamethylammonium hydroxide) aqueous solution, and then add 0.07 g of hydrofluoric acid to the above sol. Stir well to form a uniform sol, and distill off 15.4 g of water in a 60°C water bath. The above sol was transferred into a synthesis kettle with a polytetrafluoroethylene liner, and statically crystallized in a homogeneous reactor at 120° C. for 25 days. The crystallized product was fully washed, centrifuged and dried at 105°C for 12 hours to obtain the molecular sieve p...

Embodiment 3

[0039] Prepared by the preparation method of Journal of Catalysis (2006, 238:79-87), silicon germanium aluminum acid ITQ-13 was synthesized with a gel having the following molar composition:

[0040] 1SiO 2 :0.03GeO 2 :0.001Al 2 o 3 :1.0R(OH) 2 :0.6F:7H 2 o

[0041] Add 30.40ml TEOS, 0.43g germanium dioxide (99.98wt%), and 0.021g aluminum hydroxide to 128.8g template agent R(OH) with a mass percentage of 25% in sequence 2 (hexamethylammonium hydroxide) in aqueous solution, and then 3.16 g of ammonium fluoride (purity >96%) was added to the above sol. Stir well to form a uniform sol, and distill off 74.5g of water in a 70°C water bath. The above sol was transferred into a synthesis kettle with a polytetrafluoroethylene liner, and dynamic crystallization was carried out in a homogeneous reactor at 200°C for 12 days. The crystallized product was fully washed, centrifuged and dried at 105°C for 12 hours to obtain the molecular sieve powder. The original powder was calcine...

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Abstract

The invention discloses a high propene selectivity catalyst for methanol to olifens. The catalyst is characterized by comprising the ITH topological structure, and the skeleton elements of the catalyst include silicon, germanium, aluminum and oxygen, wherein the molar ratio of Al2O3 to SiO2 is 1: (20-1000), and the molar ratio of SiO2 to GeO2 is (12-500): 1. The catalyst has the advantages of being high in propene selectivity and high in mass ratio of propene to ethylene.

Description

technical field [0001] The invention relates to a catalyst for producing low-carbon olefins from methanol with high propylene selectivity and its application. Background technique [0002] Propylene is an important basic raw material in the modern chemical industry. With the rapid growth of demand for derivatives such as polypropylene, the demand for propylene is increasing year by year. However, due to the depletion of petroleum resources and the difficulty of meeting the rising demand for products through the traditional propylene petroleum production route, it has become a very important issue to seek a non-petroleum route to produce propylene. Catalytic production of light olefins (Methanol to Olefins, referred to as MTO) or methanol to propylene (Methanol to Propene, referred to as MTP) using methanol as a raw material is the most promising new process to replace the petroleum route. [0003] The catalyst frequently used in the MTO reaction is silicon-containing phosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70C07C1/20C07C11/02C07C11/06C07C11/04C07C11/08
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 樊卫斌李丽萍李俊汾董梅王建国
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI