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A kind of preparation method and application of mordenite with mesoporous and microporous

A mordenite and microporous technology, applied in chemical instruments and methods, carbon monoxide or formate reaction preparation, crystalline aluminosilicate zeolite, etc., can solve the problems of restricting the diffusion of aromatic hydrocarbons, catalyst deactivation, affecting catalyst activity, etc. , to achieve the effect of being conducive to large-scale industrial production, simple process and easy separation

Active Publication Date: 2018-10-09
YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in practical applications, its relatively narrow pore structure will restrict the diffusion of macromolecules such as aromatic hydrocarbons, which will easily cause catalyst deactivation.
On the other hand, a large number of active sites are difficult to access due to severe diffusion limitation, which seriously affects the activity of the catalyst.

Method used

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  • A kind of preparation method and application of mordenite with mesoporous and microporous
  • A kind of preparation method and application of mordenite with mesoporous and microporous
  • A kind of preparation method and application of mordenite with mesoporous and microporous

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Example 1: Sample 1 # preparation of

[0070] First, 20g of silica sol, 0.55g of sodium hydroxide, 34.55g of water and 0.59g of tetraethylammonium hydroxide (TEAOH, 25%) were mixed, stirred, pre-crystallized at 50°C for 2h, and then added dropwise to alumina An aqueous solution of sodium (0.467 g sodium aluminate dissolved in 5.4 g water) was stirred until a homogeneous gel formed. The gel was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, crystallized at 130°C for 168h, the resulting solid product was centrifuged, washed with deionized water until neutral, dried in air at 110°C, and Finally, it was calcined at 550°C for 6 hours in a muffle furnace to obtain a nano-sized mordenite with mesopores and micropores, which is designated as sample 1. # . Prepared sample 1 # The raw material type and proportion, precrystallization temperature and time, and crystallization temperature and time in the gel are as sample 1 in Table 1 respec...

Embodiment 2～25

[0071] Embodiment 2~25: sample 2 # ~25 # preparation of

[0072] Silicon source (as SiO 2 In total, both are 0.1mol), water, sodium hydroxide (potassium), and templating agent R are mixed and stirred uniformly to form a mixture I. The obtained mixture I is pre-crystallized to form the precursor II. Then the dissolved aluminum source aqueous solution (the aluminum source in Example 2 was dissolved in 27 g of water; the aluminum source in Examples 3 to 25 was dissolved in 10 g of water) was added to the precursor II, and stirred until a uniform initial gel mixture was formed III. The mixture III was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene for hydrothermal crystallization, and the resulting solid product was centrifuged, washed with deionized water until neutral, dried in air at 110 °C, and finally Calcined at 550°C for 6h in a muffle furnace to obtain nano-sized mordenite with mesopores and micropores, designated as sample 2 # ~2...

Embodiment 26

[0082] Example 26: Sample 1 # ~25 # , D1 # and D2 # The ratio of silicon to aluminum

[0083] For sample 1 # ~25 # , D1 # and D2 # Perform XRF characterization, determine elemental composition, and calculate its SiO 2 / Al 2 o 3 The molar ratio is shown in Table 2.

[0084] Table 2 Sample 1 # ~25 # , D1# and D2 # The ratio of silicon to aluminum

[0085]

[0086]

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Abstract

The present invention discloses a synthesis method, a product and applications of mordenite having mesopores and micropores. According to the method, a microporous templating agent, a silicon source and an alkali source are dissolved in water, pre-crystallization is performed, an aluminum source is added, and then crystallization is performed. According to the present invention, with the method, the mesoporous templating agent is not required to be added, and the obtained mordenite has micropores and mesopores, and has excellent performances and stability in the fields of adsorption and catalysis; and the synthesis method is simple, and especially the broad industrial application prospect is provided when the mordenite is applied in the dimethyl ether carbonylation reaction catalyst.

Description

technical field [0001] The application belongs to the field of chemistry and chemical engineering, and in particular relates to a synthesis method and application of mordenite with mesopores and micropores. Background technique [0002] Mordenite has two-dimensional channels, and its structure was determined by Meier in 1961. The channel structure of the molecular sieve consists of 0.67*0.70nm twelve-membered ring channels and 0.34*0.48nm eight-membered ring channels. Since the pores of the eight-membered ring are too small, many molecules cannot enter, so mordenite is generally considered to be a molecular sieve with one-dimensional pores. Due to the unique pore structure and acidity of mordenite, it has important applications in catalytic cracking, toluene disproportionation and transalkylation reactions, aromatics alkylation, xylene isomerization, dimethyl ether carbonylation and other reactions. [0003] However, in practical applications, its relatively narrow pore str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04B01J29/18C07C67/37C07C69/14
Inventor 袁扬扬田鹏刘中民杨虹熠王林英刘琳杨淼李冰
Owner YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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