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Method for synthesizing mordenite (MOR) molecular sieve as well as product and application of molecular sieve

A technology of mordenite and molecular sieve, which is applied in the field of adsorption materials, catalytic materials, and inorganic porous materials, to achieve the effects of good selectivity, simple process and high conversion rate

Active Publication Date: 2018-06-29
YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The location and distribution of molecular sieve B acid centers are closely related to the synthesis method of molecular sieves (J. Ddeek, et al. Catal, Catal. Reviews: Science and Engineering, 2012, 54(2), 135-223), and by effectively controlling the synthesis process , the research on directly obtaining B acid site placement and distribution adjustable MOR molecular sieves is rarely involved

Method used

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  • Method for synthesizing mordenite (MOR) molecular sieve as well as product and application of molecular sieve
  • Method for synthesizing mordenite (MOR) molecular sieve as well as product and application of molecular sieve
  • Method for synthesizing mordenite (MOR) molecular sieve as well as product and application of molecular sieve

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Experimental program
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preparation example Construction

[0044] The synthetic method of the MOR molecular sieve provided by the present invention that can directly adjust the location and distribution of the B acid center includes the following aspects:

[0045] I. the present invention provides a kind of method that synthetic acid center preferentially falls in the mordenite MOR molecular sieve of 8-membered ring " side pocket " in the presence of inorganic bases and comprises the following steps:

[0046] a) will be Al 2 o 3 Aluminum source in terms of SiO 2 Calculated silicon source, inorganic base M 2 O, additional reagent N and water H 2 O is mixed to form an initial mixture A having the following molar ratio composition;

[0047] al 2 o 3 : SiO 2 =0.005~0.1:1

[0048] m 2 O: SiO 2 =0.05~1:1

[0049] N: SiO 2 =0.1~1:1

[0050] h 2 O: SiO 2 =5~60:1;

[0051] b) A certain proportion of mordenite MOR molecular sieve seed crystal S is added to the gel mixture A obtained in step a), and stirred evenly to obtain the i...

Embodiment 1

[0100] Synthesis of Mordenite MOR Molecular Sieve by Adding Additional Reagent Trimethylamine in the Presence of Inorganic Base NaOH

[0101] First, 0.67 g of sodium metaaluminate was dissolved in deionized water, and then 1.88 g of sodium hydroxide was added thereto. After a clear solution was formed, 37.65 g of silica sol (SiO 2 content is 28.5%), 4.54g trimethylammonium, continue stirring at room temperature until forming a uniform silica-alumina gel, then add MOR seed crystal 0.1g to the silica-alumina gel formed to form a mixed raw material, and finally transfer the mixed raw material to the belt In a PTFE-lined stainless steel reactor, dynamic crystallization at 170°C for 48 hours, the molar ratio of the reaction raw materials is as follows: 0.025Al 2 o 3 : SiO 2 : 0.08Na 2 O:0.28TMA:20H 2 O, the product is suction filtered and dried to obtain MOR molecular sieve.

[0102] figure 2 is the XRD pattern of the sample, by figure 2 It can be seen that the obtained ...

Embodiment 2-12

[0109] Example 2-12 Sample 2 # -12 # preparation of

[0110] The specific batching ratio and crystallization conditions are shown in Table 2, and the specific batching process is the same as in Example 1.

[0111] The synthesized samples were analyzed by XRD, and the data results were compared with figure 2 Close, that is, the position and shape of the diffraction peaks are the same, and the relative peak intensity fluctuates in the range of ±5% according to the change of the synthesis conditions, indicating that the synthesis products are all pure-phase mordenite MOR. The sample after roasting and ion exchange is subjected to an acid test, and the test method is the same as in Example 1.

[0112] Table 2 Molecular sieve synthesis ingredients and crystallization conditions table

[0113]

[0114] Note * :Si source: a Silica sol; b white carbon black; c Ethyl orthosilicate; d Methyl orthosilicate; e silicone gel; f water glass; g Coarse porous silica fume; h Fi...

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Abstract

The invention discloses a synthesis method of a B acid center-setting and distribution-adjustable mordenite (MOR) molecular sieve as well as a product and application of the molecular sieve. Particularly, the invention relates to a method for synthesizing an MOR molecular sieve, the acid center of which is preferentially set in a 'side pocket' of an eight-membered ring communicated with a twelve-membered ring hole, with or without the existence of inorganic alkali. The method comprises the step of introducing an additional reagent and a randomly selected fluorination reagent which are of different structures and charge densities into synthetic gel, and the B acid center of the obtained MOR is preferentially set in the 'side pocket' of the eight-membered ring communicated with the twelve-membered ring hole. A catalyst product obtained through the method is excellent in adsorption and catalysis properties. The synthesis method disclosed by the invention is simple, has a wide industrial application prospect, and is particularly applied to dimethyl ether carbonylation reaction catalysts.

Description

technical field [0001] The invention belongs to the field of inorganic porous materials, adsorption materials and catalytic materials, and specifically relates to a method for synthesizing mordenite MOR molecular sieves, products and applications thereof. Background technique [0002] Due to their specific pore structure and uniform pore size, porous materials are widely used in many fields such as adsorption, separation, ion exchange and catalysis. Mordenite (MOR) is one of the earliest zeolites recognized by humans, and can be divided into two types: natural and synthetic. In 1864, How first named natural mordenite. [0003] figure 1 A schematic diagram of the pore structure of the MOR molecular sieve is shown. Such as figure 1 As shown, MOR molecular sieves have two parallel channels of 12-membered ring and 8-membered ring in the [001] direction, and the channel sizes are about Because the diameter of the 8-membered ring channel in the [001] direction is too small, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26C01B39/06B01J29/18C07C67/37C07C69/14
CPCB01J29/18C01B39/06C01B39/265C01P2002/72C01P2004/03C01P2006/80C07C67/37C07C69/14
Inventor 王林英田鹏刘中民杨虹熠郜贝贝吴鹏飞乔昱焱
Owner YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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