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Mordenite molecular sieve as well as preparation method and application thereof

A mordenite and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of difficult aluminum distribution regulation, easy carbon deposition and deactivation, poor hydrothermal stability, etc., and achieves the effects of improving stability, simple process and facilitating large-scale industrial production.

Pending Publication Date: 2022-06-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing synthesis technology is generally difficult to achieve the regulation of aluminum distribution.
In addition, mordenite with a low silicon-aluminum ratio has some obvious shortcomings in practical applications, such as poor hydrothermal stability, easy carbon deposition and deactivation, etc.

Method used

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  • Mordenite molecular sieve as well as preparation method and application thereof
  • Mordenite molecular sieve as well as preparation method and application thereof
  • Mordenite molecular sieve as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] The molar proportions of each raw material and the crystallization conditions are shown in Table 1. First, 1.643g of sodium aluminate was added to 35g of deionized water, and then 1.617g of sodium hydroxide was added to it. After mixing evenly, 1g of tetramethylmethanediamine, 2g of cyclohexylamine, 40g of silica sol, and 0.25g of seed crystals were added. Continue stirring at room temperature until a homogeneous initial gel forms. The gel was put into a stainless steel reactor with a polytetrafluoroethylene lining, and the temperature was raised to 160 °C for crystallization for 30 h. The obtained solid product was centrifuged, washed with deionized water until neutral, and dried in air at 110 °C to obtain The original powder is recorded as sample 1#.

[0139] The product was subjected to XRD analysis, and the results showed that the synthesized product had the characteristics of MOR structure (see XRD pattern in figure 1 ). The elemental composition of the molecula...

Embodiment 2-20

[0142] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as that in Example 1.

[0143] The synthesized sample was analyzed by XRD, and the X-ray diffraction pattern of the product had figure 1 The characteristic is proved to be mordenite molecular sieve.

[0144] The phase element composition of the molecular sieve product was analyzed by XRF, and the silicon-aluminum ratio was listed in Table 1.

[0145] The hydrogen type infrared spectrum of the obtained sample was measured, and according to the literature (JACS, 2007, 129, 4919-4924), the 3610 cm -1 The nearby bridge hydroxyl groups were subjected to peak fitting, and the percentage of B acid in the total B acid in the 8-membered ring pore was obtained, which is listed in Table 1.

[0146] Table 1 Molecular sieve synthesis ingredients and crystallization conditions *

[0147]

[0148] Note*: Silicon source: a means silica sol; b means white ...

Embodiment 21

[0157] Except replacing sodium hydroxide with potassium hydroxide, other batching ratios and batching processes, and crystallization conditions are the same as those in Example 9. The product is subjected to XRD analysis, and the X-ray diffraction spectrum of the product has figure 1 The characteristic is proved to be mordenite molecular sieve.

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Abstract

The invention discloses a mordenite molecular sieve as well as a preparation method and application thereof. The invention relates to a mordenite molecular sieve. The mordenite molecular sieve is selected from any one of the following anhydrous chemical formulas, r is a first template agent, and R is selected from any one of tetramethyl diamine compounds; q is a second template agent, and Q is selected from any one of cyclohexylamine compounds; m is an alkali metal ion; a represents the mole number of R corresponding to each mole of (SixAly) O2; b represents the mole number of Q corresponding to each mole of (SixAly) O2; c represents the mole number of M corresponding to each mole of (SixAly) O2; x and y respectively represent mole fractions of Si and Al. The mordenite molecular sieve is prepared from double template agents, on one hand, a high silica-alumina ratio can be obtained, and on the other hand, the proportion of an acid center of an 8-membered ring pore channel of the mordenite molecular sieve to a total B acid center can be flexibly adjusted within a certain range.

Description

technical field [0001] The application relates to a mordenite molecular sieve, a preparation method and an application, and belongs to the field of molecular sieves. Background technique [0002] Porous materials are widely used in many fields such as adsorption, separation, ion exchange and catalysis due to their specific pore structure and uniform pore size. Mordenite (abbreviated as MOR) is one of the earliest known zeolites, and it is divided into two types: natural and synthetic. In 1864, How named the natural mordenite for the first time. The framework of mordenite consists of 12-membered rings along the c-axis and 8-membered ring The channels are composed of 8-membered rings along the b-axis. The short pore channels are interconnected, and the two intersecting 8-membered ring pore channels constitute "side pockets". Due to the narrow 8-membered ring channel along the c-axis, most molecules cannot pass through, so MOR mostly behaves as a one-dimensional porous ...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01J29/18C07C67/37C07C69/14
CPCC01B39/04B01J29/18C07C67/37C01P2002/72C01P2002/82C01P2004/03C07C69/14Y02P20/584Y02P20/52
Inventor 曹凯鹏田鹏樊栋王林英朱大丽刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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