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Pillared layered mordenite, and preparation method thereof

A mordenite and layered technology is applied to the preparation of swellable layered mordenite and its swelling and pillaring, and the field of pillared layered mordenite and its preparation can solve the problem of low crystallinity of mordenite and difficulty in controlling mesopores structure and distribution to avoid damage

Inactive Publication Date: 2017-03-22
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is also difficult to control the structure and distribution of mesopores
Chinese patent ZL201210125572.3 reported the use of cetyltrimethyl-p-toluenesulfonate ammonium salt as a template to prepare a layered nano-mordenite molecular sieve, but it can be found from the XRD results that the mordenite synthesized by this method low crystallinity

Method used

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  • Pillared layered mordenite, and preparation method thereof
  • Pillared layered mordenite, and preparation method thereof
  • Pillared layered mordenite, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1. Preparation of swellable layered mordenite

[0026] According to molar ratio SiO 2 / Al 2 o 3 =30, OH / SiO 2 =0.3, Na / SiO 2 =0.3, HMI / SiO 2 =0.5,H 2 O / SiO 2 =40, weigh 0.28g of sodium metaaluminate, 0.42g of sodium hydroxide, 5.05g of silica sol, 1.69g of HMI, 24.10mL of deionized water, and dissolve sodium hydroxide in 8.04mL of deionized water to prepare hydrogen Sodium oxide aqueous solution, dissolving sodium metaaluminate in 16.06mL deionized water to prepare sodium metaaluminate aqueous solution; add silica sol, HMI to the prepared sodium metaaluminate aqueous solution in sequence, and then add the prepared Aqueous sodium hydroxide solution was stirred at room temperature for 30 minutes, then the resulting mixture was transferred to a hydrothermal reaction kettle containing a polytetrafluoroethylene liner, and the hydrothermal reaction kettle was put into a homogeneous reactor, and the homogeneous reactor was set The rotation speed was 60 rpm, and the rea...

Embodiment 2

[0032] 1. Preparation of swellable layered mordenite

[0033] According to SiO 2 / Al 2 o 3 The molar ratio is 50, OH / SiO 2 The molar ratio is 0.3, Na / SiO 2 The molar ratio is 0.3, HMI / SiO 2 The molar ratio is 0.6, H 2 O / SiO 2 The molar ratio is 40, weigh 0.16g of sodium metaaluminate, 0.41g of sodium hydroxide, 4.98g of silica sol, 1.99g of HMI, and 23.89mL of deionized water, and dissolve sodium hydroxide in 7.99mL of deionized water Prepare sodium hydroxide aqueous solution, dissolve sodium metaaluminate in 15.9mL deionized water to prepare sodium metaaluminate aqueous solution; add silica sol, HMI to the prepared sodium metaaluminate aqueous solution in sequence, and then add dropwise The prepared aqueous sodium hydroxide solution was stirred at room temperature for 30 minutes, then the resulting mixture was transferred to a hydrothermal reaction kettle containing a polytetrafluoroethylene liner, and the hydrothermal reaction kettle was put into a homogeneous reactor...

Embodiment 3

[0039] 1. Preparation of swellable layered mordenite

[0040] According to SiO 2 / Al 2 o 3 The molar ratio is 100, OH / SiO 2 The molar ratio is 0.4, Na / SiO 2 The molar ratio is 0.4, HMI / SiO 2 The molar ratio is 0.5, H 2 O / SiO 2 The molar ratio is 30, weigh 0.1g of sodium metaaluminate, 0.7g of sodium hydroxide, 6.32g of silica sol, 2.11g of HMI, and 22.72mL of deionized water, and dissolve sodium hydroxide in 7.57mL of deionized water Prepare sodium hydroxide aqueous solution, dissolve sodium metaaluminate in 15.15mL deionized water to prepare sodium metaaluminate aqueous solution; add silica sol, HMI to the prepared sodium metaaluminate aqueous solution in sequence, and then add dropwise The prepared aqueous sodium hydroxide solution was stirred at room temperature for 30 minutes, then the resulting mixture was transferred to a hydrothermal reaction kettle containing a polytetrafluoroethylene liner, and the hydrothermal reaction kettle was put into a homogeneous reactor...

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Abstract

The invention discloses a pillared layered mordenite, and a preparation method thereof. According to the preparation method, silica sol is taken as a silicon source, sodium metaaluminate is taken as an aluminium source, hexamethylene imine is taken as a templating agent, dynamic hydrothermal synthesis is adopted to synthesize a swellable layered mordenite, the swellable layered mordenite is subjected to swelling with hexadecyl polyoxyethylene hexadecyl ammonium bromide, and an obtained swelled layered mordenite is reacted with tetraethoxysilane for pillaring so as to obtain the pillared layered mordenite. The preparation method is capable of obtaining the pillared layered mordenite with a novel structure; swelling and pillaring are carried out under mild conditions; destroy of high temperature and high pH value on molecular sieve skeleton and acid sites is avoided; the adopted swelling agent is cheap and easily available; and industrialized production is realized.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves and porous materials, and in particular relates to a pillared layered mordenite and a preparation method thereof, including the preparation of a swellable layered mordenite and its swelling and pillaring method. Background technique [0002] Mordenite is a typical microporous molecular sieve material with uniform pore structure, suitable acidity and good hydrothermal stability. It has become an important petrochemical catalytic material, especially in alkylation, hydroisomerization, Dewaxing and other reactions. However, mordenite is composed of interconnected twelve-membered ring channels (0.67nm×0.70nm) and eight-membered ring channels (0.34nm×0.48nm). Due to the small eight-membered ring channels, most molecules are difficult to enter. Mordenite is generally considered to have a one-dimensional pore system, which tends to result in diffusion limitation. Therefore, in order to overcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26
CPCC01B39/265C01P2002/20C01P2002/72C01P2006/12C01P2006/14
Inventor 郝青青赵东阳胡敏马晓迅陈汇勇孙鸣徐龙
Owner NORTHWEST UNIV(CN)
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