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an al 2 o 3 -ce 2 o 3 /sba-15 mesoporous silicon-based material and preparation method thereof

An al2o3-ce2o3, mesoporous silicon technology, applied in the field of materials, can solve problems such as uneven distribution and damage to mesoporous structure, and achieve the effects of easy operation, good thermal stability and simple preparation method

Active Publication Date: 2019-12-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sun Linbing (Current Organic Chemistry, 2014, 18: 1296-1304) reported that metal cerium oxide was immobilized on the surface of SBA-15 by post-grafting method, but found that it was unevenly distributed on the surface of SBA-15 due to its own agglomeration phenomenon. , in addition, the basic sites of metal cerium oxide also cause some damage to the original mesoporous structure of SBA-15.

Method used

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  • an al <sub>2</sub> o <sub>3</sub> -ce <sub>2</sub> o <sub>3</sub> /sba-15 mesoporous silicon-based material and preparation method thereof
  • an al <sub>2</sub> o <sub>3</sub> -ce <sub>2</sub> o <sub>3</sub> /sba-15 mesoporous silicon-based material and preparation method thereof
  • an al <sub>2</sub> o <sub>3</sub> -ce <sub>2</sub> o <sub>3</sub> /sba-15 mesoporous silicon-based material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 2.14gAl (NO 3 ) 3 9H 2 O and 19.78g Ce(NO 3 ) 3 ·6H 2 Dissolve O together in 119mL of absolute ethanol, stir at 40°C for 3h to obtain mixed liquid A; Solution B: Slowly add the mixed solution A to the mixed solution B, stir at 40°C for 3h, then transfer to a stainless steel hydrothermal kettle lined with polytetrafluoroethylene, and crystallize at 110°C for 5h to form a crystal Chemical mixture I. Dissolve 10.35g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer in 384.5g of 1.6mol / L hydrochloric acid at 40°C, stir vigorously for 3 hours, then add 21.97g of orthosilicon Acid ethyl ester reagent, continue to stir for 12h, the formation of mixture II. Slowly add the crystallized mixture I to the mixture II under stirring, stir and mix for 6 hours, transfer to a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and crystallize at 100°C for 48 hours; filter the obtained mixed system, After washing and drying, ...

Embodiment 2

[0029] Example 2 The experimental procedure is the same as that of Example 1, the difference being that Al(NO 3 ) 3 9H 2 O, Ce(NO 3 ) 3 ·6H 2 O is 6.425g and 14.43g respectively, and the others remain unchanged. What is produced is Al with a mass molar ratio of Al, Ce, and Si elements of 0.167:0.333:1 2 o 3 -Ce 2 o 3 / SBA-15 mesoporous silicon-based material 12.56g, accounting for 99.52% of the mass percentage of Al, Ce, and Si oxides in the feed, indicating that the prepared Al 2 o 3 -Ce 2 o 3 / SBA-15 mesoporous silicon-based material has little loss after hydrothermal and calcination process, and has good stability. The analysis and characterization of BET, FT-IR, XRD, SEM, and TEM show that its mesoporous structure is damaged to a certain extent, and SBA There are many agglomerations on the -15 mesoporous surface.

Embodiment 3

[0030] Example 3 The experimental procedure is the same as in Example 1, the difference being that the Al(NO 3 ) 3 9H 2 O, Ce(NO 3 ) 3 ·6H 2 The masses of O are 4.8g and 16.7g respectively, and the others remain unchanged. What is produced is Al with a mass molar ratio of Al, Ce, and Si elements of 0.125:0.375:1 2 o 3 -Ce 2 o 3 / SBA-15 mesoporous silicon-based material 13.03g, accounting for 99.39% of the mass percentage of Al, Ce, and Si oxides in the feed, indicating that the prepared Al 2 o 3 -Ce 2 o 3 / SBA-15 mesoporous silicon-based material has little loss after hydrothermal and calcination process, and has good stability. It has been analyzed and characterized by BET, FT-IR, XRD, SEM, and TEM, showing that its mesoporous structure has been damaged, and SBA -15 mesoporous surface has some agglomeration phenomenon, but all slow down than embodiment 2.

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Abstract

The invention discloses an Al2O3-Ce2O3 / SBA-15 mesoporous silicon-based material and a preparation method thereof. A double-template method is utilized to directly plate metal cerium and aluminum oxide on the surface of SBA-15, a mesoporous structure of the prepared material is more completely maintained, and the agglomeration phenomenon of the metal cerium is eliminated. The Al2O3-Ce2O3 / SBA-15 mesoporous silicon-based material is easy to prepare and has simple work procedures and good hydrothermal stability and thermal stability.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a double template method for preparing Al 2 o 3 -Ce 2 o 3 / SBA-15 mesoporous solid silicon-based material. Background technique [0002] SBA-15 mesoporous silicon-based material has large specific surface, uniform mesoporous structure, high thermal and hydrothermal stability, but lacks active sites and poor alkali resistance, so it is limited in adsorption, separation and catalytic applications. In recent years, studies have been carried out on loading metal oxides on the surface of SBA-15 or doping them into the SBA-15 framework to improve the active sites and hydrothermal stability of SBA-15. Al 2 o 3 , MgO and rare earth metal oxides are commonly used in SBA-15 material modification. Patent 201410318627.1 adopts one-step hydrothermal method to convert Al 2 o 3 Doped in the SBA-15 framework to make flake Al 2 o 3 -SBA-15 material, improve SBA-15 mesoporous structure characteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/28B01J20/08
CPCB01J20/02B01J20/06B01J20/08B01J20/28083B01J2220/42
Inventor 刘跃进李姗姗李蒙刘宁吴志民李勇飞
Owner XIANGTAN UNIV
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