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Mesoporous zeolites and methods for the synthesis thereof

A technology of mesoporous zeolite and zeolite, applied in the field of mesoporous zeolite and the manufacture of mesoporous zeolite, can solve the problems of reduced catalytic activity, destabilized structure, lack of necessary acidity, etc.

Inactive Publication Date: 2020-04-10
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although mesoporous silica offers larger pore sizes, eliminating pretreatment steps, silica-based materials lack the necessary acidity conferred by zeolites, and as such catalytic activity is reduced
Furthermore, because a large percentage of the silicon atoms in the framework had to be removed, attempts to increase acidity by incorporating heteroatoms found in zeolites such as aluminum resulted in structural destabilization

Method used

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  • Mesoporous zeolites and methods for the synthesis thereof
  • Mesoporous zeolites and methods for the synthesis thereof
  • Mesoporous zeolites and methods for the synthesis thereof

Examples

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example

[0060] Using the methods of the present disclosure, mesoporous zeolites were produced to exemplify the previously described properties. Four exemplary methods were performed according to the present disclosure, in which silicon dioxide (SiO 2 ) and alumina (Al 2 o 3 ) ratio changes. Four additional exemplary methods were performed to vary the amount and type of cellulosic material used.

example 1

[0061] Example 1 - Si / Al ratio of 15

[0062] By suspending 3.45 grams (g) of fumed silica in 80 g of H 2 O to prepare Example 1. Next, 0.283 g of NaOH in 5 mL of water followed by 15.23 g of TEAOH (35% in water) were both added to the fumed silica. The mixture was stirred vigorously for one hour. In a separate beaker, 1.44g Al(NO 3 ) 3 9H 2 O dissolved in 50g H 2 O, and the resulting solution was added to the suspended fumed silica mixture. The mixture was stirred for 30 minutes. Suspend 1.0 g of previously freeze-dried CNC in about 20 mL of H 2 O and homogenization was performed for 1 hour using a sonic mixer LabRam at an intensity of 80% (70G acceleration). The resulting opaque suspension was added to the mixture and stirred for 30 minutes. Volatiles were removed on a rotary evaporator and the water bath was heated to 60°C. The resulting off-white sticky solid was crushed in a mortar. The resulting glassy gel powder was transferred to a 15 mL crucible placed o...

example 2

[0063] Example 2 - Si / Al ratio of 30

[0064] By suspending 3.45 grams (g) of fumed silica in 80 g of H 2 O to prepare Example 2. Next, both 0.166 g of NaOH in 5 mL of water and 8.96 g of TEAOH (35% in water) were added to the fumed silica. The mixture was stirred vigorously for one hour. In a separate beaker, 0.720g Al(NO 3 ) 3 9H 2 O dissolved in 20g H 2 O, and the resulting solution was added to the suspended fumed silica mixture. The mixture was stirred for 30 minutes. Suspend 0.75 g of previously freeze-dried CNC in about 20 mL of H 2 O and homogenization was performed for 1 hour using a sonic mixer LabRam at an intensity of 80% (70G acceleration). The resulting opaque suspension was added to the mixture and stirred for 30 minutes. Volatiles were removed on a rotary evaporator and the water bath was heated to 60°C. The resulting off-white sticky solid was crushed in a mortar. The resulting glassy gel powder was transferred to a 15 mL crucible placed on top o...

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Abstract

Methods for producing mesoporous zeolites are provided. In some embodiments, the method includes mixing a silicon-containing material, an aluminum-containing material, or both, with a quaternary amineand at least one base to produce a zeolite precursor solution. The zeolite precursor solution is combined with nanocellulose to form a zeolite precursor gel, from which volatiles are removed. The zeolite precursor gel is crystallized to produce a crystalline zeolite intermediate. The crystalline zeolite intermediate is calcined to form the mesoporous zeolite. The nanocellulose mesopores templatemay include cellulose nanocrystals, nanocellulose fibers, or combinations thereof. The quaternary amine may include tetraethylammonium hydroxide, tetraethylamonnium alkoxide, tetrapropylammonium alkoxide, other alkaline materials comprising ammonium, or combinations thereof.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application Serial No. 15 / 670,686, filed August 7, 2017, which is incorporated by reference in its entirety. technical field [0003] The present disclosure generally relates to mesoporous zeolites and methods of making mesoporous zeolites. In particular, the present disclosure relates to mesoporous zeolites and methods of making mesoporous zeolites that are useful in the synthesis of porous catalytic materials. Background technique [0004] Zeolites are aluminum silicate ores extremely useful in a variety of applications including oil refining, adsorption and separation processes as size / shape selective heterogeneous catalysts, encapsulants, slow release agents and in ion exchange form , to name a few. However, the pore size of most zeolites (less than 0.74 nm in diameter) generally limits the use of zeolites in many applications. [0005] In the petroleum process, upg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/02C01B39/20C01B39/26C01B39/40C01B39/48
CPCC01B37/02C01B39/265C01B39/40C01B39/36C01B39/48C01B39/205B01J29/041B01J29/06B01J29/08B01J29/18B01J29/40B01J29/7007C01P2006/16C07C211/62C01C1/04G01N23/20B01J37/08
Inventor 塔蒂阿娜·皮柳吉纳
Owner SAUDI ARABIAN OIL CO
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