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Fe2O3/Silicalite-1 molecular sieve nanowire and synthesis method and application thereof

A synthesis method and nanowire technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of not having MFI structure, achieve good economic and social benefits, and reduce environmental pollution.

Active Publication Date: 2014-04-30
FUDAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, it has been reported in the literature that iron can catalyze the preparation of silica nanowires under hydrothermal conditions, but this silica nanowire is not a molecular sieve and does not have an MFI structure.

Method used

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  • Fe2O3/Silicalite-1 molecular sieve nanowire and synthesis method and application thereof
  • Fe2O3/Silicalite-1 molecular sieve nanowire and synthesis method and application thereof
  • Fe2O3/Silicalite-1 molecular sieve nanowire and synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 5g Fe(NO 3 ) 3 9H 2 O is dissolved in 10g of water, and then adding a weight concentration of 25% ammonia solution until the pH is 7.5, then adding 10g of a weight concentration of 40% silica sol to form a slurry, the slurry is spray-dried, and the obtained powder is 550 in a rotary furnace o C was roasted for 4h to obtain Fe 2 o 3 / SiO2 . 1g Fe 2 o 3 / SiO 2 , 9.5g of ethylenediamine, 3.5g of triethylamine and 1.9g of water are mixed, stirred evenly and put into a hydrothermal kettle for 200 o C was crystallized for 6 days, and the sample was subjected to 550 o C air atmosphere roasting 4h. Put 0.5 g of the above catalyst into a quartz tube with an inner diameter of 8 mm, first at 500 o Pretreatment in C helium atmosphere for 2h, and then pass N 2 The mixed gas of O and He reacts, and the gas hourly space velocity of the mixed gas is 4800 h -1 , N 2 The O concentration is 5000 ppm, and the reaction temperature is 450 o C, N 2 The O decomposition rate is 2...

Embodiment 2

[0033] 6.5g Fe(NO 3 ) 3 9H 2 O is dissolved in 10g of water, then adding weight concentration is 15% ammonia solution until PH is 7, then adding 10g weight concentration is 40% silica sol to form slurry, slurry is carried out spray drying, the powder that obtains is in rotary furnace 500 o C was roasted for 4h to obtain Fe 2 o 3 / SiO 2 . 1g Fe 2 o 3 / SiO 2 , 7.5g of ethylenediamine, 2.5g of triethylamine and 2.5g of water are mixed, stirred evenly and put into a hydrothermal kettle for 190 o C was crystallized for 12 days, and the sample was subjected to 550 o C air atmosphere roasting 4h. Reaction evaluation condition is the same as embodiment 1, reaction temperature 450 o C, N 2 The O decomposition rate is 38.5%, and the reaction temperature is 500 o C and above, N 2 O decomposition rate reaches 100%.

Embodiment 3

[0035] 6g NH 4 Fe(SO 4 ) 2 12H 2 O is dissolved in 10g of water, then adding weight concentration is 25% ammonia solution until PH is 8, then adding 12g weight concentration is 40% silica sol to form slurry, slurry is carried out spray drying, the powder that obtains is in rotary furnace 550 o C was roasted for 4h to obtain Fe 2 o 3 / SiO 2 . 1g Fe 2 o 3 / SiO 2 . o C was crystallized for 8 days, and the sample was subjected to 550 o C air atmosphere roasting 4h. Reaction evaluation condition is the same as embodiment 1, reaction temperature 450 o C, N 2 The O decomposition rate is 35.6%, and the reaction temperature is 500 o C and above, N 2 O decomposition rate reaches 100%.

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Abstract

The invention belongs to the technical field of chemical catalysts, and particularly relates to a Fe2O3 / Silicalite-1 molecular sieve nanowire and a synthesis method and application thereof. The Fe2O3 / Silicalite-1 molecular sieve nanowire with an MFI structure is synthesized by adopting a hydrothermal crystallization method through using Fe2O3 / SiO2 as a precursor and ethylenediamine and triethylamine as template agents; and the Fe2O3 is highly dispersed on a Silicalite-1 nanowire, and the particle size of the Fe2O3 is less than 5nm. The Fe2O3 / Silicalite-1 molecular sieve nanowire is used in direct decomposition reaction of N2O, good activity is obtained, and the decomposition rate of the N2O at a temperature of 500 DEG C reaches 100 percent.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, in particular to a Fe 2 o 3 / Silicalite-1 molecular sieve nanowire and its synthesis method and in N 2 Applications in O decomposition. Background technique [0002] Silicalite-1 is a SiO with MFI structure 2 Molecular sieves, with a pore size of 0.51 nm to 0.54 nm, have high thermal stability and strong hydrophobicity, so Silicalite-1 has been widely used in scientific research and industry. At present, there are more applications in two aspects. On the one hand, titanium silicalite (Titanium Silicalite-1) is synthesized by replacing a part of silicon in Silicalite-1 with titanium. Titanium silicalite is mainly used for H 2 o 2 As an oxidant, select catalytic oxidation reactions (such as: the reaction of secondary alcohol oxidation to prepare ketones, the epoxidation reaction of olefins); on the other hand, the application of Silicalite-1 molecular sieve membrane, because Silical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/035B01D53/86B01D53/56
CPCY02C20/10
Inventor 谢鹏飞马臻刘田程彦虎杨新玲李璀灿徐欣华伟明乐英红高滋刘惠章
Owner FUDAN UNIV