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A method for post-loading nanometals to prepare continuous SIO2/nanometal airgel fibers with catalytic properties

An aerogel fiber, nano-metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of inconvenient use, low catalyst utilization, contact Area reduction and other problems, to achieve the effect of adjustable load, rich holes, and simple reaction process

Active Publication Date: 2018-09-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with zero-dimensional powder, the powder will stack without external support materials and external force, the contact area with ethanol vapor is greatly reduced, and the utilization rate of the catalyst stacked in the middle is very low
In addition, the powder form is not convenient to use, especially in the field of liquid catalysis
Current research on continuous SiO with catalytic properties 2 / The literature of nano metal airgel fiber has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Sodium water glass with a modulus of 2 and 50 Baume degrees was used as the spinning stock solution, and 0.8 mol / L dilute sulfuric acid solution was used as the coagulation bath to carry out reactive wet spinning. The orthosilicic acid / silicate fiber formed in the coagulation bath was wound at a winding speed of 0.1 m / s. The wound fiber was immersed in 0.005mol / L dilute sulfuric acid for 10 days for aging, so as to realize the transformation from orthosilicic acid / silicate fiber to SiO 2 The fibers are transformed, and a large number of holes are formed at the same time. After aging, the fibers were washed with deionized water until neutral. SiO will be obtained 2 The porous fibers were immersed in 0.01mol / L AgNO 3 In the solution for 10min, take it out, remove the surface solvent, and immerse in 0.05mol / L NaBH 4 Solution (need to use NaOH to adjust the pH to 12) for 10min, remove the surface solvent, repeat AgNO 3 The solution and the reducing agent solution are i...

Embodiment 2

[0033] Potassium water glass with a modulus of 3 and 35 Baume degrees is used as the spinning stock solution, and 0.2mol / L dilute sulfuric acid solution is used as the coagulation bath to carry out reactive wet spinning. The orthosilicic acid / sodium silicate fiber formed in the coagulation bath was wound at a winding speed of 0.5 m / s. The wound fiber was immersed in 0.005mol / L dilute sulfuric acid for 10 days for aging, so as to realize the transformation from orthosilicic acid / silicate fiber to SiO 2 The fibers are transformed, and a large number of holes are formed at the same time. After aging, the fibers were washed with deionized water until neutral. The obtained SiO2 porous fiber was immersed in 0.01mol / L CuSO 4 In the solution for 10 minutes, take it out, remove the surface solvent, and immerse in 0.1mol / L ascorbic acid solution (need to use H 2 SO 4 Adjust the pH to 3) for 10min, remove the surface solvent, repeat CuSO 4 The solution and the reducing agent solutio...

Embodiment 3

[0035] Potassium water glass with a modulus of 3 and 35 degrees Baume was used as the spinning stock solution, and 0.8 mol / L dilute sulfuric acid solution was used as the coagulation bath to carry out reactive wet spinning. The orthosilicic acid / potassium silicate fiber formed in the coagulation bath was wound at a winding speed of 1 m / s. The wound fiber was immersed in 0.1mol / L dilute sulfuric acid for 5 days for aging, and the transformation from orthosilicic acid / silicate fiber to SiO 2 The fibers are transformed, and a large number of holes are formed at the same time. After aging, the fibers were washed with deionized water until neutral. SiO will be obtained 2 The porous fibers were immersed in 0.01mol / L AgNO 3 In the solution for 10 minutes, take it out, remove the surface solvent, immerse in 0.05mol / L hydrazine hydrate solution (need to use NaOH to adjust the pH to 10) for 10 minutes, remove the surface solvent, repeat AgNO 3 The solution and the reducing agent sol...

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Abstract

The invention relates to a method for preparing continuous SiO2 / nano-metal aerogel fibers with a catalysis performance through finally loading a nano-metal. The method comprises the following steps: processing silicate or silanol sol to prepare a spinning stock solution; adding an acidic solution to a coagulation tank to form a coagulation bath; and injecting the spinning stock solution to the coagulation bath, carrying out reaction wet spinning to obtain orthosilicic acid / silicate fibers, reeling the orthosilicic acid / silicate fibers, ageing the reeled orthosilicic acid / silicate fibers, washing the aged orthosilicic acid / silicate fibers with deionized water until neutrality, immersing the neutral orthosilicic acid / silicate fibers in a metal salt solution, taking out the immersed fibers, removing a solvent on the surface of the orthosilicic acid / silicate fibers, immersing the obtained fibers in a reducing agent, washing the obtained fibers with deionized water until the fibers are neutral, displacing the fibers with deionized water or ethanol, and drying the displaced fibers to obtain the continuous SiO2 / nano-metal aerogel fibers. The method has the advantages of cheap and easily available raw materials, simple reaction process and good spinnability, and the aerogel fibers obtained in the invention have the advantages of abundant holes, high specific surface area, high temperature resistance, chemical corrosion resistance, and adjustable specific surface area and nano-metal load capacity.

Description

technical field [0001] The invention belongs to the field of preparation of airgel fibers, in particular to a continuous SiO with catalytic performance prepared by post-loading nano metal 2 / Nanometal airgel fiber method. Background technique [0002] In a chemical reaction, a substance that can change the chemical reaction rate of the reactants (both increase and decrease) without changing the chemical balance, and whose quality and chemical properties have not changed before and after the chemical reaction is called a catalyst. In actual production, catalysts tend to be more expensive. In order to reduce the amount of catalyst as much as possible and improve the efficiency of the catalyst, it is often necessary to enlarge its specific surface and make it into nanoparticles. In order to support the active components and make the catalyst have specific physical properties, the catalyst is often loaded on a porous material with open pores that can realize the internal trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/06
CPCB01J21/08B01J23/50B01J35/06B01J35/1019B01J35/1023B01J35/1061
Inventor 朱美芳孟思陈文萍成艳华
Owner DONGHUA UNIV
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