Alpha-Fe2O3 nanorod and Au/alpha-Fe2O3 catalyst, and synthesis and application thereof

A nanorod and catalyst technology, which is applied in the field of porous α-Fe2O3 nanorods and their synthesis, can solve the problems of decreased dispersion and easy sintering of Au nanoparticles at high temperature, and achieves improved thermal stability and dispersion, environmental friendliness, and obvious advantages. The effect of size effect

Inactive Publication Date: 2017-08-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention provides to utilize above-mentioned α-Fe 2 o 3 Nanorods regulate the size and shape of Au nanoparticles, and solve the problem of Au nanoparticles being easy to sinter at high temperature and the degree of dispersion decreases

Method used

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  • Alpha-Fe2O3 nanorod and Au/alpha-Fe2O3 catalyst, and synthesis and application thereof
  • Alpha-Fe2O3 nanorod and Au/alpha-Fe2O3 catalyst, and synthesis and application thereof
  • Alpha-Fe2O3 nanorod and Au/alpha-Fe2O3 catalyst, and synthesis and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 5.408g FeCl 3 ·6H 2 O, 11.6g NaCl, 10mL PEG were added to 190mL water, stirred and heated to 120°C; then 200mL 0.2mol / L Na 2 CO 3 After the solution was added to the above solution at a speed of 0.55mL / min (6 hours), continue to stir and age for 1 hour; adjust the pH to 8.0-12.0, filter, wash and dry the aged product, and store it at 500°C Roasted for 5 hours to obtain solid powder. Analyzed as α-Fe by XRD 2 o 3 crystal phase, its XRD spectrum is shown in figure 1 a; TEM images are shown in figure 2 . The results showed that the synthesized α-Fe 2 o 3 The sample has a nanorod structure with a diameter of 40-50nm and a length of 300-500nm, and its specific surface area is 79m 2 / g, the average pore diameter is about 20nm.

Embodiment 2

[0049] Get the 1gα-Fe obtained in the implementation case 1 2 o 3 Nanorods dispersed in 300mL containing HAuCl 4 (4.9×10 -4 mol / L) in the aqueous solution, after heating to 80°C, add 60mL of 0.01mol / L Na 2 CO 3 solution, adjust the pH to 5.9. After aging at this temperature for 1 h, after filtering, washing, and drying at 120° C. for 12 h, a solid precursor was obtained. Calcined Au / α-Fe at 300℃ in air for 5h 2 o 3 The catalyst is labeled Au-300, where the loading of Au is 1.6 wt.%. Its XRD spectrum and TEM pictures are shown in figure 1 b and image 3 a; the diameter of the carrier nanorod is 40-50nm, and the length is 300-500nm; the average size of the Au nanoparticles is 2.2nm, further passed through HRTEM ( image 3 b) The analysis revealed that the Au nanoparticles are mainly two-dimensional thin layered structures.

Embodiment 3

[0051] The solid precursor in Example 2 was calcined at 400°C for 5 hours, and the resulting sample was labeled Au-400, and its XRD spectrum and TEM pictures are shown in figure 1 c and Figure 4 a; α-Fe 2 o 3 The morphology and crystal phase of the carrier remain unchanged; the average size of Au nanoparticles is 3.5nm, and its morphology is mainly three-dimensional truncated octahedron ( Figure 4 b).

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Abstract

The invention discloses an alpha-Fe2O3 nanorod and an Au / alpha-Fe2O3 catalyst, and synthesis and application thereof. The alpha-Fe2O3 maintains a porous nanorod-shaped structure, and the average size of an Au particle is increased to 8.6nm from 2.2nm. Meanwhile, the alpha-Fe2O3 nanorod-shaped structure can also modulate a morphology of an Au nanometer particle, and the morphologies of the Au nanometer particles on the Au / alpha-Fe2O3 catalyst roasted at the temperature of 300, 400 and 500 DEG C respectively are respectively a two-dimensional thin stratified structure, three-dimensional truncated octahedron and a schistose truncated octahedron, so that the peculiarity of the alpha-Fe2O3 rod-shaped structure on dispersing and stabilizing the Au nanometer particles is embodied. The prepared Au / alpha-Fe2O3 catalyst can catalyze CO oxidation at room temperature, and the reaction rate reaches to 0.8047mol CO / gAuh.

Description

technical field [0001] The invention relates to a porous α-Fe 2 o 3 Nanorods and methods for their synthesis. [0002] The present invention relates to a kind of α-Fe 2 o 3 Supporting Au Nanoparticle Catalysts and Controlling Au / α-Fe 2 o 3 Synthesis of Au Nanoparticle Topography on Catalysts. [0003] The present invention relates to a kind of Au / α-Fe 2 o 3 Application of catalytic carbon monoxide oxidation reaction at room temperature. Background technique [0004] α-Fe 2 o 3 With excellent redox performance and crystal phase stability, it is widely used as a catalyst support for metal nanoparticles. For example, Au / α-Fe 2 o 3 The catalyst exhibits excellent performance in catalytic CO oxidation reaction through the interaction between metal and support [Chem. ,2013,3,2881]. Numerous studies have shown that α-Fe 2 o 3 The shape and size of the Au / α-Fe 2 o 3 One of the key factors of catalyst performance; such as G.H.Wang et al. supported Au nanoparticles ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B01J23/89B82Y30/00B82Y40/00C01B32/50
CPCB01J23/8906B82Y30/00B82Y40/00C01G49/06C01P2002/72C01P2004/04C01P2004/16C01P2006/12C01P2006/16
Inventor 申文杰魏雪姣周燕李勇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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