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Methods of preparing metal / metal oxide materials from nanostructured substrates and uses thereof

A technology of nanostructures and oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, alkali metal compounds, chemical instruments and methods, etc., can solve problems such as high catalytic starting temperature, unclear structure, etc.

Active Publication Date: 2016-12-14
THE UNIV OF BRITISH COLUMBIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of Pd / CeO 2 These approaches to structures and other metal / metal oxide composites often lead to ill-defined structures and relatively high catalytic onset temperatures

Method used

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  • Methods of preparing metal / metal oxide materials from nanostructured substrates and uses thereof
  • Methods of preparing metal / metal oxide materials from nanostructured substrates and uses thereof
  • Methods of preparing metal / metal oxide materials from nanostructured substrates and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 1: Synthesis of rod-shaped basic cerium carbonate ("CHC-f")

[0102] Cerium nitrate hexahydrate (0.87 g, 0.002 mol) was added to ethylene glycol ("EG") (15 mL) in a 23 mL Teflon-lined stainless steel autoclave. The sealed reaction mixture was kept in a hot air oven at 453 K for 48 h, then left to cool to room temperature. The pale yellow gel-like product was centrifuged at 4500 rpm for 10 min, washed with ethanol (3×20 mL), and dried at 323K. The PXRD pattern of the tan product matched that of cerium basic carbonate (JCPDS-52-0352). Key peak in FTIR spectrum: CO 3 2- Peak: 1480cm -1 、1401cm -1 、1080cm -1 、864cm -1 、841cm -1 . A reaction temperature of about 443K to 463K yields CHC-f nanostructures.

Embodiment 2

[0103] Example 2: Synthesis of hollow spherical cerium formate ("CF")

[0104] Cerium nitrate hexahydrate (0.87 g, 0.002 mol) was added to EG (15 mL) in a 23 mL Teflon-lined stainless steel autoclave. The sealed reaction vessel was heated at 418K for 15h. The obtained purple product was centrifuged at 4500 rpm for 10 min, washed with ethanol (3×20 mL), and dried at 323K overnight to obtain a light purple powder. The PXRD pattern of this product was consistent with cerium formate (JCPDS 49-1245). Key peak in FTIR spectrum: 1570cm -1 、1401cm -1 、1349cm -1 、776cm -1 . A reaction temperature of about 413K to 423K yields CF hollow nanospheres.

Embodiment 3

[0105] Example 3: Synthesis of Flake Basic Cerium Carbonate ("CHC")

[0106]Cerium nitrate hexahydrate (0.87 g, 0.002 mol) was added to EG (15 mL) in a 23 mL Teflon-lined stainless steel autoclave. The sealed reaction vessel was heated at 473K for 24h. The resulting product was centrifuged at 4500 rpm for 10 min, washed with ethanol (3×20 mL), and dried at 323K overnight. The white solid gave a PXRD pattern for basic cerium carbonate (JCPDS-52-0352). Key peak in FTIR spectrum: 1521cm -1 、1430cm -1 、1403cm -1 、1082cm -1 、871cm -1 、847cm -1 . A reaction temperature of about 473K to 493K gives CHC with a sheet-like structure.

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Abstract

The invention provides a method of preparing a metal / metal oxide material. In one aspect, a nanostructure is provided, the nanostructure comprising a first metal to form the metal oxide, and a reaction surface with a reducing agent on the reaction surface. A second metal is deposited onto the reaction surface to form a bimetallic product. The bimetallic product is calcined to form the metal / metal oxide material.

Description

technical field [0001] The present invention relates to nanostructures, their applications and their preparation methods. In particular, the present invention relates to methods of preparing metal / metal oxide materials from nanostructured matrices. Background technique [0002] Natural gas due to producing less CO per unit of energy 2 And provide clean energy to replace gasoline and diesel. However, management of unburned methane from natural gas engines and industrial emissions is receiving increasing attention because methane is a potent greenhouse gas with a global warming potential greater than that of CO. 2 20 times. Existing three-way catalytic converters currently used in vehicles are poor at oxidizing methane, but Pd / CeO 2 The composite material can efficiently oxidize methane. These are usually formed by wet impregnation methods, but other methods are known including co-precipitation, deposition-precipitation, specific adsorption and combustion synthesis. Prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/02B01J23/00B82Y30/00C01B13/14C01B13/18C01D7/00
CPCB82Y30/00C01B13/18B01J23/63B01J37/0201B01J23/66B01J37/0203B01J37/0209B01J37/16Y02C20/20B01J35/23B01J35/613B01D53/8668B01D53/94B01D2255/40B01D2257/7025B01D2258/018B01D2258/0283B01J37/0225B01J37/08
Inventor M·麦克拉克伦M·沃尔夫G·安安哈娜塔拉让
Owner THE UNIV OF BRITISH COLUMBIA