Preparation method of cubic Nb-CeO2 material as well as product and application thereof

A technology of cube and catalytic material, which is applied in catalyst activation/preparation, combustion method, catalyst carrier, etc., can solve the problems of inconvenient operation, expensive niobium source, difficult to have morphology and structure of niobium-ceria composite oxide, etc. The effect of doping, high niobium content, simple and novel method

Inactive Publication Date: 2019-04-05
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the currently used niobium sources are more expensive, and niobium ethoxide is generally used for doping Nb components. This niobium source is expensive and decomposes when it meets water and oxygen, and it is inconvenient to operate; at the same time, the formed niobium-cerium oxide composite oxide is difficult to have Regular morphology limits its application

Method used

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  • Preparation method of cubic Nb-CeO2 material as well as product and application thereof
  • Preparation method of cubic Nb-CeO2 material as well as product and application thereof
  • Preparation method of cubic Nb-CeO2 material as well as product and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A cubic Nb-CeO 2 The preparation method of the material is to disperse the sodium cerium hydroxide prepared by the hydrothermal method in the niobium oxalate solution, and after the solvent is completely evaporated, it is placed in a muffle furnace and roasted together to obtain Nb-CeO 2 Composite oxides, according to the following steps:

[0036]Weigh 4.34g of cerium nitrate hexahydrate into a 50 mL beaker, add 20 mL of deionized water, stir and dissolve to obtain solution A; weigh 48g of sodium hydroxide into a 100 mL beaker, add 50 mL of deionized water, heat and stir to dissolve Solution B is obtained. Under vigorous stirring, solution A was added dropwise to solution B to form milky C. The milky C was transferred to a 100mL hydrothermal reactor, and the hydrothermal reactor was placed in an oven at 120°C for 36h. After the reaction was completed, the precipitate D was filtered, washed several times, and dried to obtain powder E. Weigh 5.38g of niobium oxalate a...

Embodiment 2

[0038] A cubic Nb-CeO 2 The preparation method of material is similar to embodiment 1, as follows:

[0039] Weigh 4.34g of cerium nitrate hexahydrate into a 50 mL beaker, add 20 mL of deionized water, stir and dissolve to obtain solution A; weigh 48g of sodium hydroxide into a 100 mL beaker, add 50 mL of deionized water, heat and stir to dissolve Solution B is obtained. Under vigorous stirring, solution A was added dropwise to solution B to form milky C. The milky C was transferred to a 100mL hydrothermal reactor, and the hydrothermal reactor was placed in an oven at 150°C for 48 hours. After the reaction was completed, the precipitate D was filtered, washed several times, and dried to obtain powder E. Weigh 5.38g of niobium oxalate and place it in a 500mL beaker, add 200mL of deionized water, stir to dissolve, then add water to a 1000mL volumetric flask to obtain solution F, take 25mL of solution F, and under strong stirring, mix 1.5g of powder E Add to solution F. Heat ...

Embodiment 3

[0041] A cubic Nb-CeO 2 The preparation method of material is similar to embodiment 1, as follows:

[0042] Weigh 4.34g of cerium nitrate hexahydrate into a 50 mL beaker, add 20 mL of deionized water, stir and dissolve to obtain solution A; weigh 48g of sodium hydroxide into a 100 mL beaker, add 50 mL of deionized water, heat and stir to dissolve Solution B is obtained. Under vigorous stirring, solution A was added dropwise to solution B to form milky C. The milky C was transferred to a 100mL hydrothermal reactor, and the hydrothermal reactor was placed in an oven at 130°C for 48 h. After the reaction was completed, the precipitate D was filtered, washed several times, and dried to obtain powder E. Weigh 5.38g of niobium oxalate and place it in a 500mL beaker, add 200mL of deionized water, stir to dissolve, then add water to a 1000mL volumetric flask to obtain solution F, take 25mL of solution F, and under strong stirring, mix 1.5g of powder E Add to solution F. Heat in a...

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Abstract

The invention provides a preparation method of a cubic Nb-CeO2 material. The preparation method comprises the following steps: absorbing niobium oxalate by virtue of cerium hydroxide, directly roasting, dispersing sodium cerium hydroxide prepared in a hydrothermal method in a niobium oxalate solution, completely evaporating the solvent, roasting in a muffle furnace to obtain Nb-CeO2 composite oxide. The prepared material contains 1 to 10 percent of Nb2O5 and 90 to 99 percent of CeO2 and has cubic morphology. By adopting the method disclosed in the invention, the niobium oxide can more sufficiently form the composite oxide with cerium oxide, so that the modification effect for the cerium oxide can be improved, and the preparation method is further applied to various catalytic reactions.

Description

technical field [0001] The invention relates to a cubic Nb-CeO 2 The preparation method of the material and its products and applications belong to the field of new material preparation and industrial catalysis and environmental protection. The material can be used as a catalyst or a carrier. Background technique [0002] Cerium oxide is a typical cubic fluorite structure. CeO 2 The crystal structure is stable, Ce is variable in price, and has intrinsic defects. Ce in its lattice 3+ and Ce 4+ It can be transformed into each other and can be used as a carrier and a catalyst. by sending CeO 2 The addition of additives produces lattice defects and promotes the migration of oxygen species, further improving the application performance of cerium oxide. In catalytic reactions, vanadium is commonly used as a cerium oxide additive. Although the vanadium-ceria material yields good performance, vanadium is toxic and causes great environmental pollution. Niobium and vanadium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J37/10B01J37/08B01J32/00B01J23/68B01J37/03F23G7/07
CPCB01J32/00B01J23/002B01J23/20B01J23/682B01J37/035B01J37/086B01J37/10F23G7/07
Inventor 何丹农袁静张晓岚刘喆蔡婷赵昆峰徐荣金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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