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A kind of cerium-zirconium solid solution with high oxygen storage capacity prepared by using tobacco plant as a template and its preparation method

A cerium zirconium solid solution, tobacco plant technology, applied in separation methods, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of stable performance, low production cost, and easy control of the reaction process

Active Publication Date: 2018-04-17
CHINA TOBACCO YUNNAN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, the method of using tobacco plants as templates to prepare cerium-zirconium solid solutions with excellent properties has never been reported.

Method used

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  • A kind of cerium-zirconium solid solution with high oxygen storage capacity prepared by using tobacco plant as a template and its preparation method
  • A kind of cerium-zirconium solid solution with high oxygen storage capacity prepared by using tobacco plant as a template and its preparation method
  • A kind of cerium-zirconium solid solution with high oxygen storage capacity prepared by using tobacco plant as a template and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] After removing the stem strips from the tobacco leaves after initial baking, they are cut into blades with a length of 1-2 cm and a width of 0.2 cm. Weighing 10 g of the leaf was soaked in 5% HCl for 3 days, filtered, and dehydrated through an absolute ethanol gradient to obtain a tobacco plant template. In a beaker, use 15g of precursor solution (the molar ratio of Ce(NO 3 ) 3 :ZrO(NO 3 ) 2 : citric acid=0.5:0.5:4, just dissolved in water) mixed and soaked for 3 days. After filtration, the leaves doped with cerium-zirconium solid solution were obtained, dried at room temperature and then dried in an oven at 90° C. for one day to obtain the initial solid product. The obtained solid product is put into a muffle furnace and calcined at a high temperature of 500° C. to obtain a cerium-zirconium solid solution.

[0037] figure 1 It is the SEM image of the prepared cerium-zirconium solid solution. It can be clearly seen from the figure that the as-prepared cerium-zirc...

Embodiment 2

[0041] Remove the stalks from the leaves of the tobacco leaves after initial roasting, cut the stalks into 1-2 cm long, weigh 10 g, soak in 5% HCl for 3 days, filter, and dehydrate through absolute ethanol gradient to obtain a tobacco plant template. In a beaker, use 15g of precursor solution (the molar ratio of Ce(NO 3 ) 3 :ZrO(NO 3 ) 2 : tartaric acid=0.5:0.5:4, just dissolved in water) mixed and soaked for 3 days. After filtration, the stalk doped with cerium-zirconium solid solution was obtained, dried at room temperature and then dried in an oven at 90° C. for one day to obtain the initial solid product. The obtained solid product is put into a muffle furnace and calcined at a high temperature of 500° C. to obtain a cerium-zirconium solid solution. The prepared cerium-zirconium solid solution was treated with H 2 - After TPR test, with Cu 2 O calibration to calculate the hydrogen consumption, the calculated oxygen storage capacity of the cerium-zirconium solid solut...

Embodiment 3

[0043] Tobacco leaves (including leaves and stalks) after primary roasting are made into shredded tobacco after expansion technology, 10 g is weighed, soaked in 5% HCl for 2 days, filtered, and dehydrated by dehydrated ethanol gradient to obtain a tobacco plant template. In a beaker, use 15g of precursor solution (the molar ratio of Ce(NO 3 ) 3 :ZrO(NO 3 ) 2 : ethylenediaminetetraacetic acid=0.5:0.5:4, just dissolved in water) mixed and soaked for 3 days. The tobacco leaves doped with the cerium-zirconium solid solution were obtained by filtration, dried at room temperature and then dried in an oven at 90° C. for one day to obtain the initial solid product. The obtained solid product is put into a muffle furnace and calcined at a high temperature of 500° C. to obtain a cerium-zirconium solid solution. The prepared cerium-zirconium solid solution was treated with H 2 - After TPR test, with Cu 2 O calibration to calculate the hydrogen consumption, the calculated oxygen sto...

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Abstract

The present invention relates to a cerium-zirconium solid solution whose microstructure is morphologically replicated from that of tobacco plant tissue. The present invention also relates to the preparation method of the cerium-zirconium solid solution, which comprises the following steps: (1) soaking the tobacco plants with hydrochloric acid and then filtering and dehydrating to obtain a tobacco plant template; The tobacco plant template is soaked with a precursor solution, wherein the precursor solution is an aqueous solution or an ethanol solution containing a cerium source, a zirconium source, a complexing agent (or a precipitation agent); (3) filtering the mixture in step (2), and retaining a solid and drying it to obtain an initial solid product; (4) calcining the solid product obtained in step (3) to obtain a cerium-zirconium solid solution. The cerium-zirconium solid solution prepared by the invention has nano fine structure, large specific surface area and high oxygen storage capacity. The preparation method of the cerium-zirconium solid solution has simple process, convenient operation, low reaction conditions, low production cost and high production benefit, and has good industrialized production prospects.

Description

technical field [0001] The invention belongs to the technical field of oxygen storage materials and preparation methods thereof, in particular to a cerium-zirconium solid solution catalyst with high oxygen storage capacity prepared by using tobacco plants as templates and a preparation method thereof. Background technique [0002] Due to its good oxygen storage and release properties and thermal stability, cerium-zirconium solid solution plays an important role in the fields of fuel cells, catalytic combustion of natural gas, catalytic purification of motor vehicle exhaust, and catalytic purification of chlorinated volatile organic compounds (VOCs). The oxygen storage performance and redox performance of cerium-zirconium oxygen storage materials are closely related to the oxygen vacancy concentration of Ce-Zr-O solid solution, the mobility of oxygen vacancies, the surface area and the formation of anion defects. In order to further improve the oxygen storage capacity of ceri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J23/10B01J35/02B01J35/10B01D53/94B01J35/00
Inventor 韩熠朱东来张伟巩效伟李寿波张霞王家强王伟和佼
Owner CHINA TOBACCO YUNNAN IND
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