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High oxygen storage cerium-zirconium solid solution prepared by adopting tobacco plant as template, and preparation method thereof

A cerium-zirconium solid solution and tobacco plant technology, applied in the field of high oxygen storage cerium-zirconium solid solution catalyst and its preparation, to achieve stable performance, good economic and social benefits, and low production costs

Active Publication Date: 2015-11-04
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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  • High oxygen storage cerium-zirconium solid solution prepared by adopting tobacco plant as template, and preparation method thereof
  • High oxygen storage cerium-zirconium solid solution prepared by adopting tobacco plant as template, and preparation method thereof
  • High oxygen storage cerium-zirconium solid solution prepared by adopting tobacco plant as template, and preparation method thereof

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, wherein the microstructure is copied from the microstructure of tobacco plant tissue in the morphology. The invention further relates to a cerium-zirconium solid solution preparation method, which comprises: (1) soaking a tobacco plant with hydrochloric acid, and carrying out filtration dehydration to prepare a tobacco plant template; (2) soaking the tobacco plant template prepared in the step (1) with a precursor solution, wherein the precursor solution is an aqueous solution or ethanol solution containing a cerium source, a zirconium source and a complexing agent (or precipitation agent); (3) filtering the mixture in the step (2), retaining the solid, and drying to obtain the initial solid product; and (4) calcining the solid product (4) obtained in the step (3) to obtain the cerium-zirconium solid solution. According to the present invention, the prepared cerium-zirconium solid solution has characteristics of nanometer fine structure, large specific surface area and high oxygen storage capacity, and the cerium-zirconium solid solution preparation method has characteristics of simple process, easy operation, low reaction condition, low production cost, high production efficiency, and good industrial production prospect.

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 Applications(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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