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Platinum-loaded nano cage-shaped zirconium oxide-cobaltosic oxide solid solution as well as preparation and application thereof in toluene thermocatalytic treatment

A technology of tricobalt tetroxide and zirconia, applied in metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, gas treatment, etc., can solve problems such as differential thermal stability, and achieve uniform pore size and controllable structure , Increase the effect of reactive active sites

Active Publication Date: 2020-09-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are several major defects in pure Co3O4 nanocrystals, one of which is poor thermal stability

Method used

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  • Platinum-loaded nano cage-shaped zirconium oxide-cobaltosic oxide solid solution as well as preparation and application thereof in toluene thermocatalytic treatment
  • Platinum-loaded nano cage-shaped zirconium oxide-cobaltosic oxide solid solution as well as preparation and application thereof in toluene thermocatalytic treatment
  • Platinum-loaded nano cage-shaped zirconium oxide-cobaltosic oxide solid solution as well as preparation and application thereof in toluene thermocatalytic treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 The preparation of nano-cage zirconia-cobalt tetroxide solid solution, the specific steps are as follows:

[0037] CuSO 4 ∙5H 2 O (1.5 mmol) was dissolved in 80 ml of ultrapure water, then sodium citrate (0.5 mmol) was added to the above solution with stirring; then, another 20 ml of NaOH (1.25M) was added with stirring and stirred for 15 min , and 50 ml of ascorbic acid (0.03M) was put into the suspension under stirring for 15 min; finally, the obtained mixed solution was aged at 50°C for 1 h; the precipitate was collected by centrifugation and washed three times with ultrapure water and ethanol , dried to obtain Cu 2 O Nanocube.

[0038] At room temperature, 25 mg of Cu prepared above 2 O nanocubes, 1 mg ZrOCl 2 ·8H 2 O and 15 mg CoCl 2 ∙6H 2 O was dispersed in 40 mL of ethanol / HO solvent (volume ratio = 1:1), and 1.33 g of PVP (M w = 40000) sonicated for 20 min. Then, with stirring, 25 mL of 1M Na 2 S 2 o 3 The solution was slowly added dropwi...

Embodiment 2

[0040] Example 2 The preparation of platinum-loaded nano-cage zirconia-cobalt tetroxide solid solution, the specific steps are as follows:

[0041] Pt nanoparticles were successfully prepared onto the support by the ethylene glycol reduction method. 8.06 mg of Pt(acac) 2 and 200mg Zr 0.1 The Co solid solution was added to a mixed solvent containing 30 ml DMF and 20 ml EG, then dispersed by sonication for 20 min and magnetically stirred for 4 h. The obtained suspension was then transferred to a reactor and heated to 160 °C for 12 h. The powder was collected by centrifugation, washed 3 times with ethanol, and then dried in vacuo at 60 °C overnight to obtain 2.0 wt% Pt / Zr 0.1 Co, that is, nano-cage zirconia-cobalt tetroxide solid solution loaded with platinum. replace Pt(acac) 2 The amount of yPt / Zr with theoretical Pt content of y = 0.5, 1.0, 2.0 wt% was prepared 0.1 Co catalyst.

[0042] attached Figure 5 2.0 wt% Pt / Zr 0.1 SEM images of Co composites, attached Figur...

Embodiment 3

[0046] The thermal catalytic conditions of the zirconia-cobalt tetroxide solid solution nanocage composite material loaded with platinum metal nanoparticles to toluene gas are: the concentration of toluene is 50 ppm (air is used as filling gas, purchased from Messer Air Liquide Co., Ltd.), and the amount of catalyst is 50 mg, the catalyst was fixed on a fixed-bed reactor through a U-shaped tube, and the catalytic effect of the composite material on toluene gas under heating conditions was analyzed by gas chromatography, and the test condition was 36000 ml / (h∙g).

[0047] Figure 7 It is the thermocatalytic effect curve figure of zirconia-cobalt tetroxide solid solution to toluene gas; Figure 8 It is a graph showing the thermocatalytic effect of zirconia-cobalt tetroxide solid solution nanocage composites loaded with platinum metal nanoparticles on toluene gas. attached by Figure 8 It can be seen that the present invention can be applied to the conversion of toluene at low...

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Abstract

The invention discloses a platinum-loaded nano cage-shaped zirconium oxide-cobaltosic oxide solid solution as well as preparation and application thereof in toluene thermocatalytic treatment. A zirconium oxide-cobaltosic oxide solid solution nanocage material is prepared by taking a newly prepared cuprous oxide nanocube as a template and zirconium oxychloride octahydrate and cobalt dichloride hexahydrate as metal precursors through ion exchange, etching and calcining; a certain amount of platinum acetylacetonate is added as a metal precursor, and the zirconium oxide-cobaltosic oxide nanocage composite material loaded with a certain amount of platinum is obtained through magnetic stirring, ultrasonic stirring and an ethylene glycol reduction method. The platinum-loaded nano cage-shaped zirconium oxide-cobaltosic oxide solid solution composite material disclosed by the invention has a relatively good thermocatalytic effect on toluene gas, can achieve complete catalytic oxidation of low-concentration toluene at a low temperature. In addition, the use amount of precious metal is small, the cost is saved, and the solid solution has great research significance and a certain application prospect for solving the problem of toluene pollution gas in the air environment.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to the preparation of a platinum-loaded nanocage zirconia-cobalt tetroxide solid solution composite material and its application in toluene thermocatalytic treatment. Background technique [0002] Driven by the environmental pollution caused by the long-term emission of volatile organic compounds (VOCs), especially toluene, there is a call for effective technologies to reduce damage to the environment and human health. Low-temperature catalytic oxidation technology is considered to be an effective and economical method for the removal of toluene, which has attracted widespread attention. [0003] So far, noble metal and transition metal oxide-based supported catalysts are the main catalyst systems for the catalytic oxidation of toluene. Among various noble metal-based catalysts, Pt-based catalysts have attracted much attention due to their excellent catalytic activi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/00B01J35/02B01J35/10B01J37/00B01J37/16B01D53/86B01D53/72
CPCB01J23/8913B01J37/0018B01J37/16B01D53/8668B01D2257/7027B01J35/393B01J35/50B01J35/60
Inventor 路建美陈冬赟蒋军
Owner SUZHOU UNIV
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