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Palladium oxide supported zinc-based catalyst and preparation method and application thereof

A palladium oxide and catalyst technology, which is applied in the field of catalytic combustion of organic gas pollutants, can solve problems such as poor stability, high catalyst cost, and low palladium loading, and achieve the effects of low loading, good dispersion, and high solution cost

Active Publication Date: 2021-10-26
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of high catalyst cost and poor stability faced by traditional supported palladium catalysts for methane combustion, a palladium oxide supported zinc-based catalyst with simple preparation process, low palladium loading, high activity and stability is provided, so as to obtain Excellent activity and high temperature stability

Method used

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  • Palladium oxide supported zinc-based catalyst and preparation method and application thereof
  • Palladium oxide supported zinc-based catalyst and preparation method and application thereof
  • Palladium oxide supported zinc-based catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] At room temperature, 50 mmol of zinc acetate and 5 mmol of zinc nitrate were completely dissolved in 80 mL of absolute ethanol by stirring to obtain a clear and transparent solution, which was then transferred to a polytetrafluoroethylene reactor, sealed with a stainless steel outer lining, and placed in an oven for 150 o C was reacted for 5 h, and after naturally cooling to room temperature, the resulting product was filtered, washed, and dried to obtain the zinc oxide carrier. The prepared zinc oxide sample of 1g was added into 100ml deionized water under stirring, and then dripped with a concentration of 0.005g / ml palladium nitrate solution (the weight percentage of palladium oxide was 0.4%), at 40 o C ultrasonication for 1 hour, the ultrasonic frequency is 20kHz, and the ultrasonic power is 150W, the resulting product is filtered, washed, and placed in an oven at 80 o C drying treatment for 5 hours, placed in a muffle furnace at 500 o C is calcined for 2 hours to o...

Embodiment 2

[0038] At room temperature, 50 mmol of zinc acetate and 5 mmol of zinc nitrate were completely dissolved in 80 mL of absolute ethanol by stirring to obtain a clear and transparent solution, which was transferred to a polytetrafluoroethylene reactor, sealed with a stainless steel outer lining, and placed in an oven for 150 o C was reacted for 5 h, and after naturally cooling to room temperature, the resulting product was filtered, washed, and dried to obtain the zinc oxide carrier. The prepared zinc oxide sample of 1g was added into 100ml deionized water under stirring, and then dripped with a concentration of 0.005g / ml palladium nitrate solution (the weight percentage of palladium oxide was 0.2%), at 40 o C ultrasonic 2 hours, ultrasonic frequency is 20kHz, ultrasonic power is 150W, gained product is filtered, washed, in oven 80 o C drying treatment for 5 hours, placed in a muffle furnace at 500 o C is calcined for 2 hours to obtain palladium oxide supported zinc-based cataly...

Embodiment 3

[0040]At room temperature, 50 mmol of zinc acetate and 5 mmol of zinc nitrate were completely dissolved in 80 mL of absolute ethanol by stirring to obtain a clear and transparent solution, which was then transferred to a polytetrafluoroethylene reactor, sealed with a stainless steel outer lining, and placed in an oven for 150 o C was reacted for 5 h, and after naturally cooling to room temperature, the resulting product was filtered, washed, and dried to obtain the zinc oxide carrier. The prepared zinc oxide sample of 1g was added into 100ml deionized water under stirring, and then dripped with a concentration of 0.005g / ml palladium chloride solution (the weight percentage of palladium oxide was 0.6%), at 40 o C ultrasonication for 1 hour, the ultrasonic frequency is 20kHz, and the ultrasonic power is 150W, the resulting product is filtered, washed, and placed in an oven at 80 o C drying treatment for 5 hours, placed in a muffle furnace at 500 o C is calcined for 2 hours to o...

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Abstract

The invention discloses a palladium oxide supported zinc-based catalyst and a preparation method thereof, which belong to the field of catalytic combustion of organic gas pollutants. The catalyst carrier is zinc oxide with the particle size of 150-300 nm, the loaded precious metal palladium exists in the form of oxide, the particle size is mainly distributed in the range of 1.5-2.5 nm, the loading amount of the palladium oxide accounts for 0.2-0.6% by mass of the catalyst, and the palladium oxide is uniformly dispersed on the surface of the zinc oxide carrier. According to the catalyst, loading of palladium oxide on a zinc oxide carrier is achieved through an ultrasonic-roasting two-step method, compared with an existing palladium-based methane catalytic combustion catalyst, the catalyst has the advantages of being low in palladium loading capacity, high in activity and stability, simple in preparation process and easy to apply and popularize.

Description

technical field [0001] The invention relates to a palladium oxide-loaded zinc-based catalyst, a preparation method and application thereof, and belongs to the field of catalytic combustion of organic gas pollutants. Background technique [0002] Natural gas is an important chemical raw material and clean energy, which has very broad development and application prospects. As the main component of natural gas, methane has a high degree of tetrahedral symmetry and is extremely difficult to be activated under mild conditions (the bond energy of its C-H bond is as high as 434 KJ / mol). In research at home and abroad, the supported palladium catalyst is one of the best methane combustion catalysts at present, but the high temperature during use will lead to the sintering deactivation of the palladium species, reducing the performance and service life of the catalyst. In addition, the price of palladium metal Expensive, and today's supported palladium catalysts use a relatively hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J32/00C10L10/00C10L3/00
CPCB01J23/60C10L10/00C10L3/003C10L2230/04
Inventor 左莹魏学红张婷
Owner SHANXI UNIV
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