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Cerium-zirconium-palladium nanopowder catalyst and preparation and application thereof

A nano-powder and catalyst technology, applied in the field of nano-powder morphology cerium-zirconium-palladium catalyst and its preparation, can solve problems such as process complexity, achieve uniform system structure, no loss of noble metal active component distribution, and high chemical stability sexual effect

Active Publication Date: 2012-09-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the invention relies on the use of hydrogen, and there is a certain degree of complexity in the process

Method used

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  • Cerium-zirconium-palladium nanopowder catalyst and preparation and application thereof
  • Cerium-zirconium-palladium nanopowder catalyst and preparation and application thereof
  • Cerium-zirconium-palladium nanopowder catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh Ce(NO 3 )·6H 2 O 3.4740g, ZrOCl 2 ·8H 2 O 0.6445g was dissolved in 20ml of absolute ethanol, and 1g of P123 template was added at the same time, placed in a 35°C water bath, and stirred vigorously for 2 hours to obtain a uniform transparent yellowish sol. Then add 0.0041g Pd(NO 3 )·2H 2 O (according to 0.1wt% Pd loading), continue to stir vigorously for 8 hours, transfer it to a constant temperature and humidity drying box with a petri dish, control the temperature at 35°C, and the relative humidity at 40°C, and evaporate the solvent in this environment and induce P123 The self-assembly of the self-assembly, the evaporation induction time lasted for 48 hours to form a gel, and then dried at 100°C for 24 hours, and finally baked at 400°C for 4 hours, with a heating rate of 1°C per minute. Obtain the cerium zirconium palladium solid solution of nanopowder morphology, Figure 1a-f The TEM photos of the catalyst are provided, and the catalysts have formed nanopo...

Embodiment 2

[0036] Preparation condition and preparation procedure are the same as example 1, just Pd(NO 3 )·2H 2 The amount of O added was changed to 0.0081, 0.0203, 0.0406, 0.0813, and 0.2032g, respectively, so that the loading amount of Pd was 0.2wt%, 0.5wt%, 1.0wt%, 2.0wt%, and 5.0wt%.

Embodiment 3

[0038] Observation of prepared catalyst (a) 0.1wt%Pd / Ce by transmission electron microscope (TEM) 0.8 Zr 0.2 o 2 , (b) 0.2wt% Pd / Ce 0.8 Zr 0.2 o 2 , (c) 0.5wt% Pd / Ce 0.8 Zr 0.2 o 2 , (d) 1.0wt% Pd / Ce 0.8 Zr 0.2 o 2 (e) 2.0wt% Pd / Ce 0.8 Zr 0.2 o 2 , (f) 5.0wt% Pd / Ce 0.8 Zr 0.2 o 2 shape. The crystal phase structure of the catalyst was analyzed by X-ray diffraction (XRD), and the crystallite size and unit cell parameters of the catalyst were calculated by Scherrer's formula.

[0039] Figure 1a-f Through the TEM results of the samples, it can be seen that the particle size of the prepared catalyst particles is 5-10nm, the particle size is uniform, and it has a nano-powder shape. There are large gaps between the particles, which can provide a large space for the catalytic reaction. interface.

[0040] Take the half width β of the diffraction peak corresponding to the crystal plane of the sample (111), and use the Scherrer formula: D=0.89λ / (βcosθ) to calculate x...

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Abstract

The invention relates to a preparation method for a cerium-zirconium-palladium nanopowder catalyst. The preparation method comprises the following steps: dissolving a cerium source and a zirconium source in absolute ethanol, and adding P123 template agent to obtain sol; adding palladium nitrate; keeping constant temperature of 35DEG C and constant relative humidity of 40 percent, and performing evaporation induction to form gel; drying at the temperature of 100DEG C; calcining at the temperature of 400DEG C for 4 hours at the temperature rise rate of 1DEG C per minute; and ensuring that the atomic mole ration of cerium to zirconium is 8:2, the palladium loading quantity is 0.1 to 5 weight percent, and a ratio of the cerium source and the zirconium source to the absolute ethanol to the P123 is 10mmol:20ml:1g. The catalyst is suitable for catalytic elimination of CO in flue gas discharged by a catalytic cracking catalyst regeneration device and Co in tail gas of motor vehicles and has the advantages of large specific surface area, uniform distribution of noble metal active ingredients, high catalytic activity and thermal stability, and simple synthesis method; the temperature for complete catalytic conversion of CO can be greatly reduced; the consumption of noble metals is reduced; and the cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to a cerium-zirconium-palladium catalyst with a nano-powder shape and its preparation, and the use of the catalyst system in reducing the complete catalytic oxidation temperature of CO in industrial flue gas and motor vehicle exhaust. Background technique [0002] There is a large amount of CO in the flue gas emitted by industrial production. FCC (Fluid Catalytic Cracking) is one of the main methods for refineries to produce light oil products. During the regeneration process of FCC catalyst, due to the incomplete combustion of coke, the regeneration flue gas contains 6-10v% carbon monoxide (CO), which is one of the main pollution sources of the refinery. At the same time, CO is further burned into CO 2 It can release a lot of heat when it is used, and if it is not fully utilized, it will cause a lot of waste of heat energy. The use of combustion aids can not only reduce the CO content in the flue gas, reduce air pollution, but...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/86B01D53/94B01D53/62
CPCY02A50/20
Inventor 刘坚王斯晗赵震邓旭亮方煜杜龙弟褚洪岭王桂芝段爱军姜桂元邵正宏刘长福周清华何昌洪李玉龙雷忠海王薇
Owner PETROCHINA CO LTD
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