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Broadband cerium oxycarbonate hydrate microwave absorbent, preparation process and application thereof

A technology of microwave absorber and cerium oxycarbonate, which is applied in the preparation/treatment of rare earth metal compounds, rare earth metal carbonates, etc., can solve the problems of unchangeable equipment parameters, large concentration gradient, and few reports. Novel appearance, simple production equipment and easy operation

Active Publication Date: 2021-06-01
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The morphology of common hydrated cerium oxycarbonate at present is mainly granular, such as Chinese patent document (CN109502627A) discloses a kind of method for preparing particle homogeneous nanometer hydrated cerium oxycarbonate, and can control the hydrated cerium oxycarbonate of other special appearances Preparation methods are rarely reported
At the same time, the current conventional methods for preparing hydrated cerium oxycarbonate mainly include: uniform precipitation method, precipitation-molten salt method, microemulsion method, ion exchange-hydrogen peroxide oxidation method, two-liquid ultrasonic atomization method, combustion method, hydrothermal method, etc. The above methods often have problems such as huge equipment, lengthy process, large concentration gradient, and unchangeable equipment parameters.

Method used

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  • Broadband cerium oxycarbonate hydrate microwave absorbent, preparation process and application thereof
  • Broadband cerium oxycarbonate hydrate microwave absorbent, preparation process and application thereof
  • Broadband cerium oxycarbonate hydrate microwave absorbent, preparation process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A preparation process of a broadband hydrated cerium oxycarbonate microwave absorber, specifically comprising the following steps:

[0054] 0.7816g Ce(NO) 3 ·6H 2 O, 0.2703g of urea was dissolved in 30mL of deionized water, and stirred magnetically at room temperature for 20min to form a colorless solution; then the solution was transferred to a Teflon-lined double-walled microwave digestion tank and placed in a microwave digestion apparatus (WX- 6000, Preekem), microwave radiation at 160°C for 20 minutes, naturally cooled to room temperature, alternately washed with absolute ethanol and deionized water, and dried in an oven at a constant temperature of 40°C to finally obtain the broadband hydrated cerium oxycarbonate microwave absorber.

[0055] The phase and morphology of the obtained product measured under XRD and scanning electron microscope are as follows: Figure 1~2 shown. From the above analysis, it can be seen that the product is a uniform, monodisperse butt...

Embodiment 2

[0057] Compared with the preparation steps disclosed in Example 1, the only difference is that the temperature of microwave radiation is 140° C., and the rest of the preparation steps and process parameters are the same.

[0058] The morphologies of the obtained products measured under the scanning electron microscope are as follows: image 3 shown. The analysis shows that the product is hydrated cerium oxycarbonate mixed in rod shape and butterfly shape. Wherein, the long axis of the butterfly-shaped cerium oxycarbonate hydrate is about 9.79-25.41 μm, the widest part of the short axis is about 4.68-8.16 μm, and the thickness is about 3.76-7.68 μm.

[0059] The heterogeneous material was filled in the paraffin base with 60% mass fraction, and its reflectance was measured as Figure 4 As shown, the effective bandwidth range of reflectivity less than or equal to -10dB is 6.48-9.52GHz, and the maximum reflection loss is -47.35dB.

Embodiment 3

[0061] Compared with the preparation steps disclosed in Example 1, the only difference is that the temperature of microwave radiation is 180° C., and the rest of the preparation steps and process parameters are the same.

[0062] The morphology of the obtained product measured under the scanning electron microscope is as follows: Figure 5 shown. Analysis shows that the product is a uniform, monodisperse multi-level butterfly-shaped hydrated cerium oxycarbonate. Wherein, the butterfly-shaped cerium oxycarbonate hydrate has a long axis of about 11.65-31.66 μm, a short axis of the widest point of about 8.64-11.36 μm, and a thickness of about 4.07-8.46 μm.

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Abstract

The invention discloses a preparation process of a broadband cerium oxycarbonate hydrate microwave absorbent, and belongs to the technical field of microwave absorption. The butterfly-shaped cerium oxycarbonate hydrate is rapidly synthesized by taking cerium nitrate hexahydrate and urea as raw materials and adopting a one-step microwave hydrothermal reaction. The cerium oxycarbonate hydrate microwave absorbent rapidly prepared through a one-step microwave hydrothermal method is novel in morphology and short in reaction time, the morphology and size of the product can be adjusted and controlled by changing the reaction temperature, the ratio of the amount of substance of an alkali source to the amount of substance of a cerium source, time and concentration, and the microwave absorbent has excellent microwave absorption characteristic. The controllable preparation process method disclosed by the invention is simple to operate, short in time and novel and uniform in product morphology, overcomes the characteristics of harsh reaction conditions, complex reaction process, no environmental protection, single reaction product morphology and the like in the previous preparation process, has good industrial application potential, and is expected to be popularized and applied in the market.

Description

technical field [0001] The invention belongs to the technical field of microwave absorption, and relates to a novel high-efficiency broadband microwave absorption material and a preparation process thereof; more specifically, it relates to a simple and controllable process for preparing a broadband cerium oxycarbonate hydrate microwave absorbent. Background technique [0002] In recent years, rare earth materials have played an irreplaceable role in military affairs, chemical industry, glass materials, agriculture and other aspects. Due to the unique 4f electronic structure and lattice oxygen defect characteristics of cerium element, it shows excellent oxygen storage and release capacity and charge exchange capacity. Treatment and other fields are widely used. For example, the Chinese invention patent (CN102344339B) discloses the application of a cerium-based catalyst in methane halooxidation to produce methyl halide; the Chinese invention patent (CN109607591B) discloses a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/247C01F17/10
CPCC01F17/247C01F17/10C01P2004/61C01P2004/30C01P2006/90
Inventor 魏海燕童国秀汪欣欣杨小芬柯丽凤季然刘敏敏吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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