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Core-shell SiC@C catalyst for microwave-assisted catalytic depolymerization of solid waste and preparation method of catalyst

A solid waste and microwave-assisted technology, applied in the field of catalytic conversion of waste resources, can solve the problems that the efficiency of microwave absorption and heat transfer is not as good as that of polar medium materials, and affect the catalytic conversion efficiency of catalysts, etc., and achieve efficient depolymerization of microwave absorption enhanced heat transfer and catalysis , promote high-efficiency and high-value utilization, and improve the effect of targeted regulation

Active Publication Date: 2019-10-25
SHAANXI UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

The microwave absorption and heat transfer efficiency of conventional metal catalysts is far lower than that of polar dielectric materials, and microwave conditions will inhibit the active components of the catalyst and affect the catalytic conversion efficiency of the catalyst. Therefore, it is necessary to prepare catalysts that can adapt to the microwave environment to achieve "wave absorption The Synergy of "Heat" and "Catalytic Conversion"

Method used

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  • Core-shell SiC@C catalyst for microwave-assisted catalytic depolymerization of solid waste and preparation method of catalyst

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preparation example Construction

[0031] A method for preparing a core-shell SiC@C catalyst for microwave-assisted catalytic depolymerization of solid waste proposed by the present invention comprises the following steps:

[0032] (1) Put SiC in a reaction vessel, add 0.01mol / L surfactant solution, and treat it at an ultrasonic frequency of 30-50kHz for 20min to form a suspension. The mass ratio of surfactant solution to SiC is (8-12):1. The surfactant is any one of sodium dodecylsulfate (SDS), sodium cetylsulfonate, sodium dodecylbenzenesulfonate, triethanolamine dodecylsulfate.

[0033] (2) Add resorcinol to the suspension in step (1), stir for 30 to 50 minutes to dissolve the resorcinol completely, then add in turn the NaOH solution with a mass fraction of 10% and the formaldehyde with a mass fraction of 37% solution, and then stirred and reacted at 25~30°C for 6~8h. The mass ratio of resorcinol to SiC is (0.2~3):1, the mass ratio of 10% NaOH solution to resorcinol is (1~3):1, and the mass ratio of formal...

Embodiment 1

[0040] Put 1 g of SiC in a reaction vessel, add 8 g of sodium dodecyl sulfate solution with a concentration of 0.01 mol / L, and treat it at an ultrasonic frequency of 30 kHz for 20 min to form a suspension. Then add 0.2g resorcinol in the suspension, stir for 30min, make the resorcinol dissolve completely, then add the NaOH solution 0.2g that the mass fraction is 10%, and the formaldehyde solution 0.1g that the mass fraction is 37%, then The reaction was stirred at 25 °C for 8 h. The obtained product was washed once with ethanol and once with deionized water, and then vacuum freeze-dried to obtain the SiC@RF catalyst carrier precursor. Take 1g of the obtained SiC@RF catalyst support precursor, 2 In an atmosphere with a flow rate of 10mL / min and a water vapor flow rate of 0.01mL / min, the temperature was raised to 500°C at a rate of 6°C / min, and then kept for 6h to obtain a SiC@C catalyst support. figure 1 Shown is the SEM image of the SiC@C catalyst carrier. It can be seen tha...

Embodiment 2

[0042] Put 1 g of SiC in a reaction vessel, add 10 g of sodium hexadecylsulfonate solution with a concentration of 0.01 mol / L, and treat it at an ultrasonic frequency of 35 kHz for 20 min to form a suspension. Then add 1g resorcinol in the suspension, stir for 35min, make the resorcinol dissolve completely, then add successively the NaOH solution 1.5g that the mass fraction is 10%, the formaldehyde solution 1g that the mass fraction is 37%, then in 28 The reaction was stirred at ℃ for 7.5h. The obtained product was washed once with ethanol and twice with deionized water, and then spray-dried to obtain the SiC@RF catalyst carrier precursor. Take 1g of the obtained SiC@RF catalyst support precursor, 2 In an atmosphere with a flow rate of 40mL / min and a water vapor flow rate of 0.2mL / min, the temperature was raised to 650°C at a rate of 8°C / min and kept for 5.5h to obtain a SiC@C catalyst support. The SiC@C catalyst support was added to a concentration of 1 wt% CoCl 2 solution...

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Abstract

The invention discloses a core-shell SiC@C catalyst for microwave-assisted catalytic depolymerization of solid waste and a preparation method of the catalyst. The core-shell SiC@C catalyst comprises acarrier, an active component and a cocatalyst component, the carrier is a SiC@C core-shell composite material, and the SiC@C core-shell composite material is specifically obtained by using phenolic resin synthesized by resorcinol and formaldehyde as a carbon precursor, coating the surface of SiC by the carbon precursor to form a carbon layer; the cocatalyst component is a transition metal oxide and supported in pores of the surface of the carbon layer; the active component is a noble metal and supported in the pores of the surface of the carbon layer; and a mass ratio of the carrier to the cocatalyst component to the active component is 1:(0.005-0.01):(0.01-0.05). According to the method provided by the invention, the core-shell SiC@C supported catalyst prepared by the method is used in the microwave assisted depolymerization process of the solid waste, effectively improves the depolymerization degree and depolymerization efficiency of the solid waste, improves directional adjustmentand control of a microwave-assisted depolymerization product, and greatly promotes the high-efficiency and high-value utilization of the solid waste.

Description

technical field [0001] The invention belongs to the field of catalytic conversion of waste resources, in particular to a core-shell SiC@C catalyst for microwave-assisted catalytic depolymerization of solid waste and a preparation method thereof. Background technique [0002] Microwave is a radio-frequency electromagnetic wave with wave-particle duality. The wavelength is between 1m and 1mm, and the corresponding frequency ranges from 0.3GHz to 300GHz. It is decimeter wave, centimeter wave, and millimeter wave. Collectively. The properties of microwaves are different from other electromagnetic waves. For example, microwaves are selective in heating, have small thermal inertia and strong penetration, and the characteristics of microwaves have certain similarities with geometric optics and sound waves, that is, they have photolike properties. In addition, microwave also has the characteristics of non-ionization and information. As an efficient and clean new energy source, mic...

Claims

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Application Information

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IPC IPC(8): B01J27/224B01J35/10B01J37/02B01J37/08B01J37/34B01J32/00
CPCB01J27/224B01J37/346B01J37/343B01J37/082B01J37/084B01J37/0201B01J35/396B01J35/613B01J35/615
Inventor 王文亮王敏李新平游翔宇赵兴金
Owner SHAANXI UNIV OF SCI & TECH
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