A core-shell sic@c catalyst for microwave-assisted catalytic depolymerization of solid waste and its preparation method

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: 2022-01-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
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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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  • A core-shell sic@c catalyst for microwave-assisted catalytic depolymerization of solid waste and its preparation method

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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 0.01 mol / L surfactant solution, and treat it at an ultrasonic frequency of 30-50 kHz for 20 min 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 and triethanolamine dodecylsulfate.

[0033] (2) Add resorcinol to the suspension in step (1), stir for 30-50 min to dissolve resorcinol completely, then add NaOH solution with a mass fraction of 10% and NaOH solution with a mass fraction of 37% formaldehyde solution, and then reacted with stirring at 25-30 °C for 6-8 h. 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 formaldeh...

Embodiment 1

[0040] Put 1 g of SiC in the reaction vessel, add 8 g of sodium lauryl 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 0.2 g of resorcinol to the suspension, stir for 30 min to completely dissolve the resorcinol, then add 0.2 g of NaOH solution with a mass fraction of 10%, and 0.1 g of a formaldehyde solution with a mass fraction of 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 1 g of the obtained SiC@RF catalyst support precursor, 2 In an atmosphere with a flow rate of 10 mL / min and a water vapor flow rate of 0.01 mL / min, the temperature was raised to 500 °C at a rate of 6 °C / min, and then kept for 6 h to obtain a SiC@C catalyst support. figure 1 Shown is the SEM image of the SiC@C catalyst carrier. It can be ...

Embodiment 2

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

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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 thereof. The core-shell SiC@C catalyst includes a carrier, an active component and a catalytic component. The carrier is SiC@C core-shell composite material, SiC@C core-shell composite material specifically uses resorcinol and formaldehyde to synthesize phenolic resin as a carbon precursor, and coats the surface of SiC to form a carbon layer; the catalytic promoter component is a transition metal The oxide is loaded in the surface pores of the carbon layer; the active component is a noble metal, which is loaded in the surface pores of the carbon layer; and the mass ratio of the carrier, the catalytic promoter component and the active component is 1:(0.005~0.01): (0.01~0.05). The core-shell SiC@C supported catalyst prepared by the invention is used in the microwave-assisted depolymerization process of solid waste, which effectively improves the depolymerization degree and depolymerization efficiency of solid waste, and at the same time improves the orientation of microwave-assisted depolymerization products Regulation has greatly promoted the efficient and high-value utilization of 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 kind of radio-frequency electromagnetic wave with wave-particle duality. The wavelength is between 1 m and 1 mm, and the corresponding frequency ranges from 0.3 GHz to 300 GHz. It is decimeter wave, centimeter wave, A general term for millimeter waves. 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 ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/224B01J35/10B01J37/02B01J37/08B01J37/34B01J32/00
CPCB01J27/224B01J37/346B01J37/343B01J35/1014B01J35/1019B01J37/082B01J37/084B01J37/0201B01J35/0073
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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