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Cerium oxide modified microwave hydrothermal carbon as well as preparation method and application thereof

A microwave hydrothermal and cerium oxide technology is applied in the preparation/processing of cerium oxide/cerium hydroxide, rare earth metal compounds, and the preparation/purification of carbon, which can solve unstable processing effects, restrict application, investment, and operating costs. High problems, to achieve the effect of low-cost in-situ desulfurization, quality improvement, and corrosion reduction

Active Publication Date: 2021-02-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H available on the market 2 S washing systems, such as iron oxide washing systems, biological trickling filters, etc., are also restricted in H due to high investment and operating costs and unstable treatment effects. 2 Applications in the field of S processing

Method used

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  • Cerium oxide modified microwave hydrothermal carbon as well as preparation method and application thereof
  • Cerium oxide modified microwave hydrothermal carbon as well as preparation method and application thereof
  • Cerium oxide modified microwave hydrothermal carbon as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of cerium oxide modified microwave hydrothermal carbon is prepared according to the following steps: (1) the human feces in the septic tank are naturally air-dried outdoors until the water content is 35%-45%, impurities are removed, freeze-dried, and sieved After 200 mesh sieve, keep away from light for later use.

[0023] (2) Preparation of Ce(NO 3 ) 3 ·6H 2 O solution, and add ammonia to it. Ce(NO 3 ) 3 ·6H 2 The concentration of O is 0.15 mol / L, and the concentration of ammonia water is 7 mol / L.

[0024] (3) Add directing agent SDS to the above solution, directing agent and Ce(NO 3 ) 3 ·6H 2 The molar ratio of O was 2:1, and then added to dry feces, and the mass of cerium oxide was controlled to be 20%, 30% and 40% of the mass of dry human feces, respectively. Microwave heating reaction, the microwave power is 400W, the pressure control is 1.8Mpa, and the heating time is 2h.

[0025] The prepared cerium oxide modified microwave hydro...

Embodiment 2

[0032] The preparation method of cerium oxide modified microwave hydrothermal carbon is prepared according to the following steps: (1) the human feces in the septic tank are naturally air-dried outdoors until the water content is 35%-45%, impurities are removed, freeze-dried, and sieved After 200 mesh sieve, keep away from light for later use.

[0033] (2) Preparation of Ce(NO 3 ) 3 ·6H 2 O solution, and add ammonia to it. Ce(NO 3 ) 3 ·6H 2 The concentration of O is 0.15 mol / L, and the concentration of ammonia water is 7 mol / L.

[0034] (3) Add directing agent SDS to the above solution, directing agent and Ce(NO 3 ) 3 ·The molar ratio of 6H2O is 2:1, then add the dried feces, and respectively control the quality of cerium oxide to be 30% of the dry human feces. Microwave heating reaction, the microwave power is 400W, the pressure is controlled at 1.5Mpa, 1.8Mpa and 2.0Mpa respectively, and the heating time is 2h.

[0035] The prepared ceria-modified microwave hydroth...

Embodiment 3

[0040] The preparation method of cerium oxide modified microwave hydrothermal carbon is prepared according to the following steps: (1) the human feces in the septic tank are naturally air-dried outdoors until the water content is 35%-45%, impurities are removed, freeze-dried, and sieved After 200 mesh sieve, keep away from light for later use.

[0041] (2) Preparation of Ce(NO 3 ) 3 ·6H 2 O solution, and add ammonia to it. Ce(NO 3 ) 3 ·6H 2 The concentration of O is 0.15 mol / L, and the concentration of ammonia water is 7 mol / L.

[0042] (3) Add directing agent SDS to the above solution, directing agent and Ce(NO 3 ) 3 ·6H 2 The molar ratio of O was 2:1, and then added to the dry feces, and the quality of cerium oxide was controlled to be 30% of the dry human feces. Microwave heating reaction, the microwave power is 400W, the pressure control is 1.8Mpa, and the heating time is 2h.

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Abstract

The invention discloses cerium oxide modified microwave hydrothermal carbon as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) naturallyair-drying manure outdoors until the water content is 35%-45%, removing impurities, carrying out freeze-drying, and sieving and storing the material in a dark place for later use; (2) preparing a Ce(NO3)3.6H2O solution, and adding ammonia water into the Ce(NO3)3.6H2O solution; and (3) adding a guiding agent into the solution, then adding dried manure, and carrying out microwave heating reaction to obtain the cerium oxide modified microwave hydrothermal carbon. Based on the idea of treating waste with waste, livestock and poultry manure is used as a raw material to prepare hydrothermal carbon,the hydrothermal carbon is coupled with CeO2 with rich oxygen vacancies and low oxidation-reduction potential between Ce < 3 + > and Ce < 4 + >, manure and rare earth oxide CeO2 with coordination unsaturated property are used as raw materials, and a microwave hydrothermal method is used for preparing a CeO2 / hydrothermal carbon compound additive. Therefore, low-cost in-situ desulfurization in theanaerobic fermentation process is realized, the quality of an anaerobic fermentation product is improved, the corrosion of H2S to facilities and equipment is reduced, and the service life of the equipment is prolonged.

Description

technical field [0001] The invention relates to a cerium oxide modified microwave hydrothermal charcoal and a preparation method and application thereof, belonging to the technical field of biological fermentation. Background technique [0002] Biogas produced by anaerobic digestion consists of 55-70% methane (CH 4 ), carbon dioxide (CO 2 ) (30-45%) and trace amounts of hydrogen sulfide (H 2 S) (0.01-1%) composition. Existing research on anaerobic fermentation mainly focuses on improving CH 4 Yield, while for the by-product H 2 S has less research. H present in biogas 2 S will corrode pipelines and reduce the service life of instruments and equipment. H available on the market 2 S washing systems, such as iron oxide washing systems, biological trickling filters, etc., are also restricted in H due to high investment and operating costs and unstable treatment effects. 2 S processing field applications. Therefore, to study how to reduce the generation of hydrogen sulf...

Claims

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Application Information

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IPC IPC(8): C01F17/235C01F17/10C01B32/05C02F11/04
CPCC01F17/235C01F17/10C01B32/05C02F11/04C01P2002/72C01P2004/03
Inventor 张凯吉芳英
Owner CHONGQING UNIV
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