Modified solid waste red mud catalyst and preparation method and application thereof

A solid waste and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of loose structure, poor apparent performance, uneven particle size distribution, etc., to improve the activity and stability effects

Pending Publication Date: 2020-05-12
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the raw material of red mud contains more active metal elements, it has the disadvantages of

Method used

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  • Modified solid waste red mud catalyst and preparation method and application thereof
  • Modified solid waste red mud catalyst and preparation method and application thereof
  • Modified solid waste red mud catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0033] The preparation method of catalyst of the present invention comprises the steps:

[0034] (1) After drying the sieved red mud raw material, add a certain proportion of deionized water and mix it fully under magnetic stirring; then add a certain concentration of acidic solution to adjust the pH of the mixture; under the condition of heating in a water bath make it fully responsive;

[0035] (2) Naturally cool down to a certain temperature after the reaction is completed; after a period of constant temperature aging, wait for it to drop to room temperature; add alkaline solution to the mixture at room temperature; filter it and wash it with deionized water. Physically compress and dry, and finally grind and sieve the particles;

[0036] (3) Roast the prepared particle samples in the air to obtain the red mud catalyst.

[0037] Step (1) is to grind the red mud raw material, take small particles below 1000 μm and place them in a drying oven at 105 °C for 5 hours to make t...

Embodiment 1

[0049] Weigh 40 g of dried Guangxi red mud raw materials with a particle size of less than 1000 μm, and the moisture content is 5% in terms of mass percentage. Place it in a 500 ml round bottom flask, add 120 g of deionized water to it and stir on a magnetic stirrer at 800 r / min for half an hour. After stirring, add 6 mol / L hydrochloric acid and shake it until the pH is 2, then place the flask in a water bath at 85°C and heat for 2 hours. After the reaction, the mixture was aged in a water bath at 50 °C for 1 h, then naturally cooled to room temperature, and saturated sodium hydroxide solution was added dropwise to the mixture until the pH of the mixture was neutral. The resulting mixture was filtered with suction and washed with deionized water. The product obtained by suction filtration and washing was dried in an oven at 80 °C for 0.5 hours, then placed in a manual physical compressor, compressed into strips, and then dried at 105 °C for 6 hours to completely dehydrate. T...

Embodiment 2

[0051] Weigh 40 g of Inner Mongolia red mud raw material with a particle size of less than 1000 μm after drying, and the moisture content is 5% in terms of mass percentage. Place it in a 500 ml round bottom flask, add 120 g of deionized water to it and stir on a magnetic stirrer at 800 r / min for half an hour. After stirring, add nitric acid solution with a mass fraction of 22% and shake until the pH is 1, then place the flask in a water bath at 85 °C and heat it for 4 hours. After the reaction, the mixture was aged in a water bath at 50 °C for 1 h, then naturally cooled to room temperature, and saturated sodium hydroxide solution was added dropwise to the mixture until the pH of the mixture was neutral. The resulting mixture was filtered with suction and washed with deionized water. The product obtained by suction filtration and washing was dried in an oven at 80 °C for 0.5 hours, then placed in a manual physical compressor, compressed into strips, and then dried at 105 °C fo...

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Abstract

The invention discloses a modified solid waste red mud catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst material preparation. Red mud from Guangxi Pingguo and Inner Mongolia Chifeng is used as a raw material. The preparation method comprises the following steps: screening and drying the red mud, carrying out acid treatment on the red mud byusing hydrochloric acid or nitric acid, performing alkali precipitation by using saturated sodium hydroxide, and finally washing to a neutral level and roasting for different durations under differenttemperature conditions to obtain a catalyst sample for exploring the catalytic effect of the catalyst sample on the tar model compound naphthalene. The obtained catalyst shows a good catalytic activity when catalytically cracking the tar model compound naphthalene, and when deionized water vapor gasified at high temperature is added in the reaction process to catalytically reform naphthalene, thegas production rate and the hydrogen content in the produced gas are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst material preparation, and relates to a preparation method and application of a hazardous solid waste red mud biomass detarring catalyst. Specifically, it is a preparation method and application of a catalyst using low-cost red mud as a raw material. Background technique [0002] There are quite a lot of reports at home and abroad on the use of catalysts to catalytically reform the tar produced in the process of biomass gasification, such as the use of dolomite, olivine, nickel-based catalysts, and biomass charcoal. Although nickel-based catalysts have good catalytic effects, they are prone to reduced activity or even complete inactivation due to carbon deposition and sintering during high-temperature reactions. Similarly, natural catalysts such as dolomite and olivine are often selected as catalysts for cracking tar. Dolomite has high catalytic activity in steam reforming of tar, but its mechani...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J37/03B01J37/08B01J37/10C10G11/04
CPCB01J23/78B01J37/031B01J37/082B01J37/10B01J23/002C10G11/04B01J2523/00
Inventor 陈志伟林若兰林晓薇陆原和怡张劲豪
Owner FUZHOU UNIVERSITY
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