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High temperature carbon dioxide adsorbent containing silicon nano calcium oxide, its preparation process and application in hydrogen production process

A technology of carbon dioxide and calcium oxide, applied in chemical instruments and methods, silicon compounds, separation methods, etc., can solve the problems of poor cycle adsorption stability, difficult industrial production, high regeneration temperature, etc., and achieve low processing cost and simple method , the effect of reducing the reaction temperature

Inactive Publication Date: 2006-04-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although CaO-based CO 2 The adsorbent has a larger CO than hydrotalcite-like at high temperature 2 Adsorption capacity, but its regeneration temperature is as high as about 1000°C, and the cycle adsorption stability is still very poor. After about 10 cycles of adsorption, the adsorption rate is lower than 40%, so it is difficult to be used in industrial production

Method used

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  • High temperature carbon dioxide adsorbent containing silicon nano calcium oxide, its preparation process and application in hydrogen production process
  • High temperature carbon dioxide adsorbent containing silicon nano calcium oxide, its preparation process and application in hydrogen production process
  • High temperature carbon dioxide adsorbent containing silicon nano calcium oxide, its preparation process and application in hydrogen production process

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Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Nano CaCO 3 Mix directly with forming agent to form adsorbent

[0022] 75 CaCO 3 , 25 kaolin, of which CaCO 3 It is nano powder with a particle size of 40-50nm, and kaolin is a micron powder with a particle size of 1-3μm. Nano CaCO 3 Mix evenly with kaolin at a ratio of 3:1, add appropriate amount of water, stir to form a paste, extrude, and dry. And calcined at 600-800°C to make ordinary nano-calcium oxide high-temperature carbon dioxide adsorbent.

Embodiment 2

[0023] Embodiment 2: the preparation method 1 of the adsorbent treated by surface silicon coating

[0024] Nano-CaCO 3 The average particle size is 40-50nm, Na 2 SiO 3 .9H 2 O dosage is SiO 2 / CaCO 3 = 4.5%. CaCO 3 It is configured into a 10% suspension, and the dispersant sodium hexametaphosphate is added in an amount of 0.002g / ml. The temperature of the suspension was raised to 60°C, and sodium silicate and 1% dilute sulfuric acid solution were slowly added. Aged at around pH 7. Vacuum filtration and washing until there is no sulfate ion. Dry to constant weight at 75 CaCO 3 , 25 kaolin (particle size 1-3μm) mixed evenly, adding an appropriate amount of water, stirring into a paste, extruding, and drying. And calcined at 600-800°C to make silicon-containing nano-calcium oxide high-temperature carbon dioxide adsorbent.

Embodiment 3

[0025] Embodiment 3: the preparation method 2 of the adsorbent treated with silicon coating on the surface

[0026] Nano-CaCO 3 The average particle size is 70-80nm, Na 2 SiO 3 .9H 2 O dosage is SiO 2 / CaCO 3 = 10.0%. CaCO 3 It is configured into a 10% suspension, and the dispersant sodium hexametaphosphate is added in an amount of 0.002g / ml. The temperature of the suspension was raised to 80°C, and sodium silicate and 4% dilute sulfuric acid solution were slowly added. Aged at pH 8. Vacuum filtration and washing until there is no sulfate ion. Dry to constant weight, according to 85CaCO 3 , 15% of kaolin (particle size 1-3μm) is mixed evenly, adding an appropriate amount of water, stirring into a paste, and extruding. The shaped adsorbent is dried and calcined at 600-800° C. to produce a silicon-containing nano-calcium oxide high-temperature carbon dioxide adsorbent.

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Abstract

The invention discloses a silicon-containing nano calcium oxide as adsorbent to hot carbon dioxide, which is prepared by: coating the nano CaCO3 with 2-10 SiO2 with gel-sol method or mixing directly them to prepare nano CaCO3 powder contained silicon; mixing with plasticizer to shape, and calcining at 600-80Deg. It also discloses the application of this product in methane water vapor reforming and making hydrogen industry. This adsorbent reduces regeneration temperature and energy consumption greatly, and has well thermal stability.

Description

technical field [0001] The invention relates to a high-temperature carbon dioxide adsorption material and a preparation method of the material, in particular to a silicon-containing nano-calcium oxide high-temperature carbon dioxide adsorbent used in a methane steam reforming hydrogen production process and a preparation method of the adsorbent . Background technique [0002] The general chemical reaction formula of Steam Methane Reforming (SMR) is as follows: [0003] <chemistry num="001"> <chem file="200510060911_cml001.xml" / > < / chemistry> [0004] Since steam reforming of methane is a strong endothermic reaction, the reaction temperature needs to be as high as 800°C or higher. According to the chemical reaction formula, for every mol of hydrogen produced, there will be 0.25mol of CO 2 produce. The general technical level of SMR is that under the conditions of water / carbon ratio 2.5, reforming reactor temperature 800°C, wat...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01D53/04B01J20/10C01B3/56
CPCY02C20/40Y02P20/151
Inventor 吴素芳吴嵘
Owner ZHEJIANG UNIV
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