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Calcium oxide-based high-temperature CO2 adsorbent and its preparation method

A CO2, calcium oxide technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of cumbersome and involved processes, and achieve the effects of improving dispersibility, inhibiting migration, and enhancing effective surface area

Active Publication Date: 2017-11-24
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above methods, the calcium carbonate raw material and the doped raw material are mixed into a slurry, and then spray granulation or other molding methods are used to obtain modified adsorbent particles; the process is cumbersome and involves various solutions. The most important thing is that the adsorbent products obtained by this method are difficult to meet the requirements of the circulating fluidized bed process in terms of strength, wear resistance and particle shape.

Method used

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  • Calcium oxide-based high-temperature CO2 adsorbent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Preparation of impregnation solution Ⅰ: weigh 0.772g of Ce(NO 3 ) 3 ·6H 2 O and 0.388g of La(NO 3 ) 3 ·6H 2 O, dissolved in 6.6ml of deionized water, stirred to dissolve;

[0044] (2) Weigh the γ-Al with high wear resistance that has been screened 2 o 3 Carrier 8.55g, mixed with the above-mentioned impregnating solution I, impregnated with equal volume at 60°C by ultrasonic vibration method, aged for 2 hours, dried at 110°C for 12 hours, and then calcined at 600°C for 4 hours to obtain Ce 2 o 3 / La 2 o 3 Modified γ-Al 2 o 3 carrier;

[0045] (3) Preparation of impregnation solution II: weigh 4.214g of Ca(NO 3 ) 3 4H 2 O, dissolved in 5.4ml of deionized water, stirred to dissolve;

[0046] (4) Ce obtained in step (2) 2 o 3 / La 2 o 3 Modified γ-Al 2 o 3 After the carrier is mixed with the impregnating solution II, it is impregnated in equal volume at 75°C by ultrasonic vibration method, aged for 4 hours, dried at 150°C for 12 hours, and then calc...

Embodiment 2

[0050] (1) Preparation of impregnation solution Ⅰ: weigh 3.031g of Mg(NO 3 ) 3 ·6H 2 O was dissolved in 5.5ml of deionized water and stirred to dissolve;

[0051] (2) Weigh the γ-Al with high wear resistance that has been screened 2 o 3 Carrier 7.5g, mixed with the above-mentioned impregnating solution Ⅰ, impregnated with equal volume at 60°C by ultrasonic vibration method, aged for 2 hours, dried at 110°C for 8 hours, and then calcined at 600°C for 2 hours to obtain MgO modified γ-Al 2 o 3 carrier;

[0052] (3) Preparation of impregnation solution II: Weigh 5.643 calcium acetate, dissolve in 6.8ml deionized water, and stir to dissolve;

[0053] (4) the MgO modified γ-Al obtained in step (2) 2 o 3 After the carrier is mixed with the impregnating solution II, it is impregnated with equal volume at 70°C by ultrasonic vibration method, aged for 4 hours, dried at 110°C for 12 hours, and then calcined at 800°C for 3 hours to obtain a composition of 20% CaO 5 %MgO 75% γ-Al...

Embodiment 3

[0057] (1) Preparation of impregnation solution I: Weigh 2.056g of magnesium gluconate and 0.258g of La(NO 3 ) 3 ·6H 2 O was dissolved in 6.8ml of deionized water and stirred to dissolve;

[0058] (2) Weigh the γ-Al with high wear resistance that has been screened 2 o 3 After mixing 7.7g of the carrier with the above-mentioned impregnating solution I, the ultrasonic vibration method was used to impregnate and age equal volume at 60°C for 4 hours, then dried at 100°C for 10 hours, and then calcined at 800°C for 2 hours to obtain MgO / La 2 o 3 Modified γ-Al 2 o 3 carrier;

[0059] (3) Preparation of impregnation solution II: Weigh 5.643g of calcium acetate [Ca(CH 3 COO) 2 ], dissolved in 6.8ml of deionized water, stirred to dissolve;

[0060] (4) MgO / La obtained in step (2) 2 o 3 Modified γ-Al 2 o 3 After the carrier is mixed with the impregnation solution II, it is impregnated and aged at 60°C for 6 hours by ultrasonic vibration method, dried at 200°C for 10 hours,...

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Abstract

The invention discloses a calcium oxide-based high-temperature CO2 adsorbent and a preparation method thereof. The adsorbent comprises a carrier M and a main active component CaO loaded on the carrier M. The carrier M is further loaded with a structural stabilizing aid A. The general formula of calcium oxide-based high-temperature CO2 adsorbent is <x>CaO.A.<100-x-a>M, wherein x is the mass percentage of CaO; a is the mass percentage of A; x is no less than 5% and no more than 60%; and a is no less than 0.1% and no more than 50%. The calcium oxide-based high-temperature CO2 adsorbent in the invention has high wear resistance, high thermal stability and high activity; the adsorbent loses no more than 20% of CO2 adsorption capacity after 40 adsorption-desorption cycles and has a wear rate is 0.1 to 1 wt% / h; the adsorbent can be prepared by using individual impregnation solutions or a mixed impregnation solution; and the preparation method provided by the invention is simple in process, free of production of waste water, friendly to environment, easy to repeat and especially suitable for large-scale industrial production and application.

Description

technical field [0001] The invention relates to CO in steam reforming hydrogen production technology 2 Adsorbent, specifically a calcium oxide-based high-temperature CO 2 Sorbent and method for its preparation. Background technique [0002] In the case of burning the same weight of coal, gasoline and hydrogen, hydrogen produces the most energy; and the product of hydrogen combustion is water, without ash and waste gas, and will not pollute the environment, while the combustion of coal and oil mainly produces CO 2 , while producing a large amount of SO 2 , can cause pollution such as greenhouse effect and acid rain respectively, therefore, hydrogen is one of the most ideal energy sources in the 21st century. So far, about 48% of the world's hydrogen is produced from steam methane reforming (SMR), which is currently the most mature hydrogen production process. The general chemical reaction formula of steam reforming of methane to produce hydrogen is as follows: [0003] ...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/32B01D53/02
CPCB01D53/02B01D2257/504B01J20/041B01J20/3204Y02C20/40
Inventor 胡燕周云龙李蒙梅慧蒯平宇王大祥
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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