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Preparation method and application of calcium-based adsorbent

A calcium-based adsorbent, silicon oxynitride technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as reduced adsorption performance, and achieve the effects of easy regeneration, low cost, and extended service life

Active Publication Date: 2016-08-31
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the high-temperature sintering of calcium-based adsorbents in the prior art leading to CO 2 The defect of reduced adsorption performance provides a modified adsorbent with obvious adsorption cycle stability in high temperature environment, which is of great significance for the regeneration of adsorbent and prolonging the service life of adsorbent

Method used

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  • Preparation method and application of calcium-based adsorbent
  • Preparation method and application of calcium-based adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Instead of using silicon oxynitride as a carrier, calcium acetate monohydrate (C 4 h 6 CaO 4 ·H 2 O) Preparation of calcium-based adsorbent for CaO precursor, the operation steps are as follows:

[0024] Dissolve calcium acetate monohydrate in distilled water to make a saturated solution. After stirring continuously for 12 hours in a constant temperature water bath at 80°C, place it in an oven and dry it overnight at 110°C until it becomes a uniform powder, and then place it in a muffle furnace. It can be obtained by calcining at 700°C for 4 hours in an air atmosphere.

[0025] CO 2 Cyclic adsorption stability test: put the prepared adsorbent in a thermogravimetric analyzer, 2 N 2 In the atmosphere, the temperature was raised from room temperature to 750 °C at a rate of 25 °C / min, and the adsorption was carried out at a constant temperature for 10 min (50% CO 2 , and the rest are N 2 ), desorption for 5min (100% N 2 ) cyclically adsorbed CO 2 . Test results s...

Embodiment 2

[0027] Calcium acetate monohydrate (C 4 h 6 CaO 4 ·H 2 O) is the precursor of CaO, with Si 2 N 2 O is a carrier to prepare a loaded calcium-based adsorbent, and the operation steps are as follows:

[0028] (1) Preparation of Si 2 N 2 O carrier: take natural quartz stone powder and activated carbon powder according to SiO 2 : C mass ratio is 1:3 batching, adds the SrO of natural quartz stone powder and active carbon powder total amount 2wt% simultaneously, places in the vacuum tube furnace after mixing, in N 2 1350°C in air for 4 hours, N 2 The flow rate is 1.5L / min, and then placed in a muffle furnace and calcined at 700°C for 6h in an air atmosphere;

[0029] (2) Preparation of calcium-based adsorbent: Dissolve 0.56g of calcium acetate monohydrate in distilled water to make a saturated solution, and take 1g of Si prepared in step (1) 2 N 2 The O carrier was placed in a saturated solution of calcium acetate monohydrate, stirred continuously in a constant temperature...

Embodiment 3

[0032] Calcium acetate monohydrate (C 4 h 6 CaO 4 ·H 2 O) is the precursor of CaO, with Si 2 N 2 O is a carrier to prepare a loaded calcium-based adsorbent, and the operation steps are as follows:

[0033] Get 9.44g calcium acetate monohydrate and be dissolved in distilled water and make saturated solution, get the Si prepared by step (1) in 1g embodiment 2 2 N 2 The O carrier was placed in a saturated solution of calcium acetate monohydrate, stirred continuously in a constant temperature water bath at 100°C for 12 hours, then dried in an oven at 120°C overnight until it became a uniform powder, and then placed in a muffle furnace in air Calcined at 800°C for 6h under the atmosphere to obtain it.

[0034] CO 2 The cycle adsorption stability test method is the same as in Example 1, and the test results: the first adsorption CaO conversion rate is 78.2%, after 25 CO 2 After the adsorption / desorption cycle, the CaO conversion rate was 60.5%, and the CaO conversion rate o...

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Abstract

The invention discloses a preparation method of a calcium-based adsorbent. According to the preparation method, natural quartz stone powder (including a main component SiO2) and active carbon powder are taken as raw materials for preparing silicon oxynitride by adopting a carbon thermal reduction method; and silicon oxynitride is used as an inert supporting material and is treated by a process of immersing, drying and calcining to load CaO so as to prepare the calcium-based adsorbent. By controlling the CaO precursor and calcining conditions, relatively good circulating stability is obtained. The raw material has a wide source, the preparation method is simple and convenient and the operability is strong; and the problem that the adsorption capacity of the high-temperature CO2 calcium-based adsorbent is reduced after a plurality of times of CO2 adsorption / desorption cycles is improved very well.

Description

technical field [0001] The invention relates to a preparation method and application of a calcium-based adsorbent, belonging to CO 2 High temperature adsorption and separation field. Background technique [0002] In recent years, with the development of industry and the continuous expansion of human beings, CO 2 The amount of emissions is increasing day by day, the natural environment is deteriorating, and the greenhouse effect is becoming more and more serious. CO 2 is the chief culprit of the greenhouse effect, CO in the atmosphere 2 Mainly derived from the massive combustion of fossil fuels, capturing and separating CO from industrial waste gas 2 It is of vital significance to solve the problem of greenhouse effect. At present, for CO in high-temperature exhaust gas 2 The adsorption separation mainly focuses on the preparation of high temperature CO 2 Adsorbents mainly include metal oxide adsorbents, lithium-based adsorbents, alkaline liquid adsorbents and calcium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01D53/02
CPCB01D53/02B01J20/0262B01J20/041B01D2253/1124B01D2256/22B01J2220/4806Y02C20/40
Inventor 陕绍云何善传贾庆明蒋丽红王亚明
Owner KUNMING UNIV OF SCI & TECH
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