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Carbonate/silicon oxide compound gel adsorbent and preparation method thereof

A composite gel and carbonate technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., to achieve the effect of simple preparation principle and process, wide range of sources, high specific surface area and pore volume

Inactive Publication Date: 2012-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are already some patents on silica airgel and xerogel in China, but alkaline carbonate is added in the gel stage, which is used as a polycondensation catalyst and as an active component of a chemical adsorbent for adsorption and removal of air. There is no report on the patent of harmful acidic substances

Method used

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  • Carbonate/silicon oxide compound gel adsorbent and preparation method thereof
  • Carbonate/silicon oxide compound gel adsorbent and preparation method thereof
  • Carbonate/silicon oxide compound gel adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 52g of TEOS, 69g of EtOH and 18g of deionized water into a 250mL beaker, stir them with magnetic force at 30°C for 120 min to make them evenly mixed, and quickly drop 0.033mL of hydrochloric acid with a concentration (mass fraction) of 5% into the above beaker and stirred at 20°C for 12 h, then aged for 120 h to obtain SiO 2 Sol; 25 g Na 2 CO 3 Add to a 250 mL volumetric flask, add deionized water to volume, and obtain a Na concentration of 100 g / L 2 CO 3 solution; 3.5 mL of the above 100 g / L Na 2 CO 3 The solution was added to the prepared SiO 2 In the sol, stir until it is completely gelled, add EtOH to soak the gel, make it aged for 108 h, and dry naturally at 80 °C for 4 h to obtain Na 2 CO 3 The mass fraction is 2.3% Na 2 CO 3 / SiO 2 Composite xerogel; the xerogel obtained above was placed in a constant temperature drying oven, and treated at 200°C for 8 h to obtain Na 2 CO 3 The mass fraction is 2.3% Na 2 CO 3 / SiO 2 Composite Gel Chemisorbent. ...

Embodiment 2

[0027] Put 52g TEOS, 11.5 g EtOH and 4.5 g deionized water into a 250mL beaker, stir magnetically at 20°C for 30min to mix evenly, and mix 1.825×10 -3 The hydrochloric acid with a concentration (mass fraction) of 5% was quickly added dropwise to the above beaker and stirred at 20 °C for 12 h, and then aged for 120 h to obtain SiO 2 Sol; 50 g Na 2 CO 3 Add it to a 250 mL volumetric flask, add deionized water to volume, and obtain a Na concentration of 200 g / L 2 CO 3 solution; 3.95 mL of the above 200 g / L Na 2 CO 3 The solution was added to the prepared SiO 2 In the sol, stir until it is completely gelled, add EtOH to soak the gel, make it aged for 72 h, and dry it naturally at 80°C for 6 h to obtain Na 2 CO 3 The mass fraction is 5% Na 2 CO 3 / SiO 2 Composite xerogel; the xerogel obtained above was placed in a constant temperature drying oven, and treated at 200°C for 8 h to obtain Na 2 CO 3 The mass fraction is 5% Na 2 CO 3 / SiO 2 Composite Gel Chemisorbent.

...

Embodiment 3

[0032] Put 52 g TEOS, 69 g EtOH and 18 g deionized water into a 250 mL beaker, stir magnetically at 25 °C for 60 min to mix evenly, add 0.03 mL of 37% hydrochloric acid dropwise to the above beaker and stir at 25 °C 120 min, and aged for 6h, to get SiO 2 Sol; 25 g Na 2 CO 3 Add to a 250 mL volumetric flask, add deionized water to volume, and obtain a Na concentration of 100 g / L 2 CO 3 solution; 35 mL of Na with a concentration of 100 g / L 2 CO 3 The solution was added to the prepared SiO2 In the sol, stir until it is completely gelled, add EtOH to soak the gel, make it aged for 144 h, and dry at 80°C for 5 h to obtain Na 2 CO 3 The mass fraction is 19% Na 2 CO 3 / SiO 2 Composite xerogel; the xerogel obtained above was placed in a constant temperature drying oven, and dried at 120°C for 12 h to obtain Na 2 CO 3 The mass fraction is 19% Na 2 CO 3 / SiO 2 Composite Gel Chemisorbent.

[0033] 0.04 g of the composite gel chemisorbent obtained in this experiment was sub...

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Abstract

The invention discloses a carbonate / silicon oxide compound gel adsorbent and a preparation method thereof, which belong to the technical field of preparation of chemical adsorbents. The method comprises the following steps of: adding carbonate at a condensation polymerization reaction phase according to the process characteristic of a porous adsorbent prepared with a sol-gel method for accelerating a reaction and introducing active ingredients specific to a target pollutant, i.e., SO2; and under the action of an acid catalyst, performing a hydrolysis reaction on a silicon source precursor to generate silicon oxide sol, adding a carbonate solution into the sol, stirring for gelling, aging, and drying under the normal pressure to obtain carbonate / SiO2 compound dry gel which can be taken as a chemical adsorbent for removing harmful gases such as SO2 and H2S. The preparation method has the advantages of wide source, low cost, simple process, easiness for operating, no need of baking at a high temperature and low energy consumption; and the prepared compound gel adsorbent has the advantages of high specific surface area, uniform dispersion of active ingredients and high removing efficiency on harmful gases.

Description

technical field [0001] The invention belongs to the technical field of chemical adsorbent preparation, and in particular relates to a carbonate / silicon oxide composite gel adsorbent and a preparation method thereof. Background technique [0002] Chemical adsorbents can effectively remove harmful gases in the air, and can be widely used as air purification materials in factories and homes. The composition of common chemical adsorbents usually includes two parts: carrier and active agent. The carrier generally uses porous materials with various pore sizes according to different needs. The active agent generally uses chemical substances that are non-toxic and harmless and have certain oxidation and catalytic capabilities. The current chemical adsorbents mainly use activated carbon, activated alumina, silica gel, molecular sieves, porous minerals, etc. as carriers, and the common active substances are MnO 2 , ZnO, V 2 o 5 , CuO, Fe 2 o 3 , KMnO 4 etc., there are few report...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30
Inventor 黄正宏刘国强康飞宇
Owner TSINGHUA UNIV
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