Preparation method of sphere-like porous silicon dioxide powder
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A technology of porous silica and spherical shape, applied in the direction of silica, silicon oxide, chemical instruments and methods, etc.
Active Publication Date: 2021-07-30
BEIJING UNIV OF TECH +1
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Embodiment 1
[0026] Accurate 1.78mol H 2 O, 1 mol absolute ethanol, 0.36 mol tetrapropylene hydroxide, 0.002 molnaOH, 43ml silica sol (30%, containing 2.24 mol h 2 O and 0.26mol SiO 2 Stirring, mixed under room temperature conditions, continuous reflow treatment under 80 ° C, and the treatment time is 216 h. The mixture was filtered, and the deionized water was washed 5 times, and 530 ° C in the muffer was 830 ° C for 3 h, and the temperature increase rate was 1 ° C / min, and 1 # sample was obtained.
Embodiment 2
[0028] Accurate 1.67mol H 2 O, 0.93 mol absolute ethanol, 0.33 mol tetraproprioxide, 0.0018 gnOH, 38.5 ml silica sol (30%, containing 2.0 mol h 2 O and 0.23mol Sio 2 Stir, mixed under room temperature, continuous reflow treatment under 80 ° C, and the treatment time was 72 h, and the mixture was transferred to the autoclave and placed at 85 ° C for 72 h. The post mixture was filtered, and the deionized water was washed 5 times, and 550 ° C in the muffle furnace was held for 3 h, and the water temperature rate was 1 ° C / min, and the 2 # sample was obtained after cooling.
Embodiment 3
[0030] Accurate 1.78mol H 2 O, 1 mol absolute ethanol, 0.36 mol tetrapropylene hydroxide, 0.002 molnaOH, 43ml silica sol (30%, containing 2.24 mol h 2 O and 0.26mol SiO 2 Stirring, mixed under room temperature, continuous reflow treatment under 80 ° C, and the treatment time was transferred to the autoclave to the autoclave and placed at 90 ° C for 60 hours. The post mixture was filtered, 550 ° C in the muffle in the muffle was 10 h, and the water temperature rate was 1 ° C / min, and the 3 # sample was obtained after cooling.
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Abstract
The invention discloses a preparation method of sphere-like porous silicon dioxide powder, and belongs to the field of porous materials. The method comprises the following steps: (1) mixing raw materials (the ratio of water to ethanol to a template agent to sodium hydroxide to a silicon source is (14.5-17.4): (3.5-4.2): (1.2-1.5): (0.005-0.012): 1; (2) carrying out aging or reflux treatment for 12-360 hours at the temperature of 75-95 DEG C, crystallizing for 0-360 hours at the temperature of 75-85 DEG C, filtering, and washing with deionized water; and (3) transferring into a muffle furnace for roasting, heating to 400-550 DEG C at a heating rate of 0.1-3 DEG C/min, and preserving heat for 3-6 hours to obtain a target powder material. The preparation method has the characteristics of cheap and easily available raw materials, simple preparation process, no use of a high-temperature and high-pressure device, easy control of preparation conditions, less emission in the preparation process and the like, and the obtained porous adsorption material has better adsorption performance.
Description
Technical field [0001] The present invention relates to a method of preparing a spherical silica powder, which is a technical field of preparation of porous materials. Background technique [0002] The causes of air pollution include nitrogen oxides, volatile organics, etc., which main sources include automotive exhaust, industrial emissions, and the like. For the emission control of gaseous pollutants, it is an important part of the current environmental pollution governance. In order to control, reduce pollutants emissions, realize pollutants such as volatile organics, NO x The goal of the reduction and emissions, proposing higher requirements for the R & D and promotion of prior art. In a variety of governance techniques, the adsorption method is a wide range of applications due to its simple and easy to obtain, the core is the choice of adsorbents. For different pollutants, specific adsorbent selection is the key to the technical governance effect. [0003] Nano silica materi...
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