Pellets of sorbent suitable for carbon dioxide capture
A carbon dioxide and adsorbent technology, applied in the fields of alkali metal oxides/hydroxides, inorganic chemistry, alkali metal compounds, etc., can solve the problems of fluidized bed reactors that are not easy to control and powders that are difficult to handle
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Embodiment 1
[0105] Embodiment 1: the preparation of substrate
[0106] The dolomite mineral (Arctic dolomite) was crushed and sieved to a particle size of less than 105 μm. The powdered dolomite is calcined at a temperature of 800°C to 1000°C for 2 to 12 hours. After calcination, the surface area of the resulting substrate increases in the range of 1m 2 / g to 20m 2 / g, preferably 5m 2 / g to 15m 2 / g.
[0107] As shown in Fig. 2, for the calcinations at 800°C and 850°C, the degree of calcination (reacted CaMg(CO 3 ) 2 g / total CaMg(CO in dolomite 3 ) 2 grams) and the surface area of calcined dolomite as a function of calcination time and temperature. Longer calcination times and lower temperatures provide the best balance of material properties.
Embodiment 2
[0108] Example 2: Preparation of Al-Zr doped adsorbent by wet mixing
[0109] Aluminum nitrate nonahydrate (9.0 g) was added to water (10 mL). The mixture was heated in a warm bath at 40°C to obtain a clear solution. The prepared solution was slowly added to the base dolomite (20 g). ZrN 2 o 7 The solution (35 wt % in 2.4 mL) was added to the mixture and stirred. ZrN 2 o 7 The amount of solution added is the adsorbent product obtained in the form of active CaO / ZrO molar ratio of 42:1, wherein, with ZrO 2 Formation of CaZrO 3 CaO is not counted as active CaO. Added aluminum nitrate solution to active CaO / Al 2 o 3 The adsorbent product is obtained in the form of a molar ratio of 16:1, where, with Al 2 o 3 CaAlO 4 CaO is not counted as active CaO. Therefore, the adsorbent has 1.9 wt% Zr ions and 3 wt% Al ions.
[0110] The mixture was dried at a temperature of 200° C. for 24 hours. The dried mixture is ground to a fine powder, which is then granulated or granulate...
Embodiment 3
[0112] Example 3: One Pot Adsorbent
[0113] The substrate prepared according to Example 1 (20 g) was charged into the granulator and stirred. Aluminum nitrate nonahydrate (9.0 g) was added to water (15 mL) to prepare an aluminum solution. By adding additional water and diluting 2.4 mL of ZrN 2 o 7 solution (35wt%) to prepare 4.0mL of ZrN 2 o 7 solution. The two prepared solutions were energized to form fine droplets, which were slowly added to the substrate of the granulator with stirring.
[0114] Add additional water to wet solids. The amount of additional water varied from 0 to 10 ml to adjust the particle size range of the pellets. Adding more water will increase the overall average size of the pellets, while adding less water results in the formation of pellets of small size. When the addition of water is complete, the wet solids are stirred continuously and the formed mass is broken into small agglomerates by a small chopper or by hand. Agglomerates with partic...
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