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A technology of ceria and microspheres, applied in the field of nanomaterials, to achieve the effects of easy control, mild reaction conditions, and simple preparation methods
Inactive Publication Date: 2012-11-07
INNER MONGOLIA UNIV OF SCI & TECH
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[0008] This gas-phase diffusion method is used for barium carbonate and calcium carbonate more, but the gas-phase diffusion method is used for the preparation of cerium oxide and has not been reported yet.
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Embodiment 1
[0035] (1) Dissolve industrial cerium carbonate with nitric acid to obtain cerium nitrate, remove impurities and filter to obtain 282.62g / L cerium nitrate mother liquor with high purity.
[0036] Take 42.6ml of cerium nitrate mother liquor in a beaker filled with 457.4ml of water, stir evenly with a glass rod, then vibrate with an ultrasonic wave for 5min; in addition, dissolve 0.5g / L polyelectrolyte PSS in 500ml of water, stir evenly with a glass rod, Also use ultrasonic vibration for 5 minutes; then slowly pour the PSS aqueous solution into the cerium nitrate aqueous solution, adjust the pH to 4, continue stirring until uniform, use ultrasonic vibration for 15 minutes, seal the mouth of the beaker with plastic wrap, and pierce 3 holes on the plastic wrap ,stand-by;
[0037] (2) Take 20.2 g of ground ammonium carbonate, put it into a petri dish, seal it with plastic wrap, and make 3 holes.
[0038] (3) Put the petri dish containing ammonium carbonate in (2) into the bottom o...
Embodiment 2
[0042] (1) Dissolve industrial cerium carbonate with nitric acid to obtain cerium nitrate, remove impurities and filter to obtain 282.62g / L cerium nitrate mother liquor with high purity. Take 9.74ml of cerium nitrate mother liquor in a beaker containing 491.26ml of water, stir evenly with a glass rod, then oscillate with ultrasonic wave for 5min; dissolve 0.5g / L PAH in 500ml of water, stir evenly with a glass rod, Ultrasonic oscillation for 5 minutes; then slowly pour the polyelectrolyte PAH aqueous solution into the cerium nitrate aqueous solution, adjust the pH to 4, continue stirring until uniform, use ultrasonic oscillation for 15 minutes, seal the mouth of the beaker with plastic wrap, and pierce 3 holes on the plastic wrap ,stand-by;
[0043] (2) Take 3.8g of ground ammonium bicarbonate, put it into a petri dish, seal it with plastic wrap, and make 3 holes.
[0044] (3) Put the petri dish containing ammonium bicarbonate in (2) into the bottom of the desiccator, add a pa...
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Abstract
The invention discloses a preparation method of cerium oxide microspheres, which comprises the following steps: preparing spherical cerous carbonate by a vapor phase diffusion process by using polyelectrolyte as a shape control agent; and carrying out high-heat treatment to obtain the CeO2 microspheres with high specific area. The particle size of the CeO2 microspheres is 300-500nm, and the specific area reaches more than 110 m<2>/g after the CeO2 microspheres are roasted at 500 DEG C. The vapor phase diffusion process is utilized for the first time to prepare the cerium oxide microspheres, and the whole reaction process is carried out at room temperature, so that the invention has the advantages of mild reaction conditions and simple preparation method and is easy to control. The polyelectrolyte is used as the shape control agent for the first time to regulate the shape of the cerous carbonate, thereby regulating the shape of the cerium oxide. Cations and anions of the polyelectrolyte in the water solution can regulate the aggregation of ions and control the shape and size of the cerous carbonate, thereby controlling the shape and size of the cerium oxide. The cerium oxide with high specific area has important applications in catalytic materials of automobile exhaust catalytic purification, petroleum cracking, chemical engineering and the like.
Description
[0001] technical field [0002] The invention relates to a method for preparing cerium dioxide microspheres, in particular to a method for preparing powder by using organic matter as a template in a gas phase diffusion device, and belongs to the technical field of nanometer materials. Background technique [0003] Cerium oxide has been widely used in various fields, CeO 2 There are redox ion pairs (Ce 3+ / C 4+ ), thus having unique redox properties, i.e. high ability to store and release oxygen, has been widely used in heterogeneous catalytic reactions, especially with CeO 2 Catalysts as additives or supports have shown good catalytic performance in reactions such as solid oxide fuel cells, automobile exhaust purification, water-gas shift, complete oxidation of methane, formaldehyde, ethanol and CO, and hydrogen production by alcohol reforming. [0004] Generally speaking, CeO with small size and large specific surface area 2 Particles exhibit high catalytic activity and...
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