Atmospheric pressure sliding arc discharge plasma reactor for the synthesis of fully crystallized nano-powders
A nano-powder, plasma technology, applied in the field of ions, to achieve the effect of low energy consumption
Inactive Publication Date: 2014-10-15
DALIAN UNIV OF TECH
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Problems solved by technology
At present, in the domestic and foreign literature, there is no research report on the one-step synthesis of nano-powders using sliding arc discharge plasma technology.
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Embodiment 1
[0019] The sliding arc discharge plasma reactor adopts a stainless steel ring with an outer diameter of 14 mm and an inner diameter of 10 mm as the upper electrode 1, and a stainless steel cylinder with an outer diameter of 30 mm, an inner diameter of 13 mm and a length of 20 mm as the lower electrode 2. The distance between the upper and lower electrodes is 14mm. Air with a flow rate of 1.5SLM enters the reactor through the tangential inlet 3 at normal temperature to form a vortex. AC high voltage with a frequency of 4.8kHz is applied to the lower electrode 2 (input power is 70W, 100W and 140W respectively), and sliding arc discharge plasma is generated under atmospheric pressure. N with a flow rate of 100SCCM 2 The gas-carrying atomized tetraisopropyl titanate (TTIP) is introduced from the center of the upper cover 4 of the reactor, flows into the sliding arc discharge area together with the rotating air flow in the insulating cylinder 5, and can be obtained in one step in ...
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The invention discloses an atmospheric sliding arc discharge plasma reactor for synthesizing completely crystallized nano powder, which comprises an upper electrode in an annular structure and a lower electrode in a cylindrical structure, wherein direct current or alternating current high voltage is applied on one electrode; the other electrode is earthed; oxygen-containing gas enters the reactor through a tangential inlet to form vortex; a precursor is introduced along with carrying gas from the center of an upper cover of the reactor, and flows into a sliding arc discharge zone along with the vortex; the sliding arc discharge zone is provided with a powder collection drum for obtaining the completely crystallized nano powder; and the reacted gas is exhausted from a gas outlet. The obtained titanium dioxide nano powder is completely crystallized; main particles are 20-90nm nanospheres, and a crystalline phase composition of the nano powder can be adjusted by input power and gas flow. A method requires no vacuum device or cooling system, and the completely crystallized nano powder is synthesized by one step. The atmospheric sliding arc discharge plasma reactor is simple in technology and low in energy consumption, can run continuously, and is suitable for large-scale industrialization.
Description
technical field [0001] The invention belongs to the technical field of nano material preparation, and relates to an atmospheric pressure sliding arc discharge plasma for synthesizing fully crystallized nano powder. The device does not need a vacuum device and a cooling system, and directly uses air as a discharge gas under atmospheric pressure to synthesize fully crystallized nanopowder in one step. Background technique [0002] Nano-powder materials have specific properties and a wide range of applications. For example, titanium dioxide (TiO 2 ) powder is an ideal semiconductor photocatalytic material due to its advantages of high photocatalytic activity, light corrosion resistance, stable chemical properties, insoluble and non-toxic, and wide application range. It has self-cleaning, eliminating environmental pollutants, antibacterial And deodorization and other functions. TiO 2 The photocatalytic performance mainly depends on factors such as its crystallinity, phase co...
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IPC IPC(8): B01J19/08H05H1/32
Inventor 朱爱民李小松朱晓兵刘景林
Owner DALIAN UNIV OF TECH