CN110142014A - Photothermal Combined Catalytic Degradation Device and Its Application - Google Patents

Abstract

The invention relates to a photothermal combined catalytic degradation device and its application. The photothermal reaction furnace cavity of the device is equipped with a catalytic reactor. In addition, the catalytic reactor is composed of an inner core, an outer cover and a ventilating part. The outer cover and the ventilating part can be Disassemble the connection, the side wall of the ventilation part is provided with an air inlet and an air outlet, the inner core runs through the bottom of the outer cover to the air outlet, one end of the air outlet is connected to a waste gas collection bottle through a pipeline, and one end of the air inlet is connected to a gas generating device through a pipeline. The catalytic reactor with concentric structure is placed in the photothermal reaction furnace, and the full contact between the catalyst and the reaction gas is realized through the gas generating device. The photothermal device is combined with the glass reactor, and light or heat can be used alone, or at the same time. Light and heat have realized the combination of light and heat catalysis, which can better evaluate the catalytic performance of the catalyst.

Description

Photothermal Combined Catalytic Degradation Device and Its Application

technical field

The invention relates to a photothermal combined catalytic degradation device and application thereof, belonging to the field of environmental purification.

Background technique

Energy and the environment are two major themes in today's society. Catalytic technology has important applications in the field of energy and the environment. In a sense, catalysts are the driving force for technological development and productivity improvement. Catalysts often have photothermal synergistic catalysis performance, traditional reactors cannot separate photothermocatalytic properties. The problems existing in the traditional photothermal reaction device mainly include: 1. Insufficient contact between the gaseous substance and the catalyst reduces the actual activity of the catalyst; 2. When the sample is placed vertically, it is easy to fall off and be blown away by the gas; 3. The gas temperature is uneven or low 4. The reactor is linear, with large volume and low thermal efficiency.

Contents of the invention

The technical problem to be solved by the present invention is to provide a photothermal combined catalytic degradation device and its application. The catalytic reactor with concentric structure is placed in the photothermal reaction furnace, and the catalyst and the reaction gas are fully contacted by the gas generating device. The photothermal device is combined with the glass reactor, which can use light or heat alone, or use light and heat at the same time to study the photothermal synergistic catalytic performance of the catalyst.

In order to solve the above problems, the specific technical solution of the present invention is as follows: a photothermal combined catalytic degradation device, comprising a catalytic reactor inside the photothermal reaction furnace cavity, the upper surface of the catalytic reactor is made of transparent material, and the catalytic reactor is composed of Composed of inner core, outer cover and ventilation part, the outer cover and the ventilation part are detachably connected, the inner core and the ventilation part are in one structure, the side wall of the ventilation part is provided with an air inlet and an air outlet, the inner core runs through the bottom of the outer cover to the air outlet, and the air outlet One end is connected to a waste gas collection bottle through a pipeline, and one end of the air inlet is connected to a gas generating device through a pipeline.

The gas generating device is composed of a gas compressor, a gas washing bottle, a gas flow meter I and a gas flow meter II, and the outlet pipe connected to the gas compressor is divided into two paths, one pipeline I is inserted into the gas washing bottle, and the pipeline Gas flowmeter I is connected to I, and another pipeline II is connected to pipeline III, and one end of pipeline III is inserted into the gas washing bottle, and the other end is connected to the air inlet. The setting of gas flow meter II can be used to control the flow of gas, and the setting of gas flow meter I can be used to control the gas concentration.

The upper end surface of the inner core is provided with a support piece with holes. The porous support fixed on the inner core is used to place the catalyst to realize the full contact between the reaction gas and the catalyst, and the catalyst is close to the upper end of the outer cover, which is convenient for light to irradiate the sample.

Resistance wires are distributed on the inner wall of the photothermal reaction furnace, and a light-transmitting plate is built on the upper end surface of the photothermal reaction furnace. The light-transmitting board is used to receive light from the light source, and the light-transmitting board plays the role of heat insulation and light transmission.

The outer cover and the ventilation part are sealed and connected through an O-ring. Among them, the inner core is located inside the outer cover, and the detachable connection method can be easily opened to put in and take out the catalyst sample, and the reaction gas can enter the reactor and fully contact with the catalyst and then flow out from the reactor.

The light-transmitting plate is a glass plate or a quartz plate.

The main sources of light received by the light-transmitting plate and the sample are: ultraviolet lamp, infrared lamp, xenon lamp, high-pressure mercury lamp, iodine-tungsten lamp, led light-emitting diode, laser or monochromatic light obtained by spectroscopic equipment.

The transparent material on the upper surface of the catalytic reactor is a glass plate or a quartz plate.

The beneficial effects brought by the invention are: the light-heat combined catalytic reaction device realizes light, heat and light-heat combined catalysis. The reactor is evenly illuminated and heated in the reactor, which realizes the adjustable light spectrum and catalytic temperature, and the pollutants can fully contact with the catalyst, realizing the degradation of pollutants under the condition of photothermal synergy, so as to study the catalytic performance of materials. The device has the characteristics of high efficiency, convenience, simple structure, sufficient response and the like.

The operator can evaluate the photothermal combined catalytic performance of gaseous substances at the same time. This process can adjust the temperature and change the spectrum of the light source; the device has a simple structure, is easy to operate, and has high reliability. This device can be operated alone, and can also be applied to other The system works together.

Description of drawings

Figure 1 is a schematic diagram of the photothermal combined catalytic degradation device.

Fig. 2 is a schematic diagram of the structure of the catalytic reactor.

Detailed ways

As shown in Figures 1 and 2, a photothermal combined catalytic degradation device includes a catalytic reactor 2 inside the cavity of a photothermal reaction furnace 1, and the catalytic reactor 2 consists of an inner core 2-1, an outer cover 2-2 and The ventilation part 2-3 is composed of the top surface of the catalytic reactor 2 made of transparent material, the outer cover 2-2 is detachably connected with the ventilation part 2-3, the inner core 2-1 and the ventilation part 2-3 are integrally structured, and the ventilation part 2 -3 The side wall is provided with an air inlet 2-3-1 and an air outlet 2-3-2, the inner core 2-1 runs through the bottom of the outer cover 2-2 until the air outlet 2-3-2, and the air outlet 2-3-2 One end is connected to the waste gas collection bottle 3 through the pipeline, and one end of the air inlet 2-3-1 is connected to the gas generating device through the pipeline. The interior of the photothermal reaction furnace can be composed of resistance wires, heating rods, heating sheets, and infrared heating devices to provide heat energy. The heater has a temperature control function and can adjust the temperature. The temperature range of the reactor is from room temperature to 1000 degrees Celsius. A light-transmitting glass plate or quartz plate is placed on the top of the heating furnace for heat insulation and light transmission, and the light can be irradiated into the reactor from the top of the heating furnace.

The gas generating device is composed of a gas compressor 4, a gas washing bottle 5, a gas flow meter I6 and a gas flow meter II14. The gas outlet pipe 9 connected to the gas compressor 4 is divided into two paths, and a pipeline I10 is inserted into the gas washing bottle In 5, a gas flow meter I6 is connected to the pipeline I10, another pipeline II7 is connected to the pipeline III8, one end of the pipeline III8 is inserted into the gas washing bottle 5, and the other end is connected to the air inlet 2-3-1.

The upper end surface of the inner core 2-1 is provided with a perforated support piece 2-1-1.

A resistor 12 is distributed inside the photothermal reaction furnace 1 , and a light-transmitting plate 11 is built on the resistor 12 .

In the present invention, the heat energy is provided by the resistor part, and the temperature can be adjusted at will, and the temperature can be programmed. The concentric structure realizes the full contact between the catalyst and the reaction gas, and the sample will not be blown away by the atmospheric flow reactor, and the catalyst can be fully utilized to obtain the highest apparent catalytic activity. The gas adopts a folded form, and the gas first enters the outer cover, which is beneficial to the heat exchange and temperature rise of the gas, providing the real temperature and uniformity of the reaction gas, and the reactor has a small volume and high thermal efficiency. The reactor is uniformly illuminated and heated in the reaction furnace, which realizes that the pollutants can fully contact with the catalyst, and realizes the degradation of pollutants under the condition of photothermal synergy. The reactor is uniformly illuminated and heated in the reactor, and the light source spectrum can be adjusted. The catalytic temperature can be adjusted, and the pollutants can be fully contacted with the catalyst, realizing the degradation of pollutants under the condition of photothermal synergy. The reactor is placed in the reaction furnace, and the light source is placed on the top of the reaction furnace. The dissociation of the photothermal catalytic performance can be achieved by setting the photothermal conditions separately, and the catalyst activity under different ambient temperatures under simulated sunlight can be realized by setting the photothermal conditions at the same time. It can be seen that the present invention scientifically combines the photothermal combined device and the glass reactor together, utilizes light and heat at the same time, and realizes photothermal combined catalysis to better evaluate the catalytic performance of the catalyst.

The outer cover 2-2 and the ventilation part 2-3 are sealed and connected through an O-ring 13 .

The transparent plate 11 is a glass plate or a quartz plate.

The main sources of light received by the transparent plate 11 are: ultraviolet lamps, infrared lamps, xenon lamps, high-pressure mercury lamps, iodine-tungsten lamps, LED light-emitting diodes, lasers or monochromatic light obtained by spectroscopic equipment.

The transparent material on the upper surface of the catalytic reactor is a glass plate or a quartz plate.

Embodiment one:

(1) This example is a photothermal combined catalytic degradation evaluation device. The catalyst is catalytically degraded in a combined photothermal environment. Before the experiment, 0.1g of the catalyst is put into the top of the glass reactor; connect the instrument and check the air tightness .

(2) After connecting the instrument in step (1), heat the water bath with isopropanol and maintain it at 30°C. Part of the isopropanol liquid can be volatilized into gas. Adjust the gas flow meter, turn on the gas compressor, and use air as the carrier gas It can bring isopropanol gas into the reactor, control the total gas flow rate at 80ml/min, control the concentration of isopropanol to 4300ppm, turn on the resistor and light source at the same time, adjust the temperature, the catalyst can decompose isopropanol into acetone gas.

(3) After step (2), isopropanol and acetone gas flow out from the gas outlet, and 1mL of gas is extracted to detect the content of acetone by gas chromatography, and the catalyst degradation is obtained by comparing the content of isopropanol at the inlet and outlet Rate, degradation rate = acetone concentration ÷ isopropanol concentration × 100%.

The structural diagram of the photothermal combined catalytic degradation evaluation device of this embodiment is shown in Figure 1, including a resistance heater, a photothermal reaction furnace, a catalytic reactor, a gas scrubber, a gas compressor, and a gas chromatograph. The sectional view of the catalytic reactor is shown in Figure 2, which is also divided into internal and external. The detachable glass reactor is composed of an internal glass tube and an external glass cover. The two parts are connected by an O-ring, and the internal and external glass cover and the glass cover can be connected The tube is separated, which is convenient for storing and collecting catalyst samples. After the gas enters the glass cover and is catalyzed, it flows out of the inner glass tube. The catalyst can be placed on the top of the inner glass tube. Place the catalytic reactor in the combined photothermal device in the photothermal reactor, connect the glass reactor to the gas collecting bottle with isopropanol with a connecting pipe, and connect the other end of the gas collecting bottle to the gas compressor. In the middle, a gas flow meter is used to control the flow rate and concentration; isopropanol and the acetone decomposed into it flow out from the gas outlet, and the gas is extracted to detect the acetone content, and the rest is collected with a water tank.

The top of the glass tube inside the catalytic reactor holds the catalyst, the catalyst is mainly gC ₃ N ₄ /MnOx, ZnO, TiO ₂ and so on can also be used.

The present invention can also have other implementation modes, and all technical solutions formed by replacing equivalents with equivalent transformations all fall within the protection scope of the present invention.

Embodiment two:

(1) This example is a photothermal combined catalytic degradation evaluation device. The catalyst is catalytically degraded in a photothermal combined environment. Before the experiment, the catalyst is placed on the top of the glass reactor; the instrument is connected and the air tightness is checked.

(2) After connecting the instrument in step (1), configure the simulated flue gas consisting of NO (4000ppm), NH ₃ (4000ppm), air, and N ₂ (balance gas) in advance, and connect the simulated flue gas to the reaction gas road, the total flow rate is 260ml/min, and the volumetric space velocity is 5100h ^-1 . Turn on the resistor and the light source at the same time, control the temperature in the reaction furnace to 20-260°C while the light is on, keep it at 20°C for 30 minutes, and record when the gas is stable.

(3) After step (2), use a flue gas analyzer to detect and online detect the contents of O ₂ and NO in the simulated flue gas.

The structural diagram of the photothermal combined catalytic degradation evaluation device of this embodiment is shown in Figure 1, the resistance can be heated by a resistance heater, photothermal reaction furnace, catalytic reactor, gas washing bottle, and gas compressor, flue gas analysis instrument. The cross-sectional view of the catalytic reactor is shown in Figure 2, which is also divided into internal and external. The detachable glass reactor is composed of an internal glass tube and an external glass cover. The two parts are connected by bolts, and the internal and external glass cover and the glass tube can be separated. , It is convenient to hold and collect catalyst samples. After the gas enters the glass cover and is catalyzed, it flows out from the inner glass tube. The catalyst can be placed on the top of the inner glass tube. Put the catalytic reactor in the combined photothermal device in the photothermal reaction furnace, connect the glass reactor with the gas collecting bottle with simulated flue gas at one end, and connect the other end of the gas collecting bottle with the gas compressor. Among them, a gas flow meter is used to control the flow rate and concentration; the conversion rate of NO is detected at the gas outlet.

The catalytic reactor is placed vertically inside the photothermal reaction furnace, and the combined photothermal device can be a hollow cuboid or a hollow cylinder. The purpose of both is to use resistance heating to achieve uniform heating; at the same time, the top is directly illuminated by the light source, and the light source and the resistance wire can be separated by a transparent glass plate, which can play the role of heat preservation.

The present invention can also have other implementations, polluting gas can be replaced by SO ₂ , CO, CO ₂ , etc., and any technical solution formed by equivalent replacement with equivalent transformation falls within the protection scope of the present invention.

What has been described above are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the principle of the present invention, which should also be considered as belonging to the protection scope of the present invention.

Claims (8)

1. a kind of photo-thermal combines catalytic degradation device, including photochemical and thermal reaction furnace (1) inside cavity is equipped with catalytic reactor (2), Be characterized in that: catalytic reactor (2) is made of inner core (2-1), outer cover (2-2) and vent portion (2-3), catalytic reactor (2) Upper top surface is transparent material, and outer cover (2-2) is detachably connected with vent portion (2-3), inner core (2-1) and vent portion (2-3) It is structure as a whole, vent portion (2-3) side wall is equipped with air inlet (2-3-1) and gas outlet (2-3-2), and inner core (2-1) is through outer The bottom (2-2) is covered up to gas outlet (2-3-2), gas outlet one end (2-3-2) has gas sampling bottle (3) by piping connection, into There is gas generation apparatus in the one end port (2-3-1) by piping connection.

2. photo-thermal as described in claim 1 combines catalytic degradation device, it is characterised in that: the gas generation apparatus is by gas Gas compressor (4), drexel bottle (5), gas flowmeter I(6) and gas flowmeter II(7) composition, gas compressor (4) connection Escape pipe (9) is divided into two-way, a pipeline I(10) insertion drexel bottle (5) in, pipeline I(10) on be connected with gas flowmeter I (6), another pipeline II(7) connect with pipeline III(8), pipeline III(8) one end incorporation drexel bottle (5) in, the other end connection Air inlet (2-3-1).

3. photo-thermal as described in claim 1 combines catalytic degradation device, it is characterised in that: described upper surface inner core (2-1) It is erected with support chip with holes (2-1-1).

4. photo-thermal as described in claim 1 combines catalytic degradation device, it is characterised in that: in the photochemical and thermal reaction furnace (1) Wall is distributed with resistance wire (12), and light-transmitting plate (11) are erected on photochemical and thermal reaction furnace (12).

5. photo-thermal as described in claim 1 combines catalytic degradation device, it is characterised in that: the outer cover (2-2) and ventilation Partially (2-3) is connected by bolt (13).

6. photo-thermal as claimed in claim 4 combines catalytic degradation device, it is characterised in that: the light-transmitting plate (11) is glass Plate or quartz plate.

7. photo-thermal as claimed in claim 4 combines catalytic degradation device, it is characterised in that: what the light-transmitting plate (11) received The main source of illumination are as follows: ultraviolet lamp, infrared lamp, xenon lamp, high-pressure sodium lamp, iodine-tungsten lamp, led light emitting diode, laser or use Light-dividing device obtains monochromatic light.

8. photo-thermal as described in claim 1 combines catalytic degradation device, it is characterised in that: on the catalytic reactor (2) The transparent material of top surface is glass plate or quartz plate.