CN107096380B - Method and device for treating formaldehyde in air by catalytic oxidation - Google Patents
Method and device for treating formaldehyde in air by catalytic oxidation Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention discloses a catalystA method and a device for treating formaldehyde in air by chemical oxidation. The method uses the integral carbon material as a carrier of the formaldehyde oxidation catalyst, and uses the excellent Joule thermal property, mechanical property and electrothermal conversion efficiency of the catalyst, and uses the catalyst as a pure resistance heating element to directly heat the catalyst in an electrothermal mode, so that unnecessary energy consumption is not caused by using other heating elements in the reactor. The method combines Ag/Co 3 O 4 The catalyst is loaded on an integral porous carbon material, then the integral carbon-based catalyst is placed in a reactor, and both ends of the catalyst are connected with metal electrodes and applied with voltage, so that the temperature of the catalyst is raised to 20-300 ℃; when the air containing 10-500ppm formaldehyde is used in 15000-90000ml h ‑1 g ‑1 The conversion rate of formaldehyde can reach more than 95% when the space velocity of the catalyst flows through the reactor. The method has the advantages of good formaldehyde catalytic oxidation effect, high energy utilization efficiency, small pressure drop of the reactor and simple and convenient operation.
Description
Technical Field
The invention belongs to the field of environmental protection and energy saving, and particularly relates to a method and a device for treating formaldehyde in air by catalytic oxidation.
Background
Indoor harmful volatile organic compounds (Volatile Organic Compounds, VOC) refer to volatile hydrocarbons and derivatives thereof. Formaldehyde is the most representative pollutant in VOCs, and the main sources are various glue substances and various adhesives brought by the chemical industry at present, and the long-term life in the environment containing formaldehyde causes great harm to eyes, cardiovascular and cerebrovascular systems, respiratory systems and nervous systems of people. Formaldehyde has become one of the ubiquitous and serious indoor pollutants in China due to the characteristics of wide sources, large hazard, long duration and the like, and the treatment of formaldehyde is urgent. The formaldehyde treatment methods commonly used at present mainly comprise an adsorption method, a biological method, a catalytic oxidation method, a thermal oxidation method, a plasma method and the like. For VOCs such as formaldehyde that do not need to be recovered, thermal and catalytic oxidation are more thorough treatments. The catalytic oxidation method of formaldehyde is the method with the lowest cost and the easiest realization of wide use, and has better application prospect in the aspect of industrial formaldehyde treatment.
China stipulates the highest allowable concentration of formaldehyde in room airDegree of 0.08mg/m 3 . In order to ensure that the catalyst has high conversion rate in the low-concentration formaldehyde environment, the activity of the catalyst is required to be high. Catalysts for treating formaldehyde can be broadly divided into two categories: one is a noble metal catalyst such as Pt, au, pd, rh and the like; one type is a transition metal oxide, e.g. MnO 2 、CeO 2 、Co 3 O 4 Etc. According to recent reports, catalysts having composite active components, such as noble metal and transition metal oxide combinations, various transition metal complexes, and the like, can improve catalytic activity. The study by Wu Jiang (Environ. Sci. Technology. 2016,50, 5370-5378) et al and the study by Tan Hongyi (Environ. Sci. Technology. 2015,49, 8675-8682) et al confirm this. Patent CN104353465 proposes a Co 3 O 4 /CeO 2 The catalyst with the core-shell structure has good catalytic oxidation activity on formaldehyde at room temperature. Patent CN105013491 reports a NiCo prepared from nickel salt, cobalt salt and surfactant 2 O 4 The nano sheet catalyst has the advantages of high efficiency, low cost and the like. Patent CN104722299 adopts CeO 2 The nano cube is used as a carrier, nano metal Pd particles are loaded as an active component, most or all formaldehyde can be converted into carbon dioxide and water at room temperature, and byproducts such as formic acid, carbon monoxide and the like are avoided.
In practical applications, most gas-solid phase reaction devices require the introduction of a heating element to heat the reaction system to a desired temperature for the reaction. The invention uses electric energy as energy input mode, and utilizes the Joule heating property of integral carbon material to heat the catalyst. In the reaction device system, the integral catalyst loaded with the active components is used as a pure resistance heating element, and the direct-current stabilized power supply can efficiently convert the electric energy input by the direct-current stabilized power supply through two ends into heat energy, so that the integral catalyst can locally reach the temperature required by the reaction. The energy is efficiently utilized, and unnecessary energy consumption caused by introducing an additional heating element into the system is avoided.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a device for treating formaldehyde in air by catalytic oxidation, which can be used for efficiently removing formaldehyde in indoor air or tail gas of a factory with low energy consumption.
The invention adopts the following technical scheme.
A method for treating formaldehyde in air by catalytic oxidation, comprising the following steps:
placing an integral carbon-based catalyst loaded with an active component in a reactor, clamping two ends of the integral carbon-based catalyst by using metal electrodes, connecting the metal electrodes with a positive electrode and a negative electrode of a power supply by using a lead, inputting electric energy into the integral carbon-based catalyst, and enabling the integral carbon-based catalyst to reach a required reaction temperature by utilizing the Joule thermal property of the integral carbon-based catalyst; and then introducing air containing formaldehyde into the reactor, wherein the formaldehyde undergoes catalytic oxidation reaction in the process of passing through the heated integral carbon-based catalyst.
Preferably, the carrier (i.e., monolithic carbon material) of the monolithic carbon-based catalyst is monolithic mesoporous carbon material, monolithic three-dimensional graphene, monolithic carbon-based foam material, or other monolithic carbon material.
Further preferably, the preparation method of the integral mesoporous carbon material comprises the following steps: 3.0g of resorcinol and 1.25g of F127 are mixed, 9ml of water and 11.4ml of absolute ethyl alcohol are added, 0.078g of 1, 6-hexamethylenediamine is added after stirring and dissolution, after stirring is continued for 30min, 4.45g of formaldehyde solution (37%) is added until the solution is milky, the solution is poured into a mould, put into a 90 ℃ oven for curing for 4h, taken out and dried, and the temperature is raised to 800 ℃ at a rate of 5 ℃/min under Ar atmosphere and kept for 2h to prepare the integral mesoporous carbon material.
Further preferably, the preparation method of the integral three-dimensional graphene comprises the following steps: 10mg/ml graphene oxide solution prepared by Hummers method is ultrasonically mixed with 5wt% of polyvinyl alcohol and sucrose to obtain uniform suspension, and then mixed with toluene in a ratio of 1:1 to form stable emulsion. Pouring the emulsion into a mold, freezing at-70deg.C, and lyophilizing, and concentrating under 95% Ar/5%H 2 And (3) maintaining the temperature at 900 ℃ for 2 hours under the atmosphere, and performing thermal reduction to obtain the integral three-dimensional graphene.
Further preferably, the method for preparing the monolithic carbon-based foam material comprises the following steps: and directly carbonizing the melamine foam material cut into a regular shape at 800 ℃ for 2 hours in Ar atmosphere to obtain the integral carbon-based foam material.
Preferably, the active component is one or two of Ag and Co.
Preferably, the preparation of the monolithic carbon-based catalyst comprises the following steps: placing the carrier of the monolithic carbon-based catalyst in a catalyst carrier containing Ag + And Co 2+ Soaking in the soaking solution for 1-20h, taking out, vacuum drying, and maintaining at 300-800 ℃ for 1-8h in inert atmosphere to obtain the monolithic carbon-based catalyst.
Further preferably, the impregnating solution is an aqueous solution of silver salt and cobalt salt, and the cobalt salt is one or more of cobalt nitrate, cobalt chloride and cobalt sulfate; the silver salt is silver nitrate.
Further preferably, ag in the impregnation liquid + The concentration of (C) is 0-10wt%, co 2+ The concentration of (2) is 0-10wt%; the mass ratio of the carrier of the integral carbon-based catalyst to the impregnating solution is 1 (10-200).
Preferably, the metal electrode is a metal sheet electrode such as copper foam, nickel foam, copper sheet and the like.
Preferably, the input voltage is 0-10V when the electric energy is input, and the core temperature of the monolithic carbon-based catalyst is 20-300 ℃.
Preferably, the formaldehyde content in the air is 10-500ppm, and the gas flow rate is 50-300Ncm 3 Per minute, space velocity of 15000-90000ml h -1 g -1 。
The device for realizing the method for treating formaldehyde in the air by catalytic oxidation comprises an integrated carbon-based catalyst, a metal electrode, a reaction tube, a power supply, a temperature display, a thermocouple, a wire, an air inlet tube, an air outlet tube and a sealing sleeve; the integral carbon-based catalyst is arranged in the reaction tube, the metal electrode is clamped at two ends of the integral carbon-based catalyst, and the two ends of the metal electrode are connected with the anode and the cathode of the power supply through wires; the thermocouple measuring end is inserted into the center position of the integral carbon-based catalyst, and the other end of the thermocouple is connected with the temperature display; one end of the reaction tube is connected with the air inlet tube, and the other end is connected with the air outlet tube; the reaction tube, the air inlet tube and the air outlet tube are fixed through the sealing clamping sleeve.
Preferably, the reactor is a cylindrical glass reaction tube.
Compared with the prior art, the invention has the following advantages:
(1) The integral carbon material of the invention is used as a carrier of the catalyst, the size of the integral catalyst can be regulated and controlled by the size of the mould, and the prepared catalyst has good mechanical strength, high specific surface area, good gas permeability and reduced bed lamination, and is beneficial to the loading of active components and the contact between the active components and reactants.
(2) The invention adopts an energy input mode based on the Joule heat property of the integral carbon material, is different from the mode that the traditional fixed bed reactor heats the integral reactor to lead the catalyst to reach the preset reaction temperature, utilizes the Joule heat property of the integral carbon material, and is used as a pure resistance heating element to efficiently convert the input electric energy into heat energy, so that the catalyst is heated to reach the temperature required by the reaction without heating other parts of the reactor which do not participate in the reaction, thereby realizing the efficient utilization of the energy.
Drawings
Fig. 1 is an SEM image of the monolithic mesoporous carbon catalyst in example 12.
Fig. 2 is a TEM image of the monolithic mesoporous carbon catalyst in example 12.
FIG. 3 is an X-ray diffraction pattern of the monolithic mesoporous carbon catalyst of example 12.
FIG. 4a is a graph showing the formaldehyde conversion versus core temperature for monolithic mesoporous carbon catalysts of examples 9-14 with different loadings.
FIG. 4b is a graph showing the relationship between formaldehyde conversion and input power density for monolithic mesoporous carbon catalysts of examples 9-14 with different loadings.
FIG. 5 is a schematic diagram of an apparatus for treating formaldehyde in air by catalytic oxidation according to the present invention.
FIG. 6 is a schematic diagram of the monolithic mesoporous carbon catalyst according to example 12.
Detailed Description
Specific embodiments of the present invention will be further described with reference to the accompanying drawings and examples, but the present invention is not limited to the following examples.
The formaldehyde conversion in the following examples was determined by phenol reagent spectrophotometry (national standard number GB/T18204.2-2014) analysis.
The preparation method of the integral mesoporous carbon material comprises the following steps: 3.0g of resorcinol and 1.25g of F127 (poloxamer) are mixed, 9ml of deionized water and 11.4ml of absolute ethyl alcohol are added, 0.078g of 1, 6-hexamethylenediamine is added after stirring and dissolution, after stirring is continued for 30min, 4.45g of formaldehyde solution (with the concentration of 37 wt%) is added until the solution is milky, the mixture is poured into a mould, placed into a 90 ℃ oven for curing for 4 hours, taken out and dried, and the temperature is raised to 800 ℃ at the speed of 5 ℃/min under Ar atmosphere and kept for 2 hours to prepare the integral mesoporous carbon material.
The preparation method of the integral three-dimensional graphene comprises the following steps: 5ml of graphene oxide solution with the concentration of 10mg/ml prepared by Hummers is ultrasonically mixed with 2.5mg of polyvinyl alcohol and 2.5mg of sucrose to obtain a uniform suspension, and then the uniform suspension is mixed with toluene according to the volume ratio of 1:1 to form a stable emulsion. Pouring the emulsion into a mold, freezing at-70deg.C, and drying with a freeze dryer, and adding 95vol% Ar/5vol% H 2 And (3) maintaining the temperature at 900 ℃ for 2 hours under the atmosphere, and performing thermal reduction to obtain the integral three-dimensional graphene.
The preparation method of the integral carbon-based foam material comprises the following steps: and directly carbonizing the melamine foam material cut into a regular shape at 800 ℃ for 2 hours in Ar atmosphere to obtain the integral carbon-based foam material.
The reaction apparatus in the following examples is a schematic view of an apparatus for treating formaldehyde in air by catalytic oxidation according to the present invention, as shown in FIG. 5. The device comprises an integrated carbon-based catalyst 1, a metal electrode 2, a reaction tube 3, a power supply 4, a temperature display 5, a thermocouple 6, a lead 7, an air inlet pipe 8, an air outlet pipe 9 and a sealing clamping sleeve 10; the integral carbon-based catalyst is arranged in the reaction tube, the metal electrode is clamped at two ends of the integral carbon-based catalyst, and the two ends of the metal electrode are connected with the anode and the cathode of the power supply through wires; the thermocouple measuring end is inserted into the center position of the integral carbon-based catalyst, and the other end of the thermocouple is connected with the temperature display; one end of the reaction tube is connected with the air inlet tube, and the other end is connected with the air outlet tube; the reaction tube, the air inlet tube and the air outlet tube are fixed through the sealing clamping sleeve.
The working process of the device is as follows: placing an integral carbon-based catalyst in a reaction tube, clamping two ends of the integral carbon-based catalyst by using metal electrodes, connecting the two ends of the metal electrodes with the anode and the cathode of a power supply by using a lead, fixing the reaction tube, an air inlet tube and an air outlet tube by using a sealing clamping sleeve, then turning on a power supply, inputting electric energy to the integral carbon-based catalyst, enabling the integral carbon-based catalyst to reach the required reaction temperature by utilizing the Joule heat property of the integral carbon-based catalyst, and enabling the catalytic oxidation reaction to be always carried out at a specific temperature without adjusting the power supply voltage after the device reaches a constant temperature steady state; the temperature of the integral carbon-based catalyst is measured by a thermocouple inserted into the central position of the integral carbon-based catalyst, and is displayed on a temperature display, and the temperature of the carbon-based catalyst can be adjusted by adjusting the voltage of a power supply; and introducing air containing formaldehyde into the air inlet pipe, carrying out catalytic oxidation reaction on the formaldehyde in the process of passing through the heated integral carbon-based catalyst, and discharging the reacted gas through the air outlet pipe.
Examples 1 to 8
Placing a monolithic mesoporous carbon material with the diameter of 15mm and the thickness of 10mm in a container with 30ml of AgNO 3 In a beaker of solution, a vacuum treatment is then carried out to evacuate the gas from the tunnel. The mass ratio of the integral mesoporous carbon material to the impregnating solution is 1:150, the solvent is deionized water, and Ag in the solution + The contents are shown in Table 1, and then the catalyst was immersed in a shaker at 200rpm for 10 hours, dried in vacuo, and then heated to 450℃at a rate of 5℃per minute under Ar atmosphere for 5 hours to prepare an integral mesoporous carbon catalyst. The obtained integral mesoporous carbon catalyst is placed into a cylindrical glass reaction tube with the diameter of 15mm, and two ends of the catalyst are pressed by a foam copper wafer-shaped electrode and are connected with the anode and the cathode of a direct current stabilized power supply. The core position temperature of the integral mesoporous carbon catalyst is 90 ℃, the reaction gas is mixed gas containing 100ppm of formaldehyde in the air, and the gas flow rate is 100Ncm 3 Per minute, space velocity of 30000ml h -1 g -1 The conversion of formaldehyde is shown in Table 1.
TABLE 1
As can be seen from Table 1, the formaldehyde conversion was first dependent on Ag + The ion concentration and Ag loading increase to rise, and the ion concentration and Ag loading tend to be stable without obvious change. When Ag is + The formaldehyde conversion was highest at an ion concentration of 2.5 wt%.
Examples 9 to 16
Placing the integral mesoporous carbon material into a container containing 30ml of AgNO 3 /Co(NO 3 ) 2 In a beaker of the impregnating solution, the solvent is deionized water, and Ag in the solution + And Co 2+ The concentrations of (2) and the conversion of formaldehyde at 90℃of the resulting monolithic mesoporous carbon catalyst are shown in Table 2, and the other conditions are the same as in examples 1 to 8.
TABLE 2
As can be seen from Table 2, co in the impregnating solution 2+ The introduction of the catalyst changes the single Ag active component into Ag/Co 3 O 4 The double-component catalyst greatly improves the catalytic oxidation activity of formaldehyde. Wherein the sample of example 12 exhibited optimal activity, further characterization thereof is shown in figures 1-3. From the SEM image of the monolithic mesoporous carbon catalyst of fig. 1, it is seen that it has a large pore fluffy structure, and from the TEM image of fig. 2, uniform distribution of mesopores and catalyst particles can be observed. The XRD pattern of FIG. 3 further illustrates the active components Ag and Co 3 O 4 Is present. Fig. 6 is a pictorial representation of the monolithic catalyst, which is observed to have a regular macroscopic geometry and a macroscopic cell structure on the surface. The regular macroscopic geometry structure provides better mechanical property, and the hierarchical pore structure composed of macroscopic pore channels, macropores and mesopores provides larger specific surface area (565 m) for the integral catalyst 2 /g), better gas passage and lower bed pressure drop. Examples 9 to 14The corresponding graphs of formaldehyde conversion rate and core temperature and input power density of the monolithic mesoporous carbon catalyst with different loadings are shown in fig. 4a and 4b respectively.
Examples 17 and 18
The three different carbon carriers in Table 3 were placed in a monolithic mesoporous carbon material containing 30ml AgNO 3 /Co(NO 3 ) 2 In a beaker of impregnating solution, the gas in the channels is evacuated by subsequent vacuum treatment. The integrated carbon material is cylindrical, the diameter is 15mm, the thickness is 10mm, the mass ratio of the integrated carbon material to the impregnating solution is 1:150, and the impregnating solution contains Ag + The concentration is 1wt%, co 2+ The concentration is 1wt%, then the mixture is respectively placed in a shaking table to be immersed for 10 hours at a rotating speed of 200rpm, and after being taken out and dried in vacuum, the mixture is heated to 450 ℃ at a speed of 5 ℃/min under Ar atmosphere and is kept for 5 hours to prepare the integral carbon-based catalyst. The obtained 3 kinds of integral carbon-based catalysts are respectively placed into a cylindrical glass reaction tube with the inner diameter of 15mm, and two ends are pressed by a foam copper wafer-shaped electrode and are connected with the positive electrode and the negative electrode of a direct current stabilized power supply. The input electric power is regulated to make the temperature of the integral catalyst core position 90 ℃, the reaction gas is the mixed gas containing 100ppm formaldehyde in the air, the gas flow rate is 100sccm, and the airspeed is 30000ml h -1 g -1 . The overall carbon material and corresponding formaldehyde conversion for the different carbon supports is shown in table 3.
TABLE 3 Table 3
Examples 19 to 28
Placing the integrated mesoporous carbon material in a container containing AgNO 3 /Co(NO 3 ) 2 In a beaker of impregnating solution, the gas in the channels is evacuated by subsequent vacuum treatment. The mass ratio of the integral mesoporous carbon material to the impregnating solution is 1:10-200. Ag in the impregnating solution + The concentration is 1wt%, co 2+ The concentration is 1wt%, then the mixture is placed in a shaking table and is immersed for 1 to 20 hours at a rotating speed of 50 to 300rpm, the carbon material and the impregnating solution have different mass ratios, the immersing time and the rotating speed of the shaking table are corresponding to the formaldehyde conversion of the prepared catalystThe conversion was as shown in Table 4, and the other conditions were the same as in example 1.
TABLE 4 Table 4
Examples 29 to 33
And (3) dipping the integral mesoporous carbon material, taking out, drying in vacuum, heating to 300-800 ℃ at a speed of 5 ℃/min under Ar atmosphere, and keeping for 1-8 hours to obtain the integral mesoporous carbon-based catalyst. The different annealing temperatures and times and corresponding formaldehyde conversions for this catalyst are shown in table 5, with the other conditions being consistent with example 1.
TABLE 5
Examples 34 to 40
The monolithic carbon-based catalyst obtained in example 11 was placed in a cylindrical glass reaction tube having a diameter of 15mm, both ends were pressed by a metal disk electrode and connected to the positive and negative electrodes of a power supply, the input voltage was 0 to 10V, the core temperature of the monolithic catalyst was 20 to 300 ℃, the reaction gas was a mixed gas containing 100ppm of formaldehyde in the air, and the gas flow rate was 100Ncm 3 Per min, airspeed of 30000Ncm 3 h -1 g -1 . The different metal electrodes, input voltages, and catalyst core temperatures and corresponding formaldehyde conversions are shown in table 6.
TABLE 6
Examples 41 to 47
The monolithic carbon-based catalyst obtained in example 12 was placed in a cylindrical glass reaction tube having a diameter of 15mm, both ends were pressed by a copper foam disk electrode and connected to the positive and negative electrodes of a power supply, the input voltage was 2.81V, and the temperature of the monolithic catalyst core position was highThe temperature is 90 ℃, the reaction gas is mixed gas containing 10-500ppm formaldehyde in the air, and the gas flow rate is 50-300Ncm 3 Per minute, airspeed of 15-90L h -1 g -1 . The formaldehyde concentration, gas flow rate and space velocity of the mixed gas are shown in Table 7.
TABLE 7
Example 48
The device for treating formaldehyde in air by catalytic oxidation of the invention is compared with the traditional heating reaction device. Comparative experiment using conventional heating mode was similar to example 12, except that: the energy is not input by a direct current stabilized power supply, but the electric heating belt wound on the outer wall of the reaction tube is used for heating the reaction device, so that the center of the catalyst bed layer reaches 90 ℃. Other conditions were the same as in example 12.
TABLE 8
As can be seen from Table 8, the conversion rate of formaldehyde at the same reaction temperature is slightly higher than that of the conventional heating mode, but the energy consumption of the reaction device is greatly reduced compared with that of the conventional heating reaction device.
The above examples are provided for the purpose of clearly illustrating the invention and are not intended to be a complete limitation on the embodiments. Other variations in form will be apparent to those of ordinary skill in the art in light of the foregoing description, and it is not necessary to present examples of all embodiments herein, but obvious variations are contemplated as falling within the scope of the invention.
Claims (8)
1. A method for treating formaldehyde in air by catalytic oxidation, which is characterized by comprising the following steps:
placing an integral carbon-based catalyst (1) loaded with an active component in a reaction tube (3), clamping two ends of the integral carbon-based catalyst by using metal electrodes (2), connecting the two ends of the integral carbon-based catalyst with the positive electrode and the negative electrode of a power supply (4) by using a lead (7), inputting electric energy into the integral carbon-based catalyst, and enabling the integral carbon-based catalyst to reach a required reaction temperature by utilizing the Joule heat property of the integral carbon-based catalyst; introducing air containing formaldehyde into the reactor, carrying out catalytic oxidation reaction on the formaldehyde in the process of passing through the heated integral carbon-based catalyst, wherein the core temperature of the integral carbon-based catalyst is 90-300 ℃, the carrier of the integral carbon-based catalyst is an integral mesoporous carbon material,
the preparation method of the integral mesoporous carbon material comprises the following steps:
mixing resorcinol, polypropylene glycol and addition polymer of ethylene oxide, adding water and ethanol, stirring for dissolving, adding 1, 6-hexamethylenediamine, continuously stirring, adding formaldehyde solution until the solution is milky white, solidifying, taking out for drying, and heating to obtain the integral mesoporous carbon material.
2. The method for treating formaldehyde in air by catalytic oxidation according to claim 1, wherein the active component is one or both of Ag and Co.
3. The method for catalytic oxidation treatment of formaldehyde in air according to claim 1, characterized in that the preparation of the monolithic carbon-based catalyst comprises the following steps: placing a carrier of an integrated carbon-based catalyst in a catalyst containing Ag + And Co 2+ Soaking in the soaking solution for 1-20h, taking out, vacuum drying, and maintaining at 300-800 ℃ for 1-8h in inert atmosphere to obtain the monolithic carbon-based catalyst.
4. The method for treating formaldehyde in air by catalytic oxidation according to claim 3, wherein the impregnating solution is an aqueous solution of silver salt and cobalt salt, and the cobalt salt is one or more of cobalt nitrate, cobalt chloride and cobalt sulfate; the silver salt is silver nitrate.
5. A method for treating formaldehyde in air by catalytic oxidation according to claim 3, characterized in that Ag in the impregnation liquid + The concentration of (C) is 0-10wt%, co 2+ The concentration of (2) is 0-10wt%; the mass ratio of the carrier of the integral carbon-based catalyst to the impregnating solution is 1 (10-200).
6. The method for treating formaldehyde in air by catalytic oxidation according to claim 1, wherein the metal electrode is copper foam, nickel foam or copper sheet.
7. The method for catalytic oxidation treatment of formaldehyde in air according to claim 1, wherein the input voltage is 0-10V when the electric energy is input.
8. The method for catalytic oxidation treatment of formaldehyde in air according to any one of claims 1 to 7, characterized in that the formaldehyde content in the air is 10 to 500ppm and the gas flow rate is 50 to 300Ncm 3 Per minute, space velocity of 15000-90000ml h -1 g -1 。
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| CN108404949B (en) * | 2018-03-21 | 2021-01-12 | 西安石油大学 | Supported monolithic catalyst for catalytic oxidation of formaldehyde and preparation method thereof |
| CN108483424B (en) * | 2018-04-28 | 2019-11-19 | 厦门福纳新材料科技有限公司 | A kind of fullerene electric heating synthesizer |
| CN108816040B (en) * | 2018-06-29 | 2023-04-21 | 中国科学技术大学 | Device and method for degrading formaldehyde through in-situ Joule thermal catalysis |
| CN109999658A (en) * | 2019-05-08 | 2019-07-12 | 中国科学院宁波材料技术与工程研究所 | Electric drive catalyst reaction device and its application |
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| CN101462056A (en) * | 2009-01-13 | 2009-06-24 | 天津大学 | Method for preparing porous nickel metal integral type catalyst |
| WO2013093520A2 (en) * | 2011-12-22 | 2013-06-27 | Bio Nano Consulting | Heatable carbon nanotube aerogels, xerogels and gels |
| CN103170242A (en) * | 2013-04-08 | 2013-06-26 | 武汉大学 | Organic waste gas purifying method |
| CN103962174A (en) * | 2014-05-20 | 2014-08-06 | 大连理工大学 | AgCo bimetallic catalyst with adsorption-catalysis double functions for use in removal of formaldehyde and preparation method thereof |
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