CN112642438A - Catalyst composition, SCR catalyst and preparation method thereof, in-situ regenerated catalyst and preparation method and regeneration method thereof - Google Patents

Catalyst composition, SCR catalyst and preparation method thereof, in-situ regenerated catalyst and preparation method and regeneration method thereof Download PDF

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CN112642438A
CN112642438A CN202011533792.0A CN202011533792A CN112642438A CN 112642438 A CN112642438 A CN 112642438A CN 202011533792 A CN202011533792 A CN 202011533792A CN 112642438 A CN112642438 A CN 112642438A
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catalyst
situ
content
scr catalyst
metal elements
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房晶瑞
刘晶
陈阁
马腾坤
刘姚君
孙勇
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China Building Materials Academy CBMA
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    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
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Abstract

The invention relates to a catalyst composition, an SCR catalyst and a preparation method thereof, an in-situ regenerated catalyst and a preparation method and a regeneration method thereof. The composition comprises 3-20% of a conductive component, 5-30% of an active component, 1-15% of a cocatalyst and 50-90% of a carrier; the resistivity of the catalyst prepared by the composition is 1-50 omega.m; the in-situ regenerated catalyst comprises a catalyst, and conductive adhesive is coated on two ends of the catalyst and assembled into a catalyst module; arranging electrodes on the conductive adhesives at two ends of the catalyst module; the catalyst regeneration method comprises the following steps: and applying voltage to the two electrodes to decompose the ammonium bisulfate covering the catalyst through an electrothermal effect. The technical problem to be solved is how to enable the low-temperature SCR catalyst to be regenerated in situ after being poisoned, the low-temperature SCR catalyst has better low-temperature denitration activity, and the low-temperature denitration activity of the low-temperature SCR catalyst is not attenuated after the low-temperature SCR catalyst is regenerated in situ, so that the low-temperature SCR catalyst is more practical.

Description

Catalyst composition, SCR catalyst and preparation method thereof, in-situ regenerated catalyst and preparation method and regeneration method thereof
Technical Field
The invention relates to the technical field of flue gas denitration catalysts, and particularly relates to a catalyst composition, an SCR catalyst and a preparation method thereof, an in-situ regeneration catalyst and a preparation method and a regeneration method thereof.
Background
The SCR (selective catalytic reduction) technology is a flue gas denitration technology widely applied internationally, and generally uses ammonia as a reducing agent to reduce nitrogen oxides in flue gas into N under the action of a catalyst2And H2O, has the advantages of high denitration rate, no influence on the production process, no ammonia escape and the like, and is widely applied to domestic and foreign coal-fired power plants. With the improvement of environmental requirements, the non-electric power industry is also gradually beginning to apply the SCR technology, such as kilns of cement, glass, coking, metallurgy, and the like. However, the utilization efficiency of the non-electric power industry on the flue gas waste heat is high, so that the temperature of the kiln tail flue gas discharged by the kiln tail flue gas waste heat is low, and a low-temperature SCR technology is required to be adopted.
The low-temperature SCR catalyst generally adopts Mn-based catalyst, high-vanadium catalyst and the like, but the low-temperature SCR catalyst is easy to generate sulfur poisoning of the catalyst in engineering application. The sulfur oxide is one of the main components in the coal-fired flue gas, and can react with reducing agent ammonia at a lower temperature to generate ammonium bisulfate which is deposited on the surface of the catalyst to cause the reduction of the catalytic activity, so the regeneration technology of the low-temperature SCR catalyst is the research direction in the field.
Ammonium bisulfate is easy to decompose at high temperature, and ammonium bisulfate can continue to react with NOx at high temperature, so that a burner heating mode can be adopted in engineering design to regenerate the poisoned low-temperature SCR catalyst in situ, namely: the ammonium bisulfate coated on the surface of the catalyst is decomposed by heating with a burner. However, the burner heating method requires a set of combustion system including burner, natural gas transportation, flow control, etc. to be installed in front of the SCR reactor, which not only increases the investment cost, but also adds a new pollution source, which makes the system operation more complicated.
Disclosure of Invention
The invention mainly aims to provide a catalyst composition, an SCR catalyst and a preparation method thereof, an in-situ regenerated catalyst and a preparation method and a regeneration method thereof, and aims to solve the technical problem of how to enable the low-temperature SCR catalyst to be subjected to in-situ regeneration after being poisoned, and the low-temperature SCR catalyst has better low-temperature denitration activity, so that the low-temperature SCR catalyst is more suitable for practical use.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The catalyst composition provided by the invention comprises a conductive component, an active component, a cocatalyst and a carrier.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the catalyst composition comprises the following components in percentage by mass: 3-20% of a conductive component, 5-30% of an active component, 1-15% of a cocatalyst and 50-90% of a carrier.
Preferably, the catalyst composition of the present invention, wherein the conductive component is at least one selected from the group consisting of graphite, graphene, carbon black and carbon fiber; the catalyst prepared from the catalyst composition has a resistivity of 1 to 50 Ω · m.
Preferably, the catalyst composition of the foregoing, wherein the active component is selected from the group consisting of a combination of at least two of manganese, vanadium, tungsten, molybdenum and iron.
Preferably, in the catalyst composition, the content of the manganese element is 0 to 85% of the total content of the metal elements in terms of mole percentage of the metal elements; the content of the vanadium element accounts for 0-60% of the total content of the metal elements; the content of the tungsten element accounts for 0-45% of the total content of the metal elements; the content of the molybdenum element accounts for 0-40% of the total content of the metal elements; the content of the iron element accounts for 0-50% of the total content of the metal elements; the total amount of the metal elements is 100%.
Preferably, the catalyst composition of the present invention further comprises a promoter selected from at least one of copper, cerium, lanthanum, bismuth, niobium and tantalum.
Preferably, the catalyst composition is one wherein the carrier is at least one selected from the group consisting of titanium dioxide, aluminum trioxide, zirconium dioxide and silicon dioxide.
Preferably, in the catalyst composition, the mass of the titanium dioxide accounts for 60 to 100% of the total mass of the carrier.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. According to the preparation method of the SCR catalyst provided by the invention, the SCR catalyst is obtained by mixing, pugging, ageing, extruding, drying, calcining and cutting the catalyst composition.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. The SCR catalyst provided by the invention is prepared according to the method, and the resistivity of the SCR catalyst is 1-50 omega-m.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. According to the present invention, an in-situ regenerated catalyst is provided, which comprises:
a catalyst which is the aforementioned SCR catalyst;
conductive adhesive coated on both ends of the catalyst; assembling the catalyst coated with the conductive adhesive into a catalyst module;
and the electrodes are arranged on the conductive adhesive at the two ends of the catalyst module.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. The preparation method of the in-situ regenerated catalyst provided by the invention comprises the following steps:
1) coating conductive adhesive at two ends of the SCR catalyst;
2) assembling the SCR catalyst coated with the conductive adhesive into a catalyst module;
3) electrodes are disposed on the conductive gel of the catalyst module.
The object of the present invention and the technical problem to be solved are also achieved by the following technical means. According to the regeneration method of the in-situ regenerated catalyst, the in-situ regenerated catalyst is the SCR catalyst; the in-situ regeneration steps of the SCR catalyst are as follows: and applying voltage to the two electrodes to decompose the ammonium bisulfate covering the catalyst through an electrothermal effect.
By the technical scheme, the catalyst composition, the SCR catalyst and the preparation method thereof, the in-situ regenerated catalyst and the preparation method and the regeneration method thereof provided by the invention at least have the following advantages:
1. according to the technical scheme, a conductive component and a cocatalyst are introduced into a formula of the SCR catalyst, conductive adhesive is coated on two ends of the catalyst, and electrodes are arranged on the conductive adhesive after the catalyst coated with the conductive adhesive is assembled. The conductive component, such as carbon-based material, can make the catalyst have conductivity, i.e. electrothermal function. When the catalyst is covered by ammonium bisulfate in the using process, the catalyst can generate an electrothermal effect by applying voltage on the electrodes at the two ends; furthermore, a cocatalyst such as copper oxide is added into the catalyst, so that the decomposition temperature of ammonium bisulfate is effectively reduced, and therefore, under the electric heating effect generated by the conductive component and the electrode, the ammonium bisulfate coated on the surface of the catalyst is decomposed, so that the catalyst provided by the invention can be regenerated in situ; meanwhile, the addition of the cocatalyst reduces the decomposition temperature for decomposing the ammonium bisulfate, namely the catalyst is easier to decompose the ammonium bisulfate after voltage is applied, so that the in-situ regeneration efficiency is improved, and the cost is economic;
2. according to the SCR catalyst regenerated in situ and the preparation method thereof, the cocatalyst can reduce the decomposition temperature of ammonium bisulfate, and can slow down the deposition of ammonium bisulfate on the surface of the catalyst, so that the service time of the catalyst in a regeneration period is prolonged; in another aspect.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a single honeycomb catalyst coated with a conductive adhesive according to the present invention;
FIG. 2 is a schematic diagram of the structure of an in situ regenerated SCR catalyst of the present invention;
FIG. 3 is a denitration curve of a fresh catalyst and a denitration curve after in-situ regeneration in example 1 of the present invention;
FIG. 4 is a denitration curve of a fresh catalyst and a denitration curve after in-situ regeneration in example 2 of the present invention;
FIG. 5 shows the denitration curves of the fresh catalyst and the denitration curves after in-situ regeneration in example 3 of the present invention
FIG. 6 is a denitration curve of a fresh catalyst and a denitration curve after in-situ regeneration in example 4 of the present invention;
FIG. 7 is a denitration curve for a fresh catalyst and a denitration curve after in-situ regeneration in example 5 of the present invention;
FIG. 8 is a denitration curve for a fresh catalyst and a denitration curve after in-situ regeneration in example 6 of the present invention;
FIG. 9 is a plot of the denitration of the fresh catalyst and the denitration after in-situ regeneration in example 7 of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of a catalyst composition, an SCR catalyst and a preparation method thereof, an in-situ regenerated catalyst and a preparation method thereof and a regeneration method thereof according to the present invention with reference to the accompanying drawings and preferred embodiments will be given below.
The invention provides a catalyst composition which comprises a conductive component, an active component, a cocatalyst and a carrier. And mixing the catalyst composition, pugging, ageing, extruding, drying, calcining and cutting to obtain the SCR catalyst. The SCR catalyst has a resistivity of 1-50 omega-m.
The invention also provides an in-situ regeneration catalyst, as shown in the attached figures 1 and 2, which comprises the following components:
a catalyst 1 comprising a conductive component, an active component, a co-catalyst, and a support;
the conductive adhesive 2 is coated at two ends of the catalyst 1; assembling the catalyst coated with the conductive adhesive into a catalyst module;
and the electrodes 3 are arranged on the conductive adhesive at the two ends of the catalyst module.
The catalyst is a monolith catalyst, and a honeycomb catalyst is more preferable.
The conductive component can make the catalyst conductive, and endows the catalyst with conductivity, namely the catalyst has an electric heating function. When the activity of the catalyst is found to be reduced and the denitration efficiency is reduced in the using process of the catalyst, the phenomenon that the catalyst is covered by ammonium bisulfate may occur, and at the moment, the voltage is applied to electrodes at two ends of the catalyst module, so that the catalyst generates an electrothermal effect to decompose the ammonium bisulfate covered on the surface of the catalyst, and the catalyst provided by the invention can be regenerated in situ.
The cocatalyst can slow down the deposition of ammonium bisulfate on the surface of the catalyst and can reduce the decomposition temperature of ammonium bisulfate, and on one hand, the cocatalyst can resist the catalyst from being covered by the ammonium bisulfate so as to prolong the service time of the catalyst in a regeneration period; on the other hand, the decomposition temperature of the ammonium bisulfate is reduced, namely the ammonium bisulfate is more easily decomposed after the catalyst is applied with voltage, so that the in-situ regeneration efficiency is improved, and the cost is economic.
The formula of the SCR catalyst regenerated in situ and the design of the physical structure of the SCR catalyst can enable various catalysts to have an electrothermal effect and heat the catalysts.
Because the problem that the catalyst is subjected to sulfur poisoning and the surface of the catalyst is covered by ammonium bisulfate only exists when the SCR catalyst is subjected to low-temperature denitration, and because the ammonium bisulfate has the characteristic of being decomposed at high temperature, the catalyst disclosed by the invention can exert greater value when being preferably used in the working condition of flue gas denitration at low working temperature
Preferably, the SCR catalyst is a low-temperature denitration catalyst.
Preferably, the honeycomb catalyst comprises the following components in percentage by mass: 3-20% of a conductive component, 5-30% of an active component, 1-15% of a cocatalyst and 50-90% of a carrier.
Preferably, the honeycomb catalyst comprises the following components in percentage by mass: 5-20% of a conductive component, 10-30% of an active component, 2-15% of a cocatalyst and 55-82% of a carrier.
Preferably, the conductive component is selected from at least one of graphite, graphene, carbon black and carbon fiber.
The conductive component is preferably a carbon-based material, and can be a single material of graphite, graphene, carbon black and carbon fiber, or a combination of any two materials, or a combination of any three materials, or a combination of four materials.
Preferably, the active component is selected from the group consisting of a combination of at least two of manganese, vanadium, tungsten, molybdenum and iron.
The chemical symbol Mn of the element manganese, the chemical symbol V of the element vanadium, the chemical symbol W of the element tungsten, the chemical symbol Mo of the element molybdenum and the chemical symbol Fe of the element iron are shown in the specification. The active component is the metal element itself which plays a catalytic role, and is measured by the weight of the oxide of the metal element when the catalyst is prepared. Manganese source oneManganese nitrate (50% solution, molecular weight 178.95), manganese oxalate (MnC) are typically used2O4·2H2O, molecular weight 178.95) and manganese acetate (also known as manganese acetate, (CH)3COO)2Mn·4H2O, molecular weight 245.09) when dosed, it is converted to manganese dioxide. The vanadium source is generally ammonium metavanadate (NH)4VO3Molecular weight 116.98), which is converted to vanadium pentoxide when dosed. The tungsten source is generally ammonium tungstate ((NH)4)10W12O41-xH 2O, molecular weight 3042.58), and the tungsten trioxide is converted into tungsten trioxide during batching. The molybdenum source is commonly ammonium heptamolybdate (also called ammonium paramolybdate, (NH)4)6Mo7O24Molecular weight 1235.87), which is converted into molybdenum trioxide when dosing. The iron source is ferrous acetate (also called ferrous acetate, C)4H6FeO4Molecular weight 173.93), which is converted to ferric oxide when dosed. The above-mentioned reduced calculation is based on the principle that the amount of substance of the active ingredient is constant.
Preferably, the content of manganese element accounts for 0-85% of the total content of metal element in terms of mole percentage of the metal element; the content of the vanadium element accounts for 0-60% of the total content of the metal elements; the content of the tungsten element accounts for 0-45% of the total content of the metal elements; the content of the molybdenum element accounts for 0-40% of the total content of the metal elements; the content of the iron element accounts for 0-50% of the total content of the metal elements; the total amount of the metal elements is 100%.
Preferably, the content of manganese element accounts for 0.01-85% of the total content of the metal elements in terms of mole percentage of the metal elements; the content of the vanadium element accounts for 0-50% of the total content of the metal elements; the content of the tungsten element accounts for 0.2-45% of the total content of the metal elements; the content of the molybdenum element accounts for 0.2-40% of the total content of the metal elements; the content of the iron element accounts for 0.1-50% of the total content of the metal elements.
Preferably, the content of manganese element accounts for 0.2-80.1% of the total content of the metal elements in terms of mole percentage of the metal elements; the content of the vanadium element accounts for 0-45.2% of the total content of the metal elements; the content of the tungsten element accounts for 5-44.1% of the total content of the metal elements; the content of the molybdenum element accounts for 5-14.9% of the total content of the metal elements; the content of the iron element accounts for 0.6-49.8% of the total content of the metal elements.
Preferably, the content of manganese element accounts for 0-0.01%, 0.01-0.2%, 0.2-30.2%, 30.2-50.4%, 50.4-60.2%, 60.2-78.6%, 78.6-80.1% and 80.1-85% of the total content of metal element in terms of mole percentage of the metal element; the content of vanadium element accounts for 0-5%, 5-19.7%, 19.7-45.2%, 45.2-59.1% and 59.1-60% of the total content of metal element; the content of the tungsten element accounts for 5-9.9%, 9.9-44.1% and 44.1-45% of the total content of the metal elements; the content of the molybdenum element accounts for 0-0.2%, 0.2-5%, 5-9.9%, 9.9-14.9%, 14.9-22.4% and 22.4-40% of the total content of the metal elements; the content of the iron element accounts for 0.1-0.6%, 0.6-9.9%, 9.9-10.1%, 10.1-14.9%, 14.9-21.4%, 21.4-49.8% and 49.8-50% of the total content of the metal elements.
Preferably, the promoter is selected from at least one of copper, cerium, lanthanum, bismuth, niobium and tantalum.
The chemical symbol Cu of the element copper, the chemical symbol Ce of the element cerium, the chemical symbol La of the element lanthanum, the chemical symbol Bi of the element bismuth, the chemical symbol Nb of the element niobium and the chemical symbol Ta of the element tantalum are used. The cocatalyst may be used singly, or in combination of any two or more thereof. The promoter is a metal element per se, and is measured by the weight of the oxide when the catalyst is prepared. Cerium source is generally cerium nitrate (Ce (NO)3)3·6H2O, molecular weight 434.22), which is converted to cerium oxide when dosed. Niobium source adopts niobium (C) oxalate10H5NbO20Molecular weight 538.04) or Nb2O5The oxides of copper, lanthanum, bismuth and tantalum are directly added, and are respectively copper oxide, lanthanum oxide, bismuth oxide and tantalum oxide.
Preferably, the carrier is at least one selected from the group consisting of titanium dioxide, aluminum trioxide, zirconium dioxide and silicon dioxide.
The carrier may be used singly, or in combination of any two or more thereof.
Preferably, titanium dioxide is preferably added into the carrier.
Preferably, the mass of the titanium dioxide accounts for more than or equal to 60 percent, more than or equal to 70 percent, more than or equal to 80 percent and more than or equal to 90 percent of the total mass of the carrier.
The invention also provides a preparation method of the in-situ regenerated SCR catalyst, which comprises the following steps: 1) mixing a conductive component, an active component, a cocatalyst and a carrier, pugging, ageing, extruding, drying, calcining and cutting to obtain a honeycomb catalyst; 2) coating conductive adhesive at two ends of the honeycomb catalyst; 3) assembling the honeycomb catalyst coated with the conductive adhesive into a catalyst module; 4) electrodes are disposed on the conductive gel of the catalyst module.
In the preparation process of the honeycomb catalyst, only the material selection and the component proportion of the conductive component, the active component, the cocatalyst and the carrier are specially designed for realizing the effect of in-situ regeneration, and the rest steps such as mixing, pugging, ageing, extruding, drying, calcining and cutting can adopt the conventional method in the field, and are not particularly limited in the technical scheme of the invention.
The conductive adhesive and the electrode can be products with any specifications on the market, and the conductive adhesive and the electrode are required to be capable of resisting the working temperature of the catalyst.
The catalyst of the invention is a low-temperature SCR catalyst, and the working temperature of the catalyst is generally less than 350 ℃.
The invention also provides an in-situ regeneration method of the in-situ regenerated SCR catalyst, wherein the SCR catalyst is the SCR catalyst; the in-situ regeneration steps of the SCR catalyst are as follows: and applying voltage to the two electrodes to decompose the ammonium bisulfate covering the catalyst through an electrothermal effect.
According to the catalyst provided by the technical scheme of the invention, the conductive component and the cocatalyst component are introduced into the honeycomb catalyst and are designed into a structure containing the conductive adhesive and the electrode, so that the catalyst can be electrically heated by applying voltage when the activity of the catalyst is reduced, and the in-situ regeneration of the denitration activity can be realized.
The following is a detailed description of the embodiments.
The embodiments are provided in order to provide detailed embodiments and specific procedures, which will help understanding of the present invention, but the scope of the present invention is not limited to the following embodiments.
Example 1
(1) Preparing materials: total catalyst mass 600kg
Active components: 169kg and 192kg, respectively, in terms of MnO, were weighed using a mixture of manganese oxalate and manganese nitrate (50% solution) as the manganese source2A mass of about 130 kg; weighing 16.38kg of ammonium heptamolybdate in terms of MoO3A mass of about 13.32 kg; weighing 23.41 parts of ammonium tungstate, and converting into WO3A mass of about 21.48 kg; weighing 32.16kg of ferrous acetate, which is converted into Fe2O3A mass of about 14.82 kg;
conductive component (c): 48kg of carbon fibers as a conductive component;
and (3) a cocatalyst: respectively weighing 12kg of La2O3And 18kgBi2O3；
Carrier: 342kg of titanium dioxide powder is weighed.
(2) Adding the components into a mixing mill step by step according to the sequence of a carrier, an active component, a cocatalyst and a conductive component, adding water and a forming aid for mixing, wherein the forming aid comprises 3-5 per mill stearic acid, 9-1.1% lactic acid (with the mass solid content of 80%), 8-1% CMC and 1.5-1.7% PEO by mass, and the content of the forming aid is the percentage of the mass of the aid in the mass of the carrier; the honeycomb catalyst with the size of 150mm multiplied by (800-1300) mm is prepared by the procedures of ageing, extruding, drying, calcining, cutting and the like. Coating conductive adhesive on two ends of a honeycomb catalyst, assembling into a module, and installing electrodes on two ends of the catalyst module; wherein the ageing is to put the mixed pug into a relatively closed container for ageing for 6-48 h; the extrusion is to filter the aged mud in a filter to remove coarse particles in the mud, then put the mud into an extruder, select a die with a certain number of holes and extrude the mud into a honeycomb catalyst green body; the drying is to dry the honeycomb blank body for 5-20 days at room temperature and then dry the honeycomb blank body for 12-48 hours at the temperature of 60-70 ℃; in the calcination step, the dried honeycomb catalyst blank is placed in a mesh belt kiln and calcined in a reducing atmosphere (for preventing the conductive component from being oxidized), so that salt substances in the denitration material blank are fully decomposed into metal oxides required for denitration.
The resistivity of the in-situ regenerated SCR catalyst prepared in the embodiment is 6.2 omega · m, the denitration efficiency can reach 70% at the working temperature of 100 ℃, then the denitration efficiency reaches the highest at 200 ℃ along with the increase of the working temperature, the denitration efficiency can reach 95%, and then the denitration efficiency gradually decreases along with the increase of the working temperature; the catalyst of the embodiment preferably has the working temperature of 100-280 ℃.
When the denitration activity of the catalyst of the embodiment is reduced to 60% of the initial activity, a voltage of 220V or 380V is applied for 10-30 minutes to carry out in-situ regeneration.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 1 and the attached drawing 3 in detail, wherein the ordinate of the attached drawing 3 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 1
Figure BDA0002849461360000091
Example 2
(1) Preparing materials: total catalyst mass 600kg
Active components: weighing 20kg of ammonium metavanadate in terms of V2O5A mass of about 15.6 kg; weighing 0.25kg of manganese nitrate solution, which is converted into MnO2A mass of about 0.06 kg; 42.25kg of ammonium tungstate is weighed and converted into WO3A mass of about 38.76 kg; 6.6kg of ammonium heptamolybdate is weighed and converted into MoO3A mass of about 5.4 kg; weighing ferrous acetate 0.39kg, converted into Fe2O3A mass of about 0.18 kg;
conductive component (c): weighing 18kg of graphene and carbon fiber respectively;
and (3) a cocatalyst: weighing 30.24kg of cerium nitrate in terms of CeO2A mass of about 12 kg;
carrier: 432kg of titanium dioxide, 36kg of silicon dioxide and 24kg of aluminum oxide are weighed.
(2) Same as example 1
The resistivity of the in-situ regenerated SCR catalyst prepared by the embodiment is 15 omega · m, the denitration efficiency can reach 70% at the working temperature of 160 ℃, then the denitration efficiency reaches the highest at 225-250 ℃ along with the improvement of the working temperature, the denitration efficiency can reach 97%, and then the denitration efficiency is basically stable along with the increase of the working temperature; the working temperature of the catalyst of the embodiment is preferably 160-350 ℃.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 2 and the attached drawing 4 in detail, wherein the ordinate of the attached drawing 4 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 2
Figure BDA0002849461360000101
Example 3
(1) Preparing materials: total catalyst mass 600kg
Active components: using the mixture of manganese nitrate solution and manganese acetate as manganese source, respectively weighing 122kg and 88.5kg, which is equivalent to MnO2A mass of about 61.8 kg; weighing 6.9kg of ammonium metavanadate and converting into V2O5A mass of about 5.34 kg; weighing 31kg of ammonium heptamolybdate in terms of MoO3A mass of about 25.2 kg; weighing 14.8kg of ammonium tungstate, which is converted into WO3A mass of about 13.56 kg; weighing 30.5kg of ferrous acetate, which is converted into Fe2O3A mass of about 14.06 kg;
conductive component (c): 60kg of carbon black; 60kg of graphite;
and (3) a cocatalyst: weighing 18kg of niobium pentoxide;
carrier: weighing 360kg of titanium dioxide, 30kg of zirconia and 12kg of silicon dioxide.
(2) Same as example 1
The resistivity of the in-situ regenerated SCR catalyst prepared by the embodiment is 1.2 omega.m, the denitration efficiency can reach 70% at the working temperature of 120 ℃, then the denitration efficiency can reach more than 90% at 150 ℃ along with the improvement of the working temperature, and then the denitration efficiency is basically stabilized at more than 95% along with the increase of the working temperature; the catalyst of the embodiment preferably has the working temperature of 120-350 ℃.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 3 and the attached drawing 5 in detail, wherein the ordinate of the attached drawing 5 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 3
Figure BDA0002849461360000111
Example 4
(1) Preparing materials: total catalyst mass 600kg
Active components: 59.68kg of manganese nitrate solution is weighed, and the equivalent is MnO2A mass of about 14.7 kg; weighing 7.8kg of ammonium metavanadate and converting into V2O5A mass of about 6.1 kg; weighing 5.9kg of ammonium heptamolybdate in terms of MoO3A mass of about 4.8 kg; weighing 8.44kg of ammonium tungstate, which is converted into WO3A mass of about 7.74 kg; weighing 5.9kg of ferrous acetate, which is converted into Fe2O3A mass of about 2.7 kg;
conductive component (c): 42kg of carbon fibers;
and (3) a cocatalyst: weighing 30.24kg of cerium nitrate in terms of CeO2A mass of about 12 kg; 36kg of lanthanum oxide and 170kg of niobium oxalate, which is equivalent to 42kg of niobium pentoxide;
carrier: 420kg of titanium dioxide and 12kg of silicon dioxide are weighed.
(2) Same as example 1
The resistivity of the in-situ regenerated SCR catalyst prepared by the embodiment is 10 omega · m, the denitration efficiency can reach 70% at the working temperature of 130 ℃, then the denitration efficiency can reach more than 85% at 150 ℃ along with the increase of the working temperature, and then the denitration efficiency is basically stabilized at 98% along with the increase of the working temperature; the catalyst of the embodiment preferably has the working temperature of 130-350 ℃.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 4 and the attached drawing 6 in detail, wherein the ordinate of the attached drawing 6 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 4
Figure BDA0002849461360000121
Example 5
(1) Preparing materials: total catalyst mass 600kg
Active components: weighing 65.22kg of manganese acetate, which is converted into MnO2A mass of about 23.46 kg; weighing 5.2kg of ammonium metavanadate and converting into V2O5A mass of about 4.02 kg; weighing 7.9kg of ammonium heptamolybdate in terms of MoO3A mass of about 6.42 kg; weighing 22.43kg of ammonium tungstate, which is converted into WO3A mass of about 20.58 kg; 77kg of ferrous acetate is weighed and converted into Fe2O3A mass of about 35.5 kg;
conductive component (c): 30kg of graphene;
and (3) a cocatalyst: weighing 30kg of copper oxide and 30kg of tantalum pentoxide;
carrier: 270kg of titanium dioxide, 30kg of aluminum oxide and 120kg of silicon dioxide are weighed.
(2) Same as example 1
The resistivity of the in-situ regenerated SCR catalyst prepared by the embodiment is 4.5 omega.m, the denitration efficiency can reach 70% at the working temperature of 100 ℃, then the denitration efficiency can reach more than 90% at 150 ℃ along with the increase of the working temperature, and then the denitration efficiency is basically stabilized at 95% along with the increase of the working temperature; the catalyst of the embodiment preferably has the working temperature of 100-350 ℃.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 5 and the attached drawing 7 in detail, wherein the ordinate of the attached drawing 7 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 5
Figure BDA0002849461360000131
Example 6
(1) Preparing materials: total catalyst mass 600kg
Active components: 487.5kg of manganese nitrate solution is weighed, and the equivalent is MnO2A mass of about 120.07 kg; weighing 65kg of ferrous acetate, which is converted into Fe2O3A mass of about 29.95 kg;
conductive component (c): 12kg of graphene, 30kg of graphite and 18kg of carbon fiber;
and (3) a cocatalyst: weighing 45.36kg of cerium nitrate, which is equivalent to 18kg of cerium oxide and 30kg of niobium pentoxide;
carrier: 240kg of titanium dioxide and 102kg of silicon dioxide are weighed.
(2) Same as example 1
The in-situ regeneration SCR catalyst prepared by the embodiment has the resistivity of 5.8 omega-m, the denitration efficiency can reach 73% at the working temperature of 100 ℃, then along with the improvement of the working temperature, the denitration efficiency reaches more than 90% at 150 ℃, then the denitration efficiency is basically stabilized at 95% within 250 ℃, and after the temperature exceeds 250 ℃, the denitration efficiency is slightly reduced and still kept at more than 85%; the catalyst of the embodiment preferably has the working temperature of 100-350 ℃.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 6 and the attached drawing 8 in detail, wherein the ordinate of the attached drawing 8 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 6
Figure BDA0002849461360000141
Example 7
(1) Preparing materials: total catalyst mass 600kg
Active components: weighing 38.7kg of ammonium metavanadate in terms of V2O5A mass of about 30 kg; weighing 22.14kg of ammonium heptamolybdate in terms of MoO3A mass of about 18 kg;26.16kg of ammonium tungstate is weighed and converted into WO3A mass of about 24 kg;
conductive component (c): 30kg of carbon black, carbon fiber and graphite respectively;
and (3) a cocatalyst: weighing 24kg of copper oxide, 18kg of lanthanum oxide and 30kg of tantalum pentoxide;
carrier: 300kg of titanium dioxide and 66kg of aluminum oxide are weighed.
(2) Same as example 1
The in-situ regeneration SCR catalyst prepared by the embodiment has the resistivity of 2.5 omega-m, the denitration efficiency can reach 50% at the working temperature of 100 ℃, then the denitration efficiency gradually rises with the increase of the working temperature, the denitration efficiency reaches more than 90% at 200 ℃, and then the denitration efficiency is basically stabilized at more than 95% with the increase of the working temperature; the catalyst of the embodiment preferably has the working temperature of 100-350 ℃.
The denitration activity of the regenerated catalyst is almost unchanged from that of the fresh catalyst, and is shown in the following table 7 and the attached drawing 9 in detail, wherein the ordinate of the attached drawing 9 is denitration efficiency in unit%; the abscissa is the denitration temperature in units ℃.
TABLE 7
Figure BDA0002849461360000151
As can be seen from the test data of the above examples 1 to 7, the in-situ regenerated SCR catalyst provided by the technical scheme of the present invention can be used for in-situ regeneration after poisoning the low-temperature SCR catalyst, and the low-temperature SCR catalyst has good low-temperature denitration activity, and the low-temperature denitration activity after in-situ regeneration is equivalent to that of a fresh catalyst, and almost no attenuation occurs.
The features of the invention claimed and/or described in the specification may be combined, and are not limited to the combinations set forth in the claims by the recitations therein. The technical solutions obtained by combining the technical features in the claims and/or the specification also belong to the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims (13)

1. A catalyst composition comprising a conductive component, an active component, a cocatalyst and a support.
2. The catalyst composition according to claim 1, characterized in that it comprises, in mass percent: 3-20% of a conductive component, 5-30% of an active component, 1-15% of a cocatalyst and 50-90% of a carrier.
3. The catalyst composition of claim 2, wherein the conductive component is selected from at least one of graphite, graphene, carbon black, and carbon fiber; the catalyst prepared from the catalyst composition has a resistivity of 1 to 50 Ω · m.
4. The catalyst composition of claim 2 wherein the active component is selected from the group consisting of combinations of at least two of manganese, vanadium, tungsten, molybdenum and iron.
5. The catalyst composition according to claim 4, wherein the content of manganese element is 0-85% of the total content of metal elements in terms of mole percent of metal elements; the content of the vanadium element accounts for 0-60% of the total content of the metal elements; the content of the tungsten element accounts for 0-45% of the total content of the metal elements; the content of the molybdenum element accounts for 0-40% of the total content of the metal elements; the content of the iron element accounts for 0-50% of the total content of the metal elements; the total amount of the metal elements is 100%.
6. The catalyst composition of claim 2 wherein said promoter is selected from at least one of copper, cerium, lanthanum, bismuth, niobium and tantalum.
7. The catalyst composition of claim 2, wherein the carrier is at least one member selected from the group consisting of titanium dioxide, aluminum trioxide, zirconium dioxide, and silicon dioxide.
8. The catalyst composition according to claim 7, wherein the mass of the titanium dioxide is 60 to 100% of the total mass of the carrier.
9. A method for preparing an SCR catalyst, characterized in that the SCR catalyst is obtained by mixing, pugging, aging, extruding, drying, calcining and cutting the catalyst composition according to any one of claims 1 to 8.
10. An SCR catalyst prepared by the method according to claim 9, having a resistivity of 1 to 50 Ω -m.
11. An in-situ regenerated catalyst, comprising:
a catalyst which is the SCR catalyst of claim 10;
conductive adhesive coated on both ends of the catalyst; assembling the catalyst coated with the conductive adhesive into a catalyst module;
and the electrodes are arranged on the conductive adhesive at the two ends of the catalyst module.
12. The preparation method of the in-situ regenerated catalyst is characterized by comprising the following steps of:
1) coating conductive glue on both ends of the SCR catalyst according to claim 10;
2) assembling the SCR catalyst coated with the conductive adhesive into a catalyst module;
3) electrodes are disposed on the conductive gel of the catalyst module.
13. A method of regenerating an in situ regenerated catalyst, wherein the in situ regenerated catalyst is the SCR catalyst of claim 11; the in-situ regeneration steps of the SCR catalyst are as follows: and applying voltage to the two electrodes to decompose the ammonium bisulfate covering the catalyst through an electrothermal effect.
CN202011533792.0A 2020-12-21 2020-12-21 Catalyst composition, SCR catalyst and preparation method thereof, in-situ regenerated catalyst and preparation method and regeneration method thereof Pending CN112642438A (en)

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Application publication date: 20210413