CN106076358B - A kind of cement industry low temperature SCR denitration catalyst and preparation method thereof - Google Patents
A kind of cement industry low temperature SCR denitration catalyst and preparation method thereof Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The present invention relates to a kind of cement industry low temperature SCR denitration catalyst and preparation method thereof, the catalyst is using lanthana and/or iron oxide as catalytic active component, using the manganese oxide either mixture of yttrium oxide and/or praseodymium oxide and manganese oxide as co-catalyst, using titanium dioxide and/or aluminium oxide as carrier；On the basis of carrier quality, the mass percentage of active component is 0.5%~15%, and the mass percentage of co-catalyst is 5%~35%.Active component, co-catalysis ion presoma composite solution, carrier and organic forming agent are stirred evenly, are kneaded, aging, extrusion molding, is made through drying, roasting.The catalytic component is environmental-friendly, and low temperature removes NOxHigh-efficient, active temperature windows are wide, and high mechanical strength, preparation process is simple, at low cost.At 130 DEG C in SCR denitration efficiency > 85%, 170~250 DEG C denitration efficiency it is equal > 94%, up to 99.8%.Catalyst cost performance of the present invention is high, especially suitable for cement plant low-temperature denitration of flue gas.
Description
Technical field
The present invention relates to a kind of cement industry low temperature SCR denitration catalyst and preparation method thereof, belong to environment protection catalytic material
Material and air contaminant treatment field, especially suitable for cement industry low-temperature denitration of flue gas.
Background technique
Nitrogen oxides (NOx) it is one of origin causes of formation of pollutants such as haze, acid rain, seriously endanger human health and ecological ring
Border.Cement plant NOxDischarge is only second to coal-burning power plant, becomes the key industry of air contaminant treatment.Currently, cement industry denitration skill
Art is mainly selective non-catalytic reduction method (SNCR), and such method denitration efficiency is not high and the escaping of ammonia is severe, operating cost is high.
Therefore, urgent for the denitration technology demand of cement industry research and development efficiently, inexpensive.Selective catalytic reduction (SCR) denitration skill
Art is high-efficient, stability is good, becomes the mainstream technology and developing direction of domestic and international industrial applied research, and the existing cement plant of foreign countries makes
With SCR denitration technology.SCR technology core is denitrating catalyst, and that domestic and international application is most at present is the toxic V of medium temperature2O5
(WO3)/TiO2Catalyst, because of V2O5Hypertoxic, soluble easily in water, discarded vanadium titanium denitrating catalyst can pollute environment again, by national ring
Guarantor portion is classified as dangerous waste.
Cement industry medium temperature flue gas section dust content is very high, easily causes catalyst blockage, also builds without enough spaces
If middling temperature DeNOx facility；In addition cement plant profit is low compared with coal-burning power plant, under the premise of not clear environmental protection subsidy, at present
Cement plant can not indiscriminately imitate the SCR denitration facility of coal-burning power plant.But SNCR denitration technology has been implemented in full in cement plant, warp
Flue gas hardly sulfur-bearing, dust content after SNCR denitration, dedusting is few, especially suitable for low temperature SCR denitration.It is existing big both at home and abroad
Amount patent discloses various types of denitrating catalysts and its preparation process.Patent (CN201410238241.X) uses titanium tungsten molybdenum
For powder as carrier, vanadium oxide is active component, and zinc oxide is that a kind of cement kiln flue gas SCR denitration catalyst is made in auxiliary agent, should
Catalyst is higher (200~280 DEG C) using flue-gas temperature；Patent (CN201210546836.2) by vanadium oxide and heteropoly acid substep
It is carried on carrier nano-titanium dioxide, so that the preferable denitrating catalyst of alkali resistant metal poisoning ability be prepared；On but
Two patents are stated using hypertoxic vanadium oxide as active component, easily cause secondary pollution.Patent (CN201310153273.5) and
(CN201310153875.0) being all made of manganese cerium is active component, and catalyst denitration activity is high and alkali resistant metal poisoning ability is strong；
Patent (CN201310693174.6), as active component, adds tungsten using metal oxides such as manganese iron copper ceriums, molybdenum multi-acid salt is made
For auxiliary agent, carrier then uses the metal oxides such as titanium aluminium silicon, and the low-temperature denitration catalyst of preparation is in 125~200 DEG C of temperature ranges
Interior denitrification rate is up to 90%；Patent (CN201310480494.3) uses Ti-Si composite oxide for carrier, and manganese oxide is activity
Component, the metal oxides such as cerium nickel are as auxiliary agent, and the catalyst denitration activity is high and alkali resistant metal poisoning ability is strong；On but
It is not strong to state manganese active component water resistant capability of influence in patent.
Summary of the invention
The purpose of the present invention is being directed to the current situation and existing problems of existing cement industry denitration, and it is low to propose cement industry
Warm SCR denitration catalyst, it is a further object of the present invention to provide the preparation methods of above-mentioned catalyst, especially suitable for existing
The low-temperature flue gas depth denitration in SNCR denitration cement plant.
The technical solution of the present invention is as follows: a kind of cement industry low temperature SCR denitration catalyst, it is characterised in that with lanthana
And/or iron oxide is catalytic active component, is to help with the manganese oxide either mixture of yttrium oxide and/or praseodymium oxide and manganese oxide
Catalyst, using titanium dioxide and/or aluminium oxide as carrier；On the basis of carrier quality, the mass percentage of active component is
0.5%~15%, the mass percentage of co-catalyst is 5%~35%.
It is preferred that the elemental mole ratios (Y and/Pr:Mn) of yttrium and/or praseodymium and manganese are (0~0.5) in above-mentioned co-catalyst: 1.
The present invention also provides the preparation method of above-mentioned cement industry low temperature SCR denitration catalyst, specific steps
Are as follows:
(1) preparation of active component precursor solution
One or both of lanthanum salt or molysite are weighed, deionized water is added and is placed in thermostat water bath stirring until solution is in
Clear shape, obtains solution A；
(2) co-catalyst presoma solion configures
It weighs manganese salt or yttrium salt and/or praseodymium salt and the mixture of manganese salt is added in deionized water and mixes；It is preferred that manganese salt
The mass ratio of (or mixture of yttrium salt and/or praseodymium salt and manganese salt)/deionized water is 1:(0.1~0.4), it then stirs evenly straight
It is in clear shape to solution, co-catalyst presoma solion is made；
(3) preparation of carrier
It weighs one or both of titanium source powder or silicon source powder and stirs evenly；
(4) weighing for additive is formed
Weigh molding additive；
(5) on the basis of carrier quality, by active component oxide, co-catalyst oxide and molding additive difference
The mass percent for accounting for carrier quality is 0.5~15%, 5~35% and 0.1~0.8%, by active component made from step (1)
Co-catalyst presoma solion made from presoma solion and step (2) mixing, after stirring, then with step (4)
Weighed additive is added together in carrier made from step (3), and stirring pugging is put in air dry oven and protects after aging
Temperature is dry；Obtain catalyst green body；
(6) roasting of catalyst
Catalyst green body made from step (5) is placed in roast in Muffle furnace under oxidizing atmosphere, cement industry low temperature is made
SCR denitration catalyst.
Lanthanum salt described in preferred steps (1) is lanthanum nitrate or lanthanum chloride；The molysite is ferric nitrate or iron chloride；Step
Suddenly manganese salt described in (2) is manganese nitrate；The praseodymium salt is praseodymium nitrate or praseodymium chloride；The yttrium salt source be yttrium nitrate or
Yttrium chloride.
The temperature of thermostat water bath described in preferred steps (1) is 40~60 DEG C, and mixing time is 20~30min.
Titanium source described in preferred steps (3) is titanium dioxide or titanyl sulfate；The silicon source is aluminium oxide or intends thin
Diaspore.
Molding additive described in preferred steps (4) be carboxylic propyl methocel, carboxymethyl cellulose, glycerine or
One or more of acetamide.
Drying temperature in preferred steps (5) is 80~100 DEG C, and drying time is 1~4h；The mixing time is 20
~30min；Maturing temperature in step (6) is 500~600 DEG C, keeps the temperature 1.5~3h.
Catalytic reaction condition and result of the invention: 10ml catalyst sample is taken to be packed into catalyst performance evaluation reaction unit
In, it is passed through simulator and carries out activity rating.The composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2
(6vol.%), N2For carrier gas, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, total gas flow rate
For 833ml/min.Denitration efficiency > 85% in 130~250 DEG C, up to 99.8%.
The utility model has the advantages that
Catalyst denitration efficiency prepared by the present invention is high, and active temperature section is wide, has in 120~250 DEG C efficient
Low temperature SCR denitration activity.It is compared with existing cement industry denitrating catalyst technology, catalyst system component environment friend
Good, preparation process is simple, and cost is relatively low, and cost performance is high, while mechanical strength with higher, is applicable in existing SNCR denitration cement
The low-temperature flue gas depth denitration of factory.
Detailed description of the invention
Fig. 1 is catalyst denitration activity change curve prepared by Examples 1 to 3；
Fig. 2 is catalyst denitration activity change curve prepared by embodiment 4~8；
Fig. 3 is catalyst denitration activity change curve prepared by embodiment 9.
Specific embodiment
Embodiment 1
(1) preparation of active component precursor solution
1.26g Fe(NO3)39H2O is weighed, 6.30g deionized water is added and is placed in 40 DEG C of thermostat water bath stirring 20min extremely
Solution is in clear shape, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 20.58g manganese nitrate solution and the mixing of 3.16g deionized water is added, before then stirring evenly obtained co-catalyst
Drive body solion；
(3) preparation of catalyst carrier
It weighs 30.00g titanium dioxide and 20.00g aluminium oxide is stirred evenly as catalyst carrier；
(4) weighing for additive is formed
0.25g carboxylic propyl methocel is weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 1%, 10%, 0.5%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 30min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 1h in 80 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 500 DEG C of roasting 2h in Muffle furnace in air atmosphere, sample is made；
(7) denitrification rate is tested: simulating the composition of gas are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2For
Carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas always flows
Amount is 833ml/min.Test result is shown in Fig. 1, and denitrification rate is 70.69~98.98% in 110~250 DEG C.
Embodiment 2:
(1) preparation of active component precursor solution
1.68g ferric chloride hexahydrate is weighed, 2.52g deionized water is added and is placed in 60 DEG C of thermostat water bath stirring 20min extremely
Solution is in clear shape, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 20.58g manganese nitrate solution and the mixing of 2.06g deionized water is added, before then stirring evenly obtained co-catalyst
Drive body solion；
(3) preparation of catalyst carrier
50.00g titanium dioxide is weighed as catalyst carrier；
(4) weighing for additive is formed
0.15g carboxymethyl cellulose and 0.10g glycerine are weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 2%, 10%, 0.5%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 30min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 2h in 100 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 600 DEG C of roasting 1.5h in Muffle furnace in air atmosphere, sample is made
Product；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in that Fig. 1, catalyst are 5000h in GHSV-1, under conditions of ammonia nitrogen ratio is 1,110~
Denitrification rate is 68.49~98.07% in 250 DEG C.
Embodiment 3:
(1) preparation of active component precursor solution
5.04g Fe(NO3)39H2O is weighed, 5.04g deionized water is added and is placed in 40 DEG C of thermostat water bath stirring 30min extremely
Solution is in clear shape, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 10.29g manganese nitrate solution and the mixing of 4.12g deionized water is added, before then stirring evenly obtained co-catalyst
Drive body solion；
(3) preparation of catalyst carrier
It weighs 60.00g titanyl sulfate and 26.67g boehmite is stirred evenly as catalyst carrier；
(4) weighing for additive is formed
0.15g carboxymethyl cellulose and 0.10g acetamide are weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 4%, 5%, 0.5%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 20min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 2h in 80 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 500 DEG C of roasting 3h in Muffle furnace in air atmosphere, sample is made；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 1, and denitrification rate is 67.03~98.17% in 110~250 DEG C.
Embodiment 4
(1) preparation of active component precursor solution
0.66g lanthanum nitrate hexahydrate is weighed, 3.30g deionized water is added and is placed in 40 DEG C of thermostat water bath stirring 30min extremely
Solution is in clear shape, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 20.58g manganese nitrate solution and the mixing of 3.16g deionized water is added, before then stirring evenly obtained co-catalyst
Drive body solion；
(3) preparation of catalyst carrier
It weighs 30.00g titanium dioxide and 20.00g aluminium oxide is stirred evenly as catalyst carrier；
(4) weighing for additive is formed
0.25g carboxylic propyl methocel and 0.05g glycerine are weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 0.5%, 10%, 0.6%, and active component solution made from step (1) and step (2) are made
The mixing of co-catalyst presoma, stir 30min, it is obtained that step (3) be then added together with step (4) weighed additive
Carrier, stirring pugging are put in heat preservation and dryness 3h in 100 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 600 DEG C of roasting 1.5h in Muffle furnace in air atmosphere, sample is made
Product；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 2, and denitrification rate is 68.31~99.82% in 110~250 DEG C.
Embodiment 5
(1) preparation of active component precursor solution
It weighs 0.75g lanthanum chloride, 6.60g deionized water is added is placed in 60 DEG C of thermostat water baths and stir 20min to solution and be in
Clear shape obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 20.58g manganese nitrate solution and the mixing of 2.96g deionized water is added in six nitric hydrate yttrium of 7.81g, then stir
Uniformly obtained co-catalyst presoma solion；
(3) preparation of catalyst carrier
It weighs 30.00g titanium dioxide and 20.00g aluminium oxide is stirred evenly as catalyst carrier；
(4) weighing for additive is formed
0.40g carboxylic propyl methocel is weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 1%, 15%, 0.8%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 30min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 4h in 80 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 500 DEG C of roasting 3h in Muffle furnace in air atmosphere, sample is made；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 2, and denitrification rate is 69.78~99.08% in 110~250 DEG C.
Embodiment 6
(1) preparation of active component precursor solution
2.64g lanthanum nitrate hexahydrate is weighed, 2.64g deionized water is added and is placed in 40 DEG C of thermostat water bath stirring 20min extremely
Solution is in clear shape, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 72.03g manganese nitrate solution and the mixing of 7.21g deionized water is added, before then stirring evenly obtained co-catalyst
Drive body solion；
(3) preparation of catalyst carrier
50.00g titanium dioxide is weighed as catalyst carrier；
(4) weighing for additive is formed
0.05g carboxylic propyl methocel is weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 2%, 35%, 0.1%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 30min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 4h in 80 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 500 DEG C of roasting 3h in Muffle furnace in air atmosphere, sample is made；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 2, and denitrification rate is 69.49~99.07% in 110~250 DEG C.
Embodiment 7
(1) preparation of active component precursor solution
10.56g lanthanum nitrate hexahydrate is weighed, 10.56g deionized water is added and is placed in 40 DEG C of thermostat water bath stirring 20min
It is in clear shape to solution, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
Six nitric hydrate praseodymium of 20.58g manganese nitrate solution and 6.63g is weighed, the mixing of 2.86g deionized water is added, then stirs
Mix uniformly obtained co-catalyst presoma solion；
(3) preparation of catalyst carrier
50.00g titanium dioxide is weighed as catalyst carrier；
(4) weighing for additive is formed
0.40g carboxylic propyl methocel is weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 8%, 15%, 0.8%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 30min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 1h in 80 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 500 DEG C of roasting 3h in Muffle furnace in air atmosphere, sample is made；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 2, and denitrification rate is 80.77~97.81% in 110~250 DEG C.
Embodiment 8
(1) preparation of active component precursor solution
19.80g lanthanum nitrate hexahydrate is weighed, 13.20g deionized water is added and is placed in 60 DEG C of thermostat water bath stirring 30min
It is in clear shape to solution, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
20.58g manganese nitrate solution, 1.45g praseodymium chloride and 1.73g yttrium chloride are weighed, the mixing of 2.43g deionized water is added,
Then obtained co-catalyst presoma solion is stirred evenly；
(3) preparation of catalyst carrier
It weighs 30.00g titanium dioxide and 20.00g aluminium oxide is stirred evenly as catalyst carrier；
(4) weighing for additive is formed
0.05g carboxylic propyl methocel is weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 15%, 14%, 0.1%, and active component solution made from step (1) and step (2) are made
The mixing of co-catalyst presoma, stir 30min, it is obtained that step (3) be then added together with step (4) weighed additive
Carrier, stirring pugging are put in heat preservation and dryness 4h in 100 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 500 DEG C of roasting 3h in Muffle furnace in air atmosphere, sample is made；
(6) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 2, and denitrification rate is 70.15%~97.81% in 110~250 DEG C.
Embodiment 9
(1) preparation of active component precursor solution
1.32g lanthanum nitrate hexahydrate and 1.26g Fe(NO3)39H2O are weighed, 2.58g deionized water is added and is placed in 50 DEG C of perseverances
It is in clear shape that warm water bath, which stirs 20min to solution, obtains active component precursor solution；
(2) co-catalyst presoma solion configures
It weighs 20.58g manganese nitrate solution and the mixing of 3.16g deionized water is added, before then stirring evenly obtained co-catalyst
Drive body solion；
(3) preparation of catalyst carrier
50.00g aluminium oxide is weighed as catalyst carrier；
(4) weighing for additive is formed
0.05g carboxylic propyl methocel is weighed as molding additive；
It (5) is 100% meter, active component oxide, co-catalyst oxide and molding additive according to carrier quality
Three's mass percent is respectively 2%, 10%, 0.1%, and active component solution made from step (1) and step (2) is obtained
The mixing of co-catalyst presoma, stirs 30min, and step (3) load obtained is then added together with step (4) weighed additive
Body, stirring pugging are put in heat preservation and dryness 4h in 80 DEG C of air dry ovens after aging dry in the shade；
(6) roasting, molding of catalyst
Catalyst green body made from step (5) is placed in 600 DEG C of roasting 1.5h in Muffle furnace in air atmosphere, sample is made
Product；
(7) denitrification rate is tested: the composition of the gas of simulation are as follows: NO (600ppm), NH3(600ppm)、O2(6vol.%), N2
For carrier gas, catalyst amount 10ml, catalyst grain size are as follows: diameter 3.5mm, long 3.5-5.5mm, GHSV 5000h-1, gas is total
Flow is 833ml/min.Test result is shown in Fig. 3, and denitrification rate is 76.01~98.35% in 110~250 DEG C.
Claims (6)
1. a kind of cement industry low temperature SCR denitration catalyst, it is characterised in that using lanthana as catalytic active component, with oxidation
The manganese either mixture of yttrium oxide and/or praseodymium oxide and manganese oxide is co-catalyst, is to carry with titanium dioxide and/or aluminium oxide
Body；On the basis of carrier quality, the mass percentage of active component is 0.5%~15%, and the quality percentage of co-catalyst contains
Amount is 5%~35%；It is prepared by following methods, the specific steps are that:
(1) preparation of active component precursor solution
Lanthanum salt is weighed, deionized water is added and is placed in thermostat water bath stirring until solution obtains solution A in clear shape；Its
Described in thermostat water bath temperature be 40~60 DEG C, mixing time be 20~30min；
(2) co-catalyst presoma solion configures
It weighs manganese salt or yttrium salt and/or praseodymium salt and the mixture of manganese salt is added in deionized water and mixes；Then it stirs evenly
Until solution is in clear shape, co-catalyst presoma solion is made；
(3) preparation of carrier
It weighs one or both of titanium source powder or silicon source powder and stirs evenly；
(4) weighing for additive is formed
Weigh molding additive；
(5) on the basis of carrier quality, load is accounted for respectively by active component oxide, co-catalyst oxide and molding additive
The mass percent of weight is 0.5~15%, 5~35% and 0.1~0.8%, by active component forerunner made from step (1)
The mixing of co-catalyst presoma solion made from body solion and step (2), after stirring, then weighs with step (4)
Additive be added in carrier made from step (3) together, stir pugging, after aging, be put in air dry oven keep the temperature it is dry
It is dry；Obtain catalyst green body；
(6) roasting of catalyst
Catalyst green body made from step (5) is placed in roast in Muffle furnace under oxidizing atmosphere, cement industry low-temperature SCR is made
Denitration catalyst.
2. cement industry low temperature SCR denitration catalyst according to claim 1, it is characterised in that yttrium in co-catalyst
And/or the elemental mole ratios of praseodymium and manganese are (0~0.5): 1.
3. cement industry low temperature SCR denitration catalyst according to claim 1, it is characterised in that described in step (1)
Lanthanum salt be lanthanum nitrate or lanthanum chloride；Manganese salt described in step (2) is manganese nitrate；The praseodymium salt is praseodymium nitrate or chlorination
Praseodymium；The yttrium salt source is yttrium nitrate or yttrium chloride.
4. cement industry low temperature SCR denitration catalyst according to claim 1, it is characterised in that described in step (3)
Titanium source be titanium dioxide or titanyl sulfate；The silicon source is aluminium oxide or boehmite.
5. cement industry low temperature SCR denitration catalyst according to claim 1, it is characterised in that described in step (4)
Molding additive be one or more of carboxylic propyl methocel, carboxymethyl cellulose, glycerine or acetamide.
6. cement industry low temperature SCR denitration catalyst according to claim 1, it is characterised in that dry in step (5)
Dry temperature is 80~100 DEG C, and drying time is 1~4h；The mixing time is 20~30min；Roasting temperature in step (6)
Degree is 500~600 DEG C, keeps the temperature 1.5~3h.
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| CN108043209A (en) * | 2017-11-28 | 2018-05-18 | 辽宁鑫隆科技有限公司 | A kind of landfill leachate is coupled method of denitration |
| CN107890777A (en) * | 2017-11-28 | 2018-04-10 | 辽宁鑫隆科技有限公司 | A kind of catalytic-reduction denitrified method of dry method |
| CN111939950A (en) * | 2019-05-16 | 2020-11-17 | 新淳(上海)环保科技有限公司 | Denitration catalyst for circulating fluidized bed boiler and preparation method thereof |
| CN110252323B (en) * | 2019-05-31 | 2021-08-17 | 南京工业大学 | Denitration and demercuration double-effect catalyst and preparation method thereof |
| CN111135821A (en) * | 2019-12-17 | 2020-05-12 | 安徽元琛环保科技股份有限公司 | Self-heating coating type low-temperature denitration catalyst and preparation method thereof |
| CN111514886A (en) * | 2020-04-27 | 2020-08-11 | 浙江工商大学 | Medium-low temperature SCR denitration catalyst with composite microsphere structure and application thereof |
| CN111905721B (en) * | 2020-09-01 | 2022-09-13 | 天津大学 | Catalyst for low-temperature denitration and demercuration of titanium dioxide nano array and preparation method thereof |
| CN113244930A (en) * | 2021-02-24 | 2021-08-13 | 南京大学 | Mn-based catalyst for low-temperature denitration and preparation method and application thereof |
| CN113083286B (en) * | 2021-04-08 | 2023-01-06 | 安徽元琛环保科技股份有限公司 | Preparation method of ultra-high temperature denitration catalyst |
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