CN109833907A - A kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst having storage ammonia performance - Google Patents
A kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst having storage ammonia performance Download PDFInfo
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Abstract
The present invention provides a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance; the catalyst is multilayered structure; specifically: using cordierite honeycomb ceramic as matrix; it is composed of active ingredient layer, resistant to sulfur protective layer and ammonia storage absorbent coating; the resistant to sulfur protective layer and ammonia storage absorbent coating are molecular screen material, and the active ingredient layer is V2O5‐WO3‐TiO2‐SiO2Composite oxide coating.The method have the characteristics that catalyst is multilayered structure, it is made of active ingredient layer, ammonia storage binding molecule sieve coating and resistant to sulfur protective layer.By the various combination mode of these functional layers, catalyst has good low-temperature denitration catalytic activity, ammonia storage performance and low temperature Sulfur tolerance.The catalyst is suitable for the characteristics of coke oven flue gas low temperature, Gao Shui, sulfur-bearing and nitrogen oxides period severity change, and can effectively prevent the leakage of ammonia.
Description
Technical field
The invention belongs to field of environment protection, and in particular to a kind of low temperature resistant to sulfur coke oven flue gas for having storage ammonia performance is de-
Denox catalyst.
Background technique
Environmental Protection Department has issued " coking chemistry emission of industrial pollutants standard " (GB16171- on June 27th, 2012
2012, hereinafter referred to as new standard), this be after 2011 " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) it
Afterwards, Environmental Protection Department issues the discharge standard for having significant impact to ambient air quality again.It is required that newly-built coal chemical enterprise
The implementation new standard from October 1st, 2012, existing coal chemical enterprise reach the contamination control of newly-built enterprise on January 1st, 2015
It is horizontal.
New standard has received SO tight significantly2, NOx emission limit, it is desirable that SO in coke oven chimney combustion tail gas2Concentration is less than
50mg/m3, nitrous oxides concentration is less than 500mg/m3, key area specially requires discharged nitrous oxides concentration and is less than 150mg/m3。
Nitrous oxides concentration is generally in 800~1200mg/m in current country's coal chemical enterprise coke oven flue gas3Between, significantly
More than the emission limit that new standard requires, flue gas needs denitration process that can just accomplish nitrogen oxides qualified discharge.
In existing method of denitration, selective catalytic reduction method be removal efficiency highest, technology it is the most mature, using most
For a kind of extensive method.Its principle is that ammonia is added in flue gas, under the effect of the catalyst ammonia and nitrogen oxides (NOx)
It reacts, NOx is reduced to N2.Ammonia with NOx is reacted with equimolar ratio during the reaction.If ammonia is added
It is excessive, then unreacted NH3It will be discharged by flue gas, and cause the escaping of ammonia.The escaping of ammonia can make the upstream device of Benitration reactor
At there is also SO in influence, especially flue gas2When, the two reacts to form sulphur ammonium salts substances in temperature lower, blocking
Pipeline is adhered on the heat-transfer area of waste heat boiler or air preheater the heat exchange efficiency for reducing these heat exchange equipments.Therefore de-
Generally ammonia residual is controlled according to NOx concentration in flue gas and flue gas flow in nitre reaction, and ammonia nitrogen ratio (NH is set3/ NOx moles
Than) it is between 0.9~0.95, so that the escapement ratio of Benitration reactor outlet ammonia is less than 5ppm.
Coke oven commutation is the distinctive production operation of coking, refer specifically to ascending air coal gas and air and down current it is useless
Gas carries out direction transformation by exchange transmission gear timing (general interval 20min or 30min).Before commutation, coke oven down current stores
Hot cell absorbs high exhaust temperatures, and ascending air regenerative chamber is coal gas and air preheat；After commutation, the down current that former exhaust gas passes through stores
Hot cell starts as coal gas and air preheat, and former ascending air regenerative chamber now flows through exhaust gas, can absorb waste-gas heat, thus protect
The effective use of its heat is demonstrate,proved.No matter coke oven uses any heated by gas, and the program of exchange will be passed through sequentially
Three basic processes are gone through, that is, is closed the door (turn out the gas), is mentioned stone roller (exchange exhaust gas and air), opens the door (gas delivery), it be in strict accordance with this
A precedence carries out.Nitrous oxides concentration variation acutely, such as shows that the factory commutates to the monitoring of certain coke-oven plant in commutation process
Period is 30 minutes, and in last two minutes of a commutation cycle, nitrous oxides concentration is by 1500mg/m3Acutely it is reduced to
400mg/m3, temperature also has 15 DEG C or so of the range of decrease.When next cycle starts, nitrous oxides concentration starts gradually to increase again
Add, 3~5 minutes or so time is probably needed to be restored to 1500mg/m3Left and right.In addition, nitrogen oxides in one cycle
Also often there is the fluctuation in 10~20% amplitudes in concentration.The fluctuation of coke oven flue gas entrance NOx content is big and variation is fast, and flue gas by
The residence time of denitration reaction area entrance to outlet is short, and along with spray ammonia reaction has regular hour lag, regulating valve is substantially
Degree frequent movement will lead to automatic control and be difficult to reach an opposite stable state.
Coke oven flue gas temperature is lower, contains a certain amount of SO simultaneously2, SO under low temperature2Inevitably and in penetrating tail gas
NH3It reacts and generates sulphur ammonium substance.The duct of these substances meeting blocking catalyst, causes the activity of catalyst to reduce.
The low temperature sulfur poisoning resistance for improving catalyst is also the key of catalyst functionization.
Summary of the invention
Effectively to solve the existing above problem during coke oven flue gas low-temperature denitration, present invention particularly provides one kind to have
The low temperature resistant to sulfur denitrating catalyst of ammonia storage function.
A kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst having storage ammonia performance, the catalyst are multilayered structure, tool
Body are as follows: using cordierite honeycomb ceramic as matrix, successively it is made of ammonia storage absorbent coating, active ingredient layer and resistant to sulfur protective layer,
The resistant to sulfur protective layer and ammonia storage absorbent coating are molecular screen material, and the active ingredient layer is V2O5‐WO3‐TiO2‐
SiO2Composite oxide coating；
Molecular screen material used is selected from ZSM-5 in ammonia storage binding molecule sieve coating and resistant to sulfur protective layer, and Beta points
Son sieve, Y type molecular sieve, aluminium phosphate molecular sieve, SAPO type molecular sieve or the mixture between them.
The Si/Al ratio of zeolitic material used in the ZSM-5 molecular sieve and Beta molecular sieve is between 15~100, preferably Si/
Al ratio is between 15~30.
The SAPO molecular sieve；Its material molar ratio are as follows: (0.1~1.0) SiO2:1.0Al2O3:(0.8‐1.2)P2O5:
(2.0-4.5) TEA:(20-80) H2O。
Carrying capacity is in 40~80g/L on the molecular screen material of resistant to sulfur protective layer and ammonia storage absorbent coating.
The upper carrying capacity of composite oxide coating is in 150~250g/L.
A kind of preparation method for the low temperature resistant to sulfur coke oven flue gas denitrating catalyst having storage ammonia performance, according to the following steps
It carries out:
(1) cordierite honeycomb ceramic is immersed in first in the aqueous slurry containing molecular sieve, is taken out after 30~120 seconds, used
Compressed air purging, 500 DEG C of honeycombs for obtaining coating bottom strata after roasting 2~4 hours as one layer of molecular screen material after microwave drying
Ceramic structure A；
(2) ceramic honeycomb structure A is continued to be immersed in containing ammonium metavanadate, ammonium paratungstate, TiO2, silica solution it is aqueous
It in slurry, is taken out after 30~120 seconds, with compressed air purging, obtains coating bottom after roasting 2~4 hours for 500 DEG C after microwave drying
Layer is one layer of molecular screen material, upper layer V2O5‐WO3‐TiO2‐SiO2The ceramic honeycomb structure B of composite oxide coating；
(3) ceramic honeycomb structure B is immersed in again in the aqueous slurry containing molecular sieve, is taken out after 30~120 seconds, used
Compressed air purging, after microwave drying 500 DEG C roasting 2~4 hours after obtain coating bottom strata be one layer of molecular screen material, middle layer
For V2O5‐WO3‐TiO2‐SiO2Composite oxide coating, top layer are the ceramic honey comb knot catalysis of one layer of molecular sieve coating again
Agent.
A kind of application for the low temperature resistant to sulfur coke oven flue gas denitrating catalyst having storage ammonia performance.Catalyst degradation coke
The escaping of ammonia in kiln gas denitrification process.The catalyst improves catalyst SO anti-at low temperature2The ability of poisoning.
Catalyst of the present invention is a kind of cordierite honeycomb ceramic coating type catalyst, has multi-layer compound structure, by activity
Component layers, ammonia storage binding molecule sieve coating and resistant to sulfur protective layer composition.Pass through the various combination mode of these functional layers, catalysis
Agent has good low-temperature denitration catalytic activity and ammonia storage performance, when nitrous oxides concentration acutely reduces in denitrification process,
Ammonia nitrogen is than significantly larger than 1, and when ammonia is largely excessive, extra ammonia be can store in catalyst, when nitrogen oxides restore to
After normal value, when ammonia nitrogen ratio is less than 1, the ammonia being stored in catalyst starts to discharge, and participates in SCR reaction, makes entire one
In a commutation cycle, more preferable the acute variation situation for having adapted to nitrogen oxides in effluent.
Denitrating catalyst provided by the invention is found especially that when molecular sieve coating is in specific structure, can mention simultaneously
The anti-SO of the low temperature of high catalyst2Poisoning capability, catalyst show good low temperature resistance to SO_2.
Detailed description of the invention
Fig. 1 embodiment 1 prepares denitrification rate on catalyst and varies with temperature curve；
Fig. 2 embodiment 2 prepares nitrogen oxides mechanical periodicity dynamic experiment on catalyst and exports NO and NH3Concentration variation is bent
Line；
It is bent that Fig. 3 comparative example 1 prepares nitrogen oxides mechanical periodicity dynamic experiment outlet NO and NH3 concentration variation on catalyst
Line；
Fig. 4 embodiment 3 prepares catalyst resistant to sulfur stability experiment result；
Resistant to sulfur stability experiment result on 2 denitrating catalyst of Fig. 5 comparative example.
Specific embodiment
Denitration monolithic catalyst provided by the invention is described in further details with embodiment below, but this should not be managed
Solution is that the range of the claims of the present invention is only limitted to following embodiments.Meanwhile embodiment has been merely given as realization the invention
Part Experiment condition, but be not meant to that must satisfy these conditions can be only achieved the purpose of the present invention.
A kind of ZSM-5 molecular sieve and Beta molecular sieve are provided by molecular sieve factory, Nankai University.In some embodiments, used
The Si/Al ratio of zeolitic material is between 15~100, and in further embodiments, the Si/Al ratio of zeolitic material used is 15~30
Between.
SAPO molecular sieve is synthesized certainly by laboratory, material molar ratio are as follows: (0.1~1.0) SiO2:1.0Al2O3:(0.8‐
1.2)P2O5: (2.0-4.5) TEA:(20-80) H2O。
Embodiment 1
The preparation of catalyst pulp
1.7g ammonium metavanadate, 1.16g ethanol amine, 4.4g ammonium paratungstate is taken to be made into 40mL solution after being dissolved in water, with 30g titanium
After white powder mixing, 5g silica solution (SiO is added2Content 30%) it stirs evenly, it is small that this mixture is fitted into ball milling 3 in ball grinder
When obtain catalyst pulp.
The preparation of molecular sieve slurry
Take 10gH-ZSM-5,5g silica solution (SiO2Content 30%), 30g deionized water is uniformly mixed, this mixture is filled
Enter ball milling 3 hours in ball grinder and obtains molecular sieve aqueous slurry.
The preparation of whole denitrating catalyst
Four steps of the coating of catalyst point are completed, and dip-coating is primary on Φ 1.4 × 2.2cm cordierite honeycomb ceramic matrix first
Molecular sieve slurry, then 2 catalyst pulps of dip-coating, finally Tu Yici molecular sieve slurry again, forms catalyst activity component position
In " interlayer structure " of middle layer.Specific step is as follows:
400cpsi cordierite honeycomb ceramic is cut into the fritter of 1.4 × 2.2cm of Φ, gained molecular sieve is dipped in after weighing
In aqueous slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven, in
The cordierite honeycomb that 500 DEG C of roastings obtain one layer of molecular screen material of coating for 2 hours is warming up in Muffle furnace with 2 DEG C/min of rates
Ceramics.Molecular sieve coating weight is measured after taking out weighing as 0.2659g.Then this block ceramics is dipped in catalyst pulp, 30
Taking-up hot wind blows down remaining slurry in duct after second, then 3 minutes dry with microwave drying oven, repeats this process 1 time
The catalyst of 2 coating catalyst pulps is obtained, is warming up to 500 DEG C of roastings 2 hours in Muffle furnace with 2 DEG C/min of rates
To whole denitrating catalyst.Catalyst coat weight is measured after taking out weighing as 0.8273g.Finally this block ceramics is immersed in again
In molecular sieve slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven,
It is warming up to 500 DEG C in Muffle furnace with 2 DEG C/min of rates to roast 2 hours, weighing obtains the last layer molecular sieve layer after taking-up
Weight is 0.2278g.
The activity rating of whole denitrating catalyst
Catalyst denitration activity test method obtained are as follows: Bulk coat formula catalyst is fitted into quartz ampoule, reaction gas
Atmosphere are as follows: 500ppm NO+500ppm NH3+ 10%O2+ 18%H2O+N2, adjust raw gas flow make reaction air speed be
20000hr-1.The NO and NO of inlet and outlet are detected respectively2Concentration obtains the denitration of catalyst to calculate total conversion rate of NOx
Efficiency.Fig. 1 gives catalyst in the denitration efficiency in 200~300 DEG C of sections.
Embodiment 2
The preparation of catalyst pulp
1.1g ammonium metavanadate, 1.16g ethanol amine, 5.5g ammonium paratungstate is taken to be made into 40mL solution after being dissolved in water, with 30g titanium
After white powder mixing, 5g silica solution (SiO is added2Content 30%) it stirs evenly, it is small that this mixture is fitted into ball milling 3 in ball grinder
When obtain catalyst pulp.
The preparation of molecular sieve slurry
It takes 10gH-Beta (Si/Al=), 5g silica solution (SiO2Content 30%), 30g deionized water is uniformly mixed, by this
Mixture is fitted into ball milling 3 hours in ball grinder and obtains molecular sieve aqueous slurry.
The preparation of whole denitrating catalyst
400cpsi cordierite honeycomb ceramic is cut into the fritter of 1.4 × 2.2cm of Φ, gained molecular sieve is dipped in after weighing
In aqueous slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven, in
The cordierite honeycomb that 500 DEG C of roastings obtain one layer of molecular screen material of coating for 2 hours is warming up in Muffle furnace with 2 DEG C/min of rates
Ceramics.Molecular sieve coating weight is measured after taking out weighing as 0.2475g.Then this block ceramics is dipped in catalyst pulp, 30
Taking-up hot wind blows down remaining slurry in duct after second, then 3 minutes dry with microwave drying oven, repeats this process 1 time
The catalyst of 2 coating catalyst pulps is obtained, is warming up to 500 DEG C of roastings 2 hours in Muffle furnace with 2 DEG C/min of rates
To whole denitrating catalyst.Catalyst coat weight is measured after taking out weighing as 0.8547g.Finally this block ceramics is immersed in again
In molecular sieve slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven,
It is warming up to 500 DEG C in Muffle furnace with 2 DEG C/min of rates to roast 2 hours, weighing obtains the last layer molecular sieve layer after taking-up
Weight is 0.2569g.
Nitrogen oxides mechanical periodicity dynamic experiment
Bulk coat formula catalyst is fitted into quartz ampoule, reaction temperature is set as 280 DEG C, reaction atmosphere are as follows: 500ppm
NO+450ppmNH3+ 10%O2+N2, adjust raw gas flow and the air speed of reaction made to be 20000hr-1.When reaction operation 28 minutes
Afterwards, the flowmeter of NO is closed, the supply of NO in unstripped gas is cut off, reaction gas group becomes 450ppmNH at this time3+ 10%O2+N2,
It maintains this atmosphere 3 minutes, then opens the flowmeter of NO again, restore the supply of NO, this is a test period.It is carried out continuously two
The operation in a period detects reactor outlet NH3Concentration.
It prepares nitrogen oxides mechanical periodicity dynamic experiment on catalyst and exports NO and NH3Concentration curve is as shown in Figure 2.
As can be seen that cyclically-varying rule is presented in outlet nitrous oxides concentration in the operation in continuous 2 periods, NH is exported3It is dense
The case where degree is less than 7ppm, has been well adapted for NO concentration acute variation in reaction atmosphere.
Comparative example 1
400cpsi cordierite honeycomb ceramic is cut into the fritter of 1.4 × 2.2cm of Φ, gained catalyst is dipped in after weighing
In slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven, repeats
The catalyst for obtaining 2 coatings for this process 1 time are warming up to 500 DEG C of roastings in Muffle furnace with 2 DEG C/min of rates and obtain for 2 hours
Whole denitrating catalyst.Catalyst coat weight is measured after taking out weighing as 0.8122g.
This catalyst is equally used for nitrogen oxides mechanical periodicity dynamic experiment, Fig. 3 gives reactor outlet NO and NH3
Concentration situation of change.It can be seen that outlet NH3 concentration is quicklyd increase in some period, up in dynamic experiment
To 50ppm, the case where there are the escaping of ammonia severe overweights.
Embodiment 3
The preparation of catalyst pulp
1.1g ammonium metavanadate, 1.16g ethanol amine, 5.5g ammonium paratungstate is taken to be made into 40mL solution after being dissolved in water, with 30g titanium
After white powder mixing, 5g silica solution (SiO is added2Content 30%) it stirs evenly, it is small that this mixture is fitted into ball milling 3 in ball grinder
When obtain catalyst pulp.
The preparation of molecular sieve slurry
Take 10gSAPO-34 powder, 5g silica solution (SiO2Content 30%), 30g deionized water is uniformly mixed, this is mixed
Object is fitted into ball milling 3 hours in ball grinder and obtains molecular sieve aqueous slurry.
The preparation of whole denitrating catalyst
400cpsi cordierite honeycomb ceramic is cut into the fritter of 1.4 × 2.2cm of Φ, gained molecular sieve is dipped in after weighing
In aqueous slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven, in
The cordierite honeycomb that 500 DEG C of roastings obtain one layer of molecular screen material of coating for 2 hours is warming up in Muffle furnace with 2 DEG C/min of rates
Ceramics.Molecular sieve coating weight is measured after taking out weighing as 0.2142g.Then this block ceramics is dipped in catalyst pulp, 30
Taking-up hot wind blows down remaining slurry in duct after second, then 3 minutes dry with microwave drying oven, repeats this process 1 time
The catalyst of 2 coating catalyst pulps is obtained, is warming up to 500 DEG C of roastings 2 hours in Muffle furnace with 2 DEG C/min of rates
To whole denitrating catalyst.Catalyst coat weight is measured after taking out weighing as 0.7925g.Finally this block ceramics is immersed in again
In molecular sieve slurry, taking-up hot wind blows down remaining slurry in duct after 30 seconds, then 3 minutes dry with microwave drying oven,
It is warming up to 500 DEG C in Muffle furnace with 2 DEG C/min of rates to roast 2 hours, weighing obtains the last layer molecular sieve layer after taking-up
Weight is 0.2204g.
The test of catalyst low temperature resistance to SO_2
Bulk coat formula catalyst is fitted into quartz ampoule, reaction temperature is set as 250 DEG C, reaction atmosphere are as follows: 500ppm
NO+425ppmNH3+ 10%O2+ 18%H2O+100ppmSO2+N2, adjust raw gas flow and the air speed of reaction made to be 20000hr-1.The resistant to sulfur stability of catalyst is investigated such as Fig. 4 with this condition, gives 1000 hours test results.
As seen from the figure, within 1000 hours time, the denitration activity of catalyst keeps stablizing, removal of nitrogen oxide
Rate is always held at 85% or so, and with ammonia nitrogen than almost the same, catalyst stability is good.
Comparative example 2
With comparative example 1, the upper carrying capacity of catalyst activity component is 0.8038g for the preparation of catalyst, this catalyst is used for
The test of catalyst low temperature resistance to SO_2, Fig. 5 give 410 hours test results.It can be seen that comparative example catalyst was at 200 hours
Later activity gradually decreases, until activity has been lowered to 80% or less after 400 hours.
It is described above for illustrating the principle of the present invention and its effect, and is not intended to limit the present invention.Technology belonging to any
The technical staff in field can modify to above-described embodiment and become without prejudice in thought and scope of the invention
Change.Therefore, the scope of the present invention, should be subject to listed claim.
Claims (7)
1. a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance, it is characterised in that the catalyst is multilayer
Structure, specifically: using cordierite honeycomb ceramic as matrix, absorbent coating group is stored by active ingredient layer, resistant to sulfur protective layer and ammonia
It closes, the resistant to sulfur protective layer and ammonia storage absorbent coating are molecular screen material, and the active ingredient layer is V2O5‐
WO3‐TiO2‐SiO2Composite oxide coating；
Molecular screen material used is selected from ZSM-5 in ammonia storage binding molecule sieve coating and resistant to sulfur protective layer, Beta molecular sieve,
Y type molecular sieve, aluminium phosphate molecular sieve, SAPO type molecular sieve or the mixture between them.
2. a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance according to claim 1, special
Sign is that carrying capacity is in 40~80g/L on the molecular screen material of resistant to sulfur protective layer and ammonia storage absorbent coating.
3. a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance according to claim 1, special
Sign is the upper carrying capacity of composite oxide coating in 150~250g/L.
4. a kind of preparation of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance according to claim 1
Method, it is characterised in that follow the steps below:
(1) cordierite honeycomb ceramic is immersed in first in the aqueous slurry containing molecular sieve, is taken out after 30~120 seconds, with compression
Air purging, 500 DEG C of ceramic honey combs for obtaining coating bottom strata after roasting 2~4 hours as one layer of molecular screen material after microwave drying
Structural body A；
(2) by ceramic honeycomb structure A continue to be immersed in containing ammonium metavanadate, ammonium paratungstate, TiO2, silica solution aqueous slurry
In, it is taken out after 30~120 seconds, with compressed air purging, obtains coating bottom strata after microwave drying after roasting 2~4 hours and be for 500 DEG C
One layer of molecular screen material, upper layer V2O5‐WO3‐TiO2‐SiO2The ceramic honeycomb structure B of composite oxide coating；
(3) ceramic honeycomb structure B is immersed in again in the aqueous slurry containing molecular sieve, is taken out after 30~120 seconds, with compression
Air purging, after microwave drying 500 DEG C to obtain coating bottom strata be that one layer of molecular screen material, middle layer are after roasting 2~4 hours
V2O5‐WO3‐TiO2‐SiO2Composite oxide coating, top layer are the ceramic honey comb knot catalyst of one layer of molecular sieve coating again.
5. a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance according to claim 1 is answered
With.
6. a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance according to claim 5 is answered
With the escaping of ammonia in, it is characterised in that catalyst degradation coke oven flue gas denitrification process.
7. a kind of low temperature resistant to sulfur coke oven flue gas denitrating catalyst for having storage ammonia performance according to claim 5 is answered
With, it is characterised in that the catalyst improves catalyst SO anti-at low temperature2The ability of poisoning.
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