CN101644655B - Method and equipment for measuring bonding strength of active component coating in catalyst - Google Patents
Method and equipment for measuring bonding strength of active component coating in catalyst Download PDFInfo
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- CN101644655B CN101644655B CN2008101440893A CN200810144089A CN101644655B CN 101644655 B CN101644655 B CN 101644655B CN 2008101440893 A CN2008101440893 A CN 2008101440893A CN 200810144089 A CN200810144089 A CN 200810144089A CN 101644655 B CN101644655 B CN 101644655B
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Abstract
The invention provides a method for measuring the bonding strength of an active component coating in a catalyst, which comprises the following steps: performing gas shock on the catalyst; measuring the material drop rate of the active component coating in the catalyst; and expressing the bonding strength of the active component coating by the material dropping rate of the active component coating. The method for measuring the bonding strength of the active component coating in the catalyst can truly reflect the bonding strength of the active component coating in the catalyst in a working state. The invention also provides equipment used for the method, which can truly simulate the working state of the catalyst, so the equipment can be used for measuring the bonging strength of the active component coating in the catalyst in the working state.
Description
Technical field
The invention relates to a kind of method of measuring the cohesive strength of active component coating in the catalyzer, and the equipment that is used for this method.
Background technology
Along with the enhancing of environmental consciousness, increasingly high for the treatment requirement of vehicle exhaust, catalyzer has played crucial effects in the processing procedure of vehicle exhaust.The catalyzer that is used to handle vehicle exhaust generally comprises carrier and loads on the active component coating on the carrier; If it is lower or thermal expansion coefficient difference is excessive to load on the cohesive strength of active component coating and carrier on the carrier; Then catalyzer loads in use that active component coating on the carrier can come off and situation such as be full of cracks, thereby causes the inefficacy of catalyzer.
Therefore, the cohesive strength that loads on the active component coating on the carrier being detected exactly, is the key in the quality control process of catalyst prod.
At present, be used for that catalyzer is loaded on the method that the cohesive strength of the active component coating on the carrier detects and mainly contain hundred lattice methods of testing and sonic oscillation method.
Hundred lattice methods of testing mainly are to draw the straight line formation grid that several mutual 90 degree intersect through lancinating with hundred lattice at sample surfaces; Firmly be bonded at the Bai Ge district with adhesive tape and tear rapidly with certain angle, the grid number is recently judged the cohesive strength that loads on the active component coating on the carrier in the catalyzer with the percentage of overall grid number according to coming off.
The sonic oscillation method mainly is through sample being placed water, afterwards it is carried out ultrasonic Treatment, coming to load in the evaluate catalysts cohesive strength of the active component coating on the carrier according to the degree of coming off that loads on the active component coating on the carrier.
But the problem that above two kinds of methods exist is, the condition of detection and the actual operating conditions of catalyzer are widely different, and its testing result can't be represented the cohesive strength of active component coating under actual working state that loads on the carrier.
Therefore, a kind of method that can detect the cohesive strength of active component coating under actual working state that loads in the catalyzer on the carrier of exploitation becomes the problem that presses for solution.
Summary of the invention
The purpose of this invention is to provide a kind of method that can detect the cohesive strength of active component coating under actual working state that loads in the catalyzer on the carrier, and can simulate the duty of catalyzer and the equipment that the cohesive strength that loads on the active component coating on the carrier in the catalyzer is detected truly.
The invention provides a kind of method of measuring the cohesive strength of active component coating in the catalyzer; Wherein, This method comprises carries out gas shock to catalyzer; And the dressing drop ratio of active component coating described in the mensuration catalyzer, represent the cohesive strength of active component coating according to the dressing drop ratio of said active component coating.
The present invention also provides a kind of equipment that is used for catalyzer is carried out gas shock; Wherein, This equipment comprises: reactor 1, heating arrangement 2, attemperating unit 3 gentle stream generating apparatus; Said air-flow generating apparatus is used for generating air-flow at reactor 1, and heating arrangement 2 is used for the air-flow of reactor 1 is heated, and attemperating unit 3 is used for the temperature of the air-flow of controlling reactor 1.
The method of the cohesive strength of active component coating is through the residing in the course of the work environment of simulation catalyzer in the mensuration catalyzer provided by the invention; And make catalyzer fall material through catalyzer being carried out gas shock; Represent to load in the catalyzer cohesive strength of the active component coating on the carrier according to dressing drop ratio, load on the cohesive strength of active component coating under in working order on the carrier truly in the catalysts.
Description of drawings
Fig. 1 is the synoptic diagram of equipment of the method for the cohesive strength that can be used for mensuration catalyzer active component coating provided by the invention;
When Fig. 2 is steady state value for the air speed of the water cut of air-flow and air-flow, the exemplary graphs that the temperature of air-flow changes between 100-1000 ℃;
When Fig. 3 is steady state value for the air speed of the air temperature and current of air-flow, the exemplary graphs that the water cut of air-flow changes between 1-90 volume %;
When Fig. 4 was steady state value for the water cut of the air temperature and current of air-flow, the air speed of air-flow was at 1000-100000h
-1Between the exemplary graphs that changes.
Embodiment
The method of the cohesive strength of active component coating comprises catalyzer is carried out gas shock in the mensuration catalyzer provided by the invention; And the dressing drop ratio of active component coating described in the mensuration catalyzer, represent the cohesive strength of active component coating according to the dressing drop ratio of said active component coating.
According to the present invention, the condition of said gas shock can be simulated the condition of the working environment of catalyzer truly for various, and for example, the condition of gas shock can comprise: the water cut of air-flow is 1-90 volume %, and the air speed of air-flow is 1000-100000h
-1, the temperature of air-flow is 100-1000 ℃, and the attack time is 1-1000 hour, and said air speed is meant the gas volume of the catalyzer of per hour flowing through and the ratio of catalyzer.Said water cut is meant that the volume of water vapor accounts for the percent of air-flow cumulative volume.Residing environment during for the work of catalysts truly; Can simulate the working condition of various complicacies, for example, in the process of said gas shock; Can make the water cut of air-flow and the air speed of air-flow is steady state value; Temperature through the control air-flow changes between 100-1000 ℃, and the impact of simulation different temperature air-flow, thereby the cohesive strength that loads on the active component coating on the carrier in the catalyzer is measured; The mode that said temperature changes between 100-1000 ℃ can be simulated the temperature variation of various catalyzer working environments, and for example the curve of temperature variation can be as shown in Figure 2; Also can be in the process of said gas shock; The air speed that can make the air temperature and current of air-flow is a steady state value; Water cut through the control air-flow changes between 1-90 volume %; And the impact of the different air-flow of simulation water cut; Thereby the cohesive strength to loading on the active component coating on the carrier in the catalyzer is measured, and the mode that the water cut of said air-flow changes between 1-90 volume % can be simulated the change of moisture content of various catalyzer working environments, and for example the curve of change of moisture content can be as shown in Figure 3; Also with in the process of said gas shock, the water cut that can make the air temperature and current of air-flow is a steady state value, through control air-flow air speed at 1000-100000h
-1Between change, and the impact of the different air-flow of simulation air speed, thus the cohesive strength that loads on the active component coating on the carrier in the catalyzer is measured, the air speed of said air-flow is at 1000-100000h
-1Between the mode that the changes air speed that can simulate various catalyzer working environments change, for example the curve that changes of air speed can be as shown in Figure 4.
Said catalyzer can use commercially available various catalyzer, also can use method well known in the art to prepare, and is preferably cleaning catalyst for tail gases of automobiles.Wherein, method provided by the invention also comprise catalyzer carried out carrying out gas shock before the gas shock with to catalyzer after, respectively catalyzer is weighed, obtain the catalyst weight W before the gas shock respectively
1With the catalyst weight W after the gas shock
2, said dressing drop ratio is (W
1-W
2)/W
3, wherein, W
1Be the catalyst weight before the gas shock, W
2Be the catalyst weight after the gas shock, W
3Weight for active component coating before the gas shock.Under the preferable case, before the catalyzer after the gas shock is weighed, the catalyzer after the gas shock being placed under 100-150 ℃ the temperature and carry out drying, is constant weight until the weight of catalyzer.
Cohesive strength size for active component coating in the more multiple catalyzer; Can be through under identical condition; Multiple catalyzer is carried out gas shock; Measure the dressing drop ratio of active component coating described in every kind of catalyzer respectively, according to the dressing drop ratio of active component coating described in every kind of catalyzer, according to W1-W
2/ W
3The size of value judge the cohesive strength of active component coating in the multiple catalyzer.
The equipment of said gas shock can be the various equipment that can simulate the working environment of catalyzer truly; For example; The equipment that is used for catalyzer is carried out gas shock provided by the invention; This equipment comprises: reactor 1, heating arrangement 2, attemperating unit 3 gentle stream generating apparatus, and said air-flow generating apparatus is used for generating air-flow at reactor 1, and the air-flow that attemperating unit (3) is used for controlling 2 pairs of reactors 1 of heating arrangement heats.
Said air-flow generating apparatus can be the various devices that can simulate the air-flow in catalyzer when work truly, and for example, said air-flow generating apparatus can comprise blower fan 4 and gasified liquid generating apparatus, and said blower fan (4) is communicated with reactor (1).
Said gasified liquid generating apparatus can be the various equipment that can simulate the gasified liquid that exists when catalyzer is worked truly; For example; Said gasified liquid generating apparatus can comprise: fluid reservoir 5, volume control device 6, liquid transmission pipeline 7 and gasification installation 8, and wherein, fluid reservoir 5 is communicated with volume control device 6; Liquid transmission pipeline 7 is used for the liquid of fluid reservoir is transported in the reactor 1, and gasification installation 8 is used for said liquid is changed into gaseous state.
Said gasification installation 8 can be the various devices that can liquid liquid be changed into gasified liquid; For example; Said gasification installation 8 can be broken ceramics; Liquid in the fluid reservoir 5 is got to the liquid in the fluid reservoir 5 on the broken ceramics that is arranged in reactor 1 through liquid transmission pipeline 7 with certain pressure, make liquid transform into vaporized state through the bump and the heating of heating arrangement 2.
Said stationary installation 9 can be fixed on the device in the reactor 1 with catalyzer for various, for example, can be liner.
The various liquid that environment of living in contained when the liquid in the said fluid reservoir 5 can be worked for catalyzer, for example, water.The kind of said heating arrangement is conventionally known to one of skill in the art; Can be the various devices that can be used in heating; The kind of said attemperating unit is conventionally known to one of skill in the art; Can be the various devices that can be used in the control heating-up temperature, the kind of said volume control device is conventionally known to one of skill in the art, can be the various devices that the flow of liquid is controlled that can be used in.
According to the present invention, when catalyzer is carried out gas shock, can catalyzer 10 be placed reactor 1 and be fixed on reactor 1 through stationary installation 9, reactor 1 is communicated with blower fan 4, and regulates the air speed of air-flow through blower fan 4; Fluid reservoir 5 is communicated with volume control device 6, and through liquid transmission pipeline 7 liquid in the fluid reservoir is transported in the reactor 1, and changes into gaseous state through gasification installation 8; Heating arrangement 2 be positioned at reactor 1 around, and the temperature of regulating air-flow through attemperating unit 3.
Through embodiment the present invention is explained in further detail below.
Embodiment 1
Carrier: cordierite honeycomb ceramic, specification do, Φ 101.6mm * 123.3mm, volume are 1L, and weight is 480 grams.
(1) preparation auxiliary agent: preparation 40 grams, concentration are 50 weight % cerous nitrates, lanthanum nitrate, ferric nitrate, nickel nitrate, barium nitrate mixed solution, and the weight ratio of metal does in the various salt, (lanthanum+cerium): (iron+nickel): barium=1: 0.6: 0.13; In this mixed solution, add the citric acid of 10 grams, be heated to 60 ℃, stir as complexing agent; At room temperature placed 15 hours; Resulting product at 80 ℃ of following drying and dehydratings, is ground, obtain auxiliary agent.
(2) with 300 gram γ-Al
2O
3Mix with the auxiliary agent of 20 gram gained, add 820 milliliters of deionized waters, ball milling obtained the coating paste that solid content is 45 weight % in 4 hours;
(3) cordierite honeycomb ceramic carrier impregnated in the resulting coating paste 15 minutes, takes out then, blow the through hole road with pressurized air, put into drying box 80 ℃ dry 4 hours down, 600 ℃ of following roastings are 4 hours in muffle furnace, the carrier that obtains having coating;
(4) be to take out in 5 minutes in the mixed solution of radium chloride and palladium bichloride of 2 weight % to concentration with resulting carrier impregnation with coating; Wherein the weight ratio of Rh and Pd is 1: 6; Put into then drying box 80 ℃ dry 3 hours down, 600 ℃ of following roastings are 4 hours in muffle furnace, obtaining weight is the catalyst A 1 of 580 grams; Wherein, the general assembly (TW) (W of active component coating
3) be 100 grams, the amount of active component rhodium and palladium is 5 grams.
Carrier: cordierite honeycomb ceramic, specification do, Φ 101.6mm * 123.3mm, volume are 1L, and weight is 480 grams.
(1) preparation auxiliary agent: preparation 40 grams, concentration are 50 weight % cerous nitrates, lanthanum nitrate, ferric nitrate, nickel nitrate, barium nitrate mixed solution, and the weight ratio of metal does in the various salt, (lanthanum+cerium): (iron+nickel): barium=1: 0.6: 0.13; In this mixed solution, add the citric acid of 10 grams, be heated to 60 ℃, stir as complexing agent; At room temperature placed 15 hours; Resulting product at 80 ℃ of following drying and dehydratings, is ground, obtain auxiliary agent.
(2) with 300 gram γ-Al
2O
3Mix with the auxiliary agent of 20 gram gained, add 820 milliliters of deionized waters, ball milling obtained the coating paste that solid content is 45 weight % in 4 hours;
(3) cordierite honeycomb ceramic carrier impregnated in the resulting coating paste 5 minutes, takes out then, blow the through hole road with pressurized air, put into drying box 60 ℃ dry 6 hours down, 900 ℃ of following roastings are 1 hour in muffle furnace, the carrier that obtains having coating;
(4) be to take out in 5 minutes in the mixed solution of radium chloride and palladium bichloride of 2 weight % to concentration with resulting carrier impregnation with coating; Wherein the weight ratio of Rh and Pd is 1: 6; Put into then drying box 80 ℃ dry 3 hours down, 600 ℃ of following roastings are 4 hours in muffle furnace, obtaining weight is the catalyst A 2 of 580 grams; Wherein, the general assembly (TW) (W of active component coating
3) be 100 grams, the amount of active component rhodium and palladium is 5 grams.
Carrier: cordierite honeycomb ceramic, specification do, Φ 101.6mm * 123.3mm, volume are 1L, and weight is 480 grams.
(1) preparation auxiliary agent: preparation 40 grams, concentration are 50 weight % cerous nitrates, lanthanum nitrate, ferric nitrate, nickel nitrate, barium nitrate mixed solution, and the weight ratio of metal does in the various salt, (lanthanum+cerium): (iron+nickel): barium=1: 0.6: 0.13; In this mixed solution, add the citric acid of 10 grams, be heated to 60 ℃, stir as complexing agent; At room temperature placed 15 hours; Resulting product at 80 ℃ of following drying and dehydratings, is ground, obtain auxiliary agent.
(2) with 300 gram γ-Al
2O
3Mix with the auxiliary agent of 20 gram gained, add 820 milliliters of deionized waters, ball milling obtained the coating paste that solid content is 45 weight % in 4 hours;
(3) cordierite honeycomb ceramic carrier impregnated in the resulting coating paste 20 minutes; Take out then, blow the through hole road with pressurized air, it is following dry 2 hours at 100 ℃ to put into drying box; 500 ℃ of following roastings are 4 hours in muffle furnace, the carrier that obtains having coating;
(4) be to take out in 5 minutes in the mixed solution of radium chloride and palladium bichloride of 2 weight % to concentration with resulting carrier impregnation with coating; Wherein the weight ratio of Rh and Pd is 1: 6; Put into then drying box 80 ℃ dry 3 hours down, 600 ℃ of following roastings are 4 hours in muffle furnace, obtaining weight is the catalyst A 3 of 580 grams; Wherein, the general assembly (TW) (W of active component coating
3) be 100 grams, the amount of active component rhodium and palladium is 5 grams.
Carrier: cordierite honeycomb ceramic, specification do, Φ 101.6mm * 123.3mm, volume are 1L, and weight is 480 grams.
(1) preparation auxiliary agent: preparation 40 grams, concentration are 50 weight % cerous nitrates, lanthanum nitrate, ferric nitrate, nickel nitrate, barium nitrate mixed solution, and the weight ratio of metal does in the various salt, (lanthanum+cerium): (iron+nickel): barium=1: 0.6: 0.13; In this mixed solution, add the citric acid of 10 grams, be heated to 60 ℃, stir as complexing agent; At room temperature placed 15 hours; Resulting product at 80 ℃ of following drying and dehydratings, is ground, obtain auxiliary agent.
(2) with 300 gram γ-Al
2O
3Mix with the auxiliary agent of 20 gram gained, add 820 milliliters of deionized waters, ball milling obtained the coating paste that solid content is 45 weight % in 4 hours;
(3) cordierite honeycomb ceramic carrier impregnated in the resulting coating paste 10 minutes; Take out then, blow the through hole road with pressurized air, it is following dry 10 hours at 50 ℃ to put into drying box; 750 ℃ of following roastings are 5 hours in muffle furnace, the carrier that obtains having coating;
(4) be to take out in 5 minutes in the mixed solution of radium chloride and palladium bichloride of 2 weight % to concentration with resulting carrier impregnation with coating; Wherein the weight ratio of Rh and Pd is 1: 6; Put into then drying box 80 ℃ dry 3 hours down, 600 ℃ of following roastings are 4 hours in muffle furnace, obtaining weight is the catalyst A 4 of 580 grams; Wherein, the general assembly (TW) (W of active component coating
3) be 100 grams, the amount of active component rhodium and palladium is 5 grams.
Embodiment 5-8
Weigh obtains W to the catalyst A 1-A4 that respectively embodiment 1-4 is prepared through electronic balance (Sartorius, BS 124S)
1And placing device shown in Figure 1 to carry out gas shock, the condition of said gas shock comprises: the water cut of air-flow is 10 volume %, and the air speed of air-flow is 40000h
-1, the temperature of air-flow is 800 ℃, the time of impact is 40 hours.After gas shock finishes, under 120 ℃, catalyzer being carried out drying, is constant weight until the weight of catalyzer, and catalyzer is weighed obtains W afterwards
2Calculate the dressing drop ratio W of catalyzer
Dressing drop ratio=(W
1-W
2)/W
3The result is as shown in table 1.
Embodiment 9-12
Weigh obtains W to the catalyst A 1-A4 that respectively embodiment 1-4 is prepared through electronic balance (Sartorius, BS 124S)
1And placing device shown in Figure 1 to carry out gas shock, the condition of said gas shock comprises: the water cut of air-flow is 10 volume %, and the air speed of air-flow is 40000h
-1, the initial temperature of air-flow is 100 ℃; The temperature of air-flow is brought up to 800 ℃ in 1 hour afterwards; In 1 hour, make the temperature of air-flow be reduced to 150 ℃ afterwards; In 1 hour, make the temperature of air-flow bring up to 800 ℃ afterwards, in 1 hour, make the temperature of air-flow be reduced to 150 ℃ afterwards, repeat said temperature and change,, finish to impact until full 40 hours.After gas shock finishes, under 120 ℃, catalyzer being carried out drying, is constant weight until the weight of catalyzer, and catalyzer is weighed obtains W afterwards
2Calculate the dressing drop ratio W of catalyzer
Dressing drop ratio=(W
1-W
2)/W
3The result is as shown in table 2.
Embodiment 13-16
Weigh obtains W to the catalyst A 1-A4 that respectively embodiment 1-4 is prepared through electronic balance (Sartorius, BS 124S)
1And place device shown in Figure 1 to carry out gas shock, and the condition of said gas shock comprises: the temperature of air-flow is 800 ℃, the air speed of air-flow is 40000h
-1, the initial moisture content of air-flow is 10 volume %; In 1 hour, make the water cut of air-flow bring up to 30 volume % afterwards; In 1 hour, make the water cut of air-flow be reduced to 10 volume % afterwards; In 1 hour, make the water cut of air-flow bring up to 30 volume % afterwards, in 1 hour, make the water cut of air-flow be reduced to 10 volume % afterwards, repeat above-mentioned change of moisture content,, finish to impact until full 40 hours.After gas shock finishes, under 120 ℃, catalyzer being carried out drying, is constant weight until the weight of catalyzer, and catalyzer is weighed obtains W afterwards
2Calculate the dressing drop ratio W of catalyzer
Dressing drop ratio=(W
1-W
2)/W
3The result is as shown in table 3.
Embodiment 17-20
Weigh obtains W to the catalyst A 1-A4 that respectively embodiment 1-4 is prepared through electronic balance (Sartorius, BS 124S)
1And place device shown in Figure 1 to carry out gas shock, and the condition of said gas shock comprises: the temperature of air-flow is 800 ℃, and the water cut of air-flow is 10 volume %, and the initial air speed of air-flow is 10000h
-1In 1 hour, make the air speed of air-flow bring up to 80000h afterwards
-1In 1 hour, make the air speed of air-flow be reduced to 10000h afterwards
-1In 1 hour, make the air speed of air-flow bring up to 80000h afterwards
-1, in 1 hour, make the air speed of air-flow be reduced to 10000h afterwards
-1, repeat above-mentioned air speed and change, until full 40 hours, finish to impact.After gas shock finishes, under 120 ℃, catalyzer being carried out drying, is constant weight until the weight of catalyzer, and catalyzer is weighed obtains W afterwards
2Calculate the dressing drop ratio W of catalyzer
Dressing drop ratio=(W
1-W
2)/W
3The result is as shown in table 4.
Embodiment 21-24
The light off characteristics of catalyzer is to weigh the good and bad important symbol of catalyst performance, and initiation temperature is low more, explains that the performance of this catalyzer is good more.Particularly when engine was in cold start-up, the temperature of this moment was lower, and discharge tail gas is more, has only the initiation temperature of catalyzer lower, could effectively tail gas be transformed.And initiation temperature T
50Be meant that catalyzer reaches 50% o'clock pairing catalytic converter gasinlet temperature to the catalytic conversion efficiency of a certain pollutant.
(1) respectively the catalyzer of embodiment 1-4 is put into quartz tube reactor; The tail gas of simulation is passed through quartz ampoule; Through each tail gas concentration of component of each catalyst support, the conversion ratio of CO, HC, NO when calculating different temperatures is with the function construction of purifying rate as catalyst inlet gas temperature when writing down different temperatures simultaneously; Temperature when trying to achieve purifying rate 50%, i.e. initiation temperature T
50
Consisting of of laboratory simulation tail gas: CO 1.5%, C
3H
80.103%, NO 0.098%, CO
210.0%, O
21.25%, N
2Be balance gas.
Test condition comprises: air speed is 6 * 10
4h
-1, probe temperature is spaced apart 20 ℃.
(2) respectively the catalyzer of embodiment 1-4 is carried out gas shock with same simulated exhaust gas, the condition of gas shock comprises: the air speed of air-flow is 40000h
-1, air-flow temperature be 800 ℃, the water cut of air-flow is 10 volume %, the time of gas shock is 40 hours.
(3) through after the gas shock of method detection through step (2) identical with step (1), the initiation temperature T of catalyzer
50, and through calculating the added value of initiation temperature, the result lists in table 1.
Embodiment 25-28
Respectively the performance of the catalyzer of embodiment 1-4 is detected through the method identical with embodiment 21-24; Difference is that the gas shock in the step (2) carries out according to following steps and condition: the condition of gas shock comprises: the water cut of air-flow is 10 volume %, and the air speed of air-flow is 40000h
-1, the initial temperature of air-flow is 100 ℃; The temperature of air-flow is brought up to 800 ℃ in 1 hour afterwards; In 1 hour, make the temperature of air-flow be reduced to 150 ℃ afterwards; In 1 hour, make the temperature of air-flow bring up to 800 ℃ afterwards, in 1 hour, make the temperature of air-flow be reduced to 150 ℃ afterwards, repeat said temperature and change,, finish to impact until full 40 hours.The added value of initiation temperature is listed in table 2.
Embodiment 29-32
Respectively the performance of the catalyzer of embodiment 1-4 is detected through the method identical with embodiment 21-24; Difference is that the gas shock in the step (2) carries out according to following steps and condition: the condition of gas shock comprises: the temperature of air-flow is 800 ℃, and the air speed of air-flow is 40000h
-1, the initial moisture content of air-flow is 10 volume %; In 1 hour, make the water cut of air-flow bring up to 30 volume % afterwards; In 1 hour, make the water cut of air-flow be reduced to 10 volume % afterwards; In 1 hour, make the water cut of air-flow bring up to 30 volume % afterwards, in 1 hour, make the water cut of air-flow be reduced to 10 volume % afterwards, repeat above-mentioned change of moisture content,, finish to impact until full 40 hours.After gas shock finishes.The added value of initiation temperature is listed in table 3.
Embodiment 33-36
Respectively the performance of the catalyzer of embodiment 1-4 is detected through the method identical with embodiment 21-24; Difference is that the gas shock in the step (2) carries out according to following steps and condition: the condition of gas shock comprises: the temperature of air-flow is 800 ℃; The water cut of air-flow is 10 volume %, and the initial air speed of air-flow is 10000h
-1In 1 hour, make the air speed of air-flow bring up to 80000h afterwards
-1In 1 hour, make the air speed of air-flow be reduced to 10000h afterwards
-1In 1 hour, make the air speed of air-flow bring up to 80000h afterwards
-1, in 1 hour, make the air speed of air-flow be reduced to 10000h afterwards
-1, repeat above-mentioned air speed and change, until full 40 hours, finish to impact.The added value of initiation temperature is listed in table 4.
Table 1
Table 2
Table 3
Table 4
Can find out that according to table 1,2, the test result shown in 3 and 4 variation tendency and the catalyzer that load on the cohesive strength result who loads on the active component coating on the carrier that the method for the cohesive strength of the active component coating on the carrier records in the mensuration catalyzer that adopts invention to provide are to HC, CO and NO
xGas T
50The variation tendency of added value consistent; This shows; The method accuracy of the cohesive strength of active component coating is high in the detection catalyzer provided by the invention, and from testing process, and this method is the cohesive strength of reactive components coating under in working order truly.
Claims (7)
1. method of measuring the cohesive strength of active component coating in the catalyzer; It is characterized in that this method comprises carries out gas shock to catalyzer, and measure the dressing drop ratio of active component coating described in the catalyzer; The cohesive strength of representing active component coating according to the dressing drop ratio of said active component coating; Wherein, the condition of said gas shock comprises: the water cut of air-flow is 1-90 volume %, and the air speed of air-flow is 1000-100000h
-1, the temperature of air-flow is 100-1000 ℃, the time of impact is 1-1000 hour; This method is carried out in following equipment; This equipment comprises: reactor (1), heating arrangement (2), the gentle stream generating apparatus of attemperating unit (3), said air-flow generating apparatus are used for generating air-flow at reactor (1), and attemperating unit (3) is used for controlling heating arrangement (2) air-flow of reactor (1) is heated; Wherein, Said air-flow generating apparatus comprises blower fan (4) and gasified liquid generating apparatus, and said blower fan (4) is communicated with reactor (1), and said gasified liquid generating apparatus comprises: fluid reservoir (5), volume control device (6), liquid transmission pipeline (7) and gasification installation (8); Wherein, Fluid reservoir (5) is communicated with volume control device (6), and liquid transmission pipeline (7) is used for the liquid of fluid reservoir is transported in the reactor (1), and gasification installation (8) is used for said liquid is changed into gaseous state.
2. method according to claim 1, wherein, in the process of said gas shock, the water cut of air-flow and the air speed of air-flow are steady state value, and the temperature of air-flow changes between 100-1000 ℃.
3. method according to claim 1, wherein, in the process of said gas shock, the air speed of the air temperature and current of air-flow is a steady state value, and the water cut of air-flow changes between 1-90 volume %.
4. method according to claim 1, wherein, in the process of said gas shock, the water cut of the air temperature and current of air-flow is a steady state value, and the air speed of air-flow is at 1000-100000h
-1Between change.
5. method according to claim 1, wherein, said dressing drop ratio is (W
1-W
2)/W
3, wherein, W
1Be the catalyst weight before the gas shock, W
2Be the catalyst weight after the gas shock, W
3Weight for active component coating before the gas shock.
6. method according to claim 1, wherein, said catalyzer is a cleaning catalyst for tail gases of automobiles.
7. an equipment that is used for the described method of claim 1 is characterized in that, this equipment comprises: reactor (1), heating arrangement (2), the gentle stream generating apparatus of attemperating unit (3); Said air-flow generating apparatus is used for generating air-flow at reactor (1); Attemperating unit (3) is used for controlling heating arrangement (2) air-flow of reactor (1) is heated, and wherein, said air-flow generating apparatus comprises blower fan (4) and gasified liquid generating apparatus; Said blower fan (4) is communicated with reactor (1); Said gasified liquid generating apparatus comprises: fluid reservoir (5), volume control device (6), liquid transmission pipeline (7) and gasification installation (8), and wherein, fluid reservoir (5) is communicated with volume control device (6); Liquid transmission pipeline (7) is used for the liquid of fluid reservoir is transported in the reactor (1), and gasification installation (8) is used for said liquid is changed into gaseous state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101440893A CN101644655B (en) | 2008-08-06 | 2008-08-06 | Method and equipment for measuring bonding strength of active component coating in catalyst |
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|---|---|---|---|
| CN2008101440893A CN101644655B (en) | 2008-08-06 | 2008-08-06 | Method and equipment for measuring bonding strength of active component coating in catalyst |
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