CN104122337B - Multi-station serial linkage nitrogen adsorption specific surface instrument and specific surface measurement method - Google Patents
Multi-station serial linkage nitrogen adsorption specific surface instrument and specific surface measurement method Download PDFInfo
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- CN104122337B CN104122337B CN201410320453.2A CN201410320453A CN104122337B CN 104122337 B CN104122337 B CN 104122337B CN 201410320453 A CN201410320453 A CN 201410320453A CN 104122337 B CN104122337 B CN 104122337B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 233
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 118
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004441 surface measurement Methods 0.000 title claims description 6
- 238000003795 desorption Methods 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 34
- 230000003028 elevating effect Effects 0.000 claims description 13
- 230000007423 decrease Effects 0.000 claims description 9
- 239000001307 helium Substances 0.000 claims description 6
- 229910052734 helium Inorganic materials 0.000 claims description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 6
- 150000002829 nitrogen Chemical class 0.000 claims description 3
- 230000005477 standard model Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UDWPONKAYSRBTJ-UHFFFAOYSA-N [He].[N] Chemical compound [He].[N] UDWPONKAYSRBTJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
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Abstract
The invention relates to a multi-station serial linkage nitrogen adsorption specific surface instrument and a specific surface measuring method, comprising a plurality of four-way electromagnetic valves, a plurality of U-shaped sample tubes, a plurality of liquid nitrogen cups, a thermal conductivity cell and a quantitative nitrogen pipeline; each four-way electromagnetic valve is respectively connected with a sample tube and a liquid nitrogen cup to form an adsorption unit, and a third connecting port and a fourth connecting port of each four-way electromagnetic valve are respectively connected with two connecting ends of the sample tube; the adsorption units are connected in series, a first connecting port of the four-way electromagnetic valve in the adsorption unit at the head end is communicated with a reference wall port of the thermal conductivity tank, a second connecting port of the four-way electromagnetic valve in the adsorption unit at the tail end is communicated with a measuring arm port of the thermal conductivity tank through a quantitative nitrogen pipeline, and a second connecting port of the four-way electromagnetic valve close to the head end in every two adjacent adsorption units is communicated with a first connecting port of the four-way electromagnetic valve close to the tail end. The invention greatly improves the shapes of absorption and desorption peaks when measuring the small specific surface, improves the testing precision and shortens the testing time.
Description
Technical field
The present invention relates to dynamic N2 adsorption technical field, particularly a kind of multistation is connected the method that dynamic N2 adsorption specific surface instrument and specific surface are measured.
Background technology
At present, all dynamic Multi-example n2 absorption apparatus all adopt cross gas circuit, namely have the mixed gas of certain nitrogen partial pressure, be divided into four tunnels, flow through four sample hoses in parallel, and then and Hui Yilu, enter conductance cell, during test, four sample hoses immerse liquid nitrogen cup simultaneously, adsorb simultaneously, then get back to room temperature from liquid nitrogen temperature one by one, out, this method adopts the present to desorption one by one always.This method also exists a perplexing problem, be exactly when measuring small specific surface, its desorption peaks is not only wide but also short, the integral error of peak area is very large, cause the measuring accuracy of specific surface very poor, usual way helps to accelerate desorption with hot water or hot blast, but limited efficiency, and make test process become complicated, be also unfavorable for automatic control.Research finds, generation and the sample hose parallel way of above phenomenon have direct relation because when adsorbance is very little, three road air-flows of the non-desorption that the limited nitrogen that sample hose desorption goes out by parallel connection water down, greatly reduce the precision of test.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind ofly can improve measuring accuracy when measuring small specific surface, shorten the multistation of adsorption and desorption time connects the method that dynamic N2 adsorption specific surface instrument and specific surface measure.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of multistation is connected dynamic N2 adsorption specific surface instrument, comprises multiple four way solenoid valve, the sample hose of multiple U-shaped, multiple liquid nitrogen cup, conductance cell and quantitative nitrogen pipeline;
Each four way solenoid valve forms an absorbing unit with a sample hose and liquid nitrogen cup respectively, and the 3rd connector of four way solenoid valve is connected with two links of sample hose respectively with the 4th connector, and the bottom horizontal edge of sample hose is dipped in described liquid nitrogen cup;
Be connected in series between multiple absorbing unit, the reference wall mouth of the first connector and conductance cell that are arranged in the four way solenoid valve of the absorbing unit of head end is communicated with, the second connector being arranged in the four way solenoid valve of the absorbing unit of tail end is communicated with the gage beam mouth of conductance cell through quantitative nitrogen pipeline, and the second connector of the four way solenoid valve of the close head end in every two the adjacent absorbing units between head end and tail end is communicated with the first connector of the four way solenoid valve near tail end;
When four way solenoid valve power-off, the first connector of each four way solenoid valve is communicated with the second connector, and the 3rd connector is communicated with the 4th connector, each sample hose seal itself; When four way solenoid valve is energized, first connector of each four way solenoid valve is communicated with the 4th connector, and the 3rd connector is communicated with the second connector, makes liquid nitrogen cup increase or decline by elevating mechanism, carry out gas absorption or desorption, the gas after adsorption and desorption enters conductance cell.
The invention has the beneficial effects as follows: in the present invention, the desorption of each sample does not all affect by any of other samples, desorption rate is little more also can not be watered down, see intuitively, the result done like this makes signal than increasing 4 times time in parallel, and find, the fabric width at peak also reduces many, that is, while desorption peaks becomes and sharply makes measuring accuracy significantly improve, desorption time also shortens, fundamentally improve the shape of the desorption peaks of traditional dynamic instrument, thoroughly solve drawback when measuring small specific surface, and substantially increase the testing efficiency of dynamic instrument.
On the basis of technique scheme, the present invention can also do following improvement:
Further, described quantitative nitrogen pipeline is the gas circuit that two four way valve is combined to form.
Further, described pair of four way valve comprises the first four way valve and the second four way valve, second connector of the first four way valve is connected with the first connector of the second four way valve, first connector of the first four way valve is used for from outside access nitrogen, 4th connector of the first four way valve is used for externally emission gases, second connector of the second four way valve is connected with the 3rd connector of the first four way valve, 3rd connector of the second four way valve and the 4th connector of the second four way valve are serially connected with to be tested in gas circuit, and is communicated with conductance cell;
When two four way valve power-off, outside nitrogen flows into air through the 4th connector of the first connector of the second connector of the first connector of the first four way valve, the first four way valve, the second four way valve, the second connector of the second four way valve, the 3rd connector of the first four way valve and the first four way valve, and the connecting line wherein between the second connector of the second four way valve and the 3rd connector of the first four way valve forms quantitative nitrogen pipeline;
When the energising of two four way valve, the 4th connector being arranged in three connector of gas via the second four way valve of the absorbing unit of tail end, the second connector of the second four way valve, the 3rd connector of the first four way valve, the second connector of the first four way valve, the first link of the second four way valve and the second four way valve flows into conductance cell.
Further, a kind of method utilizing multistation series connection N2 adsorption specific surface instrument to carry out specific surface measurement, comprises the following steps:
Step 1: by the four way solenoid valve energising in each absorbing unit, mixed gas is flowed through each absorbing unit one by one after the reference wall of conductance cell;
Step 2: make liquid nitrogen cup increase by elevating mechanism, the absorption nitrogen at the temperature of liquid nitrogen of the sample now in each sample hose, after the gage beam of conductance cell, obtains the adsorption peak of a superposition, after absorption reaches capacity, by each four way solenoid valve power-off;
Step 3: declined by elevating mechanism and be arranged in the liquid nitrogen cup of the first absorbing unit, and while decline liquid nitrogen cup, by the four way solenoid valve energising in this absorbing unit, obtain the desorption peaks of sample in this sample hose, after desorption completes, by four way solenoid valve power-off, now, other sample hoses are in self-enclosed state;
Step 4: the liquid nitrogen cup declined successively from head to tail each absorbing unit, repeat step 3, until in each sample hose successively desorption complete, obtain the desorption peaks of sample in each sample hose;
Step 5: according to the desorption peaks of sample in each sample hose, calculates the specific surface value of sample in each sample hose.
Further, a kind of method utilizing multistation series connection N2 adsorption specific surface instrument to carry out the measurement of BET specific surface, comprises the following steps:
Step 1: the ratio of selected helium and nitrogen, using this ratio as the first nitrogen partial pressure;
Step 2: by the four way solenoid valve energising in each absorbing unit, the mixed gas of the first nitrogen partial pressure is passed into after the reference wall of conductance cell and is arranged in the first absorbing unit;
Step 3: make liquid nitrogen cup increase by elevating mechanism, makes each sample hose absorption nitrogen at the temperature of liquid nitrogen, obtains the adsorption peak of a superposition, after absorption reaches capacity, by each four way solenoid valve power-off;
Step 4: declined by elevating mechanism and be arranged in the liquid nitrogen cup of the first absorbing unit, and while decline liquid nitrogen cup, by the four way solenoid valve energising in this absorbing unit, obtain the desorption peaks of sample in this sample hose, after desorption completes, by four way solenoid valve power-off;
Step 5: the liquid nitrogen cup declined successively from head to tail each absorbing unit, repeat step 4, until in each sample hose successively desorption complete, obtain the desorption peaks of sample in each sample hose;
Step 6: according to the desorption peaks of sample in each sample hose, calculates the nitrogen adsorption amount of sample under this nitrogen partial pressure in each sample hose;
Step 7: select the nitrogen partial pressure in several BET specific surface test specifications, and repeat step 2 to step 5, the desorption peaks of sample in each sample hose under recording each nitrogen partial pressure, and then calculate the multiple spot BET specific surface value of each sample.
Accompanying drawing explanation
Fig. 1 is one-piece construction figure of the present invention;
Fig. 2 is four way solenoid valve gas circuit connected graph of the present invention;
Fig. 3 is the two four way valve gas circuit connected graph of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, four way solenoid valve, 2, sample hose, 3, liquid nitrogen cup, 4, conductance cell, 5, quantitatively nitrogen pipeline, 6, absorbing unit, the 7, first four way valve, the 8, second four way valve.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, be one-piece construction figure of the present invention; Fig. 2 is four way solenoid valve gas circuit connected graph of the present invention; Fig. 3 is the two four way valve gas circuit connected graph of the present invention.
Embodiment 1
A kind of multistation is connected dynamic N2 adsorption specific surface instrument, comprises multiple four way solenoid valve 1, the sample hose 2 of multiple U-shaped, multiple liquid nitrogen cup 3, conductance cell 4 and quantitative nitrogen pipeline 5;
Each four way solenoid valve 1 forms an absorbing unit 6 with a sample hose 2 and liquid nitrogen cup 3 respectively, 3rd connector of four way solenoid valve 1 is connected with two links of sample hose 2 respectively with the 4th connector, and the bottom horizontal edge of sample hose 2 is dipped in described liquid nitrogen cup 3;
Be connected in series between multiple absorbing unit 6, the reference wall mouth of the first connector and conductance cell 4 that are arranged in the four way solenoid valve 1 of the absorbing unit 6 of head end is communicated with, the second connector being arranged in the four way solenoid valve 1 of the absorbing unit 6 of tail end is communicated with the gage beam mouth of conductance cell 4 through quantitative nitrogen pipeline 5, and the second connector of the four way solenoid valve 1 of the close head end in every two the adjacent absorbing units 6 between head end and tail end is communicated with the first connector of the four way solenoid valve 1 near tail end;
When four way solenoid valve 1 power-off, the first connector of each four way solenoid valve 1 is communicated with the second connector, and the 3rd connector is communicated with the 4th connector, each sample hose 2 seal itself; When four way solenoid valve 1 is energized, first connector of each four way solenoid valve 1 is communicated with the 4th connector, and the 3rd connector is communicated with the second connector, makes liquid nitrogen cup 3 rise or decline by elevating mechanism, carry out gas absorption or desorption, the gas after adsorption and desorption enters conductance cell 4.
This multistation dynamic N2 adsorption specific surface instrument of connecting can carry out specific surface measurement with directly comparing method, its testing process is: first all opened by each solenoid valve, each sample hose is all connected on to be measured in gas circuit, pass in pipeline and determine that the helium-nitrogen of ratio mixes gas, such as 80% helium adds 20% nitrogen (P/Po=0.2), places corresponding liquid nitrogen cup under each sample hose; Second step, allows each liquid nitrogen cup rise simultaneously, the absorption nitrogen while that at this moment each sample being under liquid nitrogen temperature, obtains the adsorption peak of a superposition, after absorption reaches capacity, closes all valves; 3rd step, the liquid nitrogen cup declined on first sample hose (standard model) in order, opens the solenoid valve of counter sample pipe simultaneously, leave the sample of liquid nitrogen cup independent carry out desorption, obtain the desorption peaks of this sample, after desorption completes, close its solenoid valve immediately; 4th step, the same manner carry out next sample desorption test, repeat third step, until all samples successively desorption complete, obtain the desorption peaks of all samples.In this metering system, in first sample hose, load the standard model of certain known specific surface, the size due to specific surface is proportional to the area of desorption peaks, therefore contrast by the desorption peaks of other samples and the desorption peaks of standard model, just can obtain the specific surface value of each sample.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1: adding quantitative nitrogen pipeline 5 is the gas circuit that two four way valve is combined to form.
Described pair of four way valve comprises the first four way valve 7 and the second four way valve 8, second connector of the first four way valve 7 is connected with the first connector of the second four way valve 8, first connector of the first four way valve 7 is used for from outside access nitrogen, 4th connector of the first four way valve 7 is used for externally emission gases, second connector of the second four way valve 8 is connected with the 3rd connector of the first four way valve 7,3rd connector of the second four way valve 8 and the 4th connector of the second four way valve 8 are serially connected with to be tested in gas circuit, and is communicated with conductance cell;
When two four way valve power-off, outside nitrogen flows into air through the 4th connector of the first connector of the second connector of the first connector of the first four way valve 7, the first four way valve 7, the second four way valve 8, the second connector of the second four way valve 8, the 3rd connector of the first four way valve 7 and the first four way valve 7, and the connecting line wherein between the second connector of the second four way valve 8 and the 3rd connector of the first four way valve 7 forms quantitative nitrogen pipeline 5;
When the energising of two four way valve, the 4th connector being arranged in three connector of gas via the second four way valve 8 of the absorbing unit 6 of tail end, the second connector of the second four way valve 8, the 3rd connector of the first four way valve 7, the second connector of the first four way valve 7, the first link of the second four way valve 8 and the second four way valve 8 flows into conductance cell.
This multistation series connection specific surface instrument carries out the method for BET specific surface measurement, comprises the following steps:
Step 1: the ratio of selected helium and nitrogen, using this ratio as the first nitrogen partial pressure;
Four way solenoid valve 1 in each absorbing unit 6 is energized, the mixed gas of the first nitrogen partial pressure is passed into through conductance cell 4 and is arranged in the first absorbing unit 6, and flow through all absorbing units successively;
Step 2: make liquid nitrogen cup 3 increase by elevating mechanism, makes each sample hose 2 absorption nitrogen at the temperature of liquid nitrogen, obtains the adsorption peak of a superposition, after absorption reaches capacity, by the power-off of each four way solenoid valve 1;
Step 3: by two four way valve energisings of quantitative nitrogen pipeline, the nitrogen be full of in quantitative pipeline is switched in test macro, after conductance cell, obtains " desorption peaks " of a quantitative nitrogen, and the area at this peak corresponds to the volume of nitrogen in quantity tube;
Step 4: declined by elevating mechanism and be arranged in the liquid nitrogen cup 3 of the first absorbing unit 6, and while decline liquid nitrogen cup 3, the four way solenoid valve 1 in this absorbing unit 6 is energized, obtain the desorption peaks of sample in this sample hose 2, after desorption completes, by four way solenoid valve 1 power-off;
Step 5: the liquid nitrogen cup 3 declined successively each absorbing unit 6 from head to tail, repeat step 4, until in each sample hose 2 successively desorption complete, obtain the desorption peaks of sample in each sample hose 2;
Step 6: contrast according to the desorption peaks of sample in each sample hose 2 and the desorption peaks of quantitative nitrogen, calculate the nitrogen adsorption amount of sample in each sample hose 2;
Step 7: select the nitrogen partial pressure in several BET specific surface test specifications, and repeat step 2 to step 6, record the determined volume peak under each nitrogen partial pressure, and the desorption peaks of sample in each sample hose 2, obtain the nitrogen adsorption amount of each sample under each nitrogen partial pressure simultaneously, finally carry out the multiple spot BET specific surface value calculating multiple sample.
Multistation dynamic specific surface instrument of connecting is measured for BET specific surface, its testing process is: the ratio of first selected helium and nitrogen, determine suitable nitrogen partial pressure, then the adsorption desorption test of this point of pressure is carried out, program is identical with above-mentioned: the first step, each solenoid valve is all opened, each sample hose is connected on to be measured in gas circuit, the mixed gas determining nitrogen partial pressure is passed in pipeline, such as 90% helium adds 10% nitrogen (P/Po=0.1), places corresponding liquid nitrogen cup under each sample hose; Second step, when allowing each liquid nitrogen cup rise, the absorption nitrogen while that at this moment each sample being under liquid nitrogen temperature, after absorption reaches capacity, closes all valves simultaneously; 3rd step, incision quantitatively calibrating gas, obtains demarcating peak; 4th step, decline the liquid nitrogen cup of sample in order one by one, open the solenoid valve of counter sample pipe simultaneously, what each sample was independent carries out desorption, obtain the desorption peaks of each sample respectively, after each sample desorption completes, close corresponding solenoid valve immediately, the same manner carries out the test of next sample, until the desorption of all samples under this nitrogen partial pressure all completes; 5th step, selects next nitrogen partial pressure, such as P/Po=0.2, repeats the above-mentioned the second to the four step, carries out the suction of above-mentioned each sample, desorption test; According to the test request of BET specific surface, in the scope of nitrogen partial pressure 0.05-0.35, select 3-5 dividing potential drop, the desorption peaks of each sample of such as 0.1,0.15,0.2,0.25,0.3 mensuration each point of pressure, then test data is processed, the multiple spot BET specific surface value of multiple sample can be obtained simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a multistation is connected dynamic N2 adsorption specific surface instrument, it is characterized in that: comprise multiple four way solenoid valve (1), the sample hose (2) of multiple U-shaped, multiple liquid nitrogen cup (3), conductance cell (4) and quantitative nitrogen pipeline (5);
Each four way solenoid valve (1) forms an absorbing unit (6) with a sample hose (2) and liquid nitrogen cup (3) respectively, 3rd connector of four way solenoid valve (1) is connected with two links of sample hose (2) respectively with the 4th connector, and the bottom horizontal edge of sample hose (2) is dipped in described liquid nitrogen cup (3);
Multiple absorbing unit is connected in series between (6), the first connector being arranged in the four way solenoid valve (1) of the absorbing unit (6) of head end is communicated with the reference wall mouth of conductance cell (4), the second connector being arranged in the four way solenoid valve (1) of the absorbing unit (6) of tail end is communicated with through the gage beam mouth of quantitative nitrogen pipeline (5) with conductance cell (4), second connector of the four way solenoid valve (1) of the close head end in every two the adjacent absorbing units (6) between head end and tail end is communicated with the first connector of the four way solenoid valve (1) near tail end,
When four way solenoid valve (1) power-off, the first connector of each four way solenoid valve (1) is communicated with the second connector, and the 3rd connector is communicated with the 4th connector, each sample hose (2) seal itself; When four way solenoid valve (1) is energized, first connector of each four way solenoid valve (1) is communicated with the 4th connector, 3rd connector is communicated with the second connector, make liquid nitrogen cup (3) increase by elevating mechanism or decline, carry out gas absorption or desorption, the gas after adsorption and desorption enters conductance cell (4);
Described quantitative nitrogen pipeline (5) is the gas circuit that two four way valve is combined to form.
2. specific surface instrument according to claim 1, it is characterized in that: described pair of four way valve comprises the first four way valve (7) and the second four way valve (8), second connector of the first four way valve (7) is connected with the first connector of the second four way valve (8), first connector of the first four way valve (7) is used for from outside access nitrogen, 4th connector of the first four way valve (7) is used for externally emission gases, second connector of the second four way valve (8) is connected with the 3rd connector of the first four way valve (7), 3rd connector of the second four way valve (8) and the 4th connector of the second four way valve (8) are serially connected with to be tested in gas circuit, and be communicated with conductance cell,
When two four way valve power-off, outside nitrogen flows into air through the 4th connector of the first connector of the second connector of the first connector of the first four way valve (7), the first four way valve (7), the second four way valve (8), the second connector of the second four way valve (8), the 3rd connector of the first four way valve (7) and the first four way valve (7), and the connecting line wherein between the second connector of the second four way valve (8) and the 3rd connector of the first four way valve (7) forms quantitative nitrogen pipeline (5);
When the energising of two four way valve, the 4th connector being arranged in three connector of gas via the second four way valve (8) of the absorbing unit (6) of tail end, the second connector of the second four way valve (8), the 3rd connector of the first four way valve (7), the second connector of the first four way valve (7), the first link of the second four way valve (8) and the second four way valve (8) flows into conductance cell.
3. utilize multistation dynamic N2 adsorption specific surface instrument of connecting to carry out the method for specific surface measurement, it is characterized in that, comprise the following steps:
Step 1: by the four way solenoid valve energising in each absorbing unit, mixed gas is flowed through each absorbing unit one by one after the reference wall of conductance cell;
Step 2: make liquid nitrogen cup increase by elevating mechanism, the absorption nitrogen at the temperature of liquid nitrogen of the sample now in each sample hose, after the gage beam of conductance cell, obtains the adsorption peak of a superposition, after absorption reaches capacity, by each four way solenoid valve power-off;
Step 3: declined by elevating mechanism and be arranged in the liquid nitrogen cup of the first absorbing unit, and while decline liquid nitrogen cup, by the four way solenoid valve energising in this absorbing unit, obtain the desorption peaks of sample in this sample hose, after desorption completes, by four way solenoid valve power-off, now, other sample hoses are in self-enclosed state;
Step 4: the liquid nitrogen cup declined successively from head to tail each absorbing unit, repeat step 3, until in each sample hose successively desorption complete, obtain the desorption peaks of sample in each sample hose;
Step 5: according to the desorption peaks of sample in each sample hose, calculates the specific surface value of sample in each sample hose.
4. utilize multistation dynamic N2 adsorption specific surface instrument of connecting to carry out the method for BET specific surface measurement, it is characterized in that, comprise the following steps:
Step 1: the ratio of selected helium and nitrogen, using this ratio as the first nitrogen partial pressure;
Step 2: by the four way solenoid valve energising in each absorbing unit, the mixed gas of the first nitrogen partial pressure is passed into after the reference wall of conductance cell and is arranged in the first absorbing unit;
Step 3: make liquid nitrogen cup increase by elevating mechanism, makes each sample hose absorption nitrogen at the temperature of liquid nitrogen, obtains the adsorption peak of a superposition, after absorption reaches capacity, by each four way solenoid valve power-off;
Step 4: declined by elevating mechanism and be arranged in the liquid nitrogen cup of the first absorbing unit, and while decline liquid nitrogen cup, by the four way solenoid valve energising in this absorbing unit, obtain the desorption peaks of sample in this sample hose, after desorption completes, by four way solenoid valve power-off;
Step 5: the liquid nitrogen cup declined successively from head to tail each absorbing unit, repeat step 4, until in each sample hose successively desorption complete, obtain the desorption peaks of sample in each sample hose;
Step 6: according to the desorption peaks of sample in each sample hose, calculates the nitrogen adsorption amount of sample under this nitrogen partial pressure in each sample hose;
Step 7: select the nitrogen partial pressure in 3-5 BET specific surface test specification, and repeat step 2 to step 5, the desorption peaks of sample in each sample hose under recording each nitrogen partial pressure, and then calculate the multiple spot BET specific surface value of each sample.
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