CN104971715A - Preparation method for cellular thin-walled denitration catalyst - Google Patents
Preparation method for cellular thin-walled denitration catalyst Download PDFInfo
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- CN104971715A CN104971715A CN201510385228.1A CN201510385228A CN104971715A CN 104971715 A CN104971715 A CN 104971715A CN 201510385228 A CN201510385228 A CN 201510385228A CN 104971715 A CN104971715 A CN 104971715A
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Abstract
The invention provides a preparation method for a cellular thin-walled denitration catalyst. The preparation method comprises the following steps: (1) mixing of raw materials; (2) extrusion molding: a step of conveying the materials in the mixing roll into an extruder and extruding a cellular blank body; (3) drying: a step of drying the cellular blank body under the conditions of a temperature of 25 to 65 DEG C and relative humidity of 10 to 90% for 8 to 10 d; and (4) calcining: a step of preheating the dried cellular blank body to 500 to 620 DEG C at a heating rate of 0.4 to 0.6 DEG C/min, then maintaining the cellular blank body at 500 to 620 DEG C for 5 to 7 h and then cooling the cellular blank body to 60 to 80 DEG C at a cooling rate of 0.4 to 0.6 DEG C/min so as to obtain the cellular thin-walled denitration catalyst. According to the invention, various raw materials are more uniformly mixed; on the basis of maintenance of the strength of the catalyst, the thick wall of the catalyst is turned into thin wall, bore diameter is increased, and weight per unit volume is decreased; moreover, the preparation method shortens time for drying and calcining, improves production efficiency and enables the raw materials and energy to be saved.
Description
Technical field
The invention belongs to New Inorganic Materials technical field, be specifically related to a kind of preparation method of honeycomb fashion thin-wall denitration catalyst.
Background technology
China is coal-fired big country, is also the primary emission source of nitrogen oxide, and in following iron and steel, cement, non-ferrous metal industry and various industry coal-boiler, in smoke pollution, the control work of emitting nitride is imperative.Honeycomb fashion denitration thin-walled catalyst; mainly solve the nitrogen oxide governing problem that the coal-burning utilities burning high ash powder coals such as China's iron and steel, cement, coal-burning power plant produce; by selective reduction catalyst, harmful nitrogen oxide is become harmless nitrogen and water; protect and improve our living environment, allow everybody breathe purer air.
The ature of coal of current coal-burning power plant is complicated, the non-constant of boiler smoke condition after burning.Thin-walled catalyst due to wall thickness thinning, corresponding aperture becomes large, and gas handling capacity grow, to the adaptation grow of high ash powder fire coal tail gas, thus can be good at evading above hidden danger and risk.How to make the thinning wall of catalyst heavy wall, and in normal industrial and mineral situation, making mechanical strength, denitration efficiency, antiwear property all reach designing requirement becomes the problem that urgently will solve.
Summary of the invention
The object of this invention is to provide that a kind of bulk density is less, percent opening be comparatively large, the preparation method of the honeycomb fashion thin-wall denitration catalyst of lighter in weight.
For achieving the above object, the technical solution used in the present invention is, a kind of preparation method of honeycomb fashion thin-wall denitration catalyst, comprises the following steps:
1. mixing: the first step: to get the titanium dioxide of 380-400 weight portion, the attached material of 5-6 weight portion, the water of 290-310 weight portion respectively, join in mixing roll, stir 40 ~ 50 minutes;
Second step: the water adding the titanium dioxide of 95-105 weight portion, 18-22 weight portion in mixing roll, stirs 30 ~ 40 minutes;
3rd step: add the titanium dioxide of 130-140 weight portion, the attached material of 50-53 weight portion, the water of 18-22 weight portion in mixing roll, stirs 75 ~ 85 minutes;
4th step: add the glass fibre of 35-40 weight portion, the attached material of 36-40 weight portion, the water of 95-105 weight portion in mixing roll, stirs 10 ~ 20 minutes;
5th step: add the attached material of 4.5-5.0 weight portion, the water of 8-12 weight portion in mixing roll, stirs 5 ~ 15 minutes;
2. extrusion molding: by the mass transport in mixing roll in extruder, extrudes honeycomb fashion idiosome;
3. dry: make idiosome 25 ~ 65 DEG C, relative humidity be the condition of 10 ~ 90% under dry 8 ~ 10 days;
4. calcine: dried idiosome is preheated to 500 ~ 620 DEG C, heating rate is 0.4 ~ 0.6 DEG C/min; Then keep 5 ~ 7 hours at 500 ~ 620 DEG C; Finally be cooled to 60 ~ 80 DEG C, rate of temperature fall is 0.4 ~ 0.6 DEG C/min, gets product.
Described titanium dioxide is grouped into by the one-tenth of following mass percentage: TiO
280.5-94.8%, WO
32-10%, V
2o
50.2-1.5%, all the other are SiO
2.
Preferably, described attached material is cotton, stearic acid (PEO), polyethylene glycol oxide, any one or several in lactic acid.
The beneficial effect that the present invention produces is, adopt the material calendering process in the present invention, what various raw material can be mixed is more even, can make on the basis keeping catalyst strength, makes the thinning wall of catalyst heavy wall, aperture becomes greatly, the weight alleviated in unit volume; Shorten the time in drying, calcination process, improve production efficiency, and save raw material and the energy, there is obvious economy and environment benefit.
Accompanying drawing explanation
Fig. 1 is the radial crushing strength test schematic diagram of test block;
Fig. 2 is the axial compression strength test schematic diagram of test block.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention is not limited thereto.
Embodiment 1
A preparation method for honeycomb fashion thin-wall denitration catalyst, comprises the following steps:
1. mixing: the first step: to get the titanium dioxide of 390 weight portions, the attached material of 5.5 weight portions, the water of 300 weight portions respectively, join in mixing roll, stir 45 minutes;
Second step: the water adding the titanium dioxide of 100 weight portions, 20 weight portions in mixing roll, stirs 35 minutes;
3rd step: add the titanium dioxide of 135 weight portions, the attached material of 51 weight portions, the water of 20 weight portions in mixing roll, stirs 80 minutes;
4th step: add the glass fibre of 36 weight portions, the attached material of 38 weight portions, the water of 99 weight portions in mixing roll, stirs 15 minutes;
5th step: add the attached material of 4.7 weight portions, the water of 10 weight portions in mixing roll, stirs 10 minutes;
2. extrusion molding: by the mass transport in mixing roll in extruder, extrudes the honeycomb fashion idiosome that cross section is 150mm × 150mm, hole count is 18 × 18, length is 1000mm;
3. dry: make idiosome 25 DEG C, relative humidity be the condition of 90% under dry 2 days, then 40 DEG C, relative humidity under being the condition of 70% dry 2 days, 50 DEG C, relative humidity is under the condition of 40% dry 2 days, 65 DEG C, relative humidity is under the condition of 10% dry 2 days;
4. calcine: dried idiosome is preheated to 600 DEG C, heating rate is 0.5 DEG C/min; Then keep 6 hours at 600 DEG C; Finally be cooled to 70 DEG C, rate of temperature fall is 0.5 DEG C/min, gets product.
Titanium dioxide described in the present embodiment is grouped into by the one-tenth of following mass percentage: TiO
289.5%, WO
35%, V
2o
51.1%, all the other are SiO
2.Described attached material is cotton.
Embodiment 2
A preparation method for honeycomb fashion thin-wall denitration catalyst, comprises the following steps:
1. mixing: the first step: to get the titanium dioxide of 380 weight portions, the attached material of 5 weight portions, the water of 290 weight portions respectively, join in mixing roll, stir 40 minutes;
Second step: the water adding the titanium dioxide of 95 weight portions, 18 weight portions in mixing roll, stirs 30 minutes;
3rd step: add the titanium dioxide of 130 weight portions, the attached material of 50 weight portions, the water of 18 weight portions in mixing roll, stirs 75 ~ 85 minutes;
4th step: add the glass fibre of 35 weight portions, the attached material of 36 weight portions, the water of 95 weight portions in mixing roll, stirs 10 minutes;
5th step: add the attached material of 4.5 weight portions, the water of 8 weight portions in mixing roll, stirs 5 minutes;
2. extrusion molding: by the mass transport in mixing roll in extruder, extrudes the honeycomb fashion idiosome that cross section is 150mm × 150mm, hole count is 20 × 20, length is 1000mm;
3. dry: make idiosome 30 DEG C, relative humidity be the condition of 80% under dry 2 days, then 40 DEG C, relative humidity under being the condition of 70% dry 2 days, 50 DEG C, relative humidity is under the condition of 40% dry 2 days, 60 DEG C, relative humidity is under the condition of 20% dry 3 days;
4. calcine: dried idiosome is preheated to 500 DEG C, heating rate is 0.4 DEG C/min; Then keep 7 hours at 500 DEG C; Finally be cooled to 60 DEG C, rate of temperature fall is 0.4 DEG C/min, gets product.
Titanium dioxide described in the present embodiment is grouped into by the one-tenth of following mass percentage: TiO
280.5%, WO
310%, V
2o
51.5%, all the other are SiO
2.Described attached material is polyethylene glycol oxide.
Embodiment 3
A preparation method for honeycomb fashion thin-wall denitration catalyst, comprises the following steps:
1. mixing: the first step: to get the titanium dioxide of 400 weight portions, the attached material of 6 weight portions, the water of 310 weight portions respectively, join in mixing roll, stir 50 minutes;
Second step: the water adding the titanium dioxide of 105 weight portions, 22 weight portions in mixing roll, stirs 40 minutes;
3rd step: add the titanium dioxide of 140 weight portions, the attached material of 53 weight portions, the water of 22 weight portions in mixing roll, stirs 85 minutes;
4th step: add the glass fibre of 40 weight portions, the attached material of 40 weight portions, the water of 105 weight portions in mixing roll, stirs 20 minutes;
5th step: add the attached material of 5.0 weight portions, the water of 12 weight portions in mixing roll, stirs 15 minutes;
2. extrusion molding: by the mass transport in mixing roll in extruder, extrudes the honeycomb fashion idiosome that cross section is 150mm × 150mm, hole count is 22 × 22, length is 1000mm;
3. dry: make idiosome 35 DEG C, relative humidity be the condition of 80% under dry 2 days, then 45 DEG C, relative humidity under being the condition of 70% dry 3 days, 50 DEG C, relative humidity is under the condition of 40% dry 2 days, 55 DEG C, relative humidity is under the condition of 20% dry 3 days;
4. calcine: dried idiosome is preheated to 620 DEG C, heating rate is 0.6 DEG C/min; Then keep 5 hours at 620 DEG C; Finally be cooled to 80 DEG C, rate of temperature fall is 0.6 DEG C/min, gets product.
Titanium dioxide described in the present embodiment is grouped into by the one-tenth of following mass percentage: TiO
294.8%, WO
32%, V
2o
50.2%, all the other are SiO
2.Described attached material is stearic acid.
Embodiment 4
A preparation method for honeycomb fashion thin-wall denitration catalyst, comprises the following steps:
1. mixing: the first step: to get the titanium dioxide of 390 weight portions, the attached material of 5.5 weight portions, the water of 300 weight portions respectively, join in mixing roll, stir 45 minutes;
Second step: the water adding the titanium dioxide of 100 weight portions, 20 weight portions in mixing roll, stirs 35 minutes;
3rd step: add the titanium dioxide of 130 weight portions, the attached material of 50 weight portions, the water of 22 weight portions in mixing roll, stirs 75 ~ 85 minutes;
4th step: add the glass fibre of 35 weight portions, the attached material of 36 weight portions, the water of 105 weight portions in mixing roll, stirs 10 minutes;
5th step: add the attached material of 4.5 weight portions, the water of 8 weight portions in mixing roll, stirs 15 minutes;
2. extrusion molding: by the mass transport in mixing roll in extruder, extrudes the honeycomb fashion idiosome that cross section is 150mm × 150mm, hole count is 20 × 20, length is 1000mm;
3. dry: make idiosome 35 DEG C, relative humidity be the condition of 90% under dry 3 days, then 45 DEG C, relative humidity under being the condition of 70% dry 2 days, 50 DEG C, relative humidity is under the condition of 40% dry 2 days, 65 DEG C, relative humidity is under the condition of 10% dry 2 days;
4. calcine: dried idiosome is preheated to 550 DEG C, heating rate is 0.4 DEG C/min; Then keep 6 hours at 550 DEG C; Finally be cooled to 65 DEG C, rate of temperature fall is 0.6 DEG C/min, gets product.
Titanium dioxide described in the present embodiment is grouped into by the one-tenth of following mass percentage: TiO
290.5%, WO
33%, V
2o
50.5%, all the other are SiO
2.Described attached material is lactic acid.
Test experiments
1, method of testing
Respectively the finished product of embodiment 1-3 and the existing honeycomb type flue gas denitration catalyst identical with embodiment 1-3 specification are tested as follows:
1.1 intensity test
Often kind of catalyst intercepts two test blocks, is of a size of 150 mm × 150, mm × 150 mm; Axial and the radial crushing strength (range of forcing press is 300KN, compression rate 250N/s) with pressure testing machine test.Fig. 1 and Fig. 2 be shown in by resistance to compression schematic diagram.
catalytic performance is tested
From the test test specimen that cellular catalyst cuts 3 × 3 holes, length is 300mm, be filled in reactor, measured denitration efficiency and SO under the following conditions
2oxygenation efficiency.
Test condition:
Specimen size: 3 × 3 holes, length 300mm;
Reaction temperature: 380 DEG C, SV=10,000hr
-1;
Gas composition: NO
x=180ppm, NH
3=180ppm, SO
2=500ppm, O
2=2%, H
2o=10%, N
2=surplus.
Test result is as table 1:
As can be seen from Table 1, in the honeycomb type flue gas denitration catalyst of equivalent specifications, relative to having technology mutually, honeycomb fashion thin-wall denitration catalyst bulk density of the present invention is less, percent opening is comparatively large, lighter in weight, but intensity and denitration efficiency are substantially constant.
Claims (3)
1. the preparation method of honeycomb fashion thin-wall denitration catalyst, is characterized in that, comprises the following steps:
1. mixing: the first step: to get the titanium dioxide of 380-400 weight portion, the attached material of 5-6 weight portion and the water of 290-310 weight portion respectively, join in mixing roll, stir 40 ~ 50 minutes;
Second step: add the titanium dioxide of 95-105 weight portion and the water of 18-22 weight portion in mixing roll, stirs 30 ~ 40 minutes;
3rd step: add the titanium dioxide of 130-140 weight portion, the attached material of 50-53 weight portion and the water of 18-22 weight portion in mixing roll, stirs 75 ~ 85 minutes;
4th step: add the glass fibre of 35-40 weight portion, the attached material of 36-40 weight portion and the water of 95-105 weight portion in mixing roll, stirs 10 ~ 20 minutes;
5th step: add the attached material of 4.5-5.0 weight portion and the water of 8-12 weight portion in mixing roll, stirs 5 ~ 15 minutes;
2. extrusion molding: by the mass transport in mixing roll in extruder, extrudes honeycomb fashion idiosome;
3. dry: by honeycomb fashion idiosome 25 ~ 65 DEG C, relative humidity be the condition of 10 ~ 90% under dry 8 ~ 10 days;
4. calcine: dried idiosome is preheated to 500 ~ 620 DEG C, heating rate is 0.4 ~ 0.6 DEG C/min; Then keep 5 ~ 7 hours at 500 ~ 620 DEG C; Finally be cooled to 60 ~ 80 DEG C, rate of temperature fall is 0.4 ~ 0.6 DEG C/min, gets product.
2. the preparation method of honeycomb fashion thin-wall denitration catalyst as claimed in claim 1, it is characterized in that, described titanium dioxide is grouped into by the one-tenth of following mass percentage: TiO
280.5-94.8%, WO
32-10%, V
2o
50.2-1.5%, all the other are SiO
2.
3. the preparation method of honeycomb fashion thin-wall denitration catalyst as claimed in claim 1, it is characterized in that, described attached material is any one or several in cotton, stearic acid, polyethylene glycol oxide and lactic acid.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106268773A (en) * | 2016-06-29 | 2017-01-04 | 浙江浙能催化剂技术有限公司 | A kind of thin-walled wide active temperature windows denitrating catalyst and preparation method thereof |
| CN107126949A (en) * | 2017-05-23 | 2017-09-05 | 河南康宁特环保科技股份有限公司 | A kind of SCR denitration of anti-arsenic poisoning and preparation method thereof |
| CN107335427A (en) * | 2017-09-06 | 2017-11-10 | 华电青岛环保技术有限公司 | The preparation method of the porous SCR denitration of Gas Generator Set low temperature |
| CN107983333A (en) * | 2017-11-14 | 2018-05-04 | 浙江浙能催化剂技术有限公司 | A kind of monoblock type high-temperature flue gas denitrating catalyst and preparation method thereof |
| CN108212143A (en) * | 2017-12-29 | 2018-06-29 | 浙江德创环保科技股份有限公司 | It is a kind of for denitrating catalyst of porous wide temperature window and preparation method thereof |
| CN115350697A (en) * | 2022-09-21 | 2022-11-18 | 华电青岛环保技术有限公司 | Thin-wall honeycomb type SCR denitration catalyst and preparation method thereof |
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Patent Citations (2)
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| CN103413396A (en) * | 2013-06-25 | 2013-11-27 | 常州市俊宏电器厂 | Smoke alarm |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268773A (en) * | 2016-06-29 | 2017-01-04 | 浙江浙能催化剂技术有限公司 | A kind of thin-walled wide active temperature windows denitrating catalyst and preparation method thereof |
| CN107126949A (en) * | 2017-05-23 | 2017-09-05 | 河南康宁特环保科技股份有限公司 | A kind of SCR denitration of anti-arsenic poisoning and preparation method thereof |
| CN107335427A (en) * | 2017-09-06 | 2017-11-10 | 华电青岛环保技术有限公司 | The preparation method of the porous SCR denitration of Gas Generator Set low temperature |
| CN107335427B (en) * | 2017-09-06 | 2020-06-09 | 华电青岛环保技术有限公司 | Preparation method of low-temperature porous SCR denitration catalyst for gas unit |
| CN107983333A (en) * | 2017-11-14 | 2018-05-04 | 浙江浙能催化剂技术有限公司 | A kind of monoblock type high-temperature flue gas denitrating catalyst and preparation method thereof |
| CN108212143A (en) * | 2017-12-29 | 2018-06-29 | 浙江德创环保科技股份有限公司 | It is a kind of for denitrating catalyst of porous wide temperature window and preparation method thereof |
| CN115350697A (en) * | 2022-09-21 | 2022-11-18 | 华电青岛环保技术有限公司 | Thin-wall honeycomb type SCR denitration catalyst and preparation method thereof |
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