CN106166493A - 一种整体式低温scr催化剂及其制备方法和应用 - Google Patents
一种整体式低温scr催化剂及其制备方法和应用 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical group [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 10
- 239000007864 aqueous solution Substances 0.000 claims description 12
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 5
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 2
- 238000001802 infusion Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 231100000567 intoxicating Toxicity 0.000 abstract description 2
- 230000002673 intoxicating effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 229910019714 Nb2O3 Inorganic materials 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
本发明涉及一种整体式低温SCR催化剂及其制备方法,属于工业脱硝技术领域。该催化剂是以堇青石蜂窝陶瓷为载体,活性组分为氧化锰,属于环境友好型催化剂。该整体式催化剂制备方法简单,便于大规模工业化使用,活性组分均匀分布在载体表面,提高了活性组分的利用率。该整体式SCR催化剂可用于工业低温脱硝工况,在125~225度温度内脱硝率达到80%以上,100度情况下能还能达到75%以上脱硝率,可以将SCR反应器布置在除尘和脱硫装置和之后,避免了催化剂在使用过程中出现的孔道堵塞和中毒现象,提高了催化剂的使用寿命。
Description
技术领域
本发明涉及一种整体式低温SCR催化剂及其制备方法,具体是一种氧化锰为活性组分,氧化铁或氧化钴为助催化剂的整体式SCR催化剂及其制备方法。适用于低温NOx气体的消除,在工业脱硝技术领域具有应用前景。
背景技术
随着我国经济的快速发展,能源消耗量大幅度增加,与此相应,大气的污染程度也日益加剧,目前,我国95%以上的火电厂是以燃煤为主,燃煤过程中排放出大量的氮氧化物、二氧化硫和颗粒物。除尘技术和烟气脱硫技术日趋成熟,烟气脱硫除尘已经有序的进行;唯有氮氧化物的污染尚未得到有效控制,这是因为脱硝技术没有达到预期的效果。国家在2014年颁布了《锅炉大气污染物排放标准》,进一步严格控制氮氧化物的排放值。针对我国自身的特点,积极研究和开发烟气脱硝技术,以满足环境保护的要求,具有重要的环境、经济和社会意义。
国内大部分的脱硫系统采用湿法脱硫技术,湿法脱硫后的烟气温度在100℃一下,因此对催化剂的低温脱硝性能要求很高,目前现有的SCR催化剂在相对较低的温度下脱硝性能不够理想。发明专利CN 105363434A《一种锰基SCR低温脱硝催化剂及其制备方法》公开了一种锰基SCR低温脱硝催化剂,通过MnO2、CeO2、Nb2O3三者的配合,在整体上实现了在150~260℃范围内催化剂的脱硝效率达到90%以上,但是在较低温度下脱硝性能一般,不能满足湿法脱硫之后的使用工况。
发明内容
本发明的目的是为了克服现有技术的不足,提供一种整体式低温SCR催化剂及其制备方法。
一种整体式低温SCR催化剂的制备方法,其特征在于,所述的载体采用等体积浸渍法制备,具体包括如下步骤:
将硝酸盐溶解到一定体积的水溶液中,然后将一定体积的堇青石蜂窝陶瓷放入到硝酸盐水溶液中,溶液刚好被载体所吸收,静置1~4h后在50~100℃烘箱中烘干,然后在200~500℃马弗炉中焙烧2~8h;
所述硝酸盐为硝酸钴、硝酸铁的一种或两种,硝酸盐水溶液的浓度为0.1~0.5mol/L;所述的堇青石蜂窝陶瓷孔密度为100~400孔/平方英寸。
采用等体积浸渍法将活性组分氧化锰担载到改性载体上,包括以下步骤:
将一定体积的改性载体放入到一定体积的硝酸锰水溶液中,硝酸锰溶液被载体所吸收,静置1~4h后再将载体放入到一定体积的浓氨水溶液中,浓氨水被载体所吸收,静置1~4h后在50~100℃烘箱中烘干,然后在200~500℃马弗炉中焙烧2~8h;
所述的硝酸锰水溶液的浓度为1.0~4.0 mol/L。
一种整体式低温SCR催化剂,其特征在于,根据上述所述方法制备得到;该催化剂的活性组分为氧化锰,载体为改性堇青石蜂窝陶瓷载体;
所述活性组分在催化剂中的质量百分比为5%-15%,其余为载体。
一种整体式低温SCR催化剂在SCR脱硝反应的应用。
本发明具有以下优点:
不需引入有机粘合剂,防止催化剂活性位被覆盖。制备工艺简单,催化剂涂层均匀,且不易从堇青石上脱落。催化剂脱硝性能优良,能在125~225度温度内脱硝率达到80%以上,100度情况下能还能达到75%以上脱硝率,可以将SCR反应器布置在除尘和脱硫装置和之后,避免了催化剂在使用过程中出现的孔道堵塞和中毒现象,提高了催化剂的使用寿命。
具体实施方式
以下实例用于更详细的说明本发明,但本发明并不限于此。
对比例:
将1L堇青石蜂窝陶瓷载体放入到120mL 4.3 mol/L 的硝酸锰水溶液中,硝酸锰溶液被载体完全吸收,静置2h后再将载体放入到100 mL的浓氨水溶液中,浓氨水被载体所吸收,静置2h后在100℃烘箱中烘干,然后在400℃马弗炉中焙烧4h。
对上述制备的催化剂进行NH3-SCR脱硝性能测试:将整体式催化剂切成底面直径为1cm、高度为5cm的圆柱体(体积为4cm3),空速7500 h-1,模拟烟气成分:200ppm NO、200ppmNH3、5% O2、平衡气为N2。使用二氧化碳分析仪(Thermo,Model 42i)进行产物分析,测试结果见表1。
实施例1:
将1L堇青石蜂窝陶瓷载体放入到120mL 0.5 mol/L 的硝酸钴水溶液中,硝酸钴溶液被载体完全吸收,静置2h后在100℃烘箱中烘干,然后在400℃马弗炉中焙烧4h,得到钴改性的堇青石蜂窝陶瓷。
将1L钴改性后的堇青石蜂窝陶瓷载体放入到120mL 4.3 mol/L 的硝酸锰水溶液中,硝酸锰溶液被载体完全吸收,静置2h后再将载体放入到100 mL的浓氨水溶液中,浓氨水被载体所吸收,静置2h后在100℃烘箱中烘干,然后在400℃马弗炉中焙烧4h,得到整体式SCR催化剂。
催化剂评价方法同对比例1,。测试结果见表1。
实施例2:
将实施例1中120mL 0.5 mol/L 的硝酸钴水溶液中改成120mL 0.5 mol/L 的硝酸铁水溶液中,其余制备方法同实施例1。催化剂评价方法同对比例。测试结果见表1。
表1 催化剂脱硝率数据
Claims (4)
1.一种整体式低温SCR催化剂的制备方法,其特征在于,所述的载体采用等体积浸渍法制备,具体包括如下步骤:
将硝酸盐溶解到一定体积的水溶液中,然后将一定体积的堇青石蜂窝陶瓷放入到硝酸盐水溶液中,溶液刚好被载体所吸收,静置1~4h后在50~100℃烘箱中烘干,然后在200~500℃马弗炉中焙烧2~8h;
所述硝酸盐为硝酸钴、硝酸铁的一种或两种,硝酸盐水溶液的浓度为0.1~0.5mol/L;所述的堇青石蜂窝陶瓷孔密度为100~400孔/平方英寸。
2.根据权利要求1所述一种整体式低温SCR催化剂的制备方法,其特征在于,采用等体积浸渍法将活性组分氧化锰担载到改性载体上,包括以下步骤:
将一定体积的改性载体放入到一定体积的硝酸锰水溶液中,硝酸锰溶液被载体所吸收,静置1~4h后再将载体放入到一定体积的浓氨水溶液中,浓氨水被载体所吸收,静置1~4h后在50~100℃烘箱中烘干,然后在200~500℃马弗炉中焙烧2~8h;
所述的硝酸锰水溶液的浓度为1.0~4.0 mol/L。
3.一种整体式低温SCR催化剂,其特征在于,根据权利要求1或2所述方法制备得到;该催化剂的活性组分为氧化锰,载体为改性堇青石蜂窝陶瓷载体;
所述活性组分在催化剂中的质量百分比为5%-15%,其余为载体。
4.根据权利要求3所述一种整体式低温SCR催化剂在SCR脱硝反应的应用。
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CN109482226A (zh) * | 2018-10-29 | 2019-03-19 | 昆明贵研催化剂有限责任公司 | 一步法制备过渡金属改性的分子筛整体式催化剂及方法 |
CN111686716A (zh) * | 2020-07-29 | 2020-09-22 | 江西省环境保护科学研究院 | WOx改性碳纳米管负载金属氧化物的低温SCR烟气脱硝催化剂及制备方法与应用 |
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CN107537514A (zh) * | 2017-07-21 | 2018-01-05 | 上海纳米技术及应用国家工程研究中心有限公司 | 锰铁钴整体式scr低温催化剂制备方法、产品和其应用 |
CN109482226A (zh) * | 2018-10-29 | 2019-03-19 | 昆明贵研催化剂有限责任公司 | 一步法制备过渡金属改性的分子筛整体式催化剂及方法 |
CN111686716A (zh) * | 2020-07-29 | 2020-09-22 | 江西省环境保护科学研究院 | WOx改性碳纳米管负载金属氧化物的低温SCR烟气脱硝催化剂及制备方法与应用 |
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