CN113275008A - 一种co-scr脱硝催化剂及其制备方法和应用 - Google Patents
一种co-scr脱硝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 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 7
- 239000011591 potassium Substances 0.000 claims abstract description 7
- GFYMMYCBKVXBHV-UHFFFAOYSA-N [Ir].[K] Chemical compound [Ir].[K] GFYMMYCBKVXBHV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 5
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 claims description 50
- 238000003756 stirring Methods 0.000 claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 37
- 229910052681 coesite Inorganic materials 0.000 claims description 36
- 229910052906 cristobalite Inorganic materials 0.000 claims description 36
- 239000000377 silicon dioxide Substances 0.000 claims description 36
- 229910052682 stishovite Inorganic materials 0.000 claims description 36
- 229910052905 tridymite Inorganic materials 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000001035 drying Methods 0.000 claims description 27
- 239000008367 deionised water Substances 0.000 claims description 23
- 229910021641 deionized water Inorganic materials 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 18
- 229910021638 Iridium(III) chloride Inorganic materials 0.000 claims description 12
- DANYXEHCMQHDNX-UHFFFAOYSA-K trichloroiridium Chemical compound Cl[Ir](Cl)Cl DANYXEHCMQHDNX-UHFFFAOYSA-K 0.000 claims description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000000967 suction filtration Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 8
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 239000004323 potassium nitrate Substances 0.000 claims description 5
- 235000010333 potassium nitrate Nutrition 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 239000011593 sulfur Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000006555 catalytic reaction Methods 0.000 abstract description 2
- 229910000510 noble metal Inorganic materials 0.000 abstract description 2
- 239000003963 antioxidant agent Substances 0.000 abstract 1
- 230000003078 antioxidant effect Effects 0.000 abstract 1
- 238000007654 immersion Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 12
- 239000012495 reaction gas Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- PUAQLLVFLMYYJJ-UHFFFAOYSA-N 2-aminopropiophenone Chemical compound CC(N)C(=O)C1=CC=CC=C1 PUAQLLVFLMYYJJ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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Abstract
本发明涉及一种CO‑SCR脱硝催化剂及其制备方法和应用,尤其涉及一种用于CO选择性催化还原NOx的SiO2球负载铱钾双金属催化剂及其制备方法和应用,属于环境催化和大气污染控制技术领域。该催化剂采用浸渍法制备,SiO2球为载体,贵金属铱为活性组分,钾为助剂。在O2和SO2存在条件下,空速为20000h‑1时,催化剂在225‑350℃范围内的NOx转化率达到70%以上,N2选择性为100%,具有良好的抗氧和抗硫性能。本发明的催化剂可用于钢铁烧结烟气、水泥炉窑等固定源排放NOx的高效脱除。
Description
技术领域
本发明涉及一种用于CO选择性催化还原NOx的SiO2球负载铱钾双金属催化剂及其制备方法和用途,该脱硝催化剂适用于钢铁烧结烟气、水泥炉窑烟气等固定源排放废气中NOx的消除,属于环境催化和大气污染控制技术领域。
背景技术
氮氧化物(NOx)作为主要的大气污染物之一,可导致酸雨、光化学烟雾等环境问题,NOx的减排对空气质量的改善具有重要意义。NH3选择性催化还原(NH3-SCR)技术虽在电力行业NOx脱除中得到广泛应用,但将其用于非电行业烟气中NOx的控制尚存在一定的局限性。低温下NH3易与烟气中的SO2形成硫酸铵/硫酸氢铵,覆盖在NH3-SCR催化剂的表面导致其失活。另外,额外添加还原剂NH3增加了运行成本,且NH3逃逸也会造成环境污染。考虑到钢铁烧结烟气及水泥炉窑等烟气中含有CO,利用烟气中的CO选择性催化还原NOx是一种理想选择,其核心是高性能CO-SCR脱硝催化剂。因此研发在富氧条件下具有优异脱硝性能的CO-SCR催化剂引起研究者的关注。
本发明通过在SiO2球上负载铱和钾,制备了一种在富氧和SO2存在条件下对NOx脱除具有良好性能的新型CO-SCR脱硝催化剂。
发明内容
本发明的目的是提供一种对CO选择性催化还原NOx具有高活性和良好抗氧抗硫性能的复合型催化剂及其制备方法。在SiO2球负载铱钾双金属催化剂中,铱、钾和SiO2之间的协同效应促进了零价铱的生成,有利于CO的吸附活化,使催化剂显示出优异的脱硝活性、抗氧和抗硫性能。从而制得一种脱硝活性高、抗氧抗硫性能强的复合型脱硝催化剂。
本发明的目的是通过以下技术方案实现的:
采用SiO2球作为载体,贵金属Ir为活性组分,碱金属钾为助剂。其组成表示为Ir-K/SiO2,Ir的质量百分含量为0.1~1%,K的质量百分含量为1~10%。
本发明提供了一种制备SiO2球负载铱钾催化剂的方法,其特征在于该方法依次包括以下步骤:
(1)配置0.01~0.04mol/L的三氯化铱溶液,0.10~0.20mol/L的碳酸钾(氯化钾或硝酸钾)溶液;
(2)取一定量的乙醇、氨水和去离子水于三颈烧瓶中,在温度为30~40℃的水浴中搅拌,然后滴加正硅酸乙酯,升温至50~60℃并恒温搅拌2~4小时,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干12~24小时,制得SiO2球;
(3)将(2)所制得的SiO2球加入碳酸钾(氯化钾或硝酸钾)溶液中,室温下搅拌4~8小时,将制得的浆料120℃条件下烘干12~24小时,得到干燥样品;
(4)将步骤(3)中制得的样品加入三氯化铱溶液中,室温下搅拌4~8小时,将制得的浆料120℃条件下烘干12~24小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧2~8小时,制得Ir-K/SiO2催化剂。
本发明与现有技术相比,具有以下优点及突出性效果:通过采用SiO2球作为载体,Ir为活性组分,碱金属钾为助剂,它们之间的协同效应有效提高了催化剂的脱硝性能,在富氧条件和SO2存在条件下,催化剂仍显示出良好的脱硝活性和N2选择性,在225~350℃范围内,NOx的转化率达70%以上,N2选择性为100%。
附图说明
图1是0.5%Ir-10%K/SiO2催化剂的SEM图。
具体实施方式
下面结合实施例对本发明的技术方案做进一步的说明:
实施例1:0.5%Ir-1%K/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在30℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至60℃并恒温搅拌2h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干12小时,制得SiO2球;
b)取1ml 0.10mol/L的碳酸钾溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;
c)取0.65ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤b)中所制得的样品加入该溶液,室温下搅拌4小时,将制得的浆料120℃下烘干24小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧4小时,制得0.5%Ir-1%K/SiO2。
实施例2:0.5%Ir-2%K/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在40℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至60℃并恒温搅拌4h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干24小时,制得SiO2球;
b)取2ml 0.10mol/L的碳酸钾溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,搅拌4小时,将制得的浆料120℃下烘干24小时,得到干燥样品;
c)取0.65ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤b)中所制得的样品加入该溶液,室温下搅拌8小时,将制得的浆料120℃下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧8小时,制得0.5%Ir-2%K/SiO2催化剂。
实施例3:0.5%Ir-5%K/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在40℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至60℃并恒温搅拌3h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干12小时,制得SiO2球;
b)取2.5ml 0.20mol/L的碳酸钾溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,搅拌8小时,将制得的浆料120℃下烘干24小时,得到干燥样品;
c)取0.65ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤b)中所制得的样品加入该溶液,室温下搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧4小时,制得0.5%Ir-5%K/SiO2催化剂。
实施例4:0.5%Ir-10%K/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在40℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至60℃并恒温搅拌4h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干24小时,制得SiO2球;
b)取5ml 0.20mol/L的碳酸钾溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,搅拌8小时,将制得的浆料120℃下烘干24小时,得到干燥样品;
c)取0.65ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤b)中所制得的样品加入该溶液,室温下搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧4小时,制得0.5%Ir-10%K/SiO2催化剂。
实施例5:0.1%Ir-10%K/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在40℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至60℃并恒温搅拌4h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干24小时,制得SiO2球;
b)取10ml 0.20mol/L的氯化钾溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;
c)取0.52ml 0.01mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤b)中所制得的样品加入该溶液,室温下搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧6小时,制得0.1%Ir-10%K/SiO2催化剂。
实施例6:1%Ir-1%K/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在40℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至50℃并恒温搅拌4h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干24小时,制得SiO2球;
b)取2ml 0.10mol/L的硝酸钾溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,搅拌4小时,将制得的浆料120℃条件下烘干12小时,得到干燥样品;
c)取1.3ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤b)中所制得的样品加入该溶液,室温下搅拌4小时,将制得的浆料120℃条件下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧6小时,制得1%Ir-1%K/SiO2催化剂。
实施例7(参比):0.5%Ir/SiO2催化剂的制备
a)取225ml乙醇、150ml氨水、30ml去离子水于三颈烧瓶中,在40℃的水浴中搅拌,然后滴加17.5ml正硅酸乙酯,升温至60℃并恒温搅拌4h,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干24小时,制得SiO2球;
b)取0.65ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取步骤a)中所得SiO2球1g加入到该溶液中,室温下搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧4小时,制得0.5%Ir/SiO2催化剂。
实施例8(参比):0.5%Ir/SiO2-C催化剂的制备
取0.65ml 0.04mol/L的三氯化铱溶液,加入去离子水,搅拌均匀;取1g普通SiO2(标记为SiO2-C)加入到该溶液中,室温下搅拌4小时,将制得的浆料120℃下烘干12小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧4小时,制得0.5%Ir/SiO2-C催化剂。
实施例9:催化剂的制备方法与实施例1相同,将0.2g催化剂置于连续流动固定床反应器中,反应气组成为1000ppm NO,6000ppm CO,5%O2,20ppmSO2,用氮气做平衡气,反应气的流速为100ml/min,空速为20000h-1。活性评价温度范围为200~350℃,不同温度下,催化剂还原NOx的转化率见表1。
实施例10:催化剂的制备方法与实施例2相同,将0.2g催化剂置于连续流动固定床反应器中,反应气组成为1000ppm NO,6000ppm CO,5%O2,20ppmSO2,用氮气做平衡气,反应气的流速为100ml/min,空速为20000h-1。活性评价温度范围为200~350℃,不同温度下,催化剂还原NOx的转化率见表1。
实施例11:催化剂的制备方法与实施例3相同,将0.2g催化剂置于连续流动固定床反应器中,反应气组成为1000ppm NO,6000ppm CO,5%O2,20ppmSO2,用氮气做平衡气,反应气的流速为100ml/min,空速为20000h-1。活性评价温度范围为200~350℃,不同温度下,催化剂还原NOx的转化率见表1。
实施例12:催化剂的制备方法与实施例4相同,将0.2g催化剂置于连续流动固定床反应器中,反应气组成为1000ppm NO,6000ppm CO,5%O2,20ppmSO2,用氮气做平衡气,反应气的流速为100ml/min,空速为20000h-1。活性评价温度范围为200~350℃,不同温度下催化剂还原NOx的转化率见表1。
实施例13:催化剂的制备方法与实施例5相同,将0.2g催化剂置于连续流动固定床反应器中,反应气组成为1000ppm NO,6000ppm CO,5%O2,20ppmSO2,用氮气做平衡气,反应气的流速为100ml/min,空速为20000h-1。活性评价温度范围为200~350℃,不同温度下催化剂还原NOx的转化率见表1。
实施例14:催化剂的制备方法与实施例6相同,将0.2g催化剂置于连续流动固定床反应器中,反应气组成为1000ppm NO,6000ppm CO,5%O2,20ppmSO2,用氮气做平衡气,反应气的流速为100ml/min,空速为20000h-1。活性评价温度范围为200~350℃,不同温度下催化剂还原NOx的转化率见表1。
表1催化剂活性评价结果
Claims (3)
1.一种用于CO选择性催化还原NOx的SiO2球负载铱钾双金属催化剂,其特征在于:该催化剂以球形SiO2作为载体,铱为活性组分,钾为助剂,其组成表示为Ir-K/SiO2,Ir的质量百分含量为0.1~1%,K的质量百分含量为1~10%。
2.一种制备如权利要求1所述的SiO2球负载铱钾催化剂的方法,其特征在于该方法依次包括以下步骤:
(1)配置0.01~0.04mol/L的三氯化铱溶液,0.10~0.20mol/L的碳酸钾(氯化钾或硝酸钾)溶液;
(2)取一定量的乙醇、氨水和去离子水于三口烧瓶中,在温度为30~40℃的水浴中搅拌,然后滴加正硅酸乙酯,升温至50~60℃并恒温搅拌2~4小时,然后停止加热并冷至室温,抽滤洗涤,所得滤料120℃下烘干12~24小时,制得SiO2球;
(3)将(2)所制得的SiO2球加入碳酸钾(氯化钾或硝酸钾)溶液中,室温下搅拌4~8小时,将制得的浆料120℃下烘干12~24小时,得到干燥样品;
(4)将步骤(3)中制得的样品加入三氯化铱溶液中,室温下搅拌4~8小时,将制得的浆料120℃条件下烘干12~24小时,得到干燥样品;将样品置于马弗炉中在500℃条件下焙烧2~8小时,制得Ir-K/SiO2催化剂。
3.如权利要求1所述SiO2球负载铱钾双金属催化剂的应用,其特征在于:用于钢铁烧结烟气、水泥炉窑烟气等固定源排放NOx的高效脱除。
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