CN111672536A - 一种用于甲醛净化的贵金属催化剂及其制备方法 - Google Patents
一种用于甲醛净化的贵金属催化剂及其制备方法 Download PDFInfo
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 183
- 239000003054 catalyst Substances 0.000 title claims abstract description 60
- 238000000746 purification Methods 0.000 title claims abstract description 44
- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 22
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 22
- 239000002808 molecular sieve Substances 0.000 claims abstract description 22
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 18
- 150000003624 transition metals Chemical class 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims description 97
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 238000003756 stirring Methods 0.000 claims description 53
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- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000001354 calcination Methods 0.000 claims description 17
- 238000010992 reflux Methods 0.000 claims description 14
- 239000012279 sodium borohydride Substances 0.000 claims description 10
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 10
- 239000012266 salt solution Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims 1
- 229910052763 palladium Inorganic materials 0.000 claims 1
- 229910052697 platinum Inorganic materials 0.000 claims 1
- 229910052709 silver Inorganic materials 0.000 claims 1
- 230000003197 catalytic effect Effects 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 2
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000001569 carbon dioxide Substances 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 16
- 239000000843 powder Substances 0.000 description 15
- 229910019029 PtCl4 Inorganic materials 0.000 description 11
- 239000000203 mixture Substances 0.000 description 6
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910003609 H2PtCl4 Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 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 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 210000002345 respiratory system Anatomy 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 1
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 208000001894 Nasopharyngeal Neoplasms Diseases 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229940011182 cobalt acetate Drugs 0.000 description 1
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000037336 dry skin Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229960004279 formaldehyde Drugs 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000011565 manganese chloride Substances 0.000 description 1
- 229940099607 manganese chloride Drugs 0.000 description 1
- 235000002867 manganese chloride Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229940062057 nitrogen 80 % Drugs 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229940063746 oxygen 20 % Drugs 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/42—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing iron group metals, noble metals or copper
- B01J29/46—Iron group metals or copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/48—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing arsenic, antimony, bismuth, vanadium, niobium tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/16—Reducing
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
- B01J2229/186—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself not in framework positions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/20—After treatment, characterised by the effect to be obtained to introduce other elements in the catalyst composition comprising the molecular sieve, but not specially in or on the molecular sieve itself
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Abstract
本发明公开一种用于甲醛净化的负载型贵金属催化剂及其制备方法。催化剂由ZSM‑5型分子筛载体、过渡金属助剂、贵金属活性组分和碱金属助剂组成。以催化剂的重量为100%计,碱金属的质量分数为0.1~2%,过渡金属助剂的质量分数为0.01~5%,贵金属的质量百分比0.1%。所提供的催化剂具有制备方法简单、贵金属用量低和在室温条件下就可将甲醛完全催化转化为二氧化碳和水,并且可长时间稳定操作。
Description
技术领域
本发明涉及一种贵金属负载型催化剂,更具体的,涉及一种用于净化室内空气中主要污染物甲醛的贵金属催化剂及其制备方法。
背景技术
室内装修空气污染的甲醛来源主要是人造板材、墙纸、墙布、涂料等装修材料。因其在制作过程中使用了脲醛树脂、酚醛树脂、三聚氰胺甲醛树脂等含有甲醛的胶黏剂,其中的游离甲醛会从该材料逐渐释放,造成室内空气甲醛污染。甲醛对眼睛、呼吸道及皮肤具有较强刺激性,长期接触低浓度甲醛可产生轻度眼部及上呼吸道不适、皮肤干燥、皲裂等症状;高浓度条件下,甲醛还能引起鼻咽部肿瘤等重大疾病。因此,研究有效消除室内甲醛污染的相关技术以改善人们室内生活环境十分必要。
常见的室内甲醛消除方法有物理吸附法、植物吸收法、等离子体法、光催化法和催化氧化法等。催化燃烧法因具有消除温度低、能耗低、效率髙、无二次污染和适用范围广等优点而受到广泛研究。但实际应用时,由于室内甲醛浓度一般较低(通常为ppm级),催化效率受传质影响较大,因此,各种具有富集功能的甲醛催化净化催化剂受到广泛关注。Chen等(Catal.Today 258(2015)56-63)报道了以具有吸附储存功能的ZSM-5分子筛为载体和贵金属为活性组分的甲醛净化催化剂。Chen等(Catal.Today 281(2017)512-519)报道了以具有吸附储存功能的ZSM-5分子筛为载体和Au为活性组分的甲醛净化催化剂。虽然吸附储存功能在甲醛催化氧化催化剂开发中已获得认可和应用,但该类型催化剂依然存在贵金属用量高、制备复杂和甲醛催化净化效率低等问题,难以在甲醛净化领域得到实际有效利用。
发明内容
本发明旨在克服现有甲醛净化催化剂的问题,提供一种制备简单、新型高效且低成本的贵金属甲醛净化催化剂。
为了实现上述目的,本发明采用如下的技术方案:一种用于甲醛净化的贵金属催化剂,由ZSM-5分子筛载体、过渡金属助剂、贵金属组分和碱金属助剂组成,上述用于甲醛净化的催化剂制备方法,包括如下步骤:1)将ZSM-5载体搅拌分散在过渡金属盐溶液中,加热回流一段时间后,过滤洗涤干燥并高温煅烧得到过渡金属改性的载体;2)将改性后的载体分散于碱性溶液中,加入一定量的贵金属盐溶液后加热搅拌一段时间;3)而后在一定反应温度下加入NaBH4溶液,继续搅拌一段时间后,过滤洗涤干燥得到所述分子筛型催化剂。
作为优选的,在上述的制备方法中,所述过渡金属盐溶液为过渡金属的硝酸盐、氯化盐、乙酸盐、硫酸盐中的一种或几种的水溶液,所述过渡金属为铁、钴、镍、铜、锰、铈中的一种或几种。
作为优选的,在上述的制备方法中,步骤1)中所述过渡金属盐溶液浓度为0.01~2mol/L,加热回流温度为40~120℃,回流时间为1~12h。
作为优选的,在上述的制备方法中,步骤1)中所述煅烧温度为200~700℃,煅烧时间为2~6h。
作为优选的,在上述的制备方法中,步骤2)中所述溶液中加热搅拌温度为40~90℃,加热搅拌时间为1~6h。
作为优选的,在上述的制备方法中,步骤3)中所述搅拌温度为0~60℃,搅拌时间为0.5~6h,NaBH4溶液浓度为0.01~2mol/L。
作为优选的,以催化剂的重量为100%计,过渡金属的质量分数为0.01%~5%,碱金属的质量分数为0.01~2%,贵金属的质量百分比为0.1%。
与现有技术相比,本发明具有如下有益效果:1.制备方法简单,易于大规模生产;2.本发明的用于甲醛净化的催化剂通过简单的过渡金属改性极大的降低了催化剂成本,具有低成本、室温净化催化效率高、使用寿命长等特点。
具体实施方式
下面结合一些具体实施方式对本发明涉及的用于甲醛净化的催化剂及其制备方法做进一步描述。具体实施例为进一步详细说明本发明,非限定本发明的保护范围。除非特别说明,本发明实施例采用的方法和原料均为本领域常规选择。
实施例1甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入2mol/L的氯化铁溶液中,120℃加热搅拌回流12h后,过滤除去溶液并将所得固体洗涤干燥,在空气中700℃煅烧6h,得到改性后的ZSM-5。而后在室温条件下,将改性的ZSM-5粉末倒入碱金属质量分数为2%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,90℃下搅拌6h后,调节溶液温度为60℃,加入2mol/L的NaBH4溶液,搅拌6h后过滤洗涤干燥得到甲醛净化催化剂。
实施例2甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入1mol/L的醋酸钴溶液中,100℃加热搅拌回流10h后,过滤除去溶液并将所得固体洗涤干燥,在空气中600℃煅烧5h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,80℃下搅拌5h后,调节溶液温度为50℃,加入1.5mol/L的NaBH4溶液,搅拌5h后过滤洗涤干燥得到甲醛净化催化剂。
实施例3甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.5mol/L的硝酸镍溶液中,80℃加热搅拌8h后,过滤除去溶液并将所得固体洗涤干燥,在空气中500℃煅烧4h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为0.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,70℃下搅拌4h后,调节溶液温度为40℃,加入1mol/L的NaBH4溶液,搅拌4h后过滤洗涤干燥得到甲醛净化催化剂。
实施例4甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.1mol/L的硫酸铜溶液中,60℃加热搅拌6h后,过滤除去溶液并将所得固体洗涤干燥,在空气中400℃煅烧3h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的氯钯酸钠溶液,60℃下搅拌3h后,调节溶液温度为30℃,加入0.5mol/L的NaBH4溶液,搅拌3h后过滤洗涤干燥得到甲醛净化催化剂。
实施例5甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.05mol/L的氯化锰溶液中,40℃加热搅拌4h后,过滤除去溶液并将所得固体洗涤干燥,在空气中300℃煅烧2h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的氯金酸溶液,50℃下搅拌2h后,调节溶液温度为20℃,加入0.1mol/L的NaBH4溶液,搅拌2h后过滤洗涤干燥得到甲醛净化催化剂。
实施例6甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.01mol/L的硝酸铈溶液中,80℃加热搅拌回流2h后,过滤除去溶液并将所得固体洗涤干燥,在空气中200℃煅烧4h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为2%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的硝酸银溶液,40℃下搅拌1h后,调节溶液温度为10℃,加入0.05mol/L的NaBH4溶液,搅拌1h后过滤洗涤干燥得到甲醛净化催化剂。
实施例7甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.5mol/L的硝酸铁溶液中,80℃加热搅拌回流3h后,过滤除去溶液并将所得固体洗涤干燥,在空气中400℃煅烧3h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,70℃下搅拌3h后,调节溶液温度为20℃,加入0.1mol/L的Na的NaBH4溶液,搅拌3h后过滤洗涤干燥得到甲醛净化催化剂。
实施例8甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.5mol/L的硝酸钴溶液中,80℃加热搅拌回流4h后,过滤除去溶液并将所得固体洗涤干燥,在空气中300℃煅烧6h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,80℃下搅拌5h后,调节溶液温度为30℃,加入1mol/L的NaBH4溶液,搅拌3h后过滤洗涤干燥得到甲醛净化催化剂。
实施例9甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.3mol/L的硝酸镍溶液中,80℃加热搅拌回流4h后,过滤除去溶液并将所得固体洗涤干燥,在空气中200℃煅烧5h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,60℃下搅拌2h后,调节溶液温度为50℃,加入0.2mol/L的NaBH4溶液,搅拌4h后过滤洗涤干燥得到甲醛净化催化剂。
实施例10甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.3mol/L的硝酸镍溶液中,80℃加热搅拌回流4h后,过滤除去溶液并将所得固体洗涤干燥,在空气中300℃煅烧6h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,60℃下搅拌2h后,调节溶液温度为50℃,加入0.1mol/L的NaBH4溶液,搅拌4h后过滤洗涤干燥得到甲醛净化催化剂。
实施例11甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入1.5mol/L的硝酸钴溶液中,60℃加热搅拌回流8h后,过滤除去溶液并将所得固体洗涤干燥,在空气中400℃煅烧3h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,80℃下搅拌5h后,调节溶液温度为30℃,加入1mol/L的NaBH4溶液,搅拌3h后过滤洗涤干燥得到甲醛净化催化剂。
实施例12甲醛净化催化剂的制备
在室温条件下,将一定量的ZSM-5分子筛加入0.01mol/L的硝酸镍溶液中,110℃加热搅拌回流5h后,过滤除去溶液并将所得固体洗涤干燥,在空气中400℃煅烧3h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,80℃下搅拌2h后,调节溶液温度为10℃,加入0.1mol/L的NaBH4溶液,搅拌4h后过滤洗涤干燥得到甲醛净化催化剂。
对比例1
在室温条件下,将NaOH固体溶于去离子水中,配制成0.05mol/L的NaOH溶液。按最终产品碱金属Na的质量分数为1%、贵金属Pt质量分数为0.1%的比例,将ZSM-5分子筛倒入并充分分散在此溶液中。最后加入H2PtCl4溶液,搅拌一段时间后,在80℃搅拌蒸发除去水分、100℃干燥6小时、H2气氛400℃煅烧3h得到最终产品。
对比例2
在80℃条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,80℃下搅拌4h后,加入0.1mol/L的NaBH4溶液,搅拌4h后过滤洗涤干燥得到甲醛净化催化剂。
对比例3
在室温条件下,将一定量的ZSM-5分子筛加入0.1mol/L的硝酸镍溶液中,80℃加热搅拌回流3h后,过滤除去溶液并将所得固体洗涤干燥,在空气中500℃煅烧3h,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,搅拌一段时间后,80℃下加热蒸干,而后将得到的样品80℃真空干燥。将样品分散于三口烧瓶中,加入5mL的甲醛(37%)溶液并在70℃下加热还原,过滤洗涤干燥得到甲醛净化催化剂。
对比例4
在室温条件下,将一定量的ZSM-5分子筛加入0.1mol/L的硝酸镍溶液中,80℃加热搅拌回流3h后,过滤除去溶液并将所得固体洗涤干燥,得到改性后的ZSM-5。而后在室温条件下,将ZSM-5粉末倒入碱金属质量分数为1.5%的NaOH溶液中,搅拌分散后加入,贵金属质量分数为0.1%的H2PtCl4溶液,搅拌一段时间后,80℃下加热蒸干,而后将得到的样品80℃真空干燥。将样品分散于三口烧瓶中,加入0.1mol/L的NaBH4溶液,并在70℃下加热还原,过滤洗涤干燥得到甲醛净化催化剂。
分别取200mg上述实施例和对比例所制备的催化剂,放置于管式固定床反应器中进行实验,实验条件如下:室温(~30℃),氧气20%,氮气80%,甲醛气体用鼓泡,由氮气吹入反应体系,控制反应器进口甲醛浓度为50mg/m3,反应空速(GHSV)为30000ml g-1h-1,活性评价结果如表1所示。
表1甲醛净化催化剂的活性评价结果
由表1的测试结果可知,在本发明的制备方法和工艺条件下,制备得到的催化剂的甲醛催化净化性能显著好于未经过过渡金属助剂修饰的催化剂。
本行业的技术人员应该了解,上述实施例仅例示性说明本发明的原理及其功效,而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下,对上述实施例进行修饰或改变。因此,举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变,仍应由本发明的权利要求所涵盖。
Claims (6)
1.一种用于甲醛净化的贵金属催化剂及其制备方法,其特征在于:所述催化剂由ZSM-5型分子筛载体、过渡金属助剂、贵金属活性组分和碱金属助剂组成。
2.权利要求1所述催化剂的制备方法,其特征在于,包括如下步骤:1)将ZSM-5载体搅拌分散在过渡金属盐溶液中,加热回流一段时间后,过滤洗涤干燥并高温煅烧得到过渡金属改性的载体;2)将改性后的载体分散于碱性溶液中,加入一定量的贵金属盐溶液后加热搅拌一段时间;3)在一定温度下加入NaBH4溶液,继续搅拌一段时间后,过滤洗涤干燥得到所述分子筛型催化剂。
3.如权利要求1和2所述的催化剂,其特征在于,所述的过渡金属盐溶液为铁、镍、钴、锰、铜、铈的盐溶液中的一种或多种,碱溶液为NaOH溶液,贵金属活性组分为Pt、Ag、Au、Pd中的一种。
4.根据权利要求2所述的制备方法,其特征在于,步骤1)中过渡金属盐溶液浓度为0.01~2mol/L,加热回流温度为40~120℃,回流时间为1~12h,煅烧温度为200~700℃,煅烧时间为2~6h。步骤2)中加热搅拌温度为40~90℃,加热搅拌时间为1~6h,步骤3)中搅拌温度为0~60℃,搅拌时间为0.5~6h,NaBH4溶液浓度为0.01~2mol/L。
5.权利要求1~4所述的催化剂,其特征在于,以催化剂的重量为100%计,过渡金属的质量分数为0.01~5%,碱金属的质量分数为0.01-2%,贵金属的质量百分比为0.1%。
6.一种根据权利要求2任意一项方法制备得到的甲醛净化催化剂。
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CN113578374A (zh) * | 2021-07-30 | 2021-11-02 | 芜湖美的厨卫电器制造有限公司 | 一种除异味催化剂及其制备方法和应用 |
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