CN107207274A - 一种具有多核共壳结构的微米氧化铈颗粒及其制备方法 - Google Patents
一种具有多核共壳结构的微米氧化铈颗粒及其制备方法 Download PDFInfo
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- CN107207274A CN107207274A CN201580073404.6A CN201580073404A CN107207274A CN 107207274 A CN107207274 A CN 107207274A CN 201580073404 A CN201580073404 A CN 201580073404A CN 107207274 A CN107207274 A CN 107207274A
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- Prior art keywords
- cerium oxide
- cerium
- oxide particle
- micron
- nano
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- 229910000420 cerium oxide Inorganic materials 0.000 title claims abstract description 135
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 239000002245 particle Substances 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 27
- 230000002776 aggregation Effects 0.000 claims abstract description 20
- 238000004220 aggregation Methods 0.000 claims abstract description 19
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 18
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 239000000725 suspension Substances 0.000 claims description 42
- 229910052684 Cerium Inorganic materials 0.000 claims description 30
- 239000006185 dispersion Substances 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 29
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 27
- 239000003153 chemical reaction reagent Substances 0.000 claims description 24
- 230000001376 precipitating effect Effects 0.000 claims description 24
- 239000012695 Ce precursor Substances 0.000 claims description 22
- VGBWDOLBWVJTRZ-UHFFFAOYSA-K cerium(3+);triacetate Chemical compound [Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O VGBWDOLBWVJTRZ-UHFFFAOYSA-K 0.000 claims description 19
- 239000006259 organic additive Substances 0.000 claims description 19
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- 150000000703 Cerium Chemical class 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 7
- 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 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 239000000908 ammonium hydroxide Substances 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- OZECDDHOAMNMQI-UHFFFAOYSA-H cerium(3+);trisulfate Chemical compound [Ce+3].[Ce+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O OZECDDHOAMNMQI-UHFFFAOYSA-H 0.000 claims description 6
- 229910000333 cerium(III) sulfate Inorganic materials 0.000 claims description 6
- 229920000609 methyl cellulose Polymers 0.000 claims description 6
- 239000001923 methylcellulose Substances 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 2
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 claims description 2
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 2
- 239000012798 spherical particle Substances 0.000 claims description 2
- 239000002243 precursor Substances 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 49
- 230000003197 catalytic effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 239000005416 organic matter Substances 0.000 abstract description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 13
- 230000032683 aging Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 238000001027 hydrothermal synthesis Methods 0.000 description 11
- 239000011148 porous material Substances 0.000 description 10
- 229910052723 transition metal Inorganic materials 0.000 description 10
- 150000003624 transition metals Chemical class 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 9
- 229910000510 noble metal Inorganic materials 0.000 description 9
- 241001012508 Carpiodes cyprinus Species 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical group [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- -1 cerium ion Chemical class 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 125000001967 indiganyl group Chemical group [H][In]([H])[*] 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000002468 redox effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 229910021524 transition metal nanoparticle Inorganic materials 0.000 description 1
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Abstract
本发明涉及一种具有多核共壳结构的微米氧化铈颗粒,其包括:氧化铈壳层,该壳层由晶态和/或非晶态纳米氧化铈颗粒构成;和位于所述壳层内部的多个纳米氧化铈晶粒核聚集体。本发明还涉及具有多核共壳结构的微米氧化铈颗粒的制备方法。以本发明的微米氧化铈颗粒为载体的负载型催化剂水热稳定性好、抗硫性好且负载的催化剂活性组分不易被包埋,在CO、NO或挥发性有机物等的尾气催化氧化领域具有很好的应用前景。
Description
本发明涉及无机先进纳微米材料技术领域,尤其涉及催化剂载体技术领域。
氧化铈是一种重要的稀土氧化物,其作为催化剂载体及载体的添加剂具有许多优良的性能,在催化研究中已得到人们的充分肯定。在后续的研究中,人们发现氧化铈以其良好的储放氧性能及较强的三价铈离子和四价铈离子之间的氧化还原性能,作为催化剂载体时在氧化反应、甲醇裂解及氮氧化物的还原等反应中显示了其独特的优势。
氧化铈的物理和化学性能极大地依赖于本身的微观结构,如尺度、形貌、比表面积等,具有微纳米分级多孔结构的氧化铈材料不仅能很好的满足高效吸附材料对自身微观结构的要求,同时也可以通过增大比表面积来增加表面催化活性位点,从而提高氧化铈的催化性能,因此研究制备此类材料具有重要的现实意义。但采用目前已有方法制得的具有大比表面积的纳微米氧化铈颗粒、氧化铈气凝胶等作为催化剂载体,在使用过程中又发现其机械强度和耐高温性能差,容易在高温状态下发生烧结及中空结构塌陷的情况。
当应用于含有CO、NO或挥发性有机物等的尾气催化后处理领域时,以常规结构的氧化铈作为催化剂载体制备的负载型催化剂具有以下缺点:
1)水热稳定性差;载体本身容易在高温状态下发生烧结及中空结构塌陷的现象,造成比表面积和孔隙率降低;
2)所负载的贵金属或过渡金属等活性组分在高温水热老化过程中易被包埋;
3)抗硫性差,长期暴露在含硫气氛中会导致催化剂失活。
上述问题严重限制了氧化铈材料在包括固定源和移动源在内的尾气催化后处理领域的应用。因此,如何在维持纳米氧化铈载体的高比表面积的同时又保证其机械强度和耐高温等性能成为目
前值得关注的课题。
发明内容
为了解决上述问题,提出本发明。
本发明第一方面涉及一种具有多核共壳结构的微米氧化铈颗粒,其包括:
氧化铈壳层,该壳层由晶态和/或非晶态纳米氧化铈颗粒构成;和
位于所述壳层内部的多个纳米氧化铈晶粒核聚集体。
优选地,所述壳层由晶态纳米氧化铈颗粒构成。所述纳米氧化铈晶粒核的数目可以是数千个、数万个、甚至数百万个。本发明的具有多核共壳结构的微米氧化铈颗粒,其中的壳层可以对内部的纳米氧化铈晶粒核聚集体进行保护,从而提高其各方面性能。
在优选的实施方案中,所述微米氧化铈颗粒为球型或类球形颗粒,平均粒径为0.5μm-50μm,优选1-10μm;BET比表面积为50-200m2/g,孔体积为0.1-0.8cm3/g,平均孔径为2-40nm;其中所述壳层内部的多个纳米氧化铈晶粒核聚集体的质量占所述微米氧化铈颗粒总质量的99-85%,所述氧化铈壳层的质量占所述微米氧化铈颗粒总质量的1-15%,其中,所述壳层内部的多个纳米氧化铈晶粒核聚集体的质量和所述氧化铈壳层的质量可以通过控制沉积条件来控制;所述氧化铈壳层的厚度为10-200nm,优选20-100nm;所述纳米氧化铈晶粒的平均粒径为2-50nm,优选2-40nm,优选2-30nm,优选2-20nm,优选2-10nm;所述氧化铈壳层中的晶态和/或非晶态纳米氧化铈颗粒的平均粒径为2-50nm。
所述纳米氧化铈晶粒核聚集体和所述氧化铈壳层都具是多孔的,即具有很多微观孔道或孔口,以便于反应物和反应产物的扩散进出。这些微观孔道或孔口形成过程如下:由众多微粒团聚在一起时的微粒间隙构成的;或者,如下文所述当在制备过程中使用有机助剂时,有机助剂在沉淀过程中被夹带在固体颗粒中,煅烧后有机助剂被烧掉,而在原来其占据的位置处产生孔道或孔口。
本发明第二方面涉及一种具有多核共壳结构的微米氧化铈颗
粒的制备方法,其包括以下步骤:
A.使铈盐溶液与沉淀剂反应生成悬浮液,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;其中所述纳米氧化铈前驱体中包含铈的氢氧化物和铈的氧化物;
B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、焙烧,得到纳米氧化铈晶粒核聚集体胚体;
C.将所述纳米氧化铈晶粒核聚集体胚体分散到溶剂中得到悬浮液并向所述悬浮液中加入铈盐溶液和沉淀剂在所述纳米氧化铈晶粒核聚集体周围进行沉积包壳反应,得到第二悬浮液;
D.将所述第二悬浮液进行喷雾干燥、焙烧,得到所述具有多核共壳结构的微米氧化铈颗粒命名为C1。
在优选的实施方案中,在步骤A和步骤B之间增加如下步骤:向所述纳米氧化铈前驱体的液相分散体系中加入有机助剂。其中,所述有机溶剂起到助分散和造孔剂的作用。
在优选的实施方案中,所述有机助剂包括甲基纤维素、淀粉、氨基乙酸、6-氨基己酸、草酸、柠檬酸、聚合度在400-20000范围内的聚乙二醇中的一种或几种。
在优选的实施方案中,所述铈盐包括硝酸铈(III)、醋酸铈(III)或硫酸铈(III);所述铈盐溶液的浓度为0.005mol/L-1mol/L;所述沉淀剂包括氨水、尿素、氢氧化钠或氢氧化钾;独立地,步骤A中在氧化前将所述悬浮液的pH值调至7-11.5;独立地,步骤C中的所述溶剂包括水、无水乙醇、水-乙醇混合体系或水-乙二醇混合体系;独立地,步骤B和/或步骤D中的所述焙烧温度为450-750℃。
本发明第三方面涉及另一种具有多核共壳结构的微米氧化铈颗粒的制备方法,其包括以下步骤:
A.使铈盐溶液与沉淀剂反应生成悬浮液,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;
B.向所述纳米氧化铈前驱体的液相分散体系中加入有机助剂和铈盐溶液,得到分散均匀的液相分散体系;
C.将所述分散均匀的液相分散体系进行喷雾干燥、焙烧,得到具有多核共壳结构的微米氧化铈颗粒。将通过此方法制备的具有多核共壳结构的微米氧化铈颗粒命名为C2。
在优选的实施方案中,所述铈盐包括硝酸铈(III)、醋酸铈(III)或硫酸铈(III);所述铈盐溶液的浓度为0.005mol/L-1mol/L;所述沉淀剂包括氨水、尿素、氢氧化钠或氢氧化钾;独立地,步骤A中在氧化前将所述悬浮液的pH值调至7-11.5;所述有机助剂包括甲基纤维素、淀粉、氨基乙酸、6-氨基己酸、草酸、柠檬酸中、聚合度在400-20000范围内的聚乙二醇的一种或几种;独立地,步骤C中所述焙烧温度为450-750℃。
本发明第四方面涉及另一种具有多核共壳结构的微米氧化铈颗粒的制备方法,其包括以下步骤:
A.使铈盐溶液与沉淀剂反应生成悬浮液,其中所述铈盐溶液和/或沉淀剂中含有有机助剂,且其中所述铈盐相对于沉淀剂来说是化学计量过量的;向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;
B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、焙烧,得到具有多核共壳结构的微米氧化铈颗粒。将通过此方法制备的具有多核共壳结构的微米氧化铈颗粒命名为C3。
在该种制备方法中,过量的铈盐中的铈离子会与有机助剂结合,在喷雾干燥、焙烧过程中形成氧化铈壳层。
在优选的实施方案中,所述铈盐包括硝酸铈(III)、醋酸铈(III)或硫酸铈(III);所述铈盐溶液的浓度为0.005mol/L-1mol/L;所述沉淀剂包括氨水、尿素、氢氧化钠或氢氧化钾;独立地,所述有机助剂包括聚合度在400-20000范围内的聚乙二醇、甲基纤维素、淀粉、氨基乙酸、6-氨基己酸、草酸、柠檬酸中的一种或几种;独立地,步骤A中在氧化前将所述悬浮液的pH值调至8-11.5;独立地,步骤B中所述焙烧温度为450-750℃。
本发明第五方面涉及一种负载型催化剂,该负载型催化剂包括载体和负载于载体上的活性组分,其中:
所述载体为本发明第一方面所述的具有多核共壳结构的微米氧化铈颗粒;
所述活性组分为贵金属或过渡金属纳米颗粒,其分散在所述多个纳米氧化铈晶粒核上和/或所述氧化铈壳层上。
在优选的实施方案中,所述贵金属为Pt或Pd,所述贵金属呈氧化态或单质态,以其中的贵金属质量计算,所述贵金属的负载量为所述具有多核共壳结构的微米氧化铈颗粒质量的0.02-5%;独立地,所述过渡金属为Mn、Fe、CO、Ni或Cu,所述过渡金属呈氧化态,以其中的过渡金属质量计算,所述过渡金属的负载量为所述具有多核共壳结构的微米氧化铈颗粒质量的0.1-20%。
本发明第六方面涉及本发明第五方面所述的负载型催化剂的用途,其中所述负载型催化剂用于催化NO氧化反应、CO氧化反应、汽车尾气三效催化反应或挥发性有机物氧化脱除反应。
本发明的有益效果:
1、本发明的具有多核共壳结构的微米氧化铈颗粒比表面积大,机械强度高且水热稳定性好。
2、以本发明的具有多核共壳结构的微米氧化铈颗粒为载体制备的负载型催化剂具有水热稳定性好、抗硫性好和所负载的贵金属或过渡金属等活性组分在高温水热老化过程中不易被包埋等优点。
图1是本发明具有多核共壳结构的微米氧化铈颗粒的结构示意图。
图2中图2-1和图2-2均为在本发明对比例中制备的没有多核共壳结构的纳米氧化铈聚集体颗粒C-0的扫描电子显微镜(SEM)照片,从中可以看出颗粒表面粗糙,明显呈多孔结构,且微米氧化铈聚集体颗粒表面是由更小的纳米级氧化铈颗粒紧密聚集而成。
图3中图3-1和图3-2均为本发明实施例1制备的具有多核共壳结构的微米氧化铈颗粒C1-1的扫描电子显微镜(SEM)照片,从中可以看出本发明的微米氧化铈颗粒具有球型或类球型结构。
其中图3-2为图3-1中虚线圈出处的部分破损的多核共壳结构的微米氧化铈颗粒的放大图,图3-2可以证明壳层的存在。
图4为本发明实施例1制备的具有多核共壳结构的微米氧化铈颗粒C1-1的X-射线衍射(XRD)图,从图中可以看出该材料为立方萤石结构,所有衍射峰均归属为CeO2的立方萤石结构;根据(111)晶面衍射峰展宽计算CeO2晶粒尺寸约为8.6nm。且证明本发明的具有多核共壳结构的微米氧化铈颗粒的核为晶态。
图5为本发明实施例5制备的具有多核共壳结构的微米氧化铈颗粒C2-1的扫描电子显微镜(SEM)照片。由图5可以看出通过本发明的方法制备的具有多核共壳结构的微米氧化铈颗粒具有相对光滑的表面。
图6为将本发明实施例5制备的具有多核共壳结构的微米氧化铈颗粒C2-1研磨后的扫描电子显微镜(SEM)照片。由图6可以看出具有多核共壳结构的微米氧化铈颗粒研磨后壳层部分破损,可以看到内部纳米氧化铈晶粒核聚集体呈多孔结构。
图7为本发明实施例9制备的具有多核共壳结构的微米氧化铈颗粒C3-1的扫描电子显微镜(SEM)照片。由图7可以看出通过本发明的方法制备的具有多核共壳结构的微米氧化铈颗粒具有相对光滑的表面。
图8为将本发明实施例9制备的具有多核共壳结构的微米氧化铈颗粒C3-1研磨后的扫描电子显微镜(SEM)照片。由图8可以看出具有多核共壳结构的微米氧化铈颗粒研磨后壳层部分破损,可以看到内部纳米氧化铈晶粒核聚集体呈多孔结构。
图9为将本发明实施例9制备的具有多核共壳结构的微米氧化铈颗粒C3-1作为载体负载Pd与在对比例中制备的C-0作为载体负载Pd并将两者经过水热处理后催化含有CO和C3H6的混合气体的催化活性曲线。其中图9-1为气体中CO的转化率曲线,图9-2为气体中C3H6的转化率曲线,图中A表示经过水热处理后的负载型催化剂Pd/C3-1,B表示经过水热处理后的负载型催化剂Pd/C-0。
图10为将本发明实施例9制备的具有多核共壳结构的微米氧化铈颗粒C3-1作为载体负载Pd与在对比例中制备的C-0作为载
体负载Pd并将两者经过硫化处理后催化含有CO和C3H6的混合气体的催化活性曲线。其中图10-1为气体中CO的转化率曲线,图10-2为气体中C3H6的转化率曲线,图中A表示经过硫化处理后的负载型催化剂Pd/C3-1,B表示经过硫化处理后的负载型催化剂Pd/C-0。
图11为将本发明实施例9制备的具有多核共壳结构的微米氧化铈颗粒C3-1作为载体负载Mn与在对比例中制备的C-0作为载体负载Mn并将两者经过水热处理后催化含有NO的气体的催化活性曲线。图中A表示经过水热处理后的负载型催化剂Mn/C3-1,B表示经过水热处理后的负载型催化剂Mn/C-0。
图12为将本发明实施例9制备的具有多核共壳结构的微米氧化铈颗粒C3-1作为载体负载Mn与在对比例中制备的C-0作为载体负载Mn并将两者经过硫化处理后催化含有CO的气体的催化活性曲线。图中A表示经过硫化处理后的负载型催化剂Mn/C3-1,B表示经过硫化处理后的负载型催化剂Mn/C-0。
给出以下实施例以举例说明本发明,这些实施例并非限制性的。
对比例
通过以下步骤制备没有多核共壳结构的纳米氧化铈晶粒聚集体:
A.使0.005mol/L的硝酸铈(III)溶液与氨水反应生成悬浮液,并将悬浮液的pH值调至7,再向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;
B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、在450℃下焙烧,得到纳米氧化铈晶粒聚集体;将通过此方法制备的没有多核共壳结构的纳米氧化铈晶粒聚集体命名为C-0。其中A步骤的制备方法详见参考文献:X.-D.Zhou,W.Huebner,H.U.Anderson,Processing of nanometer-scale CeO2 particles[J],Chemical Materials,2003,15:378-382.通过引用将其并入本文中。
实施例1-4:
通过以下步骤制备具有多核共壳结构的微米氧化铈颗粒C1:
A.使铈盐溶液与沉淀剂反应生成悬浮液,调节所述悬浮液的pH值,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;任选地,向所述纳米氧化铈前驱体的液相分散体系中加入有机助剂;
B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、焙烧,得到纳米氧化铈晶粒核聚集体胚体;
C.将所述纳米氧化铈晶粒核聚集体胚体分散到溶剂中得到悬浮液并向所述悬浮液中加入铈盐溶液和沉淀剂在所述纳米氧化铈晶粒核聚集体周围进行沉积包壳反应,得到第二悬浮液;
D.将所述第二悬浮液进行喷雾干燥、焙烧,得到所述具有多核共壳结构的微米氧化铈颗粒命名为C1。
具体实验情况如表1所示:
表1:实施例1-4的制备条件
实施例5-8
通过以下步骤制备具有多核共壳结构的微米氧化铈颗粒C2:
A.使铈盐溶液与沉淀剂反应生成悬浮液,调节所述悬浮液的pH值,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;
B.向所述纳米氧化铈前驱体的液相分散体系中加入有机助剂和铈盐溶液,得到分散均匀的液相分散体系;
C.将所述分散均匀的液相分散体系进行喷雾干燥、焙烧,得到具有多核共壳结构的微米氧化铈颗粒。将通过此方法制备的具有多核共壳结构的微米氧化铈颗粒命名为C2。
具体实验情况如表2所示:
表2:实施例5-8的制备条件
实施例9-12
通过以下步骤制备具有多核共壳结构的微米氧化铈颗粒C3:
A.使铈盐溶液与沉淀剂反应生成悬浮液,其中所述铈盐溶液和/或沉淀剂中含有有机助剂,且其中所述铈盐相对于沉淀剂来说是化学计量过量的;调节所述悬浮液的pH值,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;
B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、焙烧,得到具有多核共壳结构的微米氧化铈颗粒。将通过此方法制备的具有多核共壳结构的微米氧化铈颗粒命名为C3。
具体实验情况如表3所示:
表3:实施例9-12的制备条件
实施例13
本实施例以C1-1、C2-1、C3-1及对比例C-0的材料为样品,对它们进行了水热稳定性方面的测试,其中“新鲜”表示新制得的样品,“老化”表示水热反应后的样品。水热稳定性测试条件为在750℃、10%H2O的空气气氛中水热老化处理20小时。结果如表4所示:
表4:水热稳定性测试结果
备注:孔体积数据选用氮气等温吸附中最大压力下对应的吸附体积;平均孔径选用BJH算法中脱附值计算;平均晶粒直径选用X射线衍射图样(XRD)中立方萤石结构CeO2(111)晶面衍射峰半峰宽计算,在铜靶XRD中2θ=28.5~28.9°(范围因仪器系统误差导致)。
如表4所示,对于新鲜样品,具有多核共壳结构的样品C1-1、C2-1、C3-1的BET比表面积、孔体积、平均孔径和平均晶粒直径与对比样品C-0相差小于20%。说明多核共壳结构本身对材料的物性参数影响较小。水热老化后所有样品的物理结构参数均发生变化,包括BET比表面积的减少、孔体积的减小、平均孔径的增加及平均晶粒直径的增加。此时所有具有多核共壳结构的样品上物性参数变化幅度均小于C-0样品的变化幅度,BET比表面积降幅从77%降低到46-65%,孔体积降幅从70%降低到40-52%,平均孔径的增幅从40%降低到4-15%,平均晶粒直径增幅从175%降低到63-86%。该结果说明通过本发明的方法制备的样品的多核共壳结构显著提高了样品抵抗水热老化中结构变化的能力,具有较好的水热稳定性。
实施例14
将在实施例9中制备的具有多核共壳结构的微米氧化铈颗粒C3-1和在对比例中制备的没有多核共壳结构的纳米氧化铈晶粒聚集体C-0,分别负载氧化铈材料质量2%的单质态贵金属Pd。将负载了Pd的C3-1和负载了Pd的C-0分别进行水热处理,条件为在750℃、10%H2O的空气气氛中水热老化处理20小时。
水热处理后将负载了Pd的C3-1(简称Pd/C3-1)和负载了Pd的C-0(简称Pd/C-0)分别用于催化含有CO和C3H6混合气体的氧
化反应实验,实验条件为:总反应气氛为1000ppm CO、150ppmC3H6、5%CO2、5%O2、5%H2O、余量为N2;催化剂用量为0.2g、总气体流量1L/min、程序升温速率为10C/min。实验结果如图9所示。可见,在同样温度下,Pd/C3-1催化剂所呈现的CO转化率和C3H6转化率均高于Pd/C-0催化剂。或者说,在相同转化率水平下,Pd/C3-1催化剂所需要的反应温度更低,这有利于延长催化剂寿命。以上实验说明Pd/C3-1催化剂抗水热老化能力强,也说明活性组分不容易被包埋。
实施例15
将在实施例9中制备的具有多核共壳结构的微米氧化铈颗粒C3-1和在对比例中制备的没有多核共壳结构的纳米氧化铈晶粒聚集体C-0,分别负载氧化铈材料质量2%的单质态贵金属Pd。将负载了Pd的C3-1和负载了Pd的C-0分别进行硫化处理,条件为在300℃、40ppm SO2、10%H2O的空气气氛中硫化处理20小时。
硫化处理后将负载了Pd的C3-1和负载了Pd的C-0分别用于催化含有CO和C3H6混合气体的氧化反应实验,实验条件为:总反应气氛为1000ppm CO、150ppm C3H6、5%CO2、5%O2、5%H2O、余量为N2;催化剂用量为0.2g、总气体流量1L/min、程序升温速率为10C/min。实验结果如图10所示。可见,经过同样的硫化处理后,在同样温度下,Pd/C3-1催化剂所呈现的CO转化率和C3H6转化率均高于Pd/C-0催化剂。或者说,在相同转化率水平下,Pd/C3-1催化剂所需要的反应温度更低。这说明Pd/C3-1催化剂的耐硫性更强。
实施例16
将在实施例9中制备的具有多核共壳结构的微米氧化铈颗粒C3-1和在对比例中制备的没有多核共壳结构的纳米氧化铈晶粒聚集体C-0,分别负载氧化铈材料质量2%的氧化态过渡金属Mn(以金属质量百分数计)。将负载了Mn的C3-1和负载了Mn的C-0分别进行水热处理,条件为在750℃、10%H2O的空气气氛中水热老化处理20小时。
水热处理后将负载了Mn的C3-1(简称为Mn/C3-1)和负载了Pd的C-0(简称为Mn/C-0)分别用于催化NO氧化反应实验,实验条件为:总反应气氛为100ppm NO、5%CO2、5%O2、余量
为N2;催化剂用量为0.2g、总气体流量1L/min、程序升温速率为10C/min。实验结果如图11所示。可见,在同样温度下,Mn/C3-1催化剂所呈现的NO转化率高于Mn/C-0催化剂。或者说,在相同转化率水平下,Mn/C3-1催化剂所需要的反应温度更低,这有利于延长催化剂寿命。以上实验说明Mn/C3-1催化剂抗水热老化能力强,也说明活性组分不容易被包埋。
实施例17
将在实施例9中制备的具有多核共壳结构的微米氧化铈颗粒C3-1和在对比例中制备的没有多核共壳结构的纳米氧化铈晶粒聚集体C-0,分别负载氧化铈材料质量2%的氧化态过渡金属Mn(以金属质量百分数计)。将负载了Mn的C3-1和负载了Mn的C-0分别进行硫化处理,条件为在300℃、40ppm SO2、10%H2O的空气气氛中硫化处理20小时。
硫化处理后将负载了Mn的C3-1和负载了Mn的C-0分别用于催化含有CO气体的氧化反应实验,实验条件为:总反应气氛为1000ppm CO、5%CO2、5%O2、5%H2O、余量为N2;催化剂用量为0.2g、总气体流量1L/min、程序升温速率为10C/min。实验结果如图12所示。可见,经过同样的硫化处理后,在同样温度下,Mn/C3-1催化剂所呈现的CO转化率高于Mn/C-0催化剂。或者说,在相同转化率水平下,Mn/C3-1催化剂所需要的反应温度更低。这说明Mn/C3-1催化剂的耐硫性更强。
由实施例14和16可以看出,本发明制备的具有多核共壳结构的微米氧化铈颗粒与传统的无壳氧化铈相比,在负载贵金属或过渡金属制备成功能催化剂后,具有明显优越的抗水热老化能力。在750℃、10%H2O的空气气氛中水热老化处理20小时后,本发明所涉及的催化剂的活性明显优于常规的(无壳)催化剂。
由实施例15和17可以看出,本发明制备的具有多核共壳结构的微米氧化铈颗粒与传统的无壳氧化铈相比,在负载贵金属或过渡金属制备成功能催化剂后,具有明显优越的抗硫中毒能力,在300℃、40ppm SO2、10%H2O的空气气氛中硫化处理20小时后,本发明所涉及的催化剂活性明显优于常规的(无壳)催化剂。
Claims (10)
- 一种具有多核共壳结构的微米氧化铈颗粒,其特征在于,所述微米氧化铈颗粒包括:氧化铈壳层,该壳层由晶态和/或非晶态纳米氧化铈颗粒构成;和位于所述壳层内部的多个纳米氧化铈晶粒核聚集体。
- 根据权利要求1所述的具有多核共壳结构的微米氧化铈颗粒,其特征在于,所述微米氧化铈颗粒为球型或类球形颗粒,平均粒径为0.5μm-50μm,BET比表面积为50-200m2/g;其中所述壳层内部的多个纳米氧化铈晶粒核聚集体的质量占所述微米氧化铈颗粒总质量的99-85%,所述氧化铈壳层的质量占所述微米氧化铈颗粒总质量的1-15%,所述氧化铈壳层的厚度为10-200nm;所述纳米氧化铈晶粒的平均粒径为2-50nm,所述氧化铈壳层中的晶态和/或非晶态纳米氧化铈颗粒的平均粒径为2-50nm。
- 一种具有多核共壳结构的微米氧化铈颗粒的制备方法,其包括以下步骤:A.使铈盐溶液与沉淀剂反应生成悬浮液,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、焙烧,得到纳米氧化铈晶粒核聚集体胚体;C.将所述纳米氧化铈晶粒核聚集体胚体分散到溶剂中得到悬浮液并向所述悬浮液中加入铈盐溶液和沉淀剂在所述纳米氧化铈晶粒核聚集体周围进行沉积包壳反应,得到第二悬浮液;D.将所述第二悬浮液进行喷雾干燥、焙烧,得到所述具有多核共壳结构的微米氧化铈颗粒。
- 根据权利要求3所述的制备方法,其特征在于,在步骤A和步骤B之间增加如下步骤:向所述纳米氧化铈前驱体的液相分散体系中加入有机助剂。
- 根据权利要求4所述的制备方法,其特征在于,所述有机助剂包括甲基纤维素、淀粉、氨基乙酸、6-氨基己酸、草酸、柠檬酸、聚合度在400-20000范围内的聚乙二醇中的一种或几种。
- 根据权利要求3-5中的任一项所述的制备方法,其特征在于,所述铈盐包括硝酸铈(III)、醋酸铈(III)或硫酸铈(III);所述铈盐溶液的浓度为0.005mol/L-1mol/L;所述沉淀剂包括氨水、尿素、氢氧化钠或氢氧化钾;独立地,步骤A中在氧化前将所述悬浮液的pH值调至7-11.5;独立地,步骤C中的所述溶剂包括水、无水乙醇、水-乙醇混合体系或水-乙二醇混合体系;独立地,步骤B和/或步骤D中的所述焙烧温度为450-750℃。
- 一种具有多核共壳结构的微米氧化铈颗粒的制备方法,其包括以下步骤:A.使铈盐溶液与沉淀剂反应生成悬浮液,向生成的悬浮液中通入空气进行氧化,得到纳米氧化铈前驱体的液相分散体系;B.向所述纳米氧化铈前驱体的液相分散体系中加入有机助剂和铈盐溶液,得到分散均匀的液相分散体系;C.将所述分散均匀的液相分散体系进行喷雾干燥、焙烧,得到具有多核共壳结构的微米氧化铈颗粒。
- 根据权利要求7所述的制备方法,其特征在于,所述铈盐包括硝酸铈(III)、醋酸铈(III)或硫酸铈(III);所述铈盐溶液的浓度为0.005mol/L-1mol/L;所述沉淀剂包括氨水、尿素、氢氧化钠或氢氧化钾;独立地,步骤A中在氧化前将所述悬浮液的pH值调至7-11.5;所述有机助剂包括甲基纤维素、淀粉、氨基乙酸、6-氨基己酸、草酸、柠檬酸、聚合度在400-20000范围内的聚乙二醇中的一种或几种;独立地,步骤C中所述焙烧温度为450-750℃。
- 一种具有多核共壳结构的微米氧化铈颗粒的制备方法,其包括以下步骤:A.使铈盐溶液与沉淀剂反应生成悬浮液,其中所述铈盐溶液和/或沉淀剂中含有有机助剂,且其中所述铈盐相对于沉淀剂来说是化学计量过量的;向生成的悬浮液中通入空气进行氧化,得到纳米 氧化铈前驱体的液相分散体系;B.将所述纳米氧化铈前驱体的液相分散体系进行喷雾干燥、焙烧,得到具有多核共壳结构的微米氧化铈颗粒。
- 根据权利要求9所述的制备方法,其特征在于,所述铈盐包括硝酸铈(III)、醋酸铈(III)或硫酸铈(III);所述铈盐溶液的浓度为0.005mol/L-1mol/L;所述沉淀剂包括氨水、尿素、氢氧化钠或氢氧化钾;独立地,所述有机助剂包括甲基纤维素、淀粉、氨基乙酸、6-氨基己酸、草酸、柠檬酸、聚合度在400-20000范围内的聚乙二醇中的一种或几种;独立地,步骤A中在氧化前将所述悬浮液的pH值调至7-11.5;独立地,步骤B中所述焙烧温度为450-750℃。
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