CN109647404A - yolk/shell型催化剂及其制备方法与催化产氢应用 - Google Patents
yolk/shell型催化剂及其制备方法与催化产氢应用 Download PDFInfo
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- 210000002969 egg yolk Anatomy 0.000 title claims abstract description 82
- 239000003054 catalyst Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 239000001257 hydrogen Substances 0.000 title claims abstract description 14
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 14
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 12
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000001291 vacuum drying Methods 0.000 claims description 21
- 238000004090 dissolution Methods 0.000 claims description 20
- 239000013049 sediment Substances 0.000 claims description 19
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 14
- 230000001376 precipitating effect Effects 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- 229910001868 water Inorganic materials 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 10
- 238000000643 oven drying Methods 0.000 claims description 10
- 239000001509 sodium citrate Substances 0.000 claims description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 229910000085 borane Inorganic materials 0.000 claims description 2
- UORVGPXVDQYIDP-UHFFFAOYSA-N trihydridoboron Substances B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 claims description 2
- 229910021592 Copper(II) chloride Inorganic materials 0.000 claims 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 235000010299 hexamethylene tetramine Nutrition 0.000 abstract description 5
- 239000004312 hexamethylene tetramine Substances 0.000 abstract description 5
- 239000007787 solid Substances 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- JBANFLSTOJPTFW-UHFFFAOYSA-N azane;boron Chemical compound [B].N JBANFLSTOJPTFW-UHFFFAOYSA-N 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 230000007062 hydrolysis Effects 0.000 abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 2
- 150000001868 cobalt Chemical class 0.000 abstract description 2
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 2
- 239000004005 microsphere Substances 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 57
- 238000012360 testing method Methods 0.000 description 22
- 239000011258 core-shell material Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 230000002045 lasting effect Effects 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-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
- 239000000084 colloidal system Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 229910016507 CuCo Inorganic materials 0.000 description 1
- 229910016506 CuCo2O4 Inorganic materials 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 229910003203 NH3BH3 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- -1 metal oxide compounds Chemical class 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010792 warming 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
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
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Abstract
本发明涉及催化剂技术领域,公开了一种yolk/shell型催化剂及其制备方法与催化产氢应用。所述yolk/shell型催化剂的制备方法是以六次甲基四胺为碱源,应用水热合成法利用钴盐与六次甲基四胺成功合成了[Co(C6H12N4)2](NO3)2实心球体络合物,继而通过煅烧的方法得到yolk/shell型Co3O4微球结构,并通过物理吸附的方式在表面吸附Cu2+,再次经过煅烧形成yolk/shell型CoxCu1‑xCo2O4@CoyCu1‑yCo2O4。所述制备方法简单、原料价廉易得,制备出的yolk/shell型CoxCu1‑xCo2O4@CoyCu1‑yCo2O4催化剂纯度高,催化性能好,在催化氨硼烷水解产氢方面能够表现出优越的催化活性。
Description
技术领域
本发明涉及催化剂技术领域,更具体地,涉及yolk/shell型催化剂及其制备方法与催化产氢应用。
背景技术
通过近几年的探索发现,对催化剂颗粒在纳米尺度上进行结构的设计和调控,很可能会显著改变其物理性质和化学性质,以期望得到活性更高的催化剂。其中核壳型结构(记做“核 @壳”)由于具备特殊的表面性质和电子结构而引起了研究者的极大兴趣,该结构由于有了壳层的保护,核的稳定性也得到了保障,相应地提升了催化剂的使用寿命;同时,通过对内核与壳层的元素种类、物质形态等方面的调控,从而使催化剂的形式多样,在催化等领域的应用日益受到重视。
Yolk/shell型核壳结构是一种独特的核壳结构,它是核与壳之间有空腔且核能移动的一类核壳结构材料。近年来,制备Yolk/shell型核壳结构的方法报道很多,一般包括:刻蚀法、模板法、Kirkendall效应等。早在2003年,Kaori Kamata等人(Synthesis andCharacterization of Monodispersed Core-Shell Spherical Colloids with MovableCores,J.Am.Chem.Soc.,2003, 125,2384-2385)首次利用刻蚀法合成yolk/shell结构的材料,但在制备过程中刻蚀环节使得制备工艺复杂,而且用到剧毒氢氟酸,其具有较强的腐蚀性,对于实验操作有一定危险性。 Tierui Zhang等人(Formation of Hollow SilicaColloids through a Spontaneous Dissolution– Regrowth Process,Angew.Chem.2008,120,5890-5895)利用硅壳的自发生长,并用NaBH4溶液处理壳型结构而得到yolk/shell结构;CM Cui等人(Facile One-Pot Synthesis of Multi- Yolk-Shell Bi@CNanostructures by the Nanoscale Kirkendall Effect,Chem.Commun.2015,51 (45),9276-9279)利用Kirkendall效应合成了新型Bi@C多层yolk/shell纳米结构,但凭借扩散而形成的中空纳米颗粒,导致了核壳厚度不可控。
发明内容
本发明旨在克服上述现有技术的至少一种不足,提供一种yolk/shell型 CoxCu1- xCo2O4@CoyCu1-yCo2O4(0<x<1,0<y<1)催化剂的制备方法,该制备方法简单可控,原料价廉易得,通过煅烧而形成yolk/shell型金属氧化物复合物能够充分发挥金属间的协同效应。
本发明的另一目的在于提供利用所述制备方法制备得到的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂。
本发明采取的技术方案如下:
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的制备方法,包括如下步骤:
步骤S1、取3~4.5mmol Co(NO3)2·6H2O、1.5~2.25mmol C6H12N4、1~1.5mmolNa3C6H5O7·2H2O溶于30~50mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至反应釜,80~160℃反应8~24h;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40~60℃烘干;
步骤S4、将所得样品在200~400℃煅烧1~4h,得到yolk/shell型Co3O4;
步骤S5、取0.05~0.1g Co3O4、0.375~1.5mmol铜盐、0.1875~0.75mmol C7H5NaO3溶于15~25mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液在80~120℃冷凝回流6~12h,收集沉淀,洗涤,真空烘箱40~60℃烘干得到样品;
步骤S7、将样品在300~500℃煅烧2~5h,得到yolk/shell型CoxCu1-xCo2O4@
CoyCu1-yCo2O4。
本发明首先以六次甲基四胺为碱源,应用水热合成法利用钴盐与六次甲基四胺成功合 [Co(C6H12N4)2](NO3)2实心球体络合物,继而通过煅烧的方法得到yolk/shell型Co3O4,并通过物理吸附的方式在表面吸附Cu2+,再经煅烧形成yolk/shell型CoxCu1-xCo2O4@CoyCu1- yCo2O4。在煅烧过程中,由于热量由外向内传递,六次甲基四胺在空气氛围煅烧过程中形成的NH3、 HCHO气体从中逃逸而形成空腔,该种制备Yolk/shell型核壳结构的方法简易,而后选用的是通过冷凝回流的方式进行热吸附,集加热搅拌于一体,优于大部分文献报道的在反应釜中实现包覆,搅拌使得反应接触的更加充分,反应的更加彻底,且最终样品仍然保持了Yolk/shell 型核壳结构。此外,热吸附属于物理吸附,能保证反应后物质的纯度,这点有别于化学包覆,化学包覆需要加沉淀剂,这就导致了在形成包覆的同时,也不能排除沉淀剂与吸附粒子之间的相互作用,从而形成杂质。
在其中一个实施例中,所述步骤S4为:将所得样品以2~10℃/min的升温速率从室温升温至200~400℃煅烧,持续1~4h,得到yolk/shell型Co3O4。升温的作用是促使化学反应发生,使得[Co(C6H12N4)2](NO3)2分解生成Co3O4。
在其中一个实施例中,步骤S5所述铜盐为CuCl2。
在其中一个实施例中,所述步骤S6为:将步骤S5所得溶液转移至单口烧瓶中,再置于油浴锅,80~120℃冷凝回流6~12h,收集沉淀,洗涤1~5次后,真空烘箱40~60℃烘干得到样品。
在其中一个实施例中,所述步骤S7为:将样品以1~3℃/min的升温速率从室温升温至300~500℃,持续煅烧2~5h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。持续升温能够促使化学反应发生,使得表面吸附的铜离子变成氧化铜进入Co3O4晶格。
所述的制备方法中步骤S3制备得到的[Co(C6H12N4)2](NO3)2沉淀物。
所述的制备方法制备得到的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂。
所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂在催化氨硼烷水解制产氢中的应用。本发明所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂在催化氨硼烷水解产氢方面能够表现出优越的催化活性。
与现有技术相比,本发明的有益效果为:本发明制备yolk/shell型 CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的过程中使用物理吸附方式,保证了反应产物的纯度;本发明制备所述yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的工艺简单、原料价廉易得、操作安全系数高,且核壳结构较易控制;本发明所制备出的yolk/shell型 CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂催化活性高,具有较好的有应用价值,在催化氨硼烷水解产氢方面能够表现出优越的催化性能;本发明所述的制备方法对其他金属系统的多活性金属氧化物纳米/微米催化剂也就有参考意义。
附图说明
图1为实施例1所述的[Co(C6H12N4)2](NO3)2沉淀物的综合测试图。
图2为实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的SEM图。
图3为实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的TEM图。
图4为实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的XRD图。
图5为实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的 EDS-Mapping测试图。
图6为实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的元素含量随着样品深度的变化关系图。
图7为实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的催化产氢测试曲线。
具体实施方式
为使本发明的目的、技术方案及优点更加清楚明白,以下结合具体实施方式,对本发明进行进一步的详细说明。应当理解的是,此处所描述的具体实施方式仅用以解释本发明,并不限定本发明的保护范围。
实施例1
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4.5mmol Co(NO3)2·6H2O、2.25mmol C6H12N4、1.5mmol Na3C6H5O7·2H2O 溶于35mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,100℃反应24h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以10℃/min的升温速率从室温升温至200℃,持续煅烧3h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、1.5mmol CuCl2、0.75mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在90℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧3h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例2
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取3mmol Co(NO3)2·6H2O、1.5mmol C6H12N4、1mmol Na3C6H5O7·2H2O溶于 30mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,100℃反应24h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以10℃/min的升温速率从室温升温至200℃,持续煅烧3h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、1.5mmol CuCl2、0.75mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在90℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧3h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例3
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4mmol Co(NO3)2·6H2O、2mmol C6H12N4、1.33mmol Na3C6H5O7·2H2O溶于 50mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,100℃反应24h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以10℃/min的升温速率从室温升温至200℃,持续煅烧3h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、1.5mmol CuCl2、0.75mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在90℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧3h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例4
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4.5mmol Co(NO3)2·6H2O、2.25mmol C6H12N4、1.5mmol Na3C6H5O7·2H2O 溶于35mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,160℃反应8h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱60℃烘干;
步骤S4、将所得样品在马弗炉中以5℃/min的升温速率从室温升温至300℃,持续煅烧3h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、1.5mmol CuCl2、0.75mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在120℃冷凝回流6h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以1℃/min的升温速率从室温升温至500℃,持续煅烧2h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例5
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4.5mmol Co(NO3)2·6H2O、2.25mmol C6H12N4、1.5mmol Na3C6H5O7·2H2O 溶于35mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,120℃反应20h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧1h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、1.5mmol CuCl2、0.75mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在80℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱60℃烘干得到样品;
步骤S7、将样品在马弗炉中以3℃/min的升温速率从室温升温至300℃,持续煅烧5h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例6
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4.5mmol Co(NO3)2·6H2O、2.25mmol C6H12N4、1.5mmol Na3C6H5O7·2H2O 溶于35mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,100℃反应24h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以10℃/min的升温速率从室温升温至200℃,持续煅烧得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、0.5mmol CuCl2、0.25mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在90℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧3h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例7
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4.5mmol Co(NO3)2·6H2O、2.25mmol C6H12N4、1.5mmol Na3C6H5O7·2H2O 溶于35mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,100℃反应24h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以10℃/min的升温速率从室温升温至200℃,持续煅烧3h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.05g Co3O4、0.375mmol CuCl2、0.1875mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在90℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧3h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
实施例8
一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂,其制备过程如下:
步骤S1、取4.5mmol Co(NO3)2·6H2O、2.25mmol C6H12N4、1.5mmol Na3C6H5O7·2H2O 溶于35mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至100mL反应釜,100℃反应24h,反应结束后冷却至室温;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40℃烘干;
步骤S4、将所得样品在马弗炉中以10℃/min的升温速率从室温升温至200℃,持续煅烧3h,得到yolk/shell型Co3O4,冷却至室温;
步骤S5、取0.1g Co3O4、0.75mmol CuCl2、0.375mmol C7H5NaO3溶于20mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液转移至100mL单口烧瓶,再置于油浴锅,在90℃冷凝回流12h,收集沉淀,洗涤3次,真空烘箱40℃烘干得到样品;
步骤S7、将样品在马弗炉中以2℃/min的升温速率从室温升温至400℃,持续煅烧3h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
对实施例1至8所制备的[Co(C6H12N4)2](NO3)2沉淀物和yolk/shell型 CoxCu1- xCo2O4@CoyCu1-yCo2O4催化剂进行分析测试,包括SEM测试分析、TEM测试分析、XRD测试分析以及FTIR测试分析。
图1中a、b、c、d分别为实施例1中[Co(C6H12N4)2](NO3)2沉淀物的XRD测试图、FTIR测试图、SEM测试图和TEM测试图。从SEM测试扫描图中看出,制备出的 [Co(C6H12N4)2](NO3)2沉淀物外貌为球形结构,从TEM测试投射电镜图可以看出,制备出的 [Co(C6H12N4)2](NO3)2沉淀物呈直径约为2um实心球体。从XRD测试可以看出,制备出的 [Co(C6H12N4)2](NO3)2沉淀物在XRD谱图中并没有出峰,表明得到的[Co(C6H12N4)2](NO3)2是无定型固体。从FTIR测试可以看出,红外谱图上可以看到在1387cm-1出现了NO3 -的特征峰,在1235cm-1、1543cm-1出现了C-N伸缩振动峰,表明得到了目标产物[Co(C6H12N4)2](NO3)2沉淀物。对于[Co(C6H12N4)2](NO3)2沉淀物的具体红外分析见表1。
表1
Label | Position(cm<sup>-1</sup>) | Assignment | species |
a | 672 | CNC | C<sub>6</sub>H<sub>12</sub>N<sub>4</sub> |
b | 823 | C-H | C<sub>6</sub>H<sub>12</sub>N<sub>4</sub> |
c | 1235 | C-N | C<sub>6</sub>H<sub>12</sub>N<sub>4</sub> |
d | 1387 | C-H、NO<sub>3</sub><sup>-</sup> | C<sub>6</sub>H<sub>12</sub>N<sub>4</sub>,Co(NO<sub>3</sub>)<sub>2</sub> |
e | 1543 | C-N | C<sub>6</sub>H<sub>12</sub>N<sub>4</sub> |
f | 3395 | O-H | H<sub>2</sub>O |
对于yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4,从SEM测试扫描图中看出,合成的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4形貌呈直径约为5um的微球,从破损结构可得出制备的球体为空心球体。如图2所示为实施例1所述的yolk/shell型 CoxCu1-xCo2O4@CoyCu1- yCo2O4催化剂的SEM图。
从TEM测试扫描图也可以看出,合成的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4形貌呈直径约为5um的微球。如图3所示为实施例1所述的yolk/shell型 CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的TEM图。
从XRD测试可以看出,合成的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4的特征峰与Co3O4和CuCo2O4标准卡片一一对应,表明得到了目标产物yolk/shell型 CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂。如图4所示为实施例1所述的yolk/shell型 CoxCu1-xCo2O4@CoyCu1-yO催化剂的XRD图。
对实施例1-8所制备的CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂单个球体进行EDS测试,从EDS测试可知,铜、钴、氧三种元素均匀地分布在球中,表明球体是CuCo2O4和Co3O4的复合物,故本发明可简单地将这种复合物表示为CoxCu1-xCo2O4,如图5为实施例1所述的 CoxCu1- xCo2O4@CoyCu1-yCo2O4催化剂单个球体的EDS-Mapping测试图。对实施例1-8所制备的CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂进行XPS测试,从XPS测试可知,随着样品深度的增加,钴的含量上升、铜的含量下降,表明yolk和shell的组成不一样,故所得产物可用 CoxCu1- xCo2O4@CoyCu1-yCo2O4表示,如图6为实施例1所述的CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的元素含量随着样品深度的变化关系图。
对实施例1至8所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂进行催化产氢性能测试分析,NH3BH3用量为3mmol,NaOH用量为20mmol,yolk/shell型 CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂用量为10mg。测得25℃下 CoxCu1-xCo2O4@CoyCu1-yCo2O4作为催化剂每分钟产氢60~80mL。如图7为实施例1所述的 yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的催化产氢测试曲线,从图7可知,实施例1所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂每分钟产氢约为75mL。
以上所述实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (8)
1.一种yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂的制备方法,其特征在于,包括如下步骤:
步骤S1、取3~4.5mmol Co(NO3)2·6H2O、1.5~2.25mmol C6H12N4、1~1.5mmolNa3C6H5O7·2H2O溶于30~50mL水中,持续搅拌直至溶解得到混合液;
步骤S2、将上述混合液移至反应釜,80~160℃反应8~24h;
步骤S3、抽滤水洗,得到中间体[Co(C6H12N4)2](NO3)2沉淀物,真空烘箱40~60℃烘干;
步骤S4、将所得样品在200~400℃煅烧1~4h,得到yolk/shell型Co3O4;
步骤S5、取0.05~0.1g Co3O4、0.375~1.5mmol铜盐、0.1875~0.75mmol C7H5NaO3溶于15~25mL去离子水中,持续搅拌直至溶解;
步骤S6、将步骤S5所得溶液在80~120℃冷凝回流6~12h,收集沉淀,洗涤,真空烘箱40~60℃烘干得到样品;
步骤S7、将样品在300~500℃煅烧2~5h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1- yCo2O4。
2.根据权利要求1所述的制备方法,其特征在于,所述步骤S4为:将所得样品以2~10℃/min的升温速率从室温升温至200~400℃,持续煅烧1~4h,得到yolk/shell型Co3O4。
3.根据权利要求1所述的制备方法,其特征在于,步骤S5所述铜盐为CuCl2。
4.根据权利要求1所述的制备方法,其特征在于,所述步骤S6为:将步骤S5所得溶液转移至单口烧瓶中,再置于油浴锅,80~120℃冷凝回流6~12h,收集沉淀,洗涤1~5次后,真空烘箱40~60℃烘干得到样品。
5.根据权利要求1所述的制备方法,其特征在于,所述步骤S7为:将样品以1~3℃/min的升温速率从室温升温至300~500℃,持续煅烧2~5h,得到yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4。
6.权利要求1-5任一权利要求所述的制备方法中步骤S3制备得到的[Co(C6H12N4)2](NO3)2沉淀物。
7.权利要求1-5任一权利要求所述的制备方法制备得到的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂。
8.权利要求6所述的yolk/shell型CoxCu1-xCo2O4@CoyCu1-yCo2O4催化剂在催化氨硼烷水解产氢中的应用。
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