CN111468151A - 一种具有片层结构Mo2C助催化剂及制备和应用 - Google Patents
一种具有片层结构Mo2C助催化剂及制备和应用 Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000001257 hydrogen Substances 0.000 claims abstract description 22
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000001699 photocatalysis Effects 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011941 photocatalyst Substances 0.000 claims abstract description 10
- 239000002243 precursor Substances 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims abstract description 7
- FJLUATLTXUNBOT-UHFFFAOYSA-N 1-Hexadecylamine Chemical compound CCCCCCCCCCCCCCCCN FJLUATLTXUNBOT-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000003763 carbonization Methods 0.000 claims abstract description 5
- 238000010000 carbonizing Methods 0.000 claims abstract description 5
- 239000004065 semiconductor Substances 0.000 claims abstract description 5
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 4
- 238000009396 hybridization Methods 0.000 claims abstract description 3
- 238000007146 photocatalysis Methods 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000002161 passivation Methods 0.000 claims abstract 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 6
- -1 ammonium heptamolybdate tetrahydrate Chemical class 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
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- 229910052786 argon Inorganic materials 0.000 claims description 2
- JDMJOWWQRDWAAG-UHFFFAOYSA-N ethanol;hexadecan-1-amine Chemical compound CCO.CCCCCCCCCCCCCCCCN JDMJOWWQRDWAAG-UHFFFAOYSA-N 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 238000000967 suction filtration Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 229910021423 nanocrystalline silicon Inorganic materials 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 8
- 230000003197 catalytic effect Effects 0.000 description 7
- 239000002131 composite material Substances 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 5
- 229910000510 noble metal Inorganic materials 0.000 description 5
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 4
- 229910003178 Mo2C Inorganic materials 0.000 description 4
- 229910039444 MoC Inorganic materials 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
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- 150000001412 amines Chemical class 0.000 description 2
- XIEPJMXMMWZAAV-UHFFFAOYSA-N cadmium nitrate Inorganic materials [Cd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XIEPJMXMMWZAAV-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- NMHMNPHRMNGLLB-UHFFFAOYSA-N phloretic acid Chemical compound OC(=O)CCC1=CC=C(O)C=C1 NMHMNPHRMNGLLB-UHFFFAOYSA-N 0.000 description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种具有片层结构Mo2C助催化剂的制备及应用。该催化剂以十六胺为碳源,经有机无机杂化法形成前驱体,并经压片高温碳化后制得。该Mo2C可用于光催化制氢中作为产氢助催化剂,助催化性能优异。具有片层结构Mo2C的制备过程及应用如下:(1)以十六胺为碳源,以(NH4)6Mo7O24·4H2O为钼源,通过有机无机杂化法制得前驱体;(2)将制得的前驱体进行压片、高温碳化、钝化后即可制得;(3)将该具有片层结构的Mo2C与CdS半导体光催化剂复合,可用于光催化分解水制氢。本发明中所述的片状Mo2C的制备路线简单,合成原料相对廉价,且具有大的比表面积,可应用于光催化、光电催化、热催化等领域。
Description
技术领域
本发明涉及一种具有片层结构Mo2C助催化剂的制备及其在光催化产氢中的应用。
背景技术
能源问题是伴随人类社会发展、工业化进程而产生的时代之问,传统化石能源使用所引起的环境问题已经日趋严重,人们对于新型,可持续发展,环保,高效新能源的需求愈发迫切。氢能,以其高的燃烧值,燃烧产物是水等特点备受青睐,然而,现阶段的氢气大多来源于煤、石油、天然气等传统的化石能源,对环境的影响不言而喻,利用太阳能光催化产氢为解决这一问题提供了一条有效的途径。但是在太阳能光催化产氢中仍存在太阳能到氢能转化效率低等问题,其中光生电荷的分离是决定转化效率的关键所在。担载合适的助催化剂可以有效地解决这一问题,传统贵金属产氢助催化剂如Pt虽然具有较高的功函数、催化质子还原产氢能力强,但由于其高昂的价格限制了其工业化的应用。因此开发廉价的,具有高助催化活性的非贵金属助催化剂具有极其重要的意义。
Mo2C因其具有极高的热稳定性、在室温下耐腐蚀、催化活性高等特点,已经被广泛地应用于热催化、电催化和光电催化之中。传统的商业Mo2C均是采用甲烷气/氢气直接碳化三氧化钼而制得,这种方法制备的碳化钼比表面积小,微观形貌为块状,催化位点少,限制了Mo2C的整体催化效果。因此我们采取有机无机杂化法,以有机胺为碳源,通过原位碳化法制备具有大比表面积的具有片层结构的Mo2C,以此来提升催化效果。
发明内容
本发明的目的是改进传统商业碳化钼制备比表面积低,催化活性相对较低等劣势,来制备一种具有大比表面积、催化位点多的Mo2C非贵金属产氢助催化剂,并将其作为助催化剂与CdS复合应用于光催化分解水产氢领域。
本发明的技术方案:
为实现上述目的,本发明采用如下技术方案:
一种具有片层结构的Mo2C助催化剂的制备方法,具体步骤如下:
(1)0.04g/mL~0.1g/mL四水合七钼酸铵的水溶液逐滴加入到0.025g/mL~0.05g/mL十六胺的乙醇溶液中,并以一定量的1mol/L~2mol/L盐酸调节pH,调节pH的范围为1~8;
(2)滴毕,将(1)中的容器转移至40~70℃水浴环境中加热3~8h,随后将沉淀抽滤,用乙醇和去离子水洗涤3~5次,90~120℃下真空干燥;
(3)将(2)中干燥好的前驱体研磨后称取0.5~2g压片,优选1g~1.5g,压片机的压力范围在20MPa~50MPa,优选25MPa~35MPa。
(4)在氩气、氦气或者氮气等保护气存在的条件下,气体流量为20ml/min~100ml/min,优选40ml/min~60ml/min;于管式炉中碳化,管式炉的温度在900℃~1000℃,优选950℃~970℃,再经99:1的N2:O2钝化气钝化6h~24h,优选10h~12h,得到具有片层结构,且具有大比表面积的Mo2C,在pH=1条件下所制备Mo2C的比表面积达到132m2/g。
本发明的显著优点在于:
以十六胺为有机碳源,通过原位碳化制备了具有大比表面积,片层结构的Mo2C,制备过程简单,条件温和,原材料价格相对低廉,可进行大规模推广,可以与CdS等半导体光催化剂一起制备复合型产氢光催化剂,也可以应用于电催化、热催化等领域。
附图说明
图1不同pH条件下制备的Mo2C的XRD图。
图2pH=1下制备的Mo2C的扫描电镜图。
图3不同Mo2C担载量的光催化活性图。
图4CdS担载不同助催化剂光催化活性图。
图5不同温度下制备的Mo2C的XRD图。
图6pH=1下以苯胺为碳源制备的Mo2C的扫描电镜图。
具体实施方式
下面通过具体的实施例对本发明作进一步详细说明。
实施例1一种具有片层结构Mo2C助催化剂的制备方法,步骤如下:
(1)量取100mL 0.03g/mL的十六胺的乙醇溶液置于500mL的烧杯之中,再量取100mL0.06g/mL的四水合七钼酸铵水溶液,这一过程中要保持充分搅拌,搅速为600rpm/min,以3mL/min的滴速直至滴加完毕;滴加1mol/L的盐酸调节pH至1,将烧杯转移至60℃的水浴锅中水浴5h;抽滤,用300mL的乙醇和去离子水各依次洗涤3次。
(2)105℃真空干燥24h,取出并研磨成粉末状,称取1g前驱体,在30MPa的压力下压片,保持30分钟,随后将片置于石英舟中,在氮气氛围中,50ml/min的流速下,970℃煅烧12h,自然冷却至室温,用体积比99:1的N2:O2钝化12h。
(3)分别配置0.14M的硝酸镉水溶液和0.14M的硫化钠水溶液。
(4)称取0.05g(2)中钝化的Mo2C,在搅拌条加下加入到50mL 0.14M的硝酸镉水溶液,搅拌2h后,逐滴加入60mL 0.14M的硫化钠水溶液,滴加完毕后继续搅拌2h,陈化12h,用300mL的乙醇和去离子水各依次洗涤3次,转移至真空干燥箱干燥12h,得到Mo2C-h1/CdS复合产氢助催化剂。
(5)光催化分解水产氢反应:将0.1g复合光催化剂加入到100mL体积分数为10%的乳酸溶液,用300W氙灯模拟太阳光源,电流为15mA,光照时间为1h。
(6)同时用质量担载量最优的1%Pt/CdS和商业化碳化钼质量担载量5%Mo2C-c/CdS复合产氢助催化剂采用步骤(5)相同条件进行了对比。
实施例2:
Mo2C的制备参考实施例1,不同之处在于步骤(1)中加入盐酸调节pH为4,所制得的复合光催化剂标记为Mo2C-h4/CdS,其余步骤与实施例1步骤(1)-(5)相同。
实施例3:
Mo2C的制备参考实施例1,不同之处在于不加入盐酸调节pH,所制得的复合光催化剂标记为Mo2C-h8/CdS,其余步骤与实施例1步骤(1)-(5)相同。
图1是实施例1-3于不同pH条件下制备的Mo2C的XRD图(在pH=8,4,1条件下制备的Mo2C分别标记为Mo2C-h8,Mo2C-h4和Mo2C-h1)。在图中可以看出,所制备的Mo2C与标卡PDF#35-0787一致(jade软件标卡),说明成功的合成了β型的Mo2C,从XRD图中可以看出,在低的pH条件下所制备的Mo2C的衍射峰强度更强,结晶度更高。
图2是实施例1在pH=1条件下制备的Mo2C的扫描电镜图。可以看出,所制备的Mo2C的微观形貌具有由紧密堆叠的片层结构,单层片的厚度在10~20nm,片层之间的距离为5~50nm,比表面积达到132m2/g。
图3是实施例1在pH=1条件下制备的Mo2C不同担载量的活性图。可以看出,在5wt%Mo2C的担载量下的复合光催化剂的活性最高,达到了3200μmol/h/g,是单独CdS的10.7倍,单独的Mo2C是没有光催化活性的。
图4是CdS担载不同助催化剂的光催化活性图,可以看出,无论是担载了商业Mo2C(Mo2C-c)的CdS还是以十六胺为碳源制备的具有片层结构的Mo2C,其助催化性能都优于Pt,其中Mo2C-h1的助催化性能是Pt的3.8倍,是商业Mo2C的2.0倍。
对比例1:
催化剂的制备参考实施例1,不同之处在于步骤(2)的煅烧温度为650℃,其余步骤与实施例1相同。从图5中可以看出,在650℃下制备的碳化钼为α-Mo2C。
对比例2:
催化剂的制备参考实施例1,不同之处在于步骤(2)的煅烧温度分别为750℃和850℃,最终制得不同温度下的催化剂,其余步骤与实施例1相同。如图5所示,在750℃和850℃的XRD图中出现β-Mo2C的衍射峰,说明在750℃和850℃下所制备的Mo2C为α-Mo2C和β-Mo2C的混合相。
对比例3:
催化剂的制备参考实施例1,不同之处在于步骤(1)中选用的有机胺为苯胺的水溶液,苯胺与水的比例0.076g/mL,步骤(2)中的煅烧温度为940℃,其余步骤与实施例1相同。
图6为对比例2所制备的Mo2C的SEM图,可以看出,以苯胺为有机碳源所制备的Mo2C呈现无规则的形貌,其比表面积仅为9.0136m2/g。
Claims (10)
1.一种具有片层结构Mo2C助催化剂的制备方法,其特征在于:以十六胺和四水合七钼酸铵为原料,通过有机无机杂化法,经压片、高温碳化、钝化制得具有片层结构的Mo2C。
2.按照权利要求1所述的具有片层结构Mo2C助催化剂的制备方法,其特征在于,具体步骤为:将四水合七钼酸铵的水溶液逐滴加入到十六胺的乙醇溶液中,并以盐酸调节pH=1~8;滴毕,转移至40~70℃加热3~8h,随后将沉淀抽滤,洗涤,干燥;将干燥好的前驱体研磨后压片,在惰性气氛的保护气存在下,碳化,再经体积比98:2~99.5:0.5,优选99:1~99.2:0.8的N2:O2钝化气钝化后得到具有片层结构。
3.根据权利要求2所述的制备方法,其特征在于:四水合七钼酸铵水溶液的浓度为0.04g/mL~0.1g/mL,优选0.05g/mL~0.07g/mL;十六胺的乙醇溶液的浓度为0.025g/mL~0.05g/mL,优选0.03g/mL~0.04g/mL;以100mL的十六胺的乙醇溶液计,滴速控制在2mL/min~5mL/min,优选3min/L~4min/L,搅拌速度控制在400rpm/min~800rpm/min,优选500rpm/min~700rpm/min,盐酸的浓度为1mol/L~2mol/L,调节pH的优选范围为1-2。
4.根据权利要求2所述的制备方法,其特征在于:加热的温度优选50℃~60℃,加热时长优选5h~6h;洗涤时以乙醇和去离子水依次分别洗涤3~5次;干燥为真空干燥,干燥温度90℃~120℃,优选100℃~110℃,时常为12h~36h,优选20h~30h。
5.根据权利要求2所述的制备方法,其特征在于:压片时每片所取前驱体的质量为0.5g~2g,优选1g~1.5g,压片机的压力范围在20MPa~50MPa,优选25MPa~35MPa。
6.根据权利要求2所述的制备方法,其特征在于:碳化的气氛为氩气、氦气以及氮气氛围中的一种或二种以上,流量为20ml/min~100ml/min,优选40ml/min~60ml/min;管式炉中碳化,温度在900~1000℃,优选950℃~970℃;钝化时长为6~24h,优选10h~12h。
7.一种权利要求1-6任一所述制备方法制备获得的Mo2C。
8.根据权利要求7所述的Mo2C,单层片的厚度在10nm~20nm,片层之间的距离为5nm~50nm。
9.一种权利要求7或8所述的Mo2C作为催化剂的活性成份和/或载体可应用于光催化、电催化或光电催化产氢过程中。
10.根据权利要求9所述的Mo2C的应用,将权利要求7所述的Mo2C与CdS半导体光催化剂复合,它们质量比范围为1:100~10:100,优选3:100~7:100,可用于光催化分解水制氢过程中。
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