WO2019109830A1 - 一种复合钼酸盐空心微球的制备方法及其应用 - Google Patents

一种复合钼酸盐空心微球的制备方法及其应用 Download PDF

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WO2019109830A1
WO2019109830A1 PCT/CN2018/117564 CN2018117564W WO2019109830A1 WO 2019109830 A1 WO2019109830 A1 WO 2019109830A1 CN 2018117564 W CN2018117564 W CN 2018117564W WO 2019109830 A1 WO2019109830 A1 WO 2019109830A1
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solution
water
mmol
hollow microspheres
preparing
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廖锦云
卢东升
李�浩
肖定书
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惠州学院
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  • the invention relates to the technical field of compound preparation, in particular to a preparation method of composite molybdate hollow microspheres and an application thereof for catalyzing hydrogen production by ammonia borane hydrolysis.
  • molybdate compound is combined with one or more cations to form molybdate having different properties, for example, with La, Eu, etc., which can constitute a phosphor powder material; and Co, Ni, Cu can be composed A catalyst with superior catalytic properties.
  • Molybdate can be used in the field of optics, electricity, catalysis, and medical fields through different combinations. Therefore, molybdate is an important member of inorganic functional materials.
  • Liangjun Wang et al. Liangjun Wang et al. Synthesis of porous CoMoO4 nanorods as a bifunctional cathode catalyst for a Li-O2 battery and superior anode for a Li-ion battery.
  • CoMoO4 nanorods were synthesized by using a mixture of ultrapure water, ethanol and ethylene glycol as solvent to obtain CoMoO4 nanorods.
  • the preparation process was simple, but the organic solvent and rare The use of gas is costly; Xiaoqin Yan et al. (3D architecture of a graphene/CoMoO4 composite for asymmetric supercapacitors usable at various temperatures. J. Colloid Interface Sci., 2017, 493, 42-50) Graphene as a template, two-step hydrothermal synthesis of CoMoO4 nanosheets, and The use of argon as a shielding gas in the calcination stage still makes the preparation costly.
  • the morphology of the products of cobalt molybdate and copper molybdate is mostly nano-sheets and nanoparticles.
  • the micro-hollow spheres have not been reported.
  • the hollow spheres have high effective contact. The area and porosity are therefore a boost to the activity of the catalyst.
  • the technical problem to be solved by the invention is to provide a preparation method of multi-molybdate hollow microspheres, which uses urea as a precipitant, for the key problems of high preparation cost and uncontrollable morphology in the above preparation process.
  • the multi-molybdate hollow microsphere structure was successfully synthesized by hydrothermal synthesis method.
  • the synthesis method provides technical support for systematically studying the structure-activity relationship between the microstructure and properties of multi-molybdate nanomaterials, and also promotes the material. Low-cost and large-scale production has taken an important step.
  • the technical solution adopted by the present invention is: a method for preparing a composite molybdate hollow microsphere, comprising the following steps:
  • the muffle furnace is calcined at 350 to 500 ° C for 2 to 4 hours.
  • the ratio of the total mass of the soluble nickel salt, the cobalt salt and the copper salt in the step (1) to the mass ratio of the molybdic acid is 1:1.
  • the stirring time is 0.5-1 h.
  • the vacuum oven temperature is 40 to 60 °C.
  • the unique nano hollow sphere prepared by the invention has high effective contact area and porosity
  • the preparation process does not use a surfactant or the like as a structure directing agent to control the morphology;
  • the synthesized multi-molybdate hollow microspheres are expected to be highly active catalysts due to their microstructural characteristics, such as superior catalytic activity in catalyzing the hydrolysis of ammonia borane to hydrogen production.
  • Figure 1 is an SEM image of Co0.8Cu0.2MoO4 prepared according to the present invention.
  • Figure 5 is a catalytic hydrogen production test curve of Co 0.8 Cu 0.2 MoO 4 prepared according to the present invention.
  • Figure 1 is an SEM image of Co 0.8 Cu 0.2 MoO 4 prepared according to the present invention. It can be seen from the scanning chart that the morphology of Co 0.8 Cu 0.2 MoO 4 synthesized by hydrothermal formation is nano hollow microspheres having a diameter of about 0.5 to 0.8 um.
  • the catalyst performance of the hollow microspheres can be further confirmed from the projection chart.
  • Figure 3 is an XRD test of Co 0.8 Cu 0.2 MoO 4 prepared according to the present invention. The characteristic peaks of the crystal faces corresponding to CuMoO 4 and CoMoO 4 are indicated in the figure.

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Abstract

一种复合钼酸盐空心微球的制备方法，包括以下步骤：（1）取MCl2 1-4mmol溶于20ml水，得溶液A；再取钼酸1-4mmol溶于20ml水，得溶液B；将二者混合；其中M表示Co、Ni、Cu；（2）取10-40mmol尿素溶于40ml水，加入上述溶液，搅拌均匀；（3）将上述混合液移至反应釜，120-160℃反应6-12h；（4）抽滤水洗，真空烘箱40-60℃烘干；（5）马弗炉350-500℃煅烧2-4h。制备得到的复合钼酸盐空心微球具备较高的有效接触面积及孔隙率，工艺简单，原料廉价易得，制备过程未使用表面活性剂等作为结构导向剂来控制形貌，合成的多元钼酸盐空心微球在催化氨硼烷水解产氢方面表现出优越的催化活性。

Description

一种复合钼酸盐空心微球的制备方法及其应用 技术领域
本发明涉及化合物制备技术领域，尤其涉及一种复合钼酸盐空心微球的制备方法及其在催化氨硼烷水解产氢上的应用。
背景技术
钼酸盐化合物通过(MoO4)2-与一种或一种以上阳离子组合成具有不同性质的钼酸盐，例如，与La、Eu等可以组成荧光粉体材料；与Co、Ni、Cu可以组成具有优越催化性能的催化剂。通过不同组合的钼酸盐能在光学领域，电学领域，催化领域，医疗领域都有不俗的表现，因此钼酸盐是无机功能材料中的重要成员。
近年来，钼酸盐纳米材料的制备方法一直是研究热点，传统的高温固相法需要较高温度，而且不能保证得到形貌较好的晶体，因此，一些低温合成方法，如水热合成法、模板法、微乳液法、沉淀法应运而生。如L.Zhen等人(L.Zhen et al.High photocatalytic activity and photoluminescence property of hollow CdMoO4 microspheres.Scripta Materialia,2008,58,461–464)用沉淀法在室温水溶液中合成了中空的CdMoO4微球。在反应过程中加入的可溶性的无机盐NaCl虽然没有参加反应，但作为配合助剂而影响CdMoO4的沉淀速度；但此制备方法需要将悬浮液静置5天，周期较长，不利于工业化生产；Liangjun Wang等人(Liangjun Wang et al.Synthesis of porous CoMoO4 nanorods as a bifunctional cathode catalyst for a Li–O2 battery and superior anode for a Li-ion battery.Nanoscale,2017,9,3898–3904)采用溶剂热合成法合成CoMoO4纳米棒，在反应过程中用超纯水、乙醇、乙二醇的混合液为溶剂制备前驱体，经氩气氛围煅烧得到CoMoO4纳米棒，该方法制备工艺简单，但有机溶剂与稀有气体的使用，成本较高；Xiaoqin Yan等人(Xiaoqin Yan et al.3D architecture of a graphene/CoMoO4 composite for asymmetric supercapacitors usable at various temperatures.J.Colloid Interface Sci.,2017,493,42–50)以石墨烯作为模板，两步水热法合成了CoMoO4纳米片，而且煅烧阶段以氩气作为保护气体，仍然使得制备成本不菲；钼酸钴及钼酸铜合成产物形貌多为纳米片、纳米颗粒，微米空心球未见报道，空心球具有较高的有效接触面积及孔隙率，因此对于催化剂的活性而言是一种促进。
发明内容
本发明所要解决的技术问题是，针对上述制备过程中存在的制备成本高、形貌不可控等关键问题，而提供一种多元钼酸盐空心微球的制备方法，其以尿素为沉淀剂，应用水热合成法成功合成了多元钼酸盐空心微球结构；该合成方法为系统研究多元钼酸盐纳米材料微观结 构与性能之间的构效关系提供了技术支持，同时也为推动材料的低成本规模化生产迈出了重要一步。
为解决以上技术问题，本发明采用的技术方案是：一种复合钼酸盐空心微球的制备方法，包括以下步骤：
(1)、取MCl2 1～4mmol溶于20mL水，得溶液A；再取钼酸1～4mmol溶于20mL水，得溶液B；将二者混合；其中M表示Co、Ni、Cu；
(2)、取10～40mmol尿素溶于40mL水，加入上述溶液；搅拌均匀；
(3)、将上述混合液移至反应釜，120～160℃反应6～12h；
(4)、抽滤水洗，真空烘箱40～60℃烘干；
(5)马弗炉350～500℃煅烧2～4h。
优选的，步骤(1)中可溶性镍盐、钴盐、铜盐总物质量与钼酸的物质量比值1:1。
优选的，步骤(2)中，搅拌时间为0.5-1h。
优选的，步骤(3)中，真空烘箱温度为40～60℃。
综上所述，运用本发明的技术方案，具有如下有益效果：
1.本发明制备的独特纳米空心球，具有较高的有效接触面积及孔隙率；
2.工艺简单，原料价廉易得；
3.制备过程并未使用表面活性剂等作为结构导向剂来控制形貌；
合成的多元钼酸盐空心微球因微观结构特点有望作为高活性催化剂，如在催化氨硼烷水解产氢方面表现出优越的催化活性。
附图说明
图1为本发明制备的Co0.8Cu0.2MoO4的SEM图；
图2为本发明制备的Co0.8Cu0.2MoO4的TEM图；
图3为本发明制备的Co0.8Cu0.2MoO4的BET测试曲线；
图4为本发明制备的Co 0.8Cu 0.2MoO 4的XRD测试曲线；
图5为本发明制备的Co 0.8Cu 0.2MoO 4的催化产氢测试曲线。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，但不构成对本发明保护范围的限制。
实施例1
1、取CuCl 2 1mmol溶于20mL水，得溶液A；再取钼酸1mmol溶于20mL水，得溶液B；将二者混合；
2、取10mmol尿素溶于40mL水，加入上述溶液；搅拌30min后移至反应釜，160℃反应8h；抽滤水洗，真空烘箱40℃烘干；马弗炉500℃煅烧2h；该样品组成为CuMoO 4；
实施例2
1、取CuCl 2x mmol、NiCl 2y mmol、CoCl 2(1-x-y)mmol溶于20mL水，得溶液A；再取钼酸2mmol溶于20mL水，得溶液B；将二者混合；
2、取20mmol尿素溶于40mL水，加入上述溶液；搅拌30min后移至反应釜，120℃反应12h；抽滤水洗，真空烘箱60℃烘干；马弗炉500℃煅烧2h；该样品组成为Cu xCo yNi 1-x-yMoO 4；
实施例3
1、取CuCl 2x mmol、NiCl 2y mmol、CoCl 2(1-x-y)mmol溶于20mL水，得溶液A；再取钼酸2mmol溶于20mL水，得溶液B；将二者混合；
2、取30mmol尿素溶于40mL水，加入上述溶液；搅拌30min后移至反应釜，160℃反应8h；抽滤水洗，真空烘箱40℃烘干；马弗炉350℃煅烧2h；该样品组成为Cu xCo yNi 1-x-yMoO 4；
实施例4
1、取CuCl 2x mmol、NiCl 2y mmol、CoCl 2(1-x-y)mmol溶于20mL水，得溶液A；再取钼酸2mmol溶于20mL水，得溶液B；将二者混合；
2、取40mmol尿素溶于40mL水，加入上述溶液；搅拌30min后移至反应釜，160℃反应12h；抽滤水洗，真空烘箱40℃烘干；马弗炉500℃煅烧4h；该样品组成为Cu xCo yNi 1-x-yMoO 4；
实施例5
1、取CuCl 2x mmol、NiCl 2y mmol、CoCl 2(1-x-y)mmol溶于20mL水，得溶液A；再取钼酸4mmol溶于20mL水，得溶液B；将二者混合；
2、取40mmol尿素溶于40mL水，加入上述溶液；搅拌1h后移至反应釜，160℃反应12h；抽滤水洗，真空烘箱60℃烘干；马弗炉500℃煅烧4h；该样品组成为Cu xCo yNi 1-x-yMoO 4；
1、SEM分析
图1为本发明制备的Co 0.8Cu 0.2MoO 4的SEM图。从扫描图中可以看出，通过水热合成的Co 0.8Cu 0.2MoO 4形貌呈直径约为0.5～0.8um的纳米空心微球。
2、TEM测试
为本发明制备的Co 0.8Cu 0.2MoO 4的TEM图，从投射图中可以进一步证实空心微球的催化剂性能。
3、BET测试
图2为本发明制备的Co 0.8Cu 0.2MoO 4的氮气吸附脱附等温曲线，比表面积为30.01m 2/g。
4、XRD
图3为本发明制备的Co 0.8Cu 0.2MoO 4的XRD测试。图中所标示出的为CuMoO 4与CoMoO 4对应晶面的特征峰。
5、催化产氢性能的测试
图4为本发明制备的Co 0.8Cu 0.2MoO 4作为催化剂催化氨硼烷水解产氢的性能测试，NH 3BH 3用量3mmol，NaOH 20mmol，催化剂10mg。测得25℃下Co 0.8Cu 0.2MoO 4作为催化剂每分钟产氢56mL。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (5)

  1. 一种复合钼酸盐空心微球的制备方法，其特征在于，包括以下步骤：
    (1)、取MCl2 1～4mmol溶于20mL水，得溶液A；再取钼酸1～4mmol溶于20mL水，得溶液B；将二者混合；其中M表示Co、Ni、Cu；
    (2)、取10～40mmol尿素溶于40mL水，加入上述溶液；搅拌均匀；
    (3)、将上述混合液移至反应釜，120～160℃反应6～12h；
    (4)、抽滤水洗，真空烘箱40～60℃烘干；
    (5)马弗炉350～500℃煅烧2～4h。
  2. 根据权利要求1所述的一种复合钼酸盐空心微球的制备方法，其特征在于：步骤(1)中可溶性镍盐、钴盐、铜盐总物质量与钼酸的物质量比值1:1。
  3. 根据权利要求1所述的一种复合钼酸盐空心微球的制备方法，其特征在于：步骤(2)中，搅拌时间为0.5-1h。
  4. 根据权利要求1所述的一种复合钼酸盐空心微球的制备方法，其特征在于：步骤(3)中，真空烘箱温度为40～60℃。
  5. 如权利要求1～4任一项所述的制备方法所制备的复合钼酸盐空心微球作为催化剂在催化氨硼烷水解产氢上的应用。
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