CN110479290B - 一种低温固相界面掺杂型CoB催化剂及其制备方法与应用 - Google Patents
一种低温固相界面掺杂型CoB催化剂及其制备方法与应用 Download PDFInfo
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Abstract
一种低温固相界面掺杂型CoB催化剂,按如下方法制备得到:将钴盐、掺杂金属盐溶于水,冰冻为固体,随后在1~5℃下将硼氢化钠粉末均匀置于冰冻所得固体表面进行还原反应,得到黑色悬浊液,抽滤,洗涤,真空干燥,得到掺杂型CoB催化剂;本发明采用固相界面和低温环境1~5℃进行反应,降低了硼氢化钠还原速率,进而克服钴基催化剂在反应过程中易团聚、被降解甚至被刻蚀导致产氢效率低的问题;本发明进行掺杂金属盐的目的是防止CoB团聚,使其颗粒分布均一,提高比表面积,从而进一步提高硼氢化钠水解产氢速率。
Description
(一)技术领域
本发明属于功能材料制备技术领域,涉及一种CoB催化剂及其制备方法与应用,尤其是一种低温固相界面掺杂型CoB催化剂及其制备方法,以及在催化硼氢化钠水解产氢中的应用。
(二)背景技术
近年来,天然化石燃料的快速消耗是引起全球气候变暖和环境污染的重要原因,寻求清洁、可持续发展的能源已迫在眉睫。氢气以其高能量密度、零污染及易获得等诸多优点被看作是新一代的燃料。在当前研究制氢与储氢的方法中,化学氢化物由于储氢环境温和、制氢过程安全易控等优点而成为研究热点。
化学氢化物虽然在室温下水解产氢是自发的,但水解产氢速率较低。因此,为了加快化学氢化物水解产氢速率,催化剂的使用显得尤为重要。在催化化学氢化物水解制氢的众多催化剂中,钴基纳米催化剂以其高催化活性及廉价等优点引起了研究者的广泛关注。
钴基催化剂虽然在参与化学氢化物水解产氢的所有催化剂中活性高且廉价易得,但是却在反应过程中易团聚、被降解甚至被刻蚀,从而导致材料的形貌及结构发生改变,进而降低催化剂的稳定性及循环使用率。因此开发新型结构和表面组成的钴基催化剂,提高化学氢化物产氢效率及催化剂循环使用率在当前社会上具有十分重要的意义。
(三)发明内容
为了克服现有钴基催化剂在反应过程中易团聚、被降解甚至被刻蚀导致产氢效率低的问题,本发明提供了一种低温固相界面掺杂型CoB催化剂及其制备方法与应用,本发明制备方法简单,并且所得催化剂应用于硼氢化钠水解反应中的产氢速率较快。
本发明的技术方案如下:
一种低温固相界面掺杂型CoB催化剂,按如下方法制备得到:
将钴盐、掺杂金属盐溶于水,冰冻为固体,随后在1~5℃下将硼氢化钠粉末均匀置于冰冻所得固体表面进行还原反应(反应时间通常在2h),得到黑色悬浊液,抽滤,洗涤(乙醇与蒸馏水交替洗涤三次),真空干燥(温度为60~100℃),得到掺杂型CoB催化剂;
所述钴盐、掺杂金属盐、硼氢化钠的物质的量之比为1:0.01~0.3:1~20;
所述水的体积用量以钴盐的物质的量计为10mL/mmol;
所述钴盐为CoCl2·6H2O;
所述掺杂金属盐为Ce(NO3)3·6H2O、CuCl2·2H2O或FeCl3·6H2O。
本发明制得的掺杂型CoB催化剂可应用于水解产氢反应中。
具体的,所述应用的方法为:
25~30℃恒温水浴条件下,将所述掺杂型CoB催化剂加到硼氢化钠和氢氧化钠的混合水溶液中进行水解产氢;
所述硼氢化钠和氢氧化钠的混合水溶液中,硼氢化钠的浓度为1~10wt%,氢氧化钠的浓度为1~10wt%;
所述掺杂型CoB催化剂的用量以硼氢化钠和氢氧化钠的混合水溶液的体积计为1~5 mg/mL。
与现有技术相比,本发明的有益效果在于:
本发明采用固相界面和低温环境1~5℃进行反应,降低了硼氢化钠还原速率,进而克服钴基催化剂在反应过程中易团聚、被降解甚至被刻蚀导致产氢效率低的问题。
本发明进行掺杂金属盐的目的是防止CoB团聚,使其颗粒分布均一,提高比表面积,从而进一步提高硼氢化钠水解产氢速率。
(四)附图说明
图1为本发明制备的CoB/Ce催化剂的SEM图。
图2为本发明制备的CoB/Ce催化剂的XRD衍射图。
图3为本发明制备的CoB/Ce催化剂的BET粉末图。
图4为本发明制备的各种掺杂型CoB催化剂的产氢速率图。
(五)具体实施方式
下面结合附图,通过具体实施方式对本发明一种低温固相界面掺杂型CoB催化剂的制备方法及产氢应用作进一步说明,但本发明的保护范围并不仅限于此。
实施例1:
将0.2379g(0.001mol)CoCl2·6H2O和0.0217g(0.00005mol)Ce(NO3)3·6H2O在超声条件下溶于10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783 g(0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于60℃真空干燥箱中,12h后即可得到CoB/Ce催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴30℃下,将10mg CoB/Ce催化剂加入10ml 1wt%NaBH4和1wt%NaOH水溶液中进行产氢速率测试。产氢速率为5.57L min-1g催化剂 -1。
实施例2:
将0.2379g(0.001mol)CoCl2·6H2O和0.0434g(0.0001mol)Ce(NO3)3·6H2O在超声条件下溶于10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783 g(0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于60℃真空干燥箱中,12h后即可得到CoB/Ce催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴30℃下,将10mg CoB/Ce催化剂加入到 10ml 1wt%NaBH4和1wt%NaOH水溶液中进行产氢速率测试。产氢速率为4.62L min- 1g催化剂 -1。
实施例3:
将0.2379g(0.001mol)CoCl2·6H2O和0.0217g(0.0001mol)Ce(NO3)3·6H2O在超声条件下溶于10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783g (0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于100℃真空干燥箱中,12h后即可得到CoB/Ce催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴30℃下,将10mg CoB/Ce催化剂加入到 10ml 5wt%NaBH4和5wt%NaOH水溶液中进行产氢速率测试。产氢速率为6.12L min- 1g催化剂 -1。
实施例4:
将0.2379g(0.001mol)CoCl2·6H2O和0.0086g(0.00005)CuCl2·2H2O在超声条件下溶于10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783g(0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于60℃真空干燥箱中,12h后即可得到CoB/Cu催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴30℃下,将10mg CoB/Cu催化剂加入到 10ml 1wt%NaBH4和1wt%NaOH水溶液中进行产氢速率测试。产氢速率为1.62L min- 1g催化剂 -1。
实施例5:
将0.2379g(0.001mol)CoCl2·6H2O和0.0172g(0.0001)CuCl2·2H2O在超声条件下溶于 10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783g(0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于60℃真空干燥箱中,12h后即可得到CoB/Cu催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴30℃下,将10mg CoB/Cu催化剂加入到 10ml 5wt%NaBH4和5wt%NaOH水溶液中进行产氢速率测试。产氢速率为1.82L min- 1g催化剂 -1。
实施例6:
将0.2379g(0.001mol)CoCl2·6H2O和0.0081g(0.00005mol)FeCl3·6H2O在超声条件下溶于10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783g (0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于60℃真空干燥箱中,12h后即可得到CoB/Fe催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴25℃下,将10mg CoB/Fe催化剂加入到 10ml 1wt%NaBH4和1wt%NaOH水溶液中进行产氢速率测试。产氢速率为1.37L min- 1g催化剂 -1。
实施例7:
将0.2379g(0.001mol)CoCl2·6H2O和0.0162g(0.0001mol)FeCl3·6H2O在超声条件下溶于10ml蒸馏水后,置于直径为60mm的平面皿低温冰冻为固体;在5℃条件下将0.3783g (0.01mol)NaBH4固体粉末均匀置于冰表面发生固固界面反应;2h后得到黑色悬浊液,经抽滤,乙醇与水交替洗涤三次后放于60℃真空干燥箱中,12h后即可得到CoB/Fe催化剂。
对其进行NaBH4水溶液产氢实验,在恒温水浴30℃下,将10mg CoB/Fe催化剂加入到10ml 5wt%NaBH4和5wt%NaOH水溶液中进行产氢速率测试。产氢速率为1.90L min- 1g催化剂 -1。
对比例
赵等人(赵斌;沈晓晨;戴敏;高鸣;丁维平.一种硼氢化钠水解制氢的负载型CoB催化剂及其制备方法[P].中国专利:CN102950009A,2012-10-12.)首先将TiO2载体用硝酸银、甲醛和氢氧化钠混合溶液进行敏化处理,采用醋酸钴、硼砂和氯化铵作为化学电镀液,氢氧化钠调节溶液pH=11~12之后缓慢通入硼氢化钠溶液,通过化学电镀法制得了CoB/Ag-TiO2催化剂,硼氢化钠产氢速率为4.69Lmin-1g催化剂 -1。
对比例采用化学电镀法进行制备负载型CoB催化剂,成本昂贵且步骤复杂。而本申请使用固固相反应的界面合成方法,不使用有机溶剂和模板剂,制备工艺简单快速、绿色环保;且创新采用稀土金属Ce来替代贵金属等负载体进行掺杂,降低成本,硼氢化钠产氢速率可高达6.12Lmin-1g催化剂 -1,速率较快。
Claims (7)
1.一种低温固相界面掺杂型CoB催化剂,其特征在于,按如下方法制备得到:
将钴盐、掺杂金属盐溶于水,冰冻为固体,随后在1~5℃下将硼氢化钠粉末均匀置于冰冻所得固体表面进行还原反应,得到黑色悬浊液,抽滤,洗涤,真空干燥,得到掺杂型CoB催化剂;
所述掺杂金属盐为Ce(NO3)3·6H2O、CuCl2·2H2O或FeCl3·6H2O。
2.如权利要求1所述的低温固相界面掺杂型CoB催化剂,其特征在于,所述钴盐、掺杂金属盐、硼氢化钠的物质的量之比为1:0.01~0.3:1~20。
3.如权利要求1所述的低温固相界面掺杂型CoB催化剂,其特征在于,所述水的体积用量以钴盐的物质的量计为10mL/mmol。
4.如权利要求1所述的低温固相界面掺杂型CoB催化剂,其特征在于,所述钴盐为CoCl2·6H2O。
5.如权利要求1所述的低温固相界面掺杂型CoB催化剂,其特征在于,所述还原反应的时间在2h。
6.如权利要求1所述的低温固相界面掺杂型CoB催化剂在水解产氢反应中的应用。
7.如权利要求6所述的应用,其特征在于,所述应用的方法为:
25~30℃恒温水浴条件下,将所述掺杂型CoB催化剂加到硼氢化钠和氢氧化钠的混合水溶液中进行水解产氢;
所述硼氢化钠和氢氧化钠的混合水溶液中,硼氢化钠的浓度为1~10wt%,氢氧化钠的浓度为1~10wt%;
所述掺杂型CoB催化剂的用量以硼氢化钠和氢氧化钠的混合水溶液的体积计为1~5mg/mL。
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