CN113385185A - 一种高活性、可选择性的钙钛矿型光热催化剂及其制备方法和应用 - Google Patents
一种高活性、可选择性的钙钛矿型光热催化剂及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种高活性、可选择性的钙钛矿型光热催化剂及其制备方法与应用。本发明的光热催化剂的化学组成表达式为LaMn0.5N0.5O3‑δ,其中N为Co,Cu,Fe或Ni。本发明利用溶胶凝胶法进行制备,该方法能获得颗粒细,纯度高,催化活性好的纳米粉体,所得的光热催化剂的比表面积在10.72~18.40m2/g。本发明的光热催化剂应用于150~350℃可见光条件下的光热催化还原二氧化碳体系中,CO2可被高效的催化还原成10~100μmol的甲烷和1~80μmol的甲醇,并且具有60‑99%的产物选择性,验证了本发明制备的光热催化剂具有较高的光热还原效率和选择性。
Description
技术领域
本发明涉及一种高活性、可选择性的钙钛矿型光热催化剂及其制备方法和应用,属于光催化还原技术领域。
背景技术
目前,使用化石燃料在燃烧过程中会向大气中排放大量的二氧化碳,二氧化碳做为温室气体的主要来源,使得全球气温持续升高,大量的二氧化碳排放到大气中会导致海平面上升,进而导致沿海洪灾。因此,将CO2转化为其他有用的化学物质,在生态和经济上都是有益的。在通常的方法中,光催化是首选,因为光催化仅需要太阳辐射作为能源,并且已被证明在各种应用中有效,在光催化剂的作用下将CO2进行转化,这不仅解决了CO2在大气中浓度过高的问题,而且可以得到更有意义的清洁能源。光催化剂材料的选择至关重要,氧化钛(TiO2)等金属氧化物以其优异的稳定性及电荷转移潜力性好的属性而被广泛应用。但是,这些光催化剂都属于宽带隙的氧化物,电子与空穴复合较快,来不及与表面的反应物发生反应,催化效率低不利于催化活性。
随着光催化技术的研究深入,通式为ABO3的钙钛矿型光催化剂由于具有较高的晶格畸变,较窄的带隙,电荷载流子的分离效果更好等特点引起了人们的广泛关注。但是钙钛矿氧化物型的光催化剂对产物的选择性并不是很高,从催化活性的角度考虑,A位离子的作用本质上不直接参与反应,起稳定结构的作用,B位是催化活性中心,所以合理的选择B位元素有利于提高光热催化活性,并可以增加催化选择性。
发明内容
本发明解决的技术问题是:如何提高光热催化剂的催化效率和选择性等问题。
为了解决上述技术问题,本发明提供了一种高活性、可选择性的钙钛矿型光热催化剂,其化学组成表达式为LaMn0.5N0.5O3-δ,其中N为Co,Cu,Fe和Ni中的任意一种元素。
本发明还提供了上述的高活性、可选择性的钙钛矿型光热催化剂的制备方法,包括如下步骤:
步骤1:按2:1:1的摩尔比将La(NO3)3·6H2O、Mn(NO3)3·4H2O与N的硝酸盐溶于去离子水中;
步骤2:加入柠檬酸一水合物,加热搅拌至凝胶状;
步骤3:经烘箱烘干后,取出用研磨成粉状;
步骤4:放入马弗炉中空气气氛下煅烧并保温后取出研磨成粉,即得高活性、可选择性的钙钛矿型光热催化剂。
优选地,所述步骤1中的硝酸盐为硝酸钴、硝酸镍、硝酸铁和硝酸铜中的一种或其水合物。
优选地,所述步骤2中柠檬酸一水合物加入的摩尔量为硝酸盐的1.2倍。
优选地,所述步骤2中加热搅拌的温度为60~120℃,时间为2~8h。
优选地,所述步骤4中煅烧的温度为500~1000℃,保温时间为6~10h,所述煅烧的过程中的升温速率为5~10℃/min。
本发明还提供了上述的高活性、可选择性的钙钛矿型光热催化剂在光催化领域中的应用。
优选地,所述应用包括在光催化还原CO2中的应用。
优选地,所述的光催化还原CO2的应用中,采用水作为还原剂,其中,光热催化剂LaMn0.5N0.5O3-δ与CO2和水的比例为0.1~1g:100~500mL:0.1~1mL。
优选地,所述的光催化还原CO2的条件为:在150~350℃条件下采用可见光照射。
本发明与现有技术相比,具有如下有益效果:
1.本发明采用溶胶凝胶法制备光热催化剂,该方法容易获得颗粒细、纯度高的纳米粉体,且在过程中,不用机械混合因此不易引进杂质;此外,反应可以在低温下进行,避免了高温对反应容器的污染等问题,在纳米材料的掺杂过程中,可以使得可溶性微量掺杂组分分布均匀,不会发生分离和偏析,因此,制得的钙钛矿型光热催化剂的粉体颗粒较细,呈黑色粉末状,对可见光有较强的响应能力,且粉末化学活性高;
2.本发明制备的光热催化剂均属于四电子反应路径,因此,光热催化活性好,在150~350℃光热耦合条件下0.1~1g催化剂材料与H2O蒸汽还原CO2得到60~99%的CH4和10~75%的CH3OH。
附图说明
图1为实施例1~4制备所得的光热催化剂的X射线衍射(XRD)曲线图。
具体实施方式
为使本发明更明显易懂,兹以优选实施例,并配合附图作详细说明如下。
实施例1
一种高活性、可选择性的LaMn0.5Ni0.5O3-δ光热催化剂的制备方法,包括以下步骤:
步骤S1:将0.03mol的La(NO3)3·6H2O、0.015mol的Mn(NO3)3·4H2O和0.015mol的Ni(NO3)3·6H2O混合,加入到60mL去离子水中;
步骤S2:再依据硝酸盐与柠檬酸的总量1:1.2的摩尔比,将0.072mol的一水合柠檬酸加入混合均匀;
步骤S3:将混合溶液在80℃水浴条件下加热搅拌直到形成溶胶;
步骤S4:转移到烘箱中保持170℃烘干,取出用研钵研磨成粉状;
步骤S5:在700℃的煅烧温度下保温7h,取出研磨后得到钙钛矿型的纳米粉体。
实施例2
一种高活性、可选择性的LaMn0.5Co0.5O3-δ光热催化剂的制备方法,包括以下步骤:
步骤S1:将0.03mol的La(NO3)3·6H2O、0.015mol的Mn(NO3)3·4H2O和0.015mol的Co(NO3)3·6H2O混合,加入到60mL去离子水中;
步骤S2:再依据硝酸盐与柠檬酸的总量1:1.2的摩尔比,将0.072mol的一水合柠檬酸加入混合均匀后;
步骤S3:将混合溶液在80℃水浴条件下加热搅拌直到形成溶胶;
步骤S4:转移到烘箱中保持170℃烘干,取出用研钵研磨成粉状;
步骤S5:在700℃的煅烧温度下保温7h,取出后得到钙钛矿型的纳米粉体。
实施例3
一种高活性、可选择性的LaMn0.5Cu0.5O3-δ光热催化剂的制备方法,包括以下步骤:
步骤S1:将0.03mol的La(NO3)3·6H2O、0.015mol的Mn(NO3)3·4H2O和0.015mol的Cu(NO3)2·3H2O混合混合,加入到60mL去离子水中;
步骤S2:再依据硝酸盐与柠檬酸的总量1:1.2的摩尔比,将0.072mol的一水合柠檬酸加入混合均匀后;
步骤S3:在80℃水浴条件下加热搅拌直到形成溶胶;
步骤S4:转移到烘箱中保持170℃烘干,取出用研钵研磨成粉状;
步骤S5:在700℃的煅烧温度下保温7h,取出后得到钙钛矿型的纳米粉体。
实施例4
一种高活性、可选择性的LaMn0.5Fe0.5O3-δ光热催化剂的制备方法,包括以下步骤:
步骤S1:La(NO3)3·6H2O、0.015mol的Mn(NO3)3·4H2O和0.015mol的Fe(NO3)3·9H2O混合,加入到60ml去离子水中;
步骤S2:再依据硝酸盐与柠檬酸的总量1:1.2的摩尔比,将0.072mol的一水合柠檬酸加入混合均匀后;
步骤S3:将混合溶液在80℃水浴条件下加热搅拌直到形成溶胶;
步骤S4:转移到烘箱中保持170℃烘干,取出用研钵研磨成粉状;
步骤S5:在700℃的煅烧温度下保温7h,取出后得到钙钛矿型的纳米粉体。
实施例1~4所制备的光热催化剂的XRD测试结果如图1所示,由图1可以看出利用溶胶凝胶法所合成的样品均为纯相没有杂相的衍射峰出现,且峰型较为尖锐,结晶度较好,表明LaMn0.5Ni0.5O3-δ、LaMn0.5Co0.5O3-δ、LaMn0.5Cu0.5O3-δ和LaMn0.5Fe0.5O3-δ四个样品成功合成。
经测试,实施例1~4所制备的光热催化剂的比表面积在10.72~18.40m2/g。
应用实施例1
实施例1~4制备所得的LaMn0.5N0.5O3-δ(N=Ni、Co、Cu和Fe)光热催化剂在催化还原CO2中的应用:
步骤S1:取0.1~1g的LaMn0.5N0.5O3-δ光催化剂置于210mL的CO2光热催化反应器中;
步骤S2:用真空泵将反应器内的空气抽至真空环境;
步骤S3:然后将CO2(99.999wt%)充盈反应器5min;
步骤S4:当系统温度升到120℃时,注入去离子水(0.3mL),加热至150~350℃反应1h,每间隔一小时采集样品,取0.5mL注入气相色谱仪中测试光催化性能。(在可见光照射下,通过石英反应器周围的加热套来控制温度,整个催化反应在150~350℃以及可见光下进行。)
其中,实施例1制备得到的LaMn0.5Ni0.5O3-δ光热催化剂用于上述的光催化还原CO2中,在反应1~6h后可得到50~100μmol的甲烷,1~10μmol甲醇。对产物甲烷的选择性达到80~99%。
实施例2制备得到的LaMn0.5Co0.5O3-δ光热催化剂用于上述的光催化还原CO2中,在反应1~6h后可得到30~70μmol的甲烷,10~20μmol甲醇。对产物甲烷的选择性达到70~90%。
实施例3制备得到的LaMn0.5Cu0.5O3-δ光热催化剂用于上述的光催化还原CO2中,在反应1~6h后可得到20~40μmol的甲烷,60~80μmol甲醇。对产物甲醇的选择性达到60~80%。
实施例4制备得到的LaMn0.5Fe0.5O3-δ光热催化剂用于上述的光催化还原CO2中,在反应1~6h后可得到10~20μmol的甲烷,1~10μmol甲醇。对产物甲烷的选择性达到60~90%。
以上所述,仅为本发明的较佳实施例,并非对本发明任何形式上和实质上的限制,应当指出,对于本技术领域的普通技术人员,在不脱离本发明的前提下,还将可以做出若干改进和补充,这些改进和补充也应视为本发明的保护范围。
Claims (10)
1.一种高活性、可选择性的钙钛矿型光热催化剂,其特征在于,其化学组成表达式为LaMn0.5N0.5O3-δ,其中N为Co,Cu,Fe和Ni中的任意一种元素。
2.权利要求1所述的高活性、可选择性的钙钛矿型光热催化剂的制备方法,其特征在于,包括如下步骤:
步骤1:按2:1:1的摩尔比将La(NO3)3·6H2O、Mn(NO3)3·4H2O与N的硝酸盐溶于去离子水中;
步骤2:加入柠檬酸一水合物,加热搅拌至凝胶状;
步骤3:经烘箱烘干后,取出用研磨成粉状;
步骤4:放入马弗炉中空气气氛下煅烧并保温后取出研磨成粉,即得高活性、可选择性的钙钛矿型光热催化剂。
3.如权利要求2所述的高活性、可选择性的钙钛矿型光热催化剂的制备方法,其特征在于,所述步骤1中的硝酸盐为硝酸钴、硝酸镍、硝酸铁和硝酸铜中的一种或其水合物。
4.如权利要求2所述的高活性、可选择性的钙钛矿型光热催化剂的制备方法,其特征在于,所述步骤2中柠檬酸一水合物加入的摩尔量为硝酸盐的1.2倍。
5.如权利要求2所述的高活性、可选择性的钙钛矿型光热催化剂的制备方法,其特征在于,所述步骤2中加热搅拌的温度为60~120℃,时间为2~8h。
6.如权利要求2所述的高活性、可选择性的钙钛矿型光热催化剂的制备方法,其特征在于,所述步骤4中煅烧的温度为500~1000℃,保温时间为6~10h,所述煅烧的过程中的升温速率为5~10℃/min。
7.权利要求1所述的高活性、可选择性的钙钛矿型光热催化剂在光催化领域中的应用。
8.如权利要求7所述的应用,其特征在于,所述应用包括在光催化还原CO2中的应用。
9.如权利要求8所述的应用,其特征在于,所述的光催化还原CO2的应用中,采用水作为还原剂,其中,光热催化剂LaMn0.5N0.5O3-δ与CO2和水的比例为0.1~1g:100~500mL:0.1~1mL。
10.如权利要求9所述的应用,其特征在于,所述的光催化还原CO2的条件为:在150~350℃条件下采用可见光照射。
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