CN114392739A - 一种无光催化降解voc的催化剂及制备工艺、制备装置 - Google Patents
一种无光催化降解voc的催化剂及制备工艺、制备装置 Download PDFInfo
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Abstract
本发明涉及清洁技术领域,具体涉及一种无光催化降解VOC的催化剂及制备工艺、制备装置。该催化剂为C‑M1Ox‑M2Oy‑M3NPs,其中,x、y分别代表催化剂中M1Ox、M2Oy的质量百分含量,x、y数值随着催化剂基材而不同,且50%<x+y<60%;其中,M1Ox为第一助催化剂,M2Oy为第二助催化剂,C表示催化剂TiO2,M3NPs是金属纳米颗粒。M3NPs是Ag纳米颗粒。本发明提供的催化降解VOC的催化剂及制备工艺、制备装置,能够在无光条件下降解VOC,在室内或者无光环境下发挥优良的降解效果。
Description
技术领域
本发明属于清洁技术领域,具体涉及一种无光催化降解VOC的催化剂及制备工艺、制备装置。
背景技术
随着人们对居住环境的要求越来越高,室内环境污染已成为老百姓心中的痛点。现代都市人80%以上的时间是在室内度过,以甲醛、苯系物为代表的挥发性有机物(VOC)污染和细菌为代表的微生物污染,严重危害人们的健康。目前,市场上的光触媒只有在短波长强光作用下,才能有效地降解甲醛等,在室内或者无光环境下,难以发挥降解效果。
日本光催化之父藤岛昭指出:如果想在室内使用光触媒,较弱的可见光无法有效降解VOC。为了克服该难题,本发明提供了一种性能优越的催化剂,以此实现无光降解VOC的技术效果。
发明内容
本发明的目的在于提供一种无光催化降解VOC的催化剂及制备工艺、制备装置,解决了如何在无光条件下降解VOC的技术问题,在室内或者无光环境下,可以发挥降解效果。
一种无光催化降解VOC的催化剂,该催化剂为C-M1Ox-M2Oy-M3NPs,其中,x、y分别代表催化剂中M1Ox、M2Oy的质量百分含量,x、y数值随着催化剂基材而不同,且50%<x+y<60%;
其中,M1Ox为第一助催化剂,M2Oy为第二助催化剂,C表示催化剂TiO2,M3NPs是金属纳米颗粒。
M1Ox的含量为45%<x<55%,具体的元素为Al、Ca、Fe中的任意一种;
M2Oy的含量为5%<y<15%,具体的元素为Co、Ni、Ce中的任意一种;
M3NPs是Ag纳米颗粒,且含量为5%。
一种无光催化降解VOC的催化剂制备工艺,具体步骤包括:
步骤S1:利用分子组装、催化链转移聚合和多级热处理技术构筑有机-无机有序复合光催化材料,获得催化剂C-M1Ox-M2Oy-M3NPs;
步骤S2:对所制备的光催化剂进行催化测试表征,构建催化强度与用量之间的内在关系。
所述步骤S1中,在分子组装时,将四氯化钛和碱性金属氧化物M1Ox-M2Oy反应,利用酸碱性质的剧烈反应,实现在微碱性的PH条件下完成三种纳米粒子选择性自我组装过程;
在催化链转移聚合时,用丙烯酸改性的硝酸银加入分子组装完成的体系中,再添入AIBN光引发剂,无氧状态下光照反应10小时,结束后,分离干燥得到固体;
在进行多级热处理时,将得到的固体组分分别进行烘干,热分解,热焙烧,最后通入氢气源进行活化再生处理。
所述多级热处理的具体步骤如下:
(1)将细化颗粒在300~350℃的低温下,且氮气气体氛围下维持2~5小时;
(2)在步骤(1)的基础上,于450~550℃的温度下维持3~5小时;
(3)在步骤(2)的基础上,于1000~1200℃维持1~2小时,然后缓慢降温;
(4)在步骤(3)的基础上,将得到的颗粒研磨球化;
(5)在步骤(4)的基础上,于管式炉中维持450~550℃下通入氢气,进行催化剂活化处理。
所述步骤S2中,在催化剂的测试表征时,观察XPS的元素价态和氢气的TPR氧空位,通过物理吸附仪测试催化剂的吸附量,利用BET测试法测量催化剂的比表面积,通过氮气吸附脱附来测试孔隙率。
其中,XPS表示X射线光电子谱。
一种无光催化降解VOC的催化剂制备装置,包括制备平台、设置在所述制备平台上的无氧室结构和加热***,所述无氧室结构和所述加热***之间设置有固液分离器;
所述无氧室结构和所述加热***均连接氮气瓶,所述加热***连接氢气源,所述固液分离器设置在空腔一上方,所述空腔一与所述加热***连通。
所述无氧室结构包括设置在所述制备平台上的空腔二、一端铰接在所述空腔二上边沿的转动板、设置在所述转动板外侧的胶囊,所述转动板上设置有通孔,所述通孔与所述胶囊连通,所述胶囊上设置有出气管,所述出气管上设置有电磁阀;所述转动板的内侧面上设置有光源。
所述加热***包括加热炉、设置在所述加热炉上的炉盖,所述加热炉和所述炉盖设置在空腔三中,所述空腔三的上端开口处设置有上盖;
所述空腔三与所述氮气瓶、所述氢气源连通,所述空腔三与所述空腔一连通,所述空腔一的外端开口设置有封闭盖。
与现有技术相比,本发明的有益效果是:
(1)利用分子组装、溶剂热、多级热处理等技术构筑有机-无机有序复合催化材料(C-M1Ox-M2Oy-M3NPs),将该复合催化剂添加到涂层中,可以在高效降解VOC的同时,实现涂层的抗菌功能,有效杀死常见的球菌、杆菌、螺旋菌类,本发明制备的C-M1Ox-M2Oy-M3NPs复合催化剂具有能带窄、光电子传输性能好、光响应范围宽等特点,相比市场上的光触媒仅在强光和短波长光下才有功效,本催化剂产品光响应波长可以拓展到800 nm以上,在无光和弱光下依然可以实现降解VOC和抗菌目的。
(2)本发明主要应用领域包括内墙涂料、家具、汽车内饰,儿童玩具等,这种新型的三元复合催化剂能够通过室温、水汽以及光照降解VOC并达到杀菌目的,显著改善密闭空间内的空气质量,减少微生物污染,此复合催化剂的发展前景十分广阔,生态周期长。
(3)本发明设置的催化剂制备装置,将化学反应、加热和固液分离集成在一个制备平台上,其中加热***可以完成多个关于加热的程序,具有多功能技术效果,大大节约了设备的占地面积。
附图说明
图1是本发明实施例中催化剂制备装置的结构图一。
图2是本发明实施例中催化剂制备装置的结构图二。
其中:1、制备平台;2、封闭盖;21、空腔一;3、转动板;31、空腔二;4、胶囊;5、出气管;6、固液分离器;7、氮气瓶;71、管道一;72、管道二;8、上盖;81、空腔三;82、炉盖;83、加热炉;9、氢气源;91、管道三;10、无氧室结构;11、加热***。
具体实施方式
为了能更加清楚说明本发明的技术特点,下面通过具体实施方式,对本发明进行阐述。
一种无光催化降解VOC的催化剂,该催化剂为C-M1Ox-M2Oy-M3NPs,其中,x、y分别代表催化剂中M1Ox、M2Oy的质量百分含量,x、y数值随着催化剂基材而不同,且50%<x+y<60%;
其中,M1Ox为第一助催化剂,M2Oy为第二助催化剂,C表示催化剂TiO2,M3NPs是金属纳米颗粒。
M1Ox的含量为45%<x<55%,具体的元素为Al、Ca、Fe中的任意一种;
M2Oy的含量为5%<y<15%,具体的元素为Co、Ni、Ce中的任意一种;
M3NPs是Ag纳米颗粒,且含量为5%。
M1和M2的金属氧化物为助催剂,是用来提高催化剂的整体韧性,以及提升催化剂的整体活性并减缓中毒效应的发生与蔓延,所以选择一些物理强度高且化学性能强的金属氧化物。
M1Ox同时也是一种食品添加剂,它可在室温无光、一定湿度的条件下高效降解甲醛,是一种温和的氧化剂,十分环保。
M2Oy可在较弱太阳光强下降解甲醛。
M3NPs具有极佳的抗菌性能和表面等离子共振效应。
C-M1Ox-M2Oy-M3NPs除甲醛的作用机理:M3NPs具有的表面等离子体共振效应可以赋予M2Oy更广的吸光范围以及弱光利用性能,使得M2Oy可在0.01个太阳光光强下降解甲醛。即使夜晚无光条件下,M1Ox也可在室温、一定湿度的条件下降解甲醛。
一种无光催化降解VOC的催化剂制备工艺,具体步骤包括:
步骤S1:利用分子组装、催化链转移聚合和多级热处理技术构筑有机-无机有序复合光催化材料,获得催化剂C-M1Ox-M2Oy-M3NPs;
步骤S2:对所制备的光催化剂进行催化测试表征,构建催化强度与用量之间的内在关系。
涂层是内墙涂料,是将催化剂均匀混于涂料中,然后用于涂层粉刷。
步骤S1中,在分子组装时,将四氯化钛和碱性金属氧化物M1Ox-M2Oy反应,利用酸碱性质的剧烈反应,实现在微碱性的PH条件下完成三种纳米粒子选择性自我组装过程;
在催化链转移聚合时,用丙烯酸改性的硝酸银加入分子组装完成的体系中,再添入AIBN光引发剂,无氧状态下光照反应10小时,结束后,分离干燥得到固体;
在进行多级热处理时,将得到的固体组分分别进行烘干,热分解,热焙烧,最后通入氢气源9进行活化再生处理。
自我组装过程不需要其他操作就可实现,在此不再详述;
分离干燥得到固体这一操作中,用丙烯酸改性的硝酸银加入分子组装完成的体系,仍然是液体,此时需要离心机或过滤器来实现固液分离,由于催化剂在固体中,所以得到的湿润固体还需要进行干燥、研磨和细化的工序。
多级热处理的具体步骤如下:
(1)将细化颗粒在300~350℃的低温下,且氮气气体氛围下维持2~5小时;
(2)在步骤(1)的基础上,于450~550℃的温度下维持3~5小时;
(3)在步骤(2)的基础上,于1000~1200℃维持1~2小时,然后缓慢降温;
(4)在步骤(3)的基础上,将得到的颗粒研磨球化;
(5)在步骤(4)的基础上,于管式炉中维持450~550℃下通入氢气,进行催化剂活化处理。
步骤S2中,在催化剂的测试表征时,观察XPS的元素价态和氢气的TPR氧空位,通过物理吸附仪测试催化剂的吸附量,利用BET测试法测量催化剂的比表面积,通过氮气吸附脱附来测试孔隙率。其中,表1、表2和表3分别为本方案中提供的催化剂无光、弱光有光条件下催化降解VOC浓度表,从中可以看出,经过无光催化降解,VOC的浓度值均大幅度下降,部分污染物最终的残留量甚至达到可以忽略不计的程度,物理吸附仪的吸附量即允许排放浓度减去处理后浓度;此外可以看出,无光催化降解的效果接近或者基本与弱光、有光条件降解效果类似。
表1 催化剂无光条件下催化降解VOC的浓度表
表2 催化剂弱光条件下催化降解VOC的浓度表
表3 催化剂有光条件下催化降解VOC的浓度表
参见图1和图2,一种无光催化降解VOC的催化剂制备装置,包括制备平台1、设置在制备平台1上的无氧室结构10和加热***11,无氧室结构10和加热***11之间设置有固液分离器6;
无氧室结构10和加热***11均连接氮气瓶7,加热***11连接氢气源9,固液分离器6设置在空腔一21上方,空腔一21与加热***11连通。
无氧室结构10包括设置在制备平台1上的空腔二31、一端铰接在空腔二31上边沿的转动板3、设置在转动板3外侧的胶囊4,转动板3上设置有通孔,通孔与胶囊4连通,胶囊4上设置有出气管5,出气管5上设置有电磁阀,转动板3的内侧面上设置有光源。
加热***11包括加热炉83、设置在加热炉83上的炉盖82,加热炉83和炉盖82设置在空腔三81中,空腔三81的上端开口处设置有上盖8;
空腔三81与氮气瓶7、氢气源9连通,空腔三81与空腔一21连通,空腔一21的外端开口设置有封闭盖2。
其中,氮气瓶7通过管道一71与所述空腔二31连接,通过管道二72与空腔三81连接,氢气源9通过管道三91与空腔三81连接,管道上可以设置电磁阀来控制通断。
本发明的具体工作过程:
在分子组装时,将四氯化钛和碱性金属氧化物M1Ox-M2Oy反应,利用酸碱性质的剧烈反应,实现在微碱性的PH条件下完成三种纳米粒子选择性自我组装过程,此时,可以将该反应过程放置在空腔二31中进行,在转动板3的封闭作用下,此时打开胶囊4上的出气管5,可以起到防护的效果,避免人们因为酸碱剧烈反应而受到身体上的伤害;
在催化链转移聚合时,用丙烯酸改性的硝酸银加入分子组装完成的体系中,再添入AIBN光引发剂,无氧状态下光照反应10小时,结束后,分离干燥得到固体;为了产生无氧的环境,打开氮气瓶7,盖合转动板3,打开胶囊4上的出气管5,源源不断的氮气进入空腔二31中,并将氧气排出,关闭出气管5上的电磁阀,继续通入氮气,直到胶囊4鼓起并达到一定的体积,关闭氮气瓶7,可知空腔二31中已经基本处于无氧环境,打开转动板3上的光源,进行光照反应,由于长达10小时,因此,空腔二31中的氮气可能会逸散,此时根据胶囊4的体积大小可以判断出来,当胶囊4的体积减小时,再次打开氮气瓶7,通入氮气,如此往复;
光照反应结束后,需要分离干燥固体,此时需要离心机或过滤器来实现固液分离,即本发明中的固液分离器6,将光照反应产物置于固液分离器6中即可,待分离完毕,所得到的湿润固体还需要进行干燥、研磨和细化的工序,其中在干燥程序中,使得空腔一21与空腔三81连通即可,加热炉83中的热量进入到空腔一21中,并与固液分离器6接触,实现了干燥过程,方便快捷,节省能源;
在进行多级热处理时,将得到的固体组分分别进行烘干,热分解,热焙烧,最后通入氢气源9进行活化再生处理。
本发明未经描述的技术特征可以通过或采用现有技术实现,在此不再赘述,当然,上述说明并非是对本发明的限制,本发明也并不仅限于上述举例,本技术领域的普通技术人员在本发明的实质范围内所做出的变化、改型、添加或替换,也应属于本发明的保护范围。
Claims (9)
1.一种无光催化降解VOC的催化剂,其特征在于,该催化剂为
C-M1Ox-M2Oy-M3NPs,其中,x、y分别代表催化剂中M1Ox、M2Oy的质量百分含量,x、y数值随着催化剂基材而不同,且50%<x+y<60%;
其中,M1Ox为第一助催化剂,M2Oy为第二助催化剂,C表示催化剂TiO2,M3NPs是金属纳米颗粒。
2.根据权利要求1所述的无光催化降解VOC的催化剂,其特征在于,M1Ox的含量为45%<x<55%,具体的元素为Al、Ca、Fe中的任意一种;
M2Oy的含量为5%<y<15%,具体的元素为Co、Ni、Ce中的任意一种;
M3NPs是Ag纳米颗粒,且含量为5%。
3.一种无光催化降解VOC的催化剂制备工艺,其特征在于,具体步骤包括:
步骤S1:利用分子组装、催化链转移聚合和多级热处理技术构筑有机-无机有序复合光催化材料,获得催化剂C-M1Ox-M2Oy-M3NPs;
步骤S2:对所制备的光催化剂进行催化测试表征,构建催化强度与用量之间的内在关系。
4.根据权利要求3所述的无光催化降解VOC的催化剂制备工艺,其特征在于,所述步骤S1中,在分子组装时,将四氯化钛和碱性金属氧化物M1Ox-M2Oy反应,利用酸碱性质的剧烈反应,实现在微碱性的PH条件下完成三种纳米粒子选择性自我组装过程;
在催化链转移聚合时,用丙烯酸改性的硝酸银加入分子组装完成的体系中,再添入AIBN光引发剂,无氧状态下光照反应10小时,结束后,分离干燥得到固体;
在进行多级热处理时,将得到的固体组分分别进行烘干,热分解,热焙烧,最后通入氢气源(9)进行活化再生处理。
5.根据权利要求4所述的无光催化降解VOC的催化剂制备工艺,其特征在于,所述多级热处理的具体步骤如下:
(1)将细化颗粒在300~350℃的低温下,且氮气气体氛围下维持2~5小时;
(2)在步骤(1)的基础上,于450~550℃的温度下维持3~5小时;
(3)在步骤(2)的基础上,于1000~1200℃维持1~2小时,然后缓慢降温;
(4)在步骤(3)的基础上,将得到的颗粒研磨球化;
(5)在步骤(4)的基础上,于管式炉中维持450~550℃下通入氢气,进行催化剂活化处理。
6.根据权利要求5所述的无光催化降解VOC的催化剂制备工艺,其特征在于,所述步骤S2中,在催化剂的测试表征时,观察XPS的元素价态和氢气的TPR氧空位,通过物理吸附仪测试催化剂的吸附量,利用BET测试法测量催化剂的比表面积,通过氮气吸附脱附来测试孔隙率。
7.一种无光催化降解VOC的催化剂制备装置,其特征在于,包括制备平台(1)、设置在所述制备平台(1)上的无氧室结构(10)和加热***(11),所述无氧室结构(10)和所述加热***(11)之间设置有固液分离器(6);
所述无氧室结构(10)和所述加热***(11)均连接氮气瓶(7),所述加热***(11)连接氢气源(9),所述固液分离器(6)设置在空腔一(21)上方,所述空腔一(21)与所述加热***(11)连通。
8.根据权利要求7所述的无光催化降解VOC的催化剂制备装置,其特征在于,所述无氧室结构(10)包括设置在所述制备平台(1)上的空腔二(31)、一端铰接在所述空腔二(31)上边沿的转动板(3)、设置在所述转动板(3)外侧面上的胶囊(4),所述转动板(3)上设置有通孔,所述通孔与所述胶囊(4)连通,所述胶囊(4)上设置有出气管(5),所述出气管(5)上设置有电磁阀;
所述转动板(3)的内侧面上设置有光源。
9.根据权利要求8所述的无光催化降解VOC的催化剂制备装置,其特征在于,所述加热***(11)包括加热炉(83)、设置在所述加热炉(83)上的炉盖(82),所述加热炉(83)和所述炉盖(82)设置在空腔三(81)中,所述空腔三(81)的上端开口处设置有上盖(8);
所述空腔三(81)与所述氮气瓶(7)、所述氢气源(9)连通,所述空腔三(81)与所述空腔一(21)连通,所述空腔一(21)的外端开口设置有封闭盖(2)。
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