CN111908937A - 一种VOCs净化催化剂用蜂窝陶瓷载体及其制备方法 - Google Patents
一种VOCs净化催化剂用蜂窝陶瓷载体及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种VOCs净化催化剂用蜂窝陶瓷载体的制备方法,包括以下步骤:(1)粉体原料配制;(2)泥料制备;(3)泥坯制备;(4)挤出成型;(5)干燥定型;(6)坯体加工;(7)高温烧成。本发明制得的蜂窝陶瓷载体具有催化剂浆料涂覆上载量高且涂层脱落率低的优点,可用于VOCs净化催化剂涂覆。
Description
技术领域
本发明属于有机废气净化处理领域,尤其是涉及一种VOCs净化催化剂用蜂窝陶瓷载体的制备方法。
背景技术
挥发性有机物(VOCs)是指常温下饱和蒸气压大于70Pa,常压下沸点在260℃以内的有机化合物,在工业生产中主要产生于石油石化、机械涂装、印刷、油漆涂料、电子等行业,主要成分为苯、甲苯、二甲苯及非甲烷总烃等物质,这些物质进入大气候经过光化学作用形成二次有机气溶胶,是产生雾霾的主要原因之一。此类物质大部分都具有致癌、致畸、致突变、引发中毒死亡,对环境和人体健康造成巨大的危害。
目前,VOCs有机废气处理方法主要有吸附法、吸收法、冷凝回收法、直接燃烧法、等离子体法、光催化法和催化燃烧法等,目前国内VOCs废气处理以催化燃烧法为主,以Pt、Pd、Rh等贵金属为活性组分,堇青石蜂窝陶瓷为载体。目前用于工业废气净化处理的蜂窝陶瓷载体的催化剂浆料一次上载量不高,高上载量需要多次涂覆工艺,而且涂层上载量太高容易龟裂、脱落,直接影响催化活性。CN102872920A公开的方法中,采用对蜂窝陶瓷载体进行超声预处理的方法,预处理后的蜂窝陶瓷载体负载涂层、干燥和焙烧,涂覆活性金属组分制备成催化剂。解决了涂层易龟裂和脱落的问题,但是需要严格控制超声处理的时间及频率,否则会导致孔壁塌陷,尤其是不同强度的载体材料,对超声处理要求太高,不利于大规模工业化生产。
发明内容
本发明的目的在于提供一种涂覆性优异的VOCs净化催化剂用蜂窝陶瓷载体的制备方法。
为了解决以上技术问题,本发明采用的具体技术方案如下:
一种VOCs净化催化剂用蜂窝陶瓷载体的制备方法,其特征在于包括以下步骤:
步骤一,粉体原料配制:将平均粒径4μm的6~8wt%片状生高岭土、平均粒径3μm的22~24wt%煅烧高岭土、平均粒径15μm的35~45wt%片状滑石、平均粒径1μm的15~20wt%氢氧化铝和平均粒径5μm的10~15wt%熔融硅微粉混合均匀,得混合物I,再称取混合物I总重量5~10%绿豆淀粉、2~3wt%甲基纤维素混合均匀,得到混合物Ⅱ;
步骤二,泥料制备:将步骤一得到的粉体混合物Ⅱ放入捏合机中进行揉搓,再加入上述混合物Ⅱ总重量0.5~1.0wt%油酸、2.0~4.0wt%大豆油和28~32wt%水,粉体原料逐渐变成具有可塑性的泥块即完成泥料制备;
步骤三,泥坯制备:将步骤二得到的泥料放入真空练泥机中进行真空练泥,练泥过程中真空度为-0.095MPa,得到与成型机料筒规格匹配的泥坯;
步骤四,挤出成型:将步骤三得到的泥坯放入真空挤出机中,通过模具挤出边长为150*150mm、目数为300目的蜂窝陶瓷素坯;
步骤五,干燥定型:将步骤四得到的蜂窝陶瓷素坯放入微波网带炉中进行微波干燥,直到干燥完成坯体中的含水率≤2%,将干燥后的坯体冷却至室温;
步骤六,坯体加工:将步骤五得到的干燥后的坯体按照烧成收缩比例放尺后,将两端多余部分切割掉,并用压缩空气将切割后坯体孔道中残留的粉尘吹扫干净;
步骤七,高温烧成:将步骤六得到的加工好的蜂窝陶瓷素坯放入窑炉中进行烧成,烧成周期为80~110小时,烧成温度为1390~1410℃,保温时间为4~6小时,得到尺寸为150*150*200mm的蜂窝陶瓷载体。
所述的蜂窝陶瓷载体,所述绿豆淀粉平均粒径为10-15μm。
与现有技术相比本发明具有如下有益效果:本发明制备出的蜂窝陶瓷载体具有催化剂浆料涂覆上载量高且涂层脱落率低的优点。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明了,下面结合具体实施方式,对本发明进一步详细说明。应该理解,这些描述只是示例性的,而并非要限制本发明的范围。
对比例
步骤一,粉体原料配制:将平均粒径4μm的6~8wt%片状生高岭土、平均粒径3μm的22~24wt%煅烧高岭土、平均粒径15μm的35~45wt%片状滑石、平均粒径1μm的15~20wt%氢氧化铝和平均粒径5μm的10~15wt%熔融硅微粉均匀混合,得混合物I,再称取混合物I总重量2~3wt%甲基纤维素均匀混合;
步骤二,泥料制备:将步骤一混合均匀的粉体原料放入捏合机中进行揉搓,再加入上述粉体原料总重量0.5~1.0wt%油酸、2.0~4.0wt%大豆油和28~32wt%水,粉体原料逐渐变成具有可塑性的泥块即完成泥料制备;
步骤三,泥坯制备:将步骤二得到的泥块放入真空练泥机中进行真空练泥,练泥过程中真空度为-0.095MPa,得到与成型机料筒规格匹配的泥坯;
步骤四,挤出成型:将步骤三得到的泥坯放入真空挤出机中,通过模具挤出边长为150*150mm、目数为300目的蜂窝陶瓷素坯;
步骤五,干燥定型:将步骤四得到的蜂窝陶瓷素坯放入微波网带炉中进行微波干燥,直到干燥完成坯体中的含水率≤2%,将干燥后的坯体冷却至室温;
步骤六,坯体加工:将步骤五得到的干燥后的坯体按照烧成收缩比例放尺后,将两端多余部分切割掉,并用压缩空气将切割后坯体孔道中残留的粉尘吹扫干净;
步骤七,高温烧成:将步骤六得到的加工好的蜂窝陶瓷素坯放入窑炉中进行烧成,烧成周期为80~110小时,烧成温度为1390~1410℃,保温时间为4~6小时,得到尺寸为150*150*200mm的蜂窝陶瓷载体。
实施例1:
步骤一,粉体原料配制:将平均粒径4μm的6wt%片状生高岭土、平均粒径3μm的24wt%煅烧高岭土、平均粒径15μm的35wt%片状滑石、平均粒径1μm的18wt%氢氧化铝和平均粒径5μm的15wt%熔融硅微粉均匀混合,得混合物I,再称取混合物I总重量平均粒径15μm的5%绿豆淀粉、3wt%甲基纤维素均匀混合,得到混合物Ⅱ;
步骤二,泥料制备:将步骤一得到的粉体混合物Ⅱ放入捏合机中进行揉搓,再加入上述混合物Ⅱ总重量1.0wt%油酸、4.0wt%大豆油和28wt%水,粉体原料逐渐变成具有可塑性的泥块即完成泥料制备;
步骤三,泥坯制备:将步骤二得到的泥块放入真空练泥机中进行真空练泥,练泥过程中真空度为-0.095MPa,得到与成型机料筒规格匹配的泥坯;
步骤四,挤出成型:将步骤三得到的泥坯放入真空挤出机中,通过模具挤出边长为150*150mm、目数为300目的蜂窝陶瓷素坯;
步骤五,干燥定型:将步骤四得到的蜂窝陶瓷素坯放入微波网带炉中进行微波干燥,直到干燥完成坯体中的含水率≤2%,将干燥后的坯体冷却至室温;
步骤六,坯体加工:将步骤五得到的干燥后的坯体按照烧成收缩比例放尺后,将两端多余部分切割掉,并用压缩空气将切割后坯体孔道中残留的粉尘吹扫干净;
步骤七,高温烧成:将步骤六得到的加工好的蜂窝陶瓷素坯放入窑炉中进行烧成,烧成周期为80小时,烧成温度为1410℃,保温时间为4小时,得到尺寸为150*150*200mm的蜂窝陶瓷载体。
实施例2:
步骤一,粉体原料配制:将平均粒径4μm的7wt%片状生高岭土、平均粒径3μm的23wt%煅烧高岭土、平均粒径15μm的40wt%片状滑石、平均粒径1μm的15wt%氢氧化铝和平均粒径5μm的12wt%熔融硅微粉均匀混合,得混合物I,再称取混合物I总重量平均粒径12μm的8%绿豆淀粉、2wt%甲基纤维素均匀混合,得到混合物Ⅱ;
步骤二,泥料制备:将步骤一得到的粉体混合物Ⅱ放入捏合机中进行揉搓,再加入上述混合物Ⅱ总重量0.8wt%油酸、3.0wt%大豆油和30wt%水,粉体原料逐渐变成具有可塑性的泥块即完成泥料制备;
步骤三,泥坯制备:将步骤二得到的泥块放入真空练泥机中进行真空练泥,练泥过程中真空度为-0.095MPa,得到与成型机料筒规格匹配的泥坯;
步骤四,挤出成型:将步骤三得到的泥坯放入真空挤出机中,通过模具挤出边长为150*150mm、目数为300目的蜂窝陶瓷素坯;
步骤五,干燥定型:将步骤四得到的蜂窝陶瓷素坯放入微波网带炉中进行微波干燥,直到干燥完成坯体中的含水率≤2%,将干燥后的坯体冷却至室温;
步骤六,坯体加工:将步骤五得到的干燥后的坯体按照烧成收缩比例放尺后,将两端多余部分切割掉,并用压缩空气将切割后坯体孔道中残留的粉尘吹扫干净;
步骤七,高温烧成:将步骤六得到的加工好的蜂窝陶瓷素坯放入窑炉中进行烧成,烧成周期为100小时,烧成温度为1400℃,保温时间为5小时,得到尺寸为150*150*200mm的蜂窝陶瓷载体。
实施例3:
步骤一,粉体原料配制:将平均粒径4μm的8wt%片状生高岭土、平均粒径3μm的22wt%煅烧高岭土、平均粒径15μm的45wt%片状滑石、平均粒径1μm的20wt%氢氧化铝和平均粒径5μm的10wt%熔融硅微粉均匀混合,得混合物I,再称取混合物I总重量平均粒径10μm的10%绿豆淀粉、3wt%甲基纤维素均匀混合,得到混合物Ⅱ;
步骤二,泥料制备:将步骤一得到的粉体混合物Ⅱ放入捏合机中进行揉搓,再加入上述混合物Ⅱ总重量0.5wt%油酸、2.00wt%大豆油和32wt%水,粉体原料逐渐变成具有可塑性的泥块即完成泥料制备;
步骤三,泥坯制备:将步骤二得到的泥块放入真空练泥机中进行真空练泥,练泥过程中真空度为-0.095MPa,得到与成型机料筒规格匹配的泥坯;
步骤四,挤出成型:将步骤三得到的泥坯放入真空挤出机中,通过模具挤出边长为150*150mm、目数为300目的蜂窝陶瓷素坯;
步骤五,干燥定型:将步骤四得到的蜂窝陶瓷素坯放入微波网带炉中进行微波干燥,直到干燥完成坯体中的含水率≤2%,将干燥后的坯体冷却至室温;
步骤六,坯体加工:将步骤五得到的干燥后的坯体按照烧成收缩比例放尺后,将两端多余部分切割掉,并用压缩空气将切割后坯体孔道中残留的粉尘吹扫干净;
步骤七,高温烧成:将步骤六得到的加工好的蜂窝陶瓷素坯放入窑炉中进行烧成,烧成周期为110小时,烧成温度为1390℃,保温时间为6小时,得到尺寸为150*150*200mm的蜂窝陶瓷载体。
将对比例和实施例1-3所得到的成品测试浆料上载量和涂层脱落率,实验结果如表1所示。
表1利用本发明方法制得的蜂窝陶瓷载体测试结果
经过试验论证,通过加入具有特定粒径的绿豆淀粉,使得蜂窝陶瓷载体的催化剂浆料上载量明显提高,而脱落率明显降低。
尽管已经详细描述了本发明的实施方式,但是应该理解的是,在不偏离本发明的精神和范围的情况下,可以对本发明的实施方式做出各种改变、替换和变更。
Claims (2)
1.一种VOCs净化催化剂用蜂窝陶瓷载体的制备方法,其特征在于,包括以下步骤:
步骤一,粉体原料配制:将平均粒径4μm的6~8wt%片状生高岭土、平均粒径3μm的22~24wt%煅烧高岭土、平均粒径15μm的35~45wt%片状滑石、平均粒径1μm的15~20wt%氢氧化铝和平均粒径5μm的10~15wt%熔融硅微粉混合均匀,得混合物I,再称取混合物I总重量5~10%绿豆淀粉、2~3wt%甲基纤维素混合均匀,得到混合物Ⅱ;
步骤二,泥料制备:将步骤一得到的粉体混合物Ⅱ放入捏合机中进行揉搓,再加入上述混合物Ⅱ总重量0.5~1.0wt%油酸、2.0~4.0wt%大豆油和28~32wt%水,粉体原料逐渐变成具有可塑性的泥块即完成泥料制备;
步骤三,泥坯制备:将步骤二得到的泥料放入真空练泥机中进行真空练泥,练泥过程中真空度为-0.095MPa,得到与成型机料筒规格匹配的泥坯;
步骤四,挤出成型:将步骤三得到的泥坯放入真空挤出机中,通过模具挤出边长为150*150mm、目数为300目的蜂窝陶瓷素坯;
步骤五,干燥定型:将步骤四得到的蜂窝陶瓷素坯放入微波网带炉中进行微波干燥,直到干燥完成坯体中的含水率≤2%,将干燥后的坯体冷却至室温;
步骤六,坯体加工:将步骤五得到的干燥后的坯体按照烧成收缩比例放尺后,将两端多余部分切割掉,并用压缩空气将切割后坯体孔道中残留的粉尘吹扫干净;
步骤七,高温烧成:将步骤六得到的加工好的蜂窝陶瓷素坯放入窑炉中进行烧成,烧成周期为80~110小时,烧成温度为1390~1410℃,保温时间为4~6小时,得到尺寸为150*150*200mm的蜂窝陶瓷载体。
2.如权利要求1所述的蜂窝陶瓷载体,其特征在于,所述绿豆淀粉平均粒径为10-15μm。
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