CN107670675A - 一种车用硫化锌尾气催化剂及其制备方法 - Google Patents
一种车用硫化锌尾气催化剂及其制备方法 Download PDFInfo
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- 239000005083 Zinc sulfide Substances 0.000 title claims abstract description 25
- 239000003054 catalyst Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
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- 239000004246 zinc acetate Substances 0.000 claims abstract description 5
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Abstract
本发明公开了一种车用硫化锌尾气催化剂及其制备方法,由钛钨粉、偏钒酸铵、铝溶胶、石墨、高锰酸钾、空心粉煤灰微珠、醋酸锌等原料制成,本发明采用钛钨粉进行选择性吸附氮化合物,通过钒盐催化反应氮氧化合物,并利用氧化石墨改性硫化锌,以提高光催化效率的方式增强对汽车尾气中的灰粉、有机污染以及其他污染物的吸附催化降解作用,同时催化剂制作简单,能起到汽车运行时处理汽车尾气、降低排放物有害成分、环保的作用,满足国家尾气排放标准,具有很好的经济环境效益。
Description
技术领域
本发明涉及汽车尾气处理技术领域,尤其涉及一种车用硫化锌尾气催化剂及其制备方法。
背景技术
随着人们生活水平的不断提高,汽车作为生活高水准的标志,正在快速的进入广大家庭。机动车数量的增加,不仅加速了有限化石燃料的枯竭,而且增加了温室气体二氧化碳等的排放,导致全球变暖加剧。汽车尾气的成分含有二氧化碳、一氧化碳、氮氧化物、油气、灰粉等物质,这些物质对环境的直接排放会给环境带来严重的污染。因此,提高机动车燃油效率和减少尾气中污染物的排放是解决能源危机和防止大气污染日趋恶化的重要手段。
目前,对汽车发动机尾气处理主要采用选择性催化还原(SCR)技术路线,国内也都采用SCR技术路线,利用SCR技术将尾气中氮氧化物脱除的方法来降低排放物有害成分。SCR技术已普遍应用在电厂等固定源烟气处理中,应用在汽车等振动源尾气处理上在国内还是刚刚开始。
硫化锌是Ⅱ-Ⅵ族非常重要的宽带隙半导体材料,作为光催化材料,它还具有绿色环保、成本低、化学稳定性好、电子-空穴对产率高等特性而被广泛使用。尤其在有机污染物降解、抗菌除尘、催化吸附等领域具有极高的使用潜力,作为汽车尾气催化剂的使用前景广阔。然而硫化锌在光降解过程中,跃迁至导带中的电子与价带中留下的空穴很容易复合,降低了硫化锌的催化降解能力,而且粉末态硫化锌的循环催化利用效率比较低。
空心粉煤灰微珠是一种高二氧化硅含量的工业固体废弃物,具有质轻、隔热、介电常数低、耐高低温、耐腐蚀、隔声、抗压强度高、分散性好、流动性好、热稳定性好、防水防火等优异功能,应用于建材、橡胶、电子及复合材料等领域可以发挥其原料丰富、变废为宝价格低廉的优势。
发明内容
本发明目的就是为了弥补已有技术的缺陷,提供一种车用硫化锌尾气催化剂及其制备方法。
本发明是通过以下技术方案实现的:
一种车用硫化锌尾气催化剂,通过以下方法制备:
(1)将钛钨粉、偏钒酸铵按质量比20-22:1混合后加入搅拌罐中,加水搅拌令充分混合,将搅拌好的混合液在120-150℃下旋蒸干燥,再将干燥物料送入焙烧炉内高温焙烧成粉末,过200-250目筛备用;
(2)将石墨和高锰酸钾按质量比1:6-7混合后在冰浴下以固液比1:18-22g/mL加入混合酸,再升温至50-55℃并搅拌反应8-10小时,最后依次向反应产物中加入混合酸0.04-0.05倍体积的30%过氧化氢溶液和1-1.25倍体积的36%盐酸溶液,搅拌反应90-120分钟,完成后将产物离心并洗涤至中性,在50-60℃真空环境下干燥48小时以上,得到预处理氧化石墨备用;
(3)按重量份称取空心粉煤灰微珠3-5份、预处理氧化石墨0.8-1份、二甲基亚砜20-22份、醋酸锌0.05-0.08份,先取空心粉煤灰微珠置于20-25倍于其质量的水中,升温至80-90℃搅拌均匀得到微珠悬浮液,再向其中加入预处理氧化石墨和二甲基亚砜,超声分散后,加入醋酸锌并再次进行超声分散,之后将混合体系置于高温反应釜中,在200-240℃下反应10-12小时,完成后将产物经离心水洗,在50-60℃真空环境下干燥至粉末状态,得硫化锌复合材料备用;
(4)将步骤1所得粉末、步骤3所得硫化锌复合材料以及铝溶胶按质量比(24-26):(3-5):(6-8)混合后溶于水中,以600-800转/分搅拌得匀浆溶液;
(5)将步骤4所得匀浆溶液按120-180g/L的量用涂覆机涂覆到催化剂载体上,再将载体送入高温焙烧炉中,在600-660℃下焙烧3-4小时,得本发明尾气催化剂。
所述步骤1中焙烧温度450-550℃,时间10-12小时。
所述步骤2中混合酸由98%硫酸和85%磷酸按体积比(8-8.5):(1-1.5)混合而成。
所述步骤3中两次超声分散的条件依次为32-35kHz下超声15-25分钟以及25-26kHz下超声5-10分钟。
所述步骤5中催化剂载体为堇青石质蜂窝陶瓷载体、SiC泡沫陶瓷载体、氧化铝蜂窝载体中的任意一种。
本发明的优点是:
本发明采用钛钨粉进行选择性吸附氮化合物,通过钒盐催化反应氮氧化合物,再利用具有良好导电性和超高比表面积的氧化石墨与硫化锌进行复合,不仅有利于污染物有机分子的吸附,而且还可以有效提高硫化锌材料的光吸收效率和光生电子-空穴对的分离效率,其石墨烯共轭结构与半导体材料界面间稳定的化学键合连接,有利于加速物质界面间电子转移,进而有效提高光催化效率,在此基础上将稳定性极强的空心粉煤灰微珠引入复合改性工艺中,令其搭载硫化锌/氧化石墨复合材料,极大增强了吸附固载能力,对汽车尾气中的灰粉、有机污染以及其他污染物都有极强的吸附催化作用,本发明汽车尾气催化剂制作简单,能起到汽车运行时处理汽车尾气、降低排放物有害成分、环保的作用,满足国家尾气排放标准,具有很好的经济环境效益。
具体实施方式
一种车用硫化锌尾气催化剂,通过以下方法制备:
(1)将钛钨粉、偏钒酸铵按质量比20:1混合后加入搅拌罐中,加水搅拌令充分混合,将搅拌好的混合液在120℃下旋蒸干燥,再将干燥物料送入焙烧炉内在450℃下焙烧10小时成粉末,过200目筛备用;
(2)将石墨和高锰酸钾按质量比1:6混合后在冰浴下以固液比1:18g/mL加入混合酸,再升温至50℃并搅拌反应8小时,其中混合酸由98%硫酸和85%磷酸按体积比8:1混合而成,最后依次向反应产物中加入混合酸0.04倍体积的30%过氧化氢溶液和1倍体积的36%盐酸溶液,搅拌反应90分钟,完成后将产物离心并洗涤至中性,在50℃真空环境下干燥48小时以上,得到预处理氧化石墨备用;
(3)按重量份称取空心粉煤灰微珠3份、预处理氧化石墨0.8份、二甲基亚砜20份、醋酸锌0.05份,先取空心粉煤灰微珠置于20倍于其质量的水中,升温至80℃搅拌均匀得到微珠悬浮液,再向其中加入预处理氧化石墨和二甲基亚砜,在32kHz下超声分散15分钟,加入醋酸锌并再次在25kHz下超声分散5分钟,之后将混合体系置于高温反应釜中,在200℃下反应10小时,完成后将产物经离心水洗,在50℃真空环境下干燥至粉末状态,得硫化锌复合材料备用;
(4)将步骤1所得粉末、步骤3所得硫化锌复合材料以及铝溶胶按质量比25:4:7混合后溶于水中,以600转/分搅拌得匀浆溶液;
(5)将步骤4所得匀浆溶液按120g/L的量用涂覆机涂覆到堇青石质蜂窝陶瓷载体上,再将载体送入高温焙烧炉中,在600℃下焙烧3小时,得本发明尾气催化剂。
Claims (5)
1.一种车用硫化锌尾气催化剂,其特征在于通过以下方法制备:
(1)将钛钨粉、偏钒酸铵按质量比20-22:1混合后加入搅拌罐中,加水搅拌令充分混合,将搅拌好的混合液在120-150℃下旋蒸干燥,再将干燥物料送入焙烧炉内高温焙烧成粉末,过200-250目筛备用;
(2)将石墨和高锰酸钾按质量比1:6-7混合后在冰浴下以固液比1:18-22g/mL加入混合酸,再升温至50-55℃并搅拌反应8-10小时,最后依次向反应产物中加入混合酸0.04-0.05倍体积的30%过氧化氢溶液和1-1.25倍体积的36%盐酸溶液,搅拌反应90-120分钟,完成后将产物离心并洗涤至中性,在50-60℃真空环境下干燥48小时以上,得到预处理氧化石墨备用;
(3)按重量份称取空心粉煤灰微珠3-5份、预处理氧化石墨0.8-1份、二甲基亚砜20-22份、醋酸锌0.05-0.08份,先取空心粉煤灰微珠置于20-25倍于其质量的水中,升温至80-90℃搅拌均匀得到微珠悬浮液,再向其中加入预处理氧化石墨和二甲基亚砜,超声分散后,加入醋酸锌并再次进行超声分散,之后将混合体系置于高温反应釜中,在200-240℃下反应10-12小时,完成后将产物经离心水洗,在50-60℃真空环境下干燥至粉末状态,得硫化锌复合材料备用;
(4)将步骤1所得粉末、步骤3所得硫化锌复合材料以及铝溶胶按质量比(24-26):(3-5):(6-8)混合后溶于水中,以600-800转/分搅拌得匀浆溶液;
(5)将步骤4所得匀浆溶液按120-180g/L的量用涂覆机涂覆到催化剂载体上,再将载体送入高温焙烧炉中,在600-660℃下焙烧3-4小时,得本发明尾气催化剂。
2.根据权利要求1所述的车用硫化锌尾气催化剂的制备方法,其特征在于,所述步骤1中焙烧温度450-550℃,时间10-12小时。
3.根据权利要求1所述的车用硫化锌尾气催化剂的制备方法,其特征在于,所述步骤2中混合酸由98%硫酸和85%磷酸按体积比(8-8.5):(1-1.5)混合而成。
4.根据权利要求1所述的车用硫化锌尾气催化剂的制备方法,其特征在于,所述步骤3中两次超声分散的条件依次为32-35kHz下超声15-25分钟以及25-26kHz下超声5-10分钟。
5.根据权利要求1所述的车用硫化锌尾气催化剂的制备方法,其特征在于,所述步骤5中催化剂载体为堇青石质蜂窝陶瓷载体、SiC泡沫陶瓷载体、氧化铝蜂窝载体中的任意一种。
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