CN115007166A - 一种颗粒状催化燃烧co催化剂的制备方法 - Google Patents
一种颗粒状催化燃烧co催化剂的制备方法 Download PDFInfo
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Abstract
本发明实施例提供了一种颗粒状催化燃烧CO催化剂的制备方法,包括以下步骤:按照一定比例将硝酸铜、硝酸钴、硝酸锌、七钼酸铵溶解于去离子水中;恒温条件下加入一定量的尿素,维持pH值为6‑8并搅拌3h,得到混合物;将混合物转移到200℃的马弗炉中,分解得到疏松多孔的灰黑色产物,升温至300℃焙烧2h,得到复合氧化物粉体;将凹凸棒土、粘结剂、造孔剂和复合氧化物粉体按一定比例充分混合均匀得到混合料,加水搅拌6h,得到泥料;所述泥料经过混练后,使用定制模具挤成直径为3mm的长条,干燥后于500℃下焙烧4h,破碎成长度为2‑3cm的短棒,得到该催化剂。本发明能够有效提高CO与催化剂的接触面积,保证催化效率。
Description
技术领域
本发明涉及催化剂技术领域,具体而言,涉及一种颗粒状催化燃烧CO催化剂的制备方法。
背景技术
一氧化碳(CO)是一种无色、无臭、无刺激性的有毒气体。主要来源于煤、石油、天然气和生物质原料不完全燃烧,在很多工业排放气如高炉气、转炉气、电石炉气中含量较高,可达上万ppm。随着社会的发展,煤和石油等燃料的消耗量持续增长,一氧化碳的排放量也随之增多,加重了城市的大气污染。CO的催化氧化是一种消除CO的有效方法,而催化剂是该工艺的研究重点。因此,提供一种一氧化碳催化燃烧催化剂,能够在常温或一定温度下将CO催化氧化成CO2,成为了本领域技术人员亟待解决的问题。目前的一氧化碳催化燃烧催化剂存在接触面积小,催化效率低等缺陷。
发明内容
本发明实施例的目的在于提供一种颗粒状催化燃烧CO催化剂的制备方法,旨在有效提高CO与催化剂的接触面积,保证催化效率,同时降低了阻力。
本发明实施例提供的一种颗粒状催化燃烧CO催化剂的制备方法,包括以下步骤:
S10:按照一定比例,将硝酸铜、硝酸钴、硝酸锌、七钼酸铵溶解于去离子水中;
S20:恒温条件下,逐渐加入一定量的尿素,维持pH值为6-8,并搅拌3h,得到混合物;
S30:将所述混合物转移到200℃的马弗炉中,使所述混合物分解得到疏松多孔的灰黑色产物,然后升温至300℃焙烧2h,得到复合氧化物粉体;
S40:将凹凸棒土、粘结剂、造孔剂和所述复合氧化物粉体按一定比例充分混合均匀得到混合料,然后加水搅拌6h,得到泥料;
S50:所述泥料经过混练后,使用定制模具挤成直径为3mm的长条,干燥后于500℃下焙烧4h,破碎成长度为2-3cm的短棒,得到该催化剂。
进一步地,所述硝酸铜、硝酸钴、硝酸锌、七钼酸铵的摩尔比为(1-2):(0.5-1):(1-3):(0.05-0.5)。
进一步地,所述粘结剂为羧甲基纤维素、羟丙基甲基纤维素、预糊化淀粉、田菁粉的一种或多种。
进一步地,所述造孔剂为长度为1.5-3mm的有机纤维丝。
进一步地,所述复合氧化物粉体、凹凸棒土、粘结剂、造孔剂和水的比例为(2-3):(5-7):(0.005-0.01):(0.1-0.5):(4-8)。
本发明的有益效果是:
本发明实施例提供了一种颗粒状催化燃烧CO催化剂的制备方法,首先将制备的混合物进行分解焙烧得到复合氧化物粉体,再将凹凸棒土、粘结剂、造孔剂和所述复合氧化物粉体充分混合均匀得到混合料,再进行搅拌、混练、干燥和破碎后得到催化剂。通过采取复合金属为活性组分,在成型过程中加入造孔剂,得到具有宏观孔道颗粒状的催化剂,从而能够有效提高接触面积和催化效率,并降低阻力。
为使本发明的上述目的、特征和优点能更明显易懂,下文特举较佳实施例,作详细说明如下。
具体实施方式
为使本发明实施方式的目的、技术方案和优点更加清楚,下面将对本发明实施方式中的技术方案进行清楚、完整地描述,显然,所描述的实施方式是本发明的一部分实施方式,而不是全部的实施方式。基于本发明中的实施方式,本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其他实施方式,都属于本发明保护的范围。因此,以下对本发明的实施方式的详细描述并非旨在限制要求保护的本发明的范围,而是仅仅表示本发明的选定实施方式。
实施例1
本发明实施例提供的一种颗粒状催化燃烧CO催化剂的制备方法,可以包括以下步骤:
步骤S10:将250g硝酸铜、150g硝酸钴、300g硝酸锌、65g七钼酸铵溶解于2000g去离子水中。
步骤S20:恒温条件下,逐渐加入一定量的尿素,维持pH值为6-8,高速搅拌3h,得到混合物。
步骤S30:将所述混合物转移到200℃的马弗炉中,使混合物分解得到疏松多孔的灰黑色产物,然后升温至300℃焙烧2h,得到复合氧化物粉体。
步骤S40:将200g复合氧化物粉体、500g凹凸棒土、0.5g羟丙基甲基纤维素、10g有机纤维丝按一定比例充分混合均匀得到混合料,然后加400g水高速搅拌6h,得到泥料;
步骤S50:所得泥料经过混练后,使用定制模具挤成直径为3mm的长条,将湿胚体干燥后500℃焙烧4h,破碎成长度为2-3cm的短棒,得到该催化剂。
实施例2
本发明实施例提供的一种颗粒状催化燃烧CO催化剂的制备方法,可以包括以下步骤:
步骤S10:将250g硝酸铜、150g硝酸钴、300g硝酸锌、65g七钼酸铵溶解于2000g去离子水中。
步骤S20:恒温条件下,逐渐加入一定量的尿素,维持pH值为6-8,高速搅拌3h,得到混合物。
步骤S30:将所述混合物转移到200℃的马弗炉中,使混合物分解得到疏松多孔的灰黑色产物,然后升温至300℃焙烧2h,得到复合氧化物粉体。
步骤S40:将300g复合氧化物粉体、700g凹凸棒土、1g羟丙基甲基纤维素、50g有机纤维丝按一定比例充分混合均匀得到混合料,然后加800g水高速搅拌6h,得到泥料;
步骤S50:所得泥料经过混练后,使用定制模具挤成直径为3mm的长条,将湿胚体干燥后500℃焙烧4h,破碎成长度为2-3cm的短棒,得到该催化剂。
实施例3
本发明实施例提供的一种颗粒状催化燃烧CO催化剂的制备方法,可以包括以下步骤:
步骤S10:将200g硝酸铜、140g硝酸钴、700g硝酸锌、300g七钼酸铵溶解于2000g去离子水中。
步骤S20:恒温条件下,逐渐加入一定量的尿素,维持pH值为6-8,高速搅拌3h,得到混合物。
步骤S30:将所述混合物转移到200℃的马弗炉中,使混合物分解得到疏松多孔的灰黑色产物,然后升温至300℃焙烧2h,得到复合氧化物粉体。
步骤S40:将200g复合氧化物粉体、500g凹凸棒土、0.5g羟丙基甲基纤维素、10g有机纤维丝按一定比例充分混合均匀得到混合料,然后加400g水高速搅拌6h,得到泥料;
步骤S50:所得泥料经过混练后,使用定制模具挤成直径为3mm的长条,将湿胚体干燥后500℃焙烧4h,破碎成长度为2-3cm的短棒,得到该催化剂。
对比例
按照实施例1方法制备样品,区别在于成型过程中不添加有机纤维丝造孔。
对以上实施例制备的催化剂进行活性测试。分别将催化剂置于固定床反应器内,测试其催化氧化性能。原料气为含CO浓度8000mg/Nm3的空气,测试空速20000h-1,风速为2m/s,填料厚度20cm,压力为常压。
催化剂进行活性测试结果见表1。
表1
催化剂 | T<sub>10</sub>(转化率为10%的反应温度) | T<sub>98</sub>(转化率为98%的反应温度) | 压差 |
实施例1 | 117℃ | 182℃ | 0.997kpa |
实施例2 | 121℃ | 201℃ | 0.975kpa |
实施例3 | 107℃ | 170℃ | 1.013kpa |
对比例1 | 110℃ | 179℃ | 0.763kpa |
可见,本发明实施例提供的颗粒状催化燃烧CO催化剂具有更高的催化效率。
综上所述,本发明实施例提供了一种颗粒状催化燃烧CO催化剂的制备方法,首先将制备的混合物进行分解焙烧得到复合氧化物粉体,再将凹凸棒土、粘结剂、造孔剂和所述复合氧化物粉体充分混合均匀得到混合料,再进行搅拌、混练、干燥和破碎后得到催化剂。通过采取复合金属为活性组分,在成型过程中加入造孔剂,得到具有宏观孔道颗粒状的催化剂,从而能够有效提高接触面积和催化效率,并降低阻力。
以上所述仅为本发明的优选实施方式而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (5)
1.一种颗粒状催化燃烧CO催化剂的制备方法,其特征在于,包括以下步骤:
S10:按照一定比例,将硝酸铜、硝酸钴、硝酸锌、七钼酸铵溶解于去离子水中;
S20:恒温条件下,逐渐加入一定量的尿素,维持pH值为6-8,并搅拌3h,得到混合物;
S30:将所述混合物转移到200℃的马弗炉中,使所述混合物分解得到疏松多孔的灰黑色产物,然后升温至300℃焙烧2h,得到复合氧化物粉体;
S40:将凹凸棒土、粘结剂、造孔剂和所述复合氧化物粉体按一定比例充分混合均匀得到混合料,然后加水搅拌6h,得到泥料;
S50:所述泥料经过混练后,使用定制模具挤成直径为3mm的长条,干燥后于500℃下焙烧4h,破碎成长度为2-3cm的短棒,得到该催化剂。
2.根据权利要求1所述的颗粒状催化燃烧CO催化剂的制备方法,其特征在于,所述硝酸铜、硝酸钴、硝酸锌、七钼酸铵的摩尔比为(1-2):(0.5-1):(1-3):(0.05-0.5)。
3.根据权利要求1所述的颗粒状催化燃烧CO催化剂的制备方法,其特征在于,所述粘结剂为羧甲基纤维素、羟丙基甲基纤维素、预糊化淀粉、田菁粉的一种或多种。
4.根据权利要求1所述的颗粒状催化燃烧CO催化剂的制备方法,其特征在于,所述造孔剂为长度为1.5-3mm的有机纤维丝。
5.根据权利要求1所述的颗粒状催化燃烧CO催化剂的制备方法,其特征在于,所述复合氧化物粉体、凹凸棒土、粘结剂、造孔剂和水的比例为(2-3):(5-7):(0.005-0.01):(0.1-0.5):(4-8)。
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