CN106040242B - 一种膨润土基多孔材料负载氧化钴催化剂的制备方法 - Google Patents
一种膨润土基多孔材料负载氧化钴催化剂的制备方法 Download PDFInfo
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- 239000000440 bentonite Substances 0.000 title claims abstract description 48
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Abstract
本发明公开一种膨润土基多孔材料负载氧化钴催化剂的制备方法。依次包括如下步骤:将膨润土加入到八烷基三甲基溴化铵溶液中,在恒温搅拌、老化、离心分离,得到八烷基三甲基溴化铵改性的膨润土固体;将(3‑氨基丙基)三乙氧基硅烷、水杨醛和氯化钴按摩尔比1:1:1的量加入到乙醇中形成溶液,反应6~8h,加入八烷基三甲基溴化铵改性的膨润土固体,搅拌沉淀分离,形成含钴有机配合物柱撑膨润土;含产物置于马弗炉中,400~550℃下焙烧6~8h,其中的碳氮元素转化为气体溢出,形成孔道,得到氧化硅柱撑的膨润土基多孔材料负载氧化钴催化剂。该材料中的氧化钴均匀分布于三维孔道的孔壁上,对反应物有较好的吸附和催化效果。
Description
技术领域
本发明涉及一种膨润土基多孔材料负载氧化钴催化剂的制备方法,属于催化材料制备领域。
背景技术
氧化钴催化剂应用较广,例如乙烯和水煤气在钴催化剂作用下,可以得到醛和醇,新型钴基费托催化剂可用于合成长链烃和洁净能源(Chem.Rev.2007,107,1692-1744),负载型钴催化剂促进的不饱和脂肪酸酯中的双键过氧化(厦门大学学报(自然科学版),2010年,49卷,03期,373-380),以Al(OH)x为载体的氧化钴催化剂,在不使用大量溶剂的条件下进行环己烷和甲苯选择氧化,取得了很好的结果(催化学报,2004,25卷,11期,887-891)。另外在催化氧化一些难降解的污染物方面,也有较好的应用前景,比如:在室温下催化氧化甲醛、催化氧化环己烷等有机物(Catal.Commun.2005,6,211-214)。但在没有合适的载体的情况下,氧化钴的效率低;有研究用碳纳米管或介孔氧化硅(石油学报(石油加工),2011年01期、化学学报,2008年16期),但这些材料价格相对昂贵。另外,催化剂和载体之间的作用力如何,也会影响到催化效果,过弱则会出现催化剂脱落或被吸附到载体空洞中。
贵金属在众多催化反应中体现出优异性能,但由于其固有的稀缺特性和高昂成本,使贵金属替代研究成为国际催化领域的重要发展方向之一。低成本的铁、钴等过渡金属以合金、氧化物、碳化物等形式存在,这些化合物组成各异、晶相多样,有望通过精确设计在晶体生长阶段实现活性中心的表面富集,使其具有接近或超越贵金属的催化性能。
氧化钴催化剂应用较广,特别是在催化氧化一些难降解的污染物方面,有较好的应用前景,比如:在室温下催化氧化甲醛、催化氧化环己烷等有机物。但没有合适的载体,氧化钴的用量大,效率低;有研究用碳纳米管或介孔氧化硅,但这些材料价格相对昂贵。
膨润土是以蒙脱石(Montmorillonite)为主要矿物的粘土岩。蒙脱石是一种含水的层状铝硅酸盐矿物,由两个硅氧四面体中间夹一个铝(镁)氧(氢氧)八面体组成,属于2:1型的三层粘土矿物。晶层间距离为0.96~2.14nm,这些纳米片层团聚在一起,形成几百纳米到几微米的粘土颗粒。膨润土有很强的阳离子交换能力,在一定的物理-化学条件下,Ca2+、Mg2+、Na+、K+、Fe2+、Cu2+等可相互交换。该材料便宜廉价,在中国的储量排世界第一。
发明内容
本发明的目的是为克服现有技术载体价格高、活性低等不足,提供一种膨润土基多孔材料负载氧化钴催化剂的制备方法。
本发明采用的技术方案是依次包括如下步骤:
1)按照每克膨润土对应0.5~0.8mmol八烷基三甲基溴化铵的量,将过20-50目筛的膨润土加入到质量百分比浓度为0.1%~1%的八烷基三甲基溴化铵溶液中,在60~70℃恒温水浴中搅拌5~6h,老化12~24h,离心分离,去掉上清液,得到八烷基三甲基溴化铵改性的膨润土固体;
2)将(3-氨基丙基)三乙氧基硅烷、水杨醛和氯化钴按摩尔比1:1:1的量各2~4mol加入到20~40mL乙醇中形成溶液,在20~35℃下反应6~8h,加入八烷基三甲基溴化铵改性的膨润土固体,搅拌2~4h、沉淀分离,反应生成的含钴有机配合物在分配作用下,插入膨润土层间,形成含钴有机配合物柱撑膨润土;
3)将含钴有机配合物柱撑膨润土置于马弗炉中,400~550℃下焙烧6~8h,其中的碳氮元素转化为气体溢出,形成孔道,得到氧化硅柱撑的膨润土基多孔材料负载氧化钴催化剂。
本发明的优点是:
(1)将钴离子和有机物形成配合物,再利用有机膨润土对有机物的吸附效应,将钴元素均匀分布于膨润土层间。
(2)将含硅有机物和钴原子配合,插入膨润土层间,再经过高温煅烧,去除碳元素,留下硅等元素,形成多孔材料。
(3)利用膨润土层状结构,在膨润土层间插入硅元素,经过煅烧之后,硅元素形成氧化硅和负载的氧化钴一起形成柱撑,使整个结构为三维立体孔道结构。
具体实施方式
以下进一步提供本发明的3个实施例:
实施例1
按照每克膨润土对应0.8mmol八烷基三甲基溴化铵的量,将过50目筛的膨润土加入到质量百分比浓度为1%的八烷基三甲基溴化铵溶液中,在70℃恒温水浴中搅拌6h,老化24h,离心分离,去掉上清液,得到八烷基三甲基溴化铵改性的膨润土固体;将(3-氨基丙基)三乙氧基硅烷、水杨醛和氯化钴按摩尔比1:1:1的量各4mol加入到40mL乙醇中形成溶液,在35℃下反应8h,加入八烷基三甲基溴化铵改性的膨润土固体,搅拌4h、沉淀分离,反应生成的含钴有机配合物在分配作用下,插入膨润土层间,形成含钴有机配合物柱撑膨润土;将含钴配合物柱撑膨润土置于马弗炉中,550℃下焙烧8h,其中的碳氮等元素转化为气体溢出,形成孔道,得到氧化硅柱撑的膨润土基多孔材料负载氧化钴催化剂。
采用U形管(内径4mm)连续流动反应评价装置,称量100mg合成得到的膨润土基多孔材料负载氧化钴催化剂放置管中,调节空气的流速为20mL/min,空气流动带动甲醛气体进入U形管反应器中,每小时流过每升催化剂的气体体积(即空速)为6000h-1。在30℃条件下,该催化剂降解浓度为150ppm的甲醛气体,降解率为78%。
实施例2
按照每克膨润土对应0.5mmol八烷基三甲基溴化铵的量,将过20目筛的膨润土加入到质量百分比浓度为0.1%的八烷基三甲基溴化铵溶液中,在60℃恒温水浴中搅拌5h,老化12h,离心分离,去掉上清液,得到八烷基三甲基溴化铵改性的膨润土固体;将(3-氨基丙基)三乙氧基硅烷、水杨醛和氯化钴按摩尔比1:1:1的量各2mol加入到20mL乙醇中形成溶液,在20℃下反应6h,加入八烷基三甲基溴化铵改性的膨润土固体,搅拌2h、沉淀分离,反应生成的含钴有机配合物在分配作用下,插入膨润土层间,形成含钴有机配合物柱撑膨润土;将含钴配合物柱撑膨润土置于马弗炉中,400℃下焙烧6h,其中的碳氮等元素转化为气体溢出,形成孔道,得到氧化硅柱撑的膨润土基多孔材料负载氧化钴催化剂。
采用U形管(内径4mm)连续流动反应评价装置,称量100mg合成得到的膨润土基多孔材料负载氧化钴催化剂放置管中,调节空气的流速为20mL/min,空气流动带动甲醛气体进入U形管反应器中,每小时流过每升催化剂的气体体积(即空速)为6000h-1。在30℃条件下,该催化剂降解浓度为150ppm的甲醛气体,降解率为83%。
实施例3
按照每克膨润土对应0.6mmol八烷基三甲基溴化铵的量,将过30目筛的膨润土加入到质量百分比浓度为1%的八烷基三甲基溴化铵溶液中,在70℃恒温水浴中搅拌6h,老化24h,离心分离,去掉上清液,得到八烷基三甲基溴化铵改性的膨润土固体;将(3-氨基丙基)三乙氧基硅烷、水杨醛和氯化钴按摩尔比1:1:1的量各3mol加入到30mL乙醇中形成溶液,在35℃下反应8h,加入八烷基三甲基溴化铵改性的膨润土固体,搅拌3h、沉淀分离,反应生成的含钴有机配合物在分配作用下,插入膨润土层间,形成含钴有机配合物柱撑膨润土;将含钴配合物柱撑膨润土置于马弗炉中,550℃下焙烧8h,其中的碳氮等元素转化为气体溢出,形成孔道,得到氧化硅柱撑的膨润土基多孔材料负载氧化钴催化剂。
采用U形管(内径4mm)连续流动反应评价装置,称量100mg合成得到的膨润土基多孔材料负载氧化钴催化剂放置管中,调节空气的流速为20mL/min,空气流动带动甲醛气体进入U形管反应器中,每小时流过每升催化剂的气体体积(即空速)为6000h-1。在30℃条件下,该催化剂降解浓度为150ppm的甲醛气体,降解率为88%。
Claims (1)
1.一种膨润土基多孔材料负载氧化钴催化剂的制备方法,其特征是依次包括如下步骤:
1)按照每克膨润土对应0.5~0.8mmol八烷基三甲基溴化铵的量,将过20-50目筛的膨润土加入到质量百分比浓度为0.1%~1%的八烷基三甲基溴化铵溶液中,在60~70℃恒温水浴中搅拌5~6h,老化12~24h,离心分离,去掉上清液,得到八烷基三甲基溴化铵改性的膨润土固体;
2)将(3-氨基丙基)三乙氧基硅烷、水杨醛和氯化钴按摩尔比1:1:1的量各2~4mol加入到20~40mL乙醇中形成溶液,在20~35℃下反应6~8h,加入八烷基三甲基溴化铵改性的膨润土固体,搅拌2~4h、沉淀分离,反应生成的含钴有机配合物在分配作用下,插入膨润土层间,形成含钴有机配合物柱撑膨润土;
3)含钴有机配合物柱撑膨润土置于马弗炉中,400~550℃下焙烧6~8h,其中的碳氮元素转化为气体溢出,形成孔道,得到氧化硅柱撑的膨润土基多孔材料负载氧化钴催化剂。
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