CN116571279A - 多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用 - Google Patents
多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用 Download PDFInfo
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Abstract
本发明属于催化剂技术领域,涉及一种多酸‑间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,将多酸‑间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物和底物CEES加入到甲醇中,再加入过氧化氢水溶液,在水浴条件下进行反应,对反应后的体系进行反应转化率和选择性计算。本发明的多酸‑间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物用于氧化降解CEES时,在低温常压条件下,催化反应的时间更短,CEES的转化率以及产物CEESO的选择性更高,CEES反应转化率可达到96‑97%,CEESO选择性高达99%,实现了高效催化氧化降解,同时催化剂在反应后仍保持了结构的完整性,是一类非均相催化剂。
Description
技术领域
本发明属于催化剂技术领域,具体涉及一种多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用。
背景技术
2-氯乙基乙基硫醚(CEES)是一种芥子气模拟物,属于糜烂性毒剂,会导致皮肤和组织细胞发生极其严重的起泡。因此,开发安全有效的方法来对其进行处理是一个亟待解决的全球性问题。其中,催化氧化是一种极具潜力的降解途径,主要是在催化剂的作用下,利用氧化剂将CEES氧化成亚砜类产物CEESO和砜类产物CEESO2,而过度氧化得到的砜类产物CEESO2与CEES毒性相当。因此,选择性是CEES氧化反应中需要考虑的关键问题。
合适的催化剂对反应选择性的高低有着重要的作用。多金属氧酸盐(POMs)是一类独特的金属氧化物纳米团簇,具有优异的酸性和氧化还原性能,被广泛应用于催化领域。尤其是含钼或钨原子的POMs,是一类最常用的氧化反应催化剂,而POMs在溶剂体系中极易溶解,使其无法作为非均相催化剂应用于催化反应。
发明内容
本发明的目的在于提供一种结构稳定,选择性高,不产生有害副产物的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,以解决上述背景技术中提出的问题。
为达到上述技术目的,本发明的技术方案:
多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,将多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物和底物CEES加入到甲醇中,再加入3%wt过氧化氢水溶液,在水浴30-40℃条件下,反应10-50min,对反应后的体系进行反应转化率和选择性计算。
作为一种改进,底物CEES、多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物和过氧化氢的摩尔比为1:0.005:4。
作为一种改进,所述甲醇的加入量为4ml。
作为一种改进,所述多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物通过以下方法制得:
(1)将2,6-二羟基甲苯与三聚乙醛进行缩合反应,得中间产物A;
(2)将所述中间产物A和CH2ClBr反应,得中间产物B;
(3)将所述中间产物B与N-溴代丁二酰亚胺进行溴代反应,得中间产物C;
(4)通过2-巯基-4-(2′-吡啶基)嘧啶对所述中间产物C的上缘进行修饰,得间苯二酚杯[4]芳烃衍生物配体D;
间苯二酚杯[4]芳烃衍生物配体D的合成路线如下:
(5)将所述间苯二酚杯[4]芳烃衍生物配体D与多酸、氯化铜加入溶剂中,加氢氧化钠溶液调节pH,于140℃下反应,反应结束后进行离心、过滤、洗涤,于70-100℃下干燥,得多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物。
作为一种改进,所述多酸为Keggin型多酸,所述多酸为磷钼酸或磷钨酸。
作为一种改进,所述中间产物C与所述2-巯基-4-(2′-吡啶基)嘧啶的摩尔比为1:4。
作为一种改进,所述溶剂为N,N′-二甲基乙酰胺和乙醇的混合溶剂,所述混合溶剂中N,N′-二甲基乙酰胺和乙醇的体积比为1:3。
作为一种改进,所述间苯二酚杯[4]芳烃衍生物配体与多酸、氯化铜的摩尔比为1:1:4。
作为一种改进,所述氢氧化钠的浓度为0.2mol/L。
由于采用上述技术方案,本发明的有益效果:
本发明采用多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物作为催化剂,其具有一维超分子链结构,该一维超分子链结构是由氢键连接而成,该催化剂既能克服多酸本身溶解度高的缺点,且保留了多酸独特的化学性质,在催化氧化CEES反应中提供了催化活性位点,有利于提高催化剂的催化效果,同时生成产物CEESO的选择性也大大提高;所用的催化剂用于氧化降解CEES时,在低温常压条件下,催化反应的时间更短,CEES的转化率以及产物CEESO的选择性更高,CEES反应转化率可达到96-97%,CEESO选择性高达99%,实现了高效催化氧化降解,同时催化剂在反应后仍保持了结构的完整性,是一类非均相催化剂。
附图说明
图1是本发明制得的催化剂1的PXRD图;
图2是本发明制得的催化剂2的PXRD图;
图3是本发明制得的催化剂1浸泡过不同溶剂的PXRD图;
图4是本发明制得的催化剂2浸泡过不同溶剂的PXRD图;
图5是本发明制得的催化剂1浸泡过不同pH水溶液的PXRD图;
图6是本发明制得的催化剂2浸泡过不同pH水溶液的PXRD图;
图7是本发明制得的催化剂1在催化氧化CEES反应后的PXRD图;
图8是本发明制得的催化剂2在催化氧化CEES反应后的PXRD图。
具体实施方式
下面结合具体实施方式及附图对本发明作进一步地说明。
实施例1
首先,将三聚乙醛置于恒压滴液漏斗中,将2,6-二羟基甲苯加入到37%浓盐酸与乙醇的混合溶剂中,其中三聚乙醛与2,6-二羟基甲苯的摩尔比为1:1。混合后开始滴加三聚乙醛,滴加完毕开始加热搅拌,在70℃下反应16h,反应后得到的混合物经过滤、洗涤、干燥处理得到中间产物A,产率为85-90%。
然后,将中间产物A、CH2ClBr及无水碳酸钾以摩尔比1:17:21的比例加入到N,N′-二甲基甲酰胺中,在氮气氛围下加热到70-80℃,回流搅拌12-14h,反应后的混合物经过滤得到滤液,随后进行旋蒸处理,旋蒸后加入二氯甲醇及适量蒸馏水,溶液分层后进行萃取,收集有机相后经色谱柱进行纯化分离,纯化后的有机相加入少量乙腈,再次旋蒸,最后经过滤、洗涤、干燥处理得到,中间产物B,产率为60-70%。
将中间产物B、N-溴代丁二酰亚胺(NBS)及偶氮二异丁腈(AIBN)加入到四氯化碳中,其中,中间产物B和N-溴代丁二酰亚胺(NBS)的摩尔比为1:4。反应体系加热到70-80℃,回流搅拌5-8h,反应后的混合物进行旋蒸处理,然后加适量乙醇,经过滤、洗涤、干燥,得到中间产物C,产率为90-96%。
最后,将中间产物C与2-巯基-4-(2′-吡啶基)嘧啶、无水碳酸钾以1:5:5的摩尔比加入到N,N′-二甲基甲酰胺中,在氮气保护下加热到85-90℃,回流搅拌10-12h,反应后的混合物过滤除去碳酸钾,所得滤液进行旋蒸处理,旋蒸后加入适量蒸馏水,经过滤、洗涤、干燥处理,可得间苯二酚杯[4]芳烃衍生物配体D,产量为80-90%。
将上述间苯二酚杯[4]芳烃配体D与磷钼酸、氯化铜以摩尔比1:1:4的比例加入到N,N′-二甲基乙酰胺/乙醇(两者体积比1:3)的混合溶液中,滴加6滴0.2mol/L的NaOH溶液调节pH值,整个溶液体系在140℃下维持3天,获得磷钼酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物,记为催化剂1。
将上述间苯二酚杯[4]芳烃配体D与磷钨酸、氯化铜以摩尔比1:1:4的比例加入到N,N′-二甲基乙酰胺/乙醇(两者体积比1:3)的混合溶液中,滴加2滴0.2mol/L的NaOH溶液调节pH值,整个溶液体系在140℃下维持3天,获得磷钨酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物,记为催化剂2。
从图1和图2中两种催化剂的PXRD谱图可以看出:实验合成的催化剂1和催化剂2的PXRD曲线与模拟曲线相吻合,证明所制备的催化剂是纯相的。
将催化剂1和催化剂2分别在乙醇、甲醇、水、二氯、乙腈、丙酮等溶剂中浸泡12h,随后将两种催化剂进行过滤、洗涤及干燥处理,并分别测得相应的PXRD曲线。从图3和图4中可以看出,所测得的PXRD曲线仍与模拟曲线相吻合。
将催化剂1和催化剂2分别在pH为0、2、4、6、8、10、12的水溶液中浸泡12h,随后将两种催化剂进行过滤、洗涤及干燥处理,并分别测得相应的PXRD曲线。从图5和图6中可以看出,所测得的PXRD曲线仍与模拟曲线相吻合。
上述实验表明,两种催化剂具有极其优异的化学稳定性。
实施例2
将实施例1制备的两种催化剂用于催化氧化CEES反应。基本反应体系为:底物CEES为0.25mmol,催化剂为1.25μmol,3%wt H2O2为1mmol,甲醇为4ml。首先,以催化剂1为例,探究CEES氧化反应的最佳反应条件。在不加任何催化剂的条件下,在温度为40℃,反应时间为50min时,CEES的转化率只有21%,CEESO的选择性为53%。当加入催化剂1时,在反应温度为40℃,反应时间为10min时,CEES的转化率只有20%,CEESO的选择性为55%;相同温度下,分别将时间延长至20、30、40、50min时,CEES的转化率分别为44%、73%、91%、96%,CEESO的选择性分别为62%、93%、97%、99%。可见,在温度为40℃,反应时间为50min时,催化剂1的催化效果最好。而当降低温度至30℃,反应时间为50min时,CEES的转化率降至56%,CEESO的选择性降至76%。结果表明,本发明中CEES氧化反应的最佳反应条件为:反应温度40℃,反应时间50min。
在上述最佳反应条件(反应温度40℃,反应时间50min)下,以催化剂2代替催化剂1时,CEES的转化率为97%,CEESO的选择性为99%。这说明两种催化剂的催化效果类似。
实施例3
在实施例2所述的基本反应体系基础上,我们同样探究了在温度为40℃,50min内催化剂2催化氧化CEES反应的动力学行为。结合实施例1中所得催化剂1催化氧化CEES反应的动力学可知,催化剂2所得到的反应半衰期比催化剂1缩短了将近3倍,可见,催化剂2的催化性能更为优异。
实施例4
为了进一步确定催化活性位点,阐明催化反应机理,我们以单独的磷钼酸物质作为催化剂,在实施例2所述的最佳反应条件(反应温度40℃,反应时间50min)下,CEES的转化率和CEESO的选择性均高达99%。结果表明,磷钼酸组分是催化氧化CEES的主要的活性物质。同样地,磷钨酸组分也是催化氧化CEES的主要活性物种。反应机理如下:催化剂中的[PMo12O40]3-或[PW12O40]3-阴离子与H2O2反应生成活性含钼过氧物种或含钨过氧物种,随后活性物种氧化CEES生成相应的产物CEESO和CEESO2。最后,活性过氧物种被还原为[PMo12O40]3-或[PW12O40]3-阴离子。
实施例5
为了进一步证明催化剂的非均相性,以催化剂1为例,在催化氧化CEES反应结束后,将催化剂1滤除,并对滤液进行电感耦合等离子体(ICP)测试,并发现溶液中并无金属离子的泄漏。同时,将催化剂1过滤、洗涤并干燥,随后对其进行了PXRD测试。结果表明,反应后催化剂1依然保留了结构的完整性。综上所述,如图7所示,本发明所提供的催化剂是一类非均相催化剂。
以上所述本发明的具体实施方式,并不构成对本发明保护范围的限定。任何根据本发明的技术构思所做出的各种其他相应的改变与变形,均应包含在本发明权利要求的保护范围内。
Claims (9)
1.多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,将多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物和底物CEES加入到甲醇中,再加入3%wt过氧化氢水溶液,在水浴30-40℃条件下,反应10-50min,对反应后的体系进行反应转化率和选择性计算。
2.根据权利要求1所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,底物CEES、多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物和过氧化氢的摩尔比为1:0.005:4。
3.根据权利要求1所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述甲醇的加入量为4ml。
4.根据权利要求1所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物通过以下方法制得:
(1)将2,6-二羟基甲苯与三聚乙醛进行缩合反应,得中间产物A;
(2)将所述中间产物A和CH2ClBr反应,得中间产物B;
(3)将所述中间产物B与N-溴代丁二酰亚胺进行溴代反应,得中间产物C;
(4)通过2-巯基-4-(2′-吡啶基)嘧啶对所述中间产物C的上缘进行修饰,得间苯二酚杯[4]芳烃衍生物配体D;
(5)将所述间苯二酚杯[4]芳烃衍生物配体D与多酸、氯化铜加入溶剂中,加氢氧化钠溶液调节pH,于140℃下反应,反应结束后进行离心、过滤、洗涤,于70-100℃下干燥,得多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物。
5.根据权利要求4所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述多酸为Keggin型多酸,所述多酸为磷钼酸或磷钨酸。
6.根据权利要求4所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述中间产物C与所述2-巯基-4-(2′-吡啶基)嘧啶的摩尔比为1:4。
7.根据权利要求4所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述溶剂为N,N′-二甲基乙酰胺和乙醇的混合溶剂,所述混合溶剂中N,N′-二甲基乙酰胺和乙醇的体积比为1:3。
8.根据权利要求4所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述间苯二酚杯[4]芳烃衍生物配体与多酸、氯化铜的摩尔比为1:1:4。
9.根据权利要求4所述的多酸-间苯二酚杯[4]芳烃Cu(Ⅰ)基配合物在催化氧化CEES反应中的应用,其特征在于,所述氢氧化钠溶液的浓度为0.2mol/L。
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