CN106362796A - Ta/W混配型杂多酸,制备方法及其在酸催化和质子导电中的应用 - Google Patents
Ta/W混配型杂多酸,制备方法及其在酸催化和质子导电中的应用 Download PDFInfo
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Abstract
本发明公开了一种Ta/W混配型杂多酸,制备方法及其在酸催化和质子导电中的应用,属于无机合成及酸催化技术领域。本发明的技术方案要点为:Ta/W混配型杂多酸的分子式为H20[P8W60Ta12(H2O)4(OH)8O236]·125H2O,由1个四聚的Ta/W混配型杂多阴离子、20个质子和125个结晶水分子组成,乙腈中以二苯基壬四烯铜为指示剂测得该Ta/W混配型杂多酸的Hammett酸强度为‑2.91。本发明还公开了该Ta/W混配型杂多酸的制备方法及其在酸催化和质子导电中的应用。本发明制得的Ta/W混配型杂多酸是目前已知的杂多酸中酸性最强的,这种强酸性能使得Ta/W混配型杂多酸具有较高的酸催化活性;制得的Ta/W混配型杂多酸的固态结构中存在大量的氢键,并进一步形成氢键网络,因此该混配型杂多酸具有较强的质子导电能力。
Description
技术领域
本发明属于无机合成及酸催化技术领域,具体涉及一种Ta/W混配型杂多酸,制备方法及其在酸催化和质子导电中的应用。
背景技术
杂多酸(HPAs)是多酸化学中一类重要的化合物,通常是由典型结构的多阴离子和质子组成。这些多阴离子具有低的碱性,所以这些杂多酸一般都是很强的Brønsted酸。杂多酸具有高效的酸催化活性,尤其是在有机溶剂中,其摩尔催化活性通常是硫酸等矿物酸的100-1000倍。而且与矿物酸相比,杂多酸催化的反应很少有副反应发生。因此,杂多酸非常适合催化有机溶剂中的很多种均相反应。自上世纪70年代杂多酸催化丙烯水合制备异丙醇的项目实现工业化以来,全世界已有多个杂多酸催化的项目实现了工业化。
然而,目前结构明确的杂多酸并不多,包括Keggin 型 H3[PW12O40]·nH2O和H3[PMo12O40]·nH2O,Dawson型H7[In(H2O)P2W17O61]·23H2O和夹心型 H8[Ti2{P2W15O54(OH2)2}2]·31H2O。结构明确的杂多酸并不多的原因在于:(1)大多数的多酸化合物,尤其是复杂的多酸化合物,只在较窄的pH范围内稳定存在,在强酸条件下会转化为经典的Keggin或Dawson结构的化合物;(2)很难得到这类化合物的单晶结构。
另一方面,尽管基于VV、MoVI、WVI甚至NbV的多酸取得了巨大的进步,但人们对关于TaV的多酸知之甚少。在发现K8[Ta6O19]六十多年后,人们在合成含钽多酸方面仍面临巨大的挑战,主要是由于在合成过程中可溶的含钽前躯体(如:[Ta6O19]8–或TaCl5)在水溶液中会很容易地转化成凝胶状或沉淀状的Ta2O5。
最近,我们课题组和Nyman课题组的研究结果表明,在酸性溶液中可以合成Ta/W混配型质子多酸,这种Ta/W混配型杂多酸在电子、电化学性能、溶解度、稳定性、反应性和光催化性能方面,不同于单纯的多钽酸盐和多钨酸盐,将为含Ta多酸的发展提供很好的机会。然而,这些Ta/W混配型杂多酸的研究仍停留在早期阶段,到目前为止,人们发现的Ta/W混配型杂多酸屈指可数。因此,探索和发展Keggin或Dawson结构以外的新型Ta/W混配型杂多酸,研究其化学反应活性并开发其在酸催化领域的应用具有重大意义。
发明内容
本发明解决的技术问题是提供了一种Ta/W混配型杂多酸及其制备方法,该Ta/W混配型杂多酸具有很好的酸催活性及质子导电能力。
本发明为解决上述技术问题采用如下技术方案,Ta/W混配型杂多酸,其特征在于:该Ta/W混配型杂多酸的分子式为H20[P8W60Ta12(H2O)4(OH)8O236]·125H2O,由1个四聚的Ta/W混配型杂多阴离子、20个质子和125个结晶水分子组成,乙腈中以二苯基壬四烯铜为指示剂测得该Ta/W混配型杂多酸的Hammett酸强度为-2.91。
本发明所述的Ta/W混配型杂多酸的制备方法,其特征在于采用离子交换法合成,具体步骤为:
步骤(1),将0.2g K5Na4[P2W15O59(TaO2)3]·17H2O溶于25mL去离子水中,再向溶液中加入0.04g NaHSO3,待溶液还原至无色后用摩尔浓度为1mol/L的盐酸溶液调节反应体系的pH值为2,并保持20min,待溶液冷却至室温后放置冰箱过夜得到前驱体针状晶体K8Na8H4[P8W60Ta12(H2O)4(OH)8O236]·42H2O;
步骤(2),将100g活化后的阳离子交换树脂装入内径为15mm的层析柱内,再向层析柱内倒入400mL摩尔浓度为1mol/L的盐酸溶液,控制出液速率为1滴/2s使层析柱呈酸性,然后用去离子水冲洗层析柱至中性;
步骤(3),将3g步骤(1)得到的前驱体溶于5.0mL去离子水中,再将上述溶液倒入步骤(2)处理好的层析柱内,控制出液速率为1滴/2s,然后用去离子水冲洗层析柱至中性,将收集到的溶液于80℃旋转蒸发得到黄色固体Ta/W混配型杂多酸。
本发明所述的Ta/W混配型杂多酸在酸催化领域中的应用。
本发明所述的Ta/W混配型杂多酸在质子导电领域中的应用。
本发明制得的Ta/W混配型杂多酸是目前已知的杂多酸中酸性最强的,这种强酸性能使得Ta/W混配型杂多酸具有较高的酸催化活性;制得的Ta/W混配型杂多酸的固态结构中存在大量的氢键,并进一步形成氢键网络,因此该混配型杂多酸具有较强的质子导电能力。
附图说明
图1是本发明实施例1合成的Ta/W混配型杂多酸的晶体结构图;
图2是本发明实施例1合成的Ta/W混配型杂多酸的31P核磁图谱;
图3是本发明实施例1合成的Ta/W混配型杂多酸的固体漫反射光谱;
图4是本发明实施例1合成的Ta/W混配型杂多酸的粉末XRD图谱;
图5是本发明实施例1合成的Ta/W混配型杂多酸的FTIR图谱;
图6是本发明实施例1合成的Ta/W混配型杂多酸在30%相对湿度条件下在30℃(a)、45℃(b)、60℃(c)、75℃(b)和95℃(e)时的Nyquist曲线及其质子传导的Arrhenius曲线(f)。
具体实施方式
以下通过实施例对本发明的上述内容做进一步详细说明,但不应该将此理解为本发明上述主题的范围仅限于以下的实施例,凡基于本发明上述内容实现的技术均属于本发明的范围。
实施例1
Ta/W混配型杂多酸的制备
1、前驱体混合物H4K8Na8[P8W60Ta12(H2O)4(OH)8O236]·nH2O,标记为1,按授权专利(ZL201210236244.0)和文献报道(J. Am. Chem. Soc., 2012, 134, 19716−19721)所述的方法合成;
2、将100g活化后的阳离子交换树脂(Amberlite IR120B NA)装入内径为15mm的层析柱内,再倒入400mL 摩尔浓度为1mol/L的盐酸溶液,控制出液速率为1滴/2s使层析柱呈酸性,然后用去离子水冲洗层析柱至中性;
3、将3g 步骤1得到的前驱体1溶于5.0mL去离子水中,再将上述溶液倒入步骤2处理好的层析柱内,控制出液速率为1滴/2s,然后用去离子水冲洗层析柱至中性,将收集到的溶液于80℃旋转蒸发得到黄色固体即为H-1(2.66g,基于前躯体1的产率为94.7%)。
H-1的晶体结构如图1所示,其分子式为H20[P8W60Ta12(H2O)4(OH)8O236]·125H2O,由1个四聚的Ta/W混配型杂多阴离子、125个结晶水分子和20个质子组成,在H-1的结构中存在大量的氢键并形成氢键网络,这对质子导电性能是非常有利的。
制得的H-1极易溶于水,易溶于丙酮、乙腈、甲醇和乙醇等有机溶剂,不溶于二氯甲烷和氯仿。如图2所示,H-1在重水中的1P NMR谱图在11.2ppm和14.1ppm处出现了1:1的两个信号;在CD3CN中这两个信号分别出现在13.0ppm和11.6ppm处。乙腈中以二苯基壬四烯铜为指示剂测得H-1的Hammett酸强度为-2.91,是目前已知的杂多酸中酸性最强的。
固态时,H-1为黄色粉末,其固态漫反射光谱如图3所示,表明其能有效吸收可见光。H-1的粉末XRD曲线如图4所示,实验数据与单晶模拟数据很好地吻合,说明粉末样品的纯度。H-1的FTIR光谱如图5所示,与前驱体1的FTIR光谱类似,吸收峰的位置略有移动,可能是H-1中大量质子的存在引起的。
实施例2
酸催化活性测试
为了验证H-1的酸催化活性,本实施例以H-1为催化剂催化苯甲醛与5种醇反应。具体方法如下:取苯甲醛3.3mmol,醇25mmol和H-1 10mg,在反应容器中反应90min,其中反应5、9的反应温度为100℃,反应1、2、3、4、6、7和8的反应温度为回流温度,反应结束后通过GC-MS测得各反应的转化率如表1所示。
表1 苯甲醛与各种醇以H-1为催化剂的反应
醇 | 产物 | 转化率 (%)a | TON | TOF/h-1 | |
1 | 甲醇 | 84 | 4828 | 3218 | |
2 | 乙醇 | 37 | 2126 | 1418 | |
3 | 丙醇 | 77 | 4425 | 2950 | |
4 | 异丙醇 | 59 | 3391 | 2261 | |
5 | 正丁醇 | 81 | 4655 | 3103 | |
6 | 异丁醇 | 75 | 4310 | 2874 | |
7 | 仲丁醇 | 29 | 1667 | 1111 | |
8 | 叔丁醇 | 25 | 1437 | 958 | |
9 | 乙二醇 | 83 | 4770 | 3180 |
以苯甲醛与乙二醇的反应为例,当以不同杂多酸为催化剂时,H-1表现出最高的催化活性,具体方法如下:苯甲醛3.3mmol、乙二醇25mmol和不同的杂多酸0.17mol%,在反应容器中于室温反应3h,反应结束后通过GC-MS测得各反应的转化率如表2所示。
表2 以不同杂多酸为催化剂时苯甲醛与乙二醇的反应
HPAs | 转化率 (%)a | TON | TOF/h-1 |
H-1 | 83.5 | 4810 | 1603 |
前驱体1 | 9.2 | 527 | 176 |
H6[P2W18O62] | 32.9 | 1900 | 633 |
H3[PW12O40] | 26.9 | 1552 | 517 |
由表1和表2可知,制得的H-1具有较好的酸催化活性。
实施例3
质子导电性能测试
取制备的样品H-1若干,用压片机压成厚度为1mm,直径为1cm的薄片,夹入电化学工作站回路,在不同湿度、不同温度下对其导电能力进行测试。
在温度为25℃、相对湿度为30%的条件下测得其电导率为7.2×10-3S·cm-1。随着相对湿度的增大25℃时的电导率逐渐提高,在98%的相对湿度时,其电导率达到5.0×10- 2S·cm-1。如图5所示,在保持相对湿度30%不变的情况下,H-1的电导率在所测试的温度范围内(30℃、45℃、60 ℃、75 ℃和95℃)随温度的升高而提高,在95℃时达到7.2×10-2 S·cm-1。根据Arrhenius曲线计算得到H-1质子导的电活化能为0.358eV,表明Grotthuss机理在导电过程中占主导地位。
以上实施例描述了本发明的基本原理、主要特征及优点,本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明原理的范围下,本发明还会有各种变化和改进,这些变化和改进均落入本发明保护的范围内。
Claims (4)
1.Ta/W混配型杂多酸,其特征在于:该Ta/W混配型杂多酸的分子式为H20[P8W60Ta12(H2O)4(OH)8O236]·125H2O,由1个四聚的Ta/W混配型杂多阴离子、20个质子和125个结晶水分子组成,乙腈中以二苯基壬四烯铜为指示剂测得该Ta/W混配型杂多酸的Hammett酸强度为-2.91。
2.一种权利要求1所述的Ta/W混配型杂多酸的制备方法,其特征在于采用离子交换法合成,具体步骤为:
步骤(1),将0.2g K5Na4[P2W15O59(TaO2)3]·17H2O溶于25mL去离子水中,再向溶液中加入0.04g NaHSO3,待溶液还原至无色后用摩尔浓度为1mol/L的盐酸溶液调节反应体系的pH值为2,并保持20min,待溶液冷却至室温后放置冰箱过夜得到前驱体针状晶体K8Na8H4[P8W60Ta12(H2O)4(OH)8O236]·42H2O;
步骤(2),将100g活化后的阳离子交换树脂装入内径为15mm的层析柱内,再向层析柱内倒入400mL摩尔浓度为1mol/L的盐酸溶液,控制出液速率为1滴/2s使层析柱呈酸性,然后用去离子水冲洗层析柱至中性;
步骤(3),将3g步骤(1)得到的前驱体溶于5.0mL去离子水中,再将上述溶液倒入步骤(2)处理好的层析柱内,控制出液速率为1滴/2s,然后用去离子水冲洗层析柱至中性,将收集到的溶液于80℃旋转蒸发得到黄色固体Ta/W混配型杂多酸。
3.权利要求1所述的Ta/W混配型杂多酸在酸催化领域中的应用。
4.权利要求1所述的Ta/W混配型杂多酸在质子导电领域中的应用。
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