杂多钨酸盐和杂多钼酸盐金属过渡盐在由甲醇和二氧化碳合成碳酸二甲酯中的反应活性。
Reactivity of heteropolytungstate and heteropolymolybdate metal transition salts in the synthesis of dimethyl carbonate from methanol and CO₂.
作者信息
Aouissi Ahmed, Al-Deyab Salem S, Al-Owais Ahmad, Al-Amro Amro
机构信息
Department of Chemistry, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia.
出版信息
Int J Mol Sci. 2010 Jul 23;11(7):2770-9. doi: 10.3390/ijms11072770.
A series of Keggin-type heteropoly compounds (HPC) having different countercations (Co, Fe) and different addenda atoms (W, Mo) were synthesized and characterized by means of Fourier-Transform Infrared Spectrometer (FT-IR) and X-ray powder diffraction (XRD). The catalytic properties of the prepared catalysts for the dimethyl carbonate (DMC) synthesis from CO(2) and CH(3)OH were investigated. The experimental results showed that the catalytic activity is significantly influenced by the type of the countercation and addenda atoms transition metal. Among the catalysts examined, Co(1.5)PW(12)O(40) is the most active for the DMC synthesis, owing to the synergetic effect between Co and W. Investigating the effect of the support showed that the least acidic one (Al(2)O(3)) enhanced the conversion but decreased the DMC selectivity in favor of that of methyl formate (MF), while that of dimethoxy methane remained stable.
合成了一系列具有不同抗衡阳离子（Co、Fe）和不同附加原子（W、Mo）的Keggin型杂多化合物（HPC），并通过傅里叶变换红外光谱仪（FT-IR）和X射线粉末衍射（XRD）对其进行了表征。研究了所制备催化剂用于由CO₂和CH₃OH合成碳酸二甲酯（DMC）的催化性能。实验结果表明，催化活性受抗衡阳离子类型和附加原子过渡金属的显著影响。在所考察的催化剂中，Co(1.5)PW(12)O(40)对DMC合成最具活性，这归因于Co和W之间的协同效应。对载体效应的研究表明，酸性最弱的载体（Al₂O₃）提高了转化率，但降低了DMC的选择性，有利于甲酸甲酯（MF）的选择性，而二甲氧基甲烷的选择性保持稳定。
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