有机阴离子柱撑水滑石催化酯交换合成碳酸二苯酯

 A series of organic anion-pillared hydrotalcites were synthesized by the ion exchange method and characterized by X-ray diffraction and Fourier transform infrared spectroscopy. The hydrotalcite precursor and pillared hydrotalcites with different anions was tested as catalysts in transesterification of dimethyl carbonate (DMC) with phenol. The results show that the catalytic selectivity of this transesterification reaction over these organic anion-pillared hydrotalcites is significantly improved. The catalytic selectivities of C4H4O4-, C6H8O4-, C10H16O4-, 1,4-C8H4O4-, and C7H5O2-pillared hydrotalcites for transesterified products (diphenyl carbonate and methyl phenyl carbonate) are all greater than 90%, at least 10% higher than that of the hydrotalcite precursor. Under the conditions of n(phenol)/n(DMC)=4, catalyst amount=1.5%, and t=10 h, the C6H8O4-pillared hydrotalcite presents the best catalytic performance, and the DMC conversion and the selectivity for transesterified products reach 43.8% and 93.2%, respectively.

Synthesis of Diphenyl Carbonate through Transesterification Catalyzed by Organic Anion-Pillared Hydrotalcites

A series of organic anion-pillared hydrotalcites were synthesized by the ion exchange method and characterized by X-ray diffraction and Fourier transform infrared spectroscopy.The hydrotalcite precursor and pillared hydrotalcites with different anions was tested as catalysts in transesterification of dimethyl carbonate(DMC) with phenol.The results show that the catalytic selectivity of this transesterification reaction over these organic anion-pillared hydrotalcites is significantly improved.The catalytic selectivities of C_4H_4O_4-,C_6H_8O_4-,C_(10)H_(16)O_4-,(1,4-)C_8H_4O_4-,and C_7H_5O_2-pillared hydrotalcites for transesterified products(diphenyl carbonate and methyl phenyl carbonate) are all greater than 90%,at least 10% higher than that of the hydrotalcite precursor.Under the conditions of(n(phenol))/(n(DMC))=4,catalyst amount=1.5%,and t=10 h,the C_6H_8O_4-pillared hydrotalcite presents the best catalytic performance,and the DMC conversion and the selectivity for transesterified products reach 43.8% and 93.2%,respectively.