以苯甲醛为原料,在催化剂作用下与乙醛通过羟醛缩合反应生成肉桂醛,探讨了催化剂催化反应的工艺条件,并采用了GC-MS、IR和1H NMR等手段对产物进行表征。实验结果表明:在使用Na2CO3/γ-Al2O3作为催化剂,11.60 g 40%乙醛,n(苯甲醛)∶n(乙...以苯甲醛为原料,在催化剂作用下与乙醛通过羟醛缩合反应生成肉桂醛,探讨了催化剂催化反应的工艺条件,并采用了GC-MS、IR和1H NMR等手段对产物进行表征。实验结果表明:在使用Na2CO3/γ-Al2O3作为催化剂,11.60 g 40%乙醛,n(苯甲醛)∶n(乙醛)为1.3∶1,反应温度30℃、反应时间1 h、催化剂用量1 g,肉桂醛得率可达40.9%。展开更多
Abstract： In order to improve the reactivity of Na2CO3/Al2O3 sorbent with CO2, a new sorbent showing high reactivity was developed by doping Na2CO3/Al2O3 with TiO2 using impregnation. Fourteen multi-cycle carbonation...Abstract： In order to improve the reactivity of Na2CO3/Al2O3 sorbent with CO2, a new sorbent showing high reactivity was developed by doping Na2CO3/Al2O3 with TiO2 using impregnation. Fourteen multi-cycle carbonation/regeneration tests of the sorbent were carried out in a fluidized-bed reactor and the sorbent was characterized by X-ray diffraction and nitrogen adsorption. It is confirmed that TiO2 shows a positive effect on the adsorption process of Na2CO3 and the reaction rate is observed to increase significantly, especially in the first 10 min. Moreover, TiO2 is stable within the temperature range of the process and no other Ti-compounds are detected. The carbonation products are NaHCO3 and Na5H3 （CO3 ）4. The surface area and the pore volume of the sorbent keep stable after 14 cycles. The Fourier transform infrared spectroscopy and the X-ray photoelectron spectroscopy are used to analyze the effect mechanism of TiO2 on CO2 adsorption process of Na2CO3/Al2O3.展开更多
基金The National Natural Science Foundation of China(No.51476030)the Specialized Research Fund for the Doctoral Program of Higher Education(No.20130092110006)
文摘Abstract： In order to improve the reactivity of Na2CO3/Al2O3 sorbent with CO2, a new sorbent showing high reactivity was developed by doping Na2CO3/Al2O3 with TiO2 using impregnation. Fourteen multi-cycle carbonation/regeneration tests of the sorbent were carried out in a fluidized-bed reactor and the sorbent was characterized by X-ray diffraction and nitrogen adsorption. It is confirmed that TiO2 shows a positive effect on the adsorption process of Na2CO3 and the reaction rate is observed to increase significantly, especially in the first 10 min. Moreover, TiO2 is stable within the temperature range of the process and no other Ti-compounds are detected. The carbonation products are NaHCO3 and Na5H3 （CO3 ）4. The surface area and the pore volume of the sorbent keep stable after 14 cycles. The Fourier transform infrared spectroscopy and the X-ray photoelectron spectroscopy are used to analyze the effect mechanism of TiO2 on CO2 adsorption process of Na2CO3/Al2O3.
