摘要
采用静态吸附法研究了超声离子交换法制备的CuCeY-U吸附剂对噻吩的吸附性能,与传统离子交换法制备的CuCeY-C吸附剂进行了比较;并研究了CuCeY-U吸附剂对噻吩的吸附动力学和热力学特性。实验结果表明,温度对吸附的影响较小,噻吩在CuCeY-U吸附剂上的吸附符合Langmuir等温吸附方程,吸附过程符合准二级吸附动力学方程;该过程的吸附速率的控制步骤主要为颗粒内扩散,同时还受颗粒外扩散的控制。CuCeY-U吸附剂对噻吩吸附反应的热力学参数ΔG<0,ΔH>0,ΔS>0,表明此吸附过程为熵推动的自发的吸热过程。
CuCeY molecular sieves （CuCeY-U） were prepared through ultrasound-assisted ion exchange method and used in adsorption of thiophene from model gasoline. Adsorption capacity of the CuCeY-U was compared with the CuCeY molecular sieves （CuCeY-C） prepared by conventional ion exchange method. Thermodynamics and kinetics for the adsorption of thiophene on the CuCeY-U were studied through static experiments, and influence of temperature on the adsorption was investigated. The results showed that the influence of temperature on the adsorption was small. The adsorption of thiophene on the CuCeY-U accorded with Langmuir isotherm and was in agreement with pseudo- second-order rate equation. The adsorption rate was controlled not only by intra-particle diffusion but also by extra-particle diffusion. Thermodynamic parameters, namely AG, AH and AS, for the adsorption were calculated and △G 〈 0, △H 〉 0 and △S 〉 0 were obtained, which indicated that the adsorption of thiophene on the CuCeY-U was a spontaneous endothermal process.
出处
《石油化工》
CAS
CSCD
北大核心
2010年第8期896-901,共6页
Petrochemical Technology
基金
国家自然科学基金资助项目(20976082)
南通大学自然科学项目(092009)
关键词
噻吩
分子筛
超声
吸附动力学
热力学
thiophene
molecular sieve
ultrasound
adsorption kinetics
thermodynamics
