关于精对苯二甲酸(PTA)生产用钯碳催化剂的制备研究

本文主要对精对苯二甲酸(PTA)生产用钯碳催化剂的制备与再生进行了分析。首先对新鲜催化剂制备与催化剂活性评价进行了分析,接着对制备过程对催化剂活性的影响进行了分析,主要是吸附周期及还原过程的影响,最后对钯催化剂寿命延长及再生进行了研究,钯碳催化剂寿命延长失活与钯碳催化剂再生能够再生失活钯碳催化剂。     

Selectivity adsorption of thiophene alkylated derivatives over modified Cu＋-13X zeolite

Solid adsorbents Cu+-13X and Cu+-13X loaded with La element were prepared by ion-exchange method. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the structure of the prepared zeolite. Adsorption of thiophene with different groups over the two adsorbents was investigated by static adsorption equilibrium and kinetic test. Static equilibrium data were correlated based on the Langmuir model and the modified Langmuir model. Kinetic data were fitted very well by Crank diffusion model. The results revealed that the adsorption capacity of single component over the Cu+-13X loaded with La element increased about 10% as compared to the non-doped Cu+-13X. Fitting results of ηi and De illustrated that loading of the La element into zeolite could change the interaction force between binary components. The kinetic test showed that the competitive adsorption became moderate, and thus resulted in the improvement of the total desulfurization capacity.