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| 1 | Adsorption Thermodynamics and Diffusion Kinetics of PX over Na Y Zeolite Synthesized by In-Situ Crystallization from Kaolin Microsphere显示文摘Para-xylene was chosen as the probe molecule to study adsorption thermodynamics and diffusion kinetics on NaY zeolite and composite structured NaY zeolite synthesized by in-situ crystallization from kaolin microsphere(designated as Na Y/kaolin composites) separately, using a high precision intelligent gravimetric analyzer(IGA). The adsorption isotherms showed normal Langmuir type-Ⅰ behaviors. The increased adsorption heat with an increasing p-xylene coverage supported a mechanism of phase transition, diffusion and re-arrangement of p-xylene molecules during the adsorption process. The rearrangement seemed to be most pronounced at an adsorption loading of 2.13 and 2.29 mmol/g for Na Y zeolite and Na Y/kaolin composites respectively. Compared with Na Y zeolite, a 2—3 times higher in the diffusion coefficient of p-xylene was observed on Na Y/kaolin composites when the pressure was more than 50 Pa. Temperature-programmed desorption(TPD) of p-xylene on two samples from room temperature to 450 ℃ at a special loading has also been investigated by IGA. Results showed only single desorption peak appeared for Na Y zeolite, indicating that adsorption can only occur in the super-cage structure. Comparably, there were two different peaks for in-situ synthesized Na Y zeolite, corresponding to the two thermo desorption processes in both super-cage structure and the channels provided by kaolin, respectively.Key words: | Zhao Hua Song Lijuan Qin Yucai Duan Linhai Sun Zhaolin | 2014 | China Petroleum Processing & Petrochemical Technology2014，16，4： | 5 |
| 2 | 催化裂化催化剂LZR-20的柠檬酸改性研究显示文摘对高温焙烧后的LZR-20催化剂进行了柠檬酸改性,采用X射线衍射仪、X射线荧光光谱仪、N2吸附、磨损指数仪对改性后的催化剂进行了表征。结果表明:柠檬酸改性前后,催化剂的结晶度和稀土含量变化较小,磨损指数虽有所升高,但随着柠檬酸处理前催化剂焙烧温度的升高,磨损指数逐渐下降;改性后催化剂的介孔孔体积和比表面积明显增加,且介孔孔体积随改性前催化剂焙烧温度的升高而增大;经800℃焙烧后再经柠檬酸处理的催化剂,与改性前相比,重油产率下降0.99%,总液收增加0.90%。 | 熊晓云 张敦荣 杜学敏 胡清勋 | 2021 | 精细石油化工2021，38，4： | 0 |
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