不同聚合物分散剂对Pt/SAPO-11催化剂性能的影响

Influence of various polymer dispersants on the performance of Pt/SAPO-11 catalysts

采用浸渍法制备了经过不同聚合物分散剂处理的Pt/SAPO-11催化剂,并通过X射线衍射(XRD)、透射电子显微镜(TEM)、N2吸附-脱附和NH3程序升温脱附(TPD)等对催化剂的组织结构进行了表征。结果表明,分散剂不会破坏催化剂的结构,反而提高了其孔体积、孔径和比表面积,同时改变了沸石的酸强度和酸量,其中以聚乙烯吡咯烷酮处理的Pt/SAPO-11催化剂孔体积、孔径和酸性分布最佳。在固定床反应器上对不同分散剂处理的Pt/SAPO-11催化剂催化性能进行评价,结果表明聚乙烯吡咯烷酮处理的Pt/SAPO-11催化剂也表现出最佳的催化性能,麻风树油的加氢脱氧率高达99.45%,生物航空煤油组分收率和异构烷烃组分(C_(8)~C_(16))的选择性分别达到了44.67%和56.37%。

Pt/SAPO-11 catalysts were prepared by impregnation using different polymer dispersants,and their structural and acidic properties were analyzed and characterized using techniques such as X-ray diffraction(XRD),transmission electron microscopy(TEM),N2 adsorption-desorption,and NH3 temperature-programmed desorption(TPD).The results showed that the dispersants did not destroy the structure of the catalysts,but instead increased their pore volumes,pore sizes,and specific surface areas,while also changing the acid strengths and acid amounts of the zeolites.Among the dispersants used in our work,polyvinyl pyrrolidone(PVP)treatment resulted in the optimal pore volume,pore size,and acid distribution for the Pt/SAPO-11 catalyst.Evaluation of the catalytic performance of the Pt/SAPO-11 catalysts treated with different dispersants in a fixed-bed reactor showed that the PVP-treated Pt/SAPO-11 catalyst also exhibited the best catalytic performance,with a hydrogenation deoxygenation rate of Jatropha oil up to 99.45%,and bio-aviation kerosene component yield and isoparaffins(C_(8)-C_(16))selectivity reaching 44.67%and 56.37%,respectively.