Lee Joongwon, Hong Ung Gi, Hwang Sunhwan, Youn Min Hye, Song In Kyu
J Nanosci Nanotechnol. 2014 Nov;14(11):8817-22. doi: 10.1166/jnn.2014.9944.
ZSM5 catalysts (PAM(X)-ZSM5) with micropores and mesopores were prepared using polyacrylamide (PAM) as a soft template at different PAM content (X = 0, 0.12, 0.25, 0.53, 0.64, and 0.78 wt%), and they were applied to the production of light olefins (ethylene and propylene) through catalytic cracking of C5 raffinate. The effect of PAM content of PAM(X)-ZSM5 catalysts on the physicochemical properties and catalytic activities was investigated. N2 adsorption-desorption isotherms of PAM(X)-ZSM5 catalysts exhibited a broad hysteresis loop at high relative pressure, indicating the existence of mesopores in the catalysts. It was found that the catalytic performance of PAM(X)-ZSM5 catalysts was closely related to the mesoporosity of the catalysts. Conversion of C5 raffinate and yield for light olefins showed volcano-shaped trends with respect to mesopore/micropore volume ratio of the catalysts. Thus, an optimal PAM content was required to achieve maximum production of light olefins through catalytic cracking of C5 raffinate over microporous and mesoporous PAM(X)-ZSM5 catalysts.
以聚丙烯酰胺（PAM）为软模板，在不同PAM含量（X = 0、0.12、0.25、0.53、0.64和0.78 wt%）下制备了具有微孔和介孔的ZSM5催化剂（PAM(X)-ZSM5），并将其应用于通过C5抽余液的催化裂化生产轻质烯烃（乙烯和丙烯）。研究了PAM(X)-ZSM5催化剂中PAM含量对其物理化学性质和催化活性的影响。PAM(X)-ZSM5催化剂的N2吸附-脱附等温线在高相对压力下呈现出较宽的滞后环，表明催化剂中存在介孔。研究发现，PAM(X)-ZSM5催化剂的催化性能与催化剂的介孔率密切相关。C5抽余液的转化率和轻质烯烃的产率随催化剂的介孔/微孔体积比呈火山形趋势。因此，需要一个最佳的PAM含量，以通过微孔和介孔PAM(X)-ZSM5催化剂上C5抽余液的催化裂化实现轻质烯烃的最大产量。
