Synthesis of ZSM‐5 by hydrothermal method with pre‐mixing in a stirred‐tank reactor

作者：Bao‐Chang Sun, Yingying Kang, Qin Shi, Moses Arowo, Yong Luo, Guang‐Wen Chu, Hai‐Kui Zou · 发表于：The Canadian Journal of Chemical Engineering · 年份：2019 · DOI：10.1002/cjce.23593 · 被引用次数：13 · 研究领域：Zeolite Catalysis and Synthesis、Catalytic Processes in Materials Science、Mesoporous Materials and Catalysis

This work proposed a synthesis route of ZSM‐5 via the hydrothermal method with premixing in a stirred tank reactor (STR). Effects of various operating conditions, including pre‐mixing time, molar ratio of SiO 2 /Al 2 O 3 , TPAOH (organic template agents) concentration, NaCl (alkali metal cations) concentration, crystallization temperature, and crystallization reaction time, on the average particle size (PS) and particle size distribution (PSD) were investigated. It was found that the pre‐mixing time in the STR significantly affect the formation of proto‐nuclei in premixing process and crystal growth in hydrothermal reaction process, and consequently influence the PS and PSD of the prepared ZSM‐5. ZSM‐5 with good thermal stability, a PS of 380 nm, PSD of 0.17–0.9 µm, pore diameter of 2.31 nm, pore volume of 0.19 cm 3 · g −1 and specific surface area of 337.25 m 2 · g −1 were obtained under the optimal conditions of a crystallization reaction time of 24 h, a crystallization temperature of 130 °C, a molar ratio of SiO 2 /Al 2 O 3 of 200, a TPAOH concentration of 3.5 mol · L −1 , NaCl concentration of 0.3 mol · L −1 , and a pre‐mixing time of 5 h. This work indicated that the operating conditions including premixing time have a significant effect on its PS and PSD.