Organosilane Surfactant-Directed Synthesis of Hierarchical ZSM-5 Zeolites with Improved Catalytic Performance in Methanol-to-Propylene Reaction

Abstract

The hierarchical ZSM-5 zeolites with interconnected meso-/microporosity have been successfully synthesized by using the commercial organosilane surfactant TPOAC as the mesopore structure-directing agent, and the influence of the TPOAC/SiO 2 ratio in the initial synthesis gel on the crystallinity, hierarchical structure, and acidity of the obtained hierarchical ZSM-5 zeolites were systematically investigated through a combination of XRD, FTIR, SEM, TEM, N 2 adsorption, TGA, ICP, and NH 3 -TPD techniques. The catalytic performance was evaluated by the methanol-to-propylene (MTP) reaction, and the obtained results indicated that the hierarchical ZSM-5 catalysts directed by TPOAC exhibited significant enhancement in the catalytic performance reflected at activity, lifetime, product yield, P/E ratio, and coke toleration by virtue of their superior meso-/micropore interconnectivity and appropriately weakened acidity, comparing with the commercial bulky ZSM-5 and the conventional sole micropore ZSM-5.

Enhancing arsenic removal from acidic wastewater using zeolite‐supported sulfide nanoscale zero‐valent iron: the role of sulfur and copper

“…The band at 550 cm −1 appeared due to the symmetric stretching vibration of the five-membered rings of T O T in the MFI framework, which is in agreement with the results of XRD. 45 The bands at 1090 and 1230 cm −1 were assigned to the symmetric and asymmetric stretching vibration of the tetrahedral structure in ZSM-5 zeolite, respectively. 45 The peak around 1651 cm −1 was assigned to the surface-absorbed water.…”

“…45 The bands at 1090 and 1230 cm −1 were assigned to the symmetric and asymmetric stretching vibration of the tetrahedral structure in ZSM-5 zeolite, respectively. 45 The peak around 1651 cm −1 was assigned to the surface-absorbed water. 52 Additionally, two bands at 454 cm −1 and 794 cm −1 were ascribed to the typical Fe S bond and the OH vibration of FeOOH, respectively.…”

Facile Synthesis of Proton‐Type ZSM‐5 by Using Quasi‐Solid‐Phase (QSP) Method

“…They have been widely applied in the fields of petroleum and fine chemical preparation . Proton‐type ZSM‐5 (HZSM‐5), either as a solid acid catalyst or a support, has been used widely in shape‐selective catalysis …”

Synthesis of mesoporous ZSM-5 zeolite encapsulated in an ultrathin protective shell of silicalite-1 for MTH conversion

“…Mesoporous ZSM-5 zeolite with hierarchical pore structure provides a shorter diffusion path, thus enhancing the accessibility to the active sites and improving the resistance to deactivation by coke formation [19][20][21][22]. The mesoporous system can be created in the zeolite either by post-synthetic treatment such as alkali treatment and steaming [23][24][25] or by direct synthesis using hard/soft templates [26][27][28][29][30].…”