Hierarchical Macro-meso-microporous ZSM-5 Zeolite Hollow Fibers With Highly Efficient Catalytic Cracking Capability

Abstract

Zeolite fibers have attracted growing interest for a range of new applications because of their structural particularity while maintaining the intrinsic performances of the building blocks of zeolites. The fabrication of uniform zeolite fibers with tunable hierarchical porosity and further exploration of their catalytic potential are of great importance. Here, we present a versatile and facile method for the fabrication of hierarchical ZSM-5 zeolite fibers with macro-meso-microporosity by coaxial electrospinning. Due to the synergistic integration of the suitable acidity and the hierarchical porosity, high yield of propylene and excellent anti-coking stability were demonstrated on the as-prepared ZSM-5 hollow fibers in the catalytic cracking reaction of iso-butane. This work may also provide good model catalysts with uniform wall thickness and tunable porosity for studying a series of important catalytic reactions.

Synthesis of Zeolite-X Supported on Kapok Fiber for CO₂ Capture Material: Variation of Immersion Time during Fiber Activation

“…Addition of supporting material such as fiber is required to solve this problem. The advantages of fiber as a supporting material includes easily forming and high desorption capacity, up to 92.93% at first cycle [11][12]. Currently, synthetic fibers such as glass, carbon, and aramid are being widely used as supporting materials.…”

The Fabrication of Ga2O3/ZSM-5 Hollow Fibers for Efficient Catalytic Conversion of n-Butane into Light Olefins and Aromatics

“…The electrospinning experimental device and the process of electrospinning are similar to that described in the literature [12] except that the flow rate of the paraffin oil is 0.8 mL¨h´1. The as-prepared fibers are denoted x% Ga 2 O 3 /ZSM-5 hollow fibers.…”

“…The unique hierarchical macro-meso-microporosity structure of the as-prepared hollow fibers can effectively enhance the accessibility of the feedstock to catalytic active sites and facilitates the mass transfer of targeted products, including ethene, propylene, aromatics, etc. Thus, the secondary reactions of ethene and propene as well as the carbon deposition could be hindered [12]. Ga2O3/ZSM-5 hollow fibers, which effectively combine the cracking function of ZSM-5, the hierarchical macro-meso-microporosity of hollow fibers, and the dehydrogenation of Ga2O3, show the best catalytic behavior among the four catalysts, with the highest yield of C2 = , C3 = , C4 = plus BTX at 600 °C by 87.6%, which is 56.3%, 24.6%, and 13.3% higher than ZSM-5, ZSM-5 zeolite fibers, and 0.3% Ga2O3/ZSM-5, respectively.…”

“…(A) (B) [12,36] except that the addition of NaOH and the synthesis was carried out at 100˝C for 72 h. When the synthesis was completed, the nanocrystals products were washed, dried, and calcined at 550˝C for 6 h in muffle furnace followed by ion-exchanged, dried, and calcined process. The zeolite prepared according to the above methods is denoted Nano-ZSM-5 (with an actual Si/Al of 55 determined by XRF).…”

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

“…The cumene conversion maintained at 90% after 100 pulses, while that of the conventional ZSM-5 decreased to 50%. Hierarchical ZSM-5 fibers with macro-, meso-, and micropores were prepared by electrospinning method [64]. The macroporous structure could be regulated by controlling the rates of inner fluid during coaxial electrospinning.…”