Selective Propylene Production from Methanol Using Monolithic Ge-Modified ZSM-5 Nanocatalysts

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Shehni Siamak; Tabatabaei Ghomsheh Seyed Mostafa

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Journal Paper

Paper Information

Journal: JOURNAL OF NANOSTRUCTURES Year:2025 | Volume:15 | Issue:3 Page(s): 1151-1167

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Title

Selective Propylene Production from Methanol Using Monolithic Ge-Modified ZSM-5 Nanocatalysts

Author(s)

Shehni Siamak | Tabatabaei Ghomsheh Seyed Mostafa | Issue Writer Certificate

Keywords

Ge-ZSM-5

Methanol

nanocatalyst

Propylene

Zeolite

Abstract

In this study, we investigated the selective production of propylene from methanol using monolith-structured ZSM-5 and germanium-modified ZSM-5 nanocatalysts within a fixed-bed reactor system. Optimal reaction conditions were established as 500 °C, 1 bar pressure, and a weight hourly space velocity (WHSV) of 15 h⁻¹, with methanol as the feedstock. To assess the physical and chemical characteristics of the pelletized parent, Ge-modified, and monolith-structured HZSM-5 nanocatalysts, we utilized various analytical techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analysis, and ammonia temperature-programmed desorption (NH3-TPD). NH3-TPD results indicated a reduction in acidity for the Ge-modified HZSM-5 nanocatalyst, attributed to the partial elimination of strong acid sites. XRD patterns confirmed the presence of the washcoat on the monolith-structured support. Additionally, SEM images of the Ge-modified and monolith-structured HZSM-5 nanocatalysts showed no change in the crystallinity of HZSM-5, while demonstrating a uniform nanocatalyst coating within the channels of the monolith-structured support. The most effective modified nanocatalyst was achieved by incorporating 0.1 wt% germanium into ZSM-5, which resulted in a substantial enhancement of propylene selectivity by 53% and yield by 22.1%. Among the monolith-structured nanocatalysts, variations with single-layer, double-layer, and triple-layer coatings of HZSM-5 were prepared. The single-layer HZSM-5 monolith-coated nanocatalyst exhibited the most significant improvements, with propylene selectivity increasing by 55% and yield by 28.4%. These improvements were attributed to enhanced internal diffusion and reduced mass transfer resistances within the monolith channels, leading to shorter residence times and reduced aromatic formation

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