Kinetic Modeling of Methanol-to-Olefin Reaction over ZSM-5 in Fluid Bed

Abstract

The methanol to olefins reaction has been studied in a small scale fluidized bed reactor over a phosphorus modified ZSM-5 catalyst. The product distribution was relatively insensitive to either feed rate or inlet gas composition. It was more sensitive to temperature with a significant increase in light olefins when the temperature was increased from 400 to 550 °C. A model based on the hydrocarbon pool mechanism is proposed in which olefins form through reversible reactions with a high molecular weight hydrocarbon species in catalyst pores and intersections. Agreement between the model and the product distribution of the olefinic species is good throughout the temperature interval investigated. Further experimental work is required to adequately characterize the paraffin and C 6+ fractions.

Reaction pathway and kinetics of C3–C7 olefin transformation over high-silicon HZSM-5 zeolite at 400–490°C

“…FT-IR studies and theoretical calculations [34,35] showed that water adsorbed on the active site through H-bond with the acidic -OH group on the zeolite, thus occupied a portion of active sites [36,37].…”

Kinetic modelling for the transformation of bioethanol into olefins on a hydrothermally stable Ni–HZSM-5 catalyst considering the deactivation by coke

“…The MTO process is performed with SAPO-34 catalyst, although it was originally studied using HZSM-5 zeolites and is still being studied due to the possibilities for modifying this zeolite acid structure [28,[47][48][49][50][51][52]. The main similarities to highlight are: temperature is similar (around 400 • C in the MTO process); the main objective is the same (selective propylene production); water is co-fed in both processes (in the MTO process to attenuate deactivation by coke) and their kinetic schemes are very similar, with C 2 -C 4 olefins as intermediates and the formation of paraffins and aromatics as by-products.…”

Simulation of methanol-to-olefin reaction over SAPO-34 catalysts with different particle sizes: Formation of active sites and deactivation

“…The simulation provided yield profiles of the lower olefins that were highly coincident with the experimental ones. The importance of the temperature effect on the composition of lower olefins in the MTO reaction over the phosphorous-modified ZSM-5 catalyst was confirmed by the simulation based on a hydrocarbon pool mechanism [18].…”