Abstract
The ethanol conversion into hydrocarbons (light olefins and aromatics) using alkali-treated HZSM-5 with different SiO2/Al2O3 ratios (23, 38, and 53) zeolites was evaluated. The desilicated SAR 38 zeolite exhibited significant growth on the external surface area (61–212 m2/g) and the mesopore volume (0.07–0.37 cm3/g) without significate reduction on XRD crystallinity (93%). All catalysts were active on the ethanol conversion into hydrocarbons. At the same set of variables, the alkali-treated HZSM-5 zeolites showed a better conversion and a high selectivity to C4–C9 hydrocarbons when compared to the parent microporous zeolites. Only the parent HZSM-5 zeolite (SAR 53) was chosen for the statistical study using the standard response surface methodology in combination with the central composite design. It was found that maximum BTEX (benzene, toluene, ethylbenzene, and xylenes) and minimum ethylene production were reached for the following conditions: temperature 450 °C, pressure 20 bar, and WHSV (weight hourly space velocity) 5 h−1.
Highlights
Ethylene is mainly produced by steam cracking of crude oil derivatives
The results showed that, at 500 ◦ C, partial pressure of ethanol equal to 0.12 atm, and weight hourly space velocity (WHSV) equal to 6.5 h−1, the formation of propene was favored
The results revealed that HZSM-5 zeolites with a high SiO2 /Al2 O3 ratio (SAR) presented a fast deactivation and produced more unsaturated liquid compounds
Summary
Ethylene is mainly produced by steam cracking of crude oil derivatives. ethanol can be used as raw material for ethylene production. The choice of the authors to work at 200 ◦ C did not provide a good comprehension of how the textural modifications affected the reaction products diffusion, and all five catalysts showed stable ethanol conversion and ethylene selectivity with 12 h time-one-stream (TOS). Temperature, pressure, ethanol concentration, and weight hourly space velocity (WHSV) have a significant effect on the product distribution and catalyst activity on ethanol conversion over ZSM-5 zeolite. Sousa et al [10] investigated the influence of reaction conditions on ethanol conversion into olefins and aromatics over acidic ZSM-5 zeolites. In addition to the reaction parameters, Ramasamy et al [8] studied the effect of SiO2 /Al2 O3 ratio (SAR) on the products distribution of ethanol conversion to hydrocarbons over HZSM-5 zeolites. Efficiently explore the possibilities of interactions among reaction conditions
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