Stability of mixed-phase alumina catalysts for ethanol dehydration reaction

Main Article Content

Jarurat Sumphanwanich
Bunjerd Jongsomjit


          Dehydration reaction is an important and basic technology for converting ethanol into ethylene product which temperature is less than pyrolysis reaction. It is also considered as alternative energy for future. Many researches improve and modify catalyst in order to obtain high selectivity. The selectivity factor mostly depends on acidity on a catalyst and temperature, which is catalytic early degradation.

          In this present study, the mixed gamma and chi crystalline phases of alumina catalyst calcined at 600 °C was employed for ethanol dehydration to ethylene. The mixed  g-and c-crystalline phase alumina was prepared by solvothermal method. The catalyst was performed for ethanol dehydration reaction under atmospheric pressure at temperature of 200-400 °C in a fixed-bed reactor. They exhibited both high conversion and high selectivity to ethylene more than 90% of interval temperature 350-400 °C. The catalyst was characterized by several techniques. However, the stability of these catalysts will be further investigated by reaction test at the specified temperature (300-400 °C) within time-on-stream (TOS) around 6 hrs. The coke formation will appear on the surface of spent catalysts. After TOS 12 hrs., the coke content reaches very high level, which affects to catalyst deactivation. Therefore, the operating condition (such a TOS and temperature) leads to generate coke deposited on the catalysts significantly. The different characteristics of the fresh and spent catalysts will be compared and discussed further.


Download data is not yet available.

Article Details

Research Article


Starokon, E. V., et al. (2014). "Epoxidation of ethylene by anion radicals of a-oxygen on the surface of FeZSM-5 zeolite." Journal of Catalysis 309(0): 453-459.

Shi, Y.-f., et al. (2001). "Kinetics for benzene+ethylene reaction in near-critical regions." Chemical Engineering Science 56(4): 1403-1410.

Sastri, V. R. (2014). 6 - Commodity Thermoplastics: Polyvinyl Chloride, Polyolefins, and Polystyrene. Plastics in Medical Devices (Second Edition). V. R. Sastri. Oxford, William Andrew Publishing: 73-120.

Sadrameli, S. M. (2015). "Thermal/catalytic cracking of hydrocarbons for the production of olefins: A state-of-the-art review I: Thermal cracking review." Fuel 140(0): 102-115

Korsunsky, A. M., et al. (2011). "Strain tomography of polycrystalline zirconia dental prostheses by synchrotron X-ray diffraction." Acta Materialia 59(6): 2501-2513.

Khom-in, J., Praserthdam, P., Panpranot, J., and Mekasuwandumrong, O. Dehydration of methanol to dimethyl ether over nanocrystalline Al2O3 with mixed y- and x - crystalline phases. Catalysis Communications 9(10) (2008): 1955-1958.

Chakraborty, A. and B. Sun (2014). "An adsorption isotherm equation for multi-types adsorption with thermodynamic correctness." Applied Thermal Engineering 72(2): 190-199.

Radovic, L. R. (Ed.). (2004). Chemistry & Physics of Carbon (Vol. 29). CRC Press.

Santacesaria, E., et al. (1977). "Basic behavior of alumina in the presence of strong acids." Industrial & Engineering Chemistry Product Research and Development 16(1) : 45-47.

Wang, F., et al. (2011). "Corrigendum to “Coking behavior of a submicron MFI catalyst during ethanol dehydration to ethylene in a pilot-scale fixed-bed reactor” [Appl. Catal. A: Gen. 393 (2011) 161–170]." Applied Catalysis A: General 398(1–2): 195.