Influence of process variables on the continuous alkylation of isobutane with 2-butene on superacid sulfated zirconia catalysts
- Instituto de Tecnologia Quimica, Valencia (Spain)
Two sulfated zirconia catalysts have been prepared by impregnation of zirconium hydroxide with H{sub 2}SO{sub 4} 0.3 N and 1 N. Both samples showed superacid sites as shown by a desorption temperature peak in the NH{sub 3} TPD at ca. 813 K. The activity and selectivity of these catalysts have been studied for the alkylation of isobutane with trans-2 butene in a computer-controlled continuous fixed bed reactor coupled with a sampling system which allows to make differential analysis of the products from very short reaction times. In this way, the influence of the main process variables, i.e, time on stream, reaction temperature, olefin WHSV, and isoparaffin/olefin ratio, on the 2-butene conversation and product distribution has been investigated. Cracking of larger carbocations and alkylation of isobutane with 2-butene to give trimethylpentanes were the predominant reactions occurring on the superacid catalyst in the initial stages of the reaction. The alkylation/cracking ratio increased when decreasing reaction temperature. A fast catalyst decay with time on stream was also observed, and this was accompanied by an increase in the oligomerization of butene. 23 refs., 5 figs., 4 tabs.
- OSTI ID:
- 110976
- Journal Information:
- Journal of Catalysis, Vol. 149, Issue 1; Other Information: PBD: Sep 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
A kinetic mechanistic study of acid-catalyzed alkylation of isobutane with C4-olefins at low temperatures
The effect of supercritical isobutane regeneration on the nature of hydrocarbons deposited on a USY zeolite catalyst utilized for isobutane/butene alkylation