1-Hexene Double Bond Isomerization Reaction Over SO 4 = Promoted NiO, Al2O3 and ZrO2 Acid Catalysts

Abstract

Sulfated mixed oxides, SO 4 = /Ni-Al-O and SO 4 = / Zr-Al-O were evaluated for double bond isomerization (DBI) of 1-hexene using helium and hydrogen as carrier gases. The increase of temperature from 100 to 200°C seems to favor the deprotonation pathway and contribute to increase the 1-hexene conversion for both catalysts and without regard of the carrier gas. The results indicate that temperature it is the main factor that contributes to improve both conversion and selectivity towards (cis ? trans)-2-hexene, while the reductive atmosphere beneficiate only the SO 4 = /Ni-Al-O catalyst performance, as hydrogen prevents this catalyst from a fast deactivation.

Propylene synthesis via isomerization–metathesis of 1-hexene and FCC olefins

“…Side reactions, such as polymerization are negligible. [74][75][76] It was demonstrated that under these conditions, HBEA is highly robust. No catalyst deactivation was observed during a time on stream (TOS) of 10 h. The ISOMET of 1-hexene with ethylene was performed at 3 bar total pressure of and at ethylene/1-hexene molar ratio of 10.…”

1-Hexene Isomerization Over Nano-crystalline Zeolite Beta: Effects of Metal and Carrier Gases on Catalytic Performance

“…Both 2-hexene and 3-hexene were found to be primary products over nano-crystalline zeolite beta catalyst, indicating formation of double-bond isomers directly from 1-hexene at lower temperature. The reaction involves the migration of only one hydrogen atom instead of an alkyl group, as a result of which double-bond shift reaction is faster than skeletal isomerization [22]. Skeletal isomerization of 2-hexene and 3-hexene leads to branched olefins as secondary products with increase in reaction temperature.…”