Positional isomerization of butene-2 over nanoporous MCM-48 catalysts.
Positional isomerization of butene-2 to butene-1 was investigated over nanoporous MCM-48 catalysts. The effects of the method and the amount of aluminum incorporation into MCM-48 on the catalyst characteristics were studied, with respect to the butene-2 isomerization reaction. Incorporation of aluminum into MCM-48 using a post-synthetic grafting method (P) or direct sol-gel method (D) increases the total acid amount due to the increase in the Lewis acidity level. From the results of butene-2 isomerization, the yield of butene-1 was increased although the selectivity of butene-1 was decreased due to an increase of byproducts such as i-butene, cracked fraction, and C5+ hydrocarbons. This trend is nearly identical over both catalyst preparation methods; the effect of Al incorporation method on the butene-1 yield and the selectivity appeared negligible. The maximum yield of butene-1 was 27.1 wt% by feeding pure butene-2 in the reaction condition as follows: a temperature of 450 degrees C, atmospheric pressure, and with the WHSV at 70 h(-1).
Department of Chemical Engineering, Kongju National University, Gongju 314-701, Korea.
Nansuk
N
You
Jin-Heong
JH
Yim
Seong Jun
SJ
Lee
Jae Ho
JH
Lee
Young-Kwon
YK
Park
Jong-Ki
JK
Jeon
D002070:Butadienes / Q000737:chemistry*; D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D007536:Isomerism; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
D002070:Butadienes; D046911:Macromolecular Substances