1632-70-8Relevant articles and documents
Synthesis, characterization and isomerization performance of micro/mesoporous materials based on H-ZSM-22 zeolite
Liu, Suyao,Ren, Jie,Zhang, Huaike,Lv, Enjing,Yang, Yong,Li, Yong-Wang
, p. 11 - 23 (2016/01/20)
Micro/mesoporous materials with different mesoporosities were prepared through recrystallization of H-ZSM-22 zeolite in alkaline solution with cetyltrimethylammonium bromide template (CTAB). The structure, morphology, pore properties, acidity and isomerization performance of the catalysts by using the resulting materials were characterized and assessed. The dissolution and recrystallization procedure introduced the well-developed mesoporous structure of MCM-41 type with the meso-scale channels of about 3 nm in size on the outer surfaces of the microporous H-ZSM-22 zeolites, forming the micro/mesoporous materials, which possessed increased weak B acid sites at the pore mouths and a reduced amount of total acid sites. It is shown that the presence of well-developed mesopores could remarkably improve the selectivity to multi-branched products and suppress the side cracking reactions in n-dodecane isomerization. The micro/mesoporous Pt/ZSM-22/MCM-41 bifunctional catalyst with suitable recrystallization degree exhibits high isomerization selectivity under high conversion in long-chain n-alkane isomerization compared to the original microporous Pt/H-ZSM-22 catalyst.
1-Hexene: A renewable C6 platform for full-performance jet and diesel fuels
Harvey, Benjamin G.,Meylemans, Heather A.
, p. 770 - 776 (2014/02/14)
A highly efficient and selective process has been developed for the conversion of 1-hexene to jet and diesel fuels. In combination with commercial processes for the dehydration of ethanol and trimerization of ethylene, this work provides a basis for the synthesis of full-performance hydrocarbon fuels from bio-ethanol. Selective oligomerization of 1-hexene with a Cp 2ZrCl2/MAO catalyst at ambient temperature and pressure resulted in 100% conversion of 1-hexene with >80% selectivity to a mixture of the dimer and trimer. The hydrogenated dimer had a -20 °C viscosity of only 3.5 mPa s, an exceptionally low freezing point of -77 °C, and a cetane number of 67 suggesting that it has performance characteristics suitable for both jet and diesel fuels. The hydrogenated trimer had a flash point of 128 °C, a cetane number of 92, a 40 °C viscosity of 3.1 mPa s, and a -20 °C viscosity of 24.5 mPa s. These properties suggest that the trimer has applications as a high-performance diesel fuel. In addition to the fuel-range hydrocarbons, heavier oligomers have potential as biolubricants which improves the carbon yield of useful products to near quantitative levels.
RADIATION CHEMISTRY OF N-HEXANE AQUEOUS SOLUTIONS AS STUDIED BY CHROMATOGRAPHIC ANALYSIS OF FINAL PRODUCTS
Doncker, J. de,Tilquin, B.
, p. 107 - 113 (2007/10/02)
Radiolysis of dilute oxygen-free hexane aqueous solutions give dodecanes isomers analyzed by capillary gas chromatography.The relative yields for radicals which react by radical-radical recombination reactions are 39 percent, 32 percent and 29 percent for primary hexyl radical, secondary-2 hexyl radical and secondary-3 hexyl radical respectively.This distribution is changed with the N2O saturation before the radiolysis to 22 percent, 42 percent and 37 percent.If the first distribution is statistic, the increase of OH. available to attack the solute gives the distribution existing in pure alkane radiolysis.
