Study of the Process of Joint Transformation of Propane-Butane Fraction and n-Heptane over Modified Zeolites

被引：1

作者：

Velichkina, L. M. ^{[1
]}

Barbashin, Ya E. ^{[1
]}

Vosmerikov, A. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Siberian Branch, Inst Petr Chem, Tomsk, Russia

来源：

CHEMISTRY FOR SUSTAINABLE DEVELOPMENT | 2018年 / 26卷 / 02期

关键词：

zeolite ZSM-5; metal powders; porosity; acidity; conversion; activity; selectivity; propane-butane fraction; n-heptane;

D O I：

10.15372/CSD20180202

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

High-silica ZSM-5-type zeolite with silica module of 40 was produced by hydrothermal synthesis using hexamethylenediamine as a structure-forming additive. Its belonging to the pentasyl family and crystallization degree were determined by IR spectroscopy and X-ray phase analysis. Metal-containing zeolite catalysts were prepared by mechanical mixing of zeolite with powders of nickel and zirconium with a medium particle size of 50 nm and those of rhenium with that of 770 nm in terms of 0.5 mass %. The specific surface area of samples and parameters of their porous structure were determined by BET according to lowtemperature nitrogen adsorption, acidic characteristics - by temperature-programmed ammonia desorption. It was demonstrated that the introduction of metals into zeolite reduced its specific surface area, pore volume, and acidity. The catalytic activity of metal-containing zeolites was studied during the transformation of propane-butane fraction and n-heptane. It was found that during their joint transformation over unmodified zeolite, the yield of the liquid product and the content of isoalkanes therein were higher than in case of conversion of only n-heptane. The addition of metals to zeolite led to a decrease in the concentration of n-alkanes, arenes, and alkenes in the resulting liquid products over catalysts and to a simultaneous increase in the fraction of iso- and cycloalkanes therein. Modification of zeolite with rhenium and zirconium increased formation selectivity of isoalkanes, while the introduction of nickel - that of aromatic hydrocarbons. The resulting zeolites might be used as the main component of catalysts for the gentrification of the straight-run gasoline fraction of oil during its joint conversion with hydrocarbon gases.

引用

页码：115 / 124

页数：10

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