ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 2, pp. 238−242. © Pleiades Publishing, Ltd., 2016.
Original Russian Text © G.S. Bozhenkova, I.S. Khomyakov, T.A. Gerasina,
2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 2, pp. 230−234.
Pore Structure and Acid Properties
of High-Silica Zeolites Synthesized with Different
Templates and Their Catalytic Performance
in Conversion of the Propane–Butane Fraction
G. S. Bozhenkova, I. S. Khomyakov, and T. A. Gerasina
Tomsk Polytechnic University, pr. Lenina 30, Tomsk, 634050 Russia
Received February 9, 2015
Abstract—The effect of the template on the physicochemical properties of zeolitic catalysts and on the yield and
selectivity of formation of aromatic hydrocarbons in conversion of the propane–butane fraction was examined.
The zeolitic catalyst sample synthesized with an alcohol fraction as template is characterized by the highest val-
ues of the acid site concentration, adsorption capacity, micropore volume, and speciﬁ c surface area. Therefore,
this catalyst ensures the highest, compared to the other samples, conversion of the propane–butane fraction and
yield of aromatic hydrocarbons.
Large amounts of hydrocarbon resources available
in Russia are utilized inefﬁ ciently. These include
natural and casinghead gases, coal, oil residues, etc.
Such raw materials can be sources for producing
additional amounts of valuable products. Until recently,
a signiﬁ cant fraction of hydrocarbon components of
natural, casinghead, and oil reﬁ nery gases was used only
as process fuel or was simply burnt in ﬂ ares and did not
ﬁ nd use in synthesis of chemical products. It seems more
appropriate and economically advantageous to convert
off-gases from oil extraction and reﬁ ning into a
stable phase (liquid or “dry gas”) on catalysts. Therefore,
researchers’ attention is focused on the development of
processes and new catalysts allowing nontraditional raw
materials, irrevocably lost previously, to be involved
into a production process [1–4]. One of promising
directions of reprocessing light hydrocarbons is the
conversion of С
hydrocarbons into alkenes and
aromatic hydrocarbons on MFI zeolites (Mobil Five).
In this study, we examined the catalytic activity of
zeolite-containing catalysts in the conversion of the
propane–butane fraction (PBF). We compared their
performance with that of the commercial catalyst and
examined the role of structural and acid properties in
As investigation objects we chose high-silica
zeolites of MFI type with the SiO
ratio of 50.
Zeolite samples were prepared from alkaline alumina–
silica gels at 170–180°С for 4–6 days using various
organic templates: hexamethylenediamine (ZCE-H)
, ε-caprolactam (ZCE-CL) , and alcohol fraction
(ZCE-AF) , and also KN-30 commercial catalyst
used for this process.
After the synthesis, the zeolites prepared were
washed with distilled water, dried at 110°C, and calcined
at 600°С for 6 h. The zeolites were converted to the
active hydrogen form by treatment with a 25% NH
solution at 90°С for 2 h, followed by drying at 110°C
and calcination at 600°С for 6 h (the Na
of the decationized zeolites was less than 0.1%). The
samples were identiﬁ ed by IR spectroscopy (Nicolet
6700 Fourier IR spectrometer) and X-ray phase analysis
(Shimadzu XRD–6000 X-ray diffractometer, Cu anode).