Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 1, pp. 76−83.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
Kh.Kh. Gil’manov, R.G. Romanova, A.A. Lamberov, R.R. Gil’mullin, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83,
No. 1, pp. 78−85.
AND INDUSTRIAL ORGANIC CHEMISTRY
Effect of the Catalyst Structure on the Catalytic Activity
in Dehydrogenation of 2-Methyl Butane
Kh. Kh. Gil’manov
, R. G. Romanova
, A. A. Lamberov
, and R. R. Gil’mullin
Nizhnekamskneftekhim, Open Joint-Stock Liability Company, Nizhnekamsk, Tatarstan, Russia
Kazan State Technological University, Kazan, Tatarstan, Russia
Kazan State University, Kazan, Tatarstan, Russia
Received March 10, 2009
Abstract—Calorimetry, thermogravimetry, X-ray diffraction analysis, and low-temperature adsorption of nitrogen
were used to study the structure of bimetallic Pt–Sn catalysts on zinc-alumina spinel supports. The effect of the
porous structure of the catalyst samples synthesized on their catalytic activity in dehydrogenation of 2-methyl
butane was analyzed.
The dehydrogenation of light parafﬁ n hydrocarbons,
one of the most large-tonnage processes in petrochemical
and organic syntheses, can produce unsaturated
compounds used as monomers in manufacture of
macromolecular compounds. In this context, development
of high-efficiency catalysts for dehydrogenation of
parafﬁ ns is presently a priority area, because manufacture
of synthetic caoutchoucs, including those of isoprene
type, is the best developed ﬁ eld of petrochemical industry,
both in Russia and in the entire world.
Single-stage dehydrogenation of 2-methyl butane
to isoprene under atmospheric pressure in steam in the
presence of platinum-containing catalysts should be
attributed to one of promising ways to obtain isoprene
[1–5]. This process and a catalyst of IM-22101 brand
have been jointly developed by Yarsintez Open Joint-
Stock Company, Research-and-Production Enterprise and
Institute of Catalysis, Siberian Branch, Russian Academy
of Sciences. The process employs spinel-supported
platinum modiﬁ ed with tin additives as a catalyst.
To advantages of supported bimetallic catalysts over
the alumina-chromia catalysts conventionally used
in vacuum dehydrogenation belongs the possibility
of synthesizing isoprene from 2-methyl butane under
atmospheric pressure. This can be done because these
catalysts, fabricated on spinel supports, are stable both at
high temperatures and in steam. The process outperforms
in its main service characteristics the existing two-stage
process for production of isoprene, single-stage method
for vacuum dehydrogenation of 2-methyl butane, and the
formaldehyde technique for synthesis of isoprene.
Despite the sufﬁ ciently large number of studies
devoted to single-stage dehydrogenation with
bimetallic catalysts, the problem of raising the yield of
dehydrogenation products still remains topical. Because
the manufacture of isoprene is large-tonnage, raising the
yield of isoprene even by 1 wt % substantially improves
the efﬁ ciency of the process by diminishing the cost of
ﬁ nished products.
The goal of our study was to develop an efﬁ cient
catalyst for single-stage dehydrogenation of methane by
revealing the relationship between structural parameters
of the catalyst and its catalytic properties in production
of isoprene by dehydrogenation of 2-methyl butane.
The surface and structural properties of the catalysts
and supports were studied by means of X-ray diffraction
analysis, thermal desorption of nitrogen, and calorimetric
and thermogravimetric analyses.
The adsorption measurements for determining the