Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 3, pp. 456−460.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
V.Yu. Prokof’ev, V.V. Kuznetsov, S.M. Gruditsin, M.G. Kalashnikova, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82,
No. 3, pp. 462−466.
AND INDUSTRIAL ORGANIC CHEMISTRY
Catalysts of the vapor conversion of methane in
apparatus of a large unit capacity in which nickel is active
constituent, operate under exclusively severe condi-
tions: temperature in a range of 800−1000°C, pressure
2−35 MPa, an oxidizing medium (H
O, CO). As a whole this
necessitates high requirements to used contacts. In addition
to high activity it is necessarily that they possess required
mechanical strength and thermal resistance, stability under
working conditions, high selectivity to suppress such a side
reaction as coal-formation. Often a carrier of such catalysts
is alumina calcinated at temperature higher than 1000°C.
On various stage of a catalyst preparation promoters are
added in the catalyst composition for improving certain of
the operational properties of the system.
For example, calcium aluminates, and (or) magnesium
oxide or hydroxide are usual additives in the carrier
composition that increase mechanical strength and main
properties of the catalyst surface [1−3]. Disadvantage
of such additives is an essential (up to 50%) loss of
the strength as a result of hydratation of magnesium
and calcium compounds accompanied by the increase
in volume at feeding of a vapor−gas mixture on the
catalyst layer. Also in [4, 5] compounds of titanium are
suggested for employment. Aluminum titanate forming in
the mechano-chemical synthesis and the following high-
temperature treatment possesses a unique low coefﬁ cient
of thermal linear dilatation that provides high stability of
the catalyst. Alkaline and rare-earth metals, lanthanides
are applied frequently as additives . In particular, in [6,
7] it was showed that the stable operation of a catalyst,
Investigation of Catalyst Ni/K
for Vapor Conversion of Methane
V. Yu. Prokof’ev, V. V. Kuznetsov, S. M. Gruditsin, and M. G. Kalashnikova
Ivanovo State Chemical Technology University, Ivanovo, Russia
Received October 13, 2008
Abstract—An effect of raw material (aluminum oxide and hydroxide), of amount, and of technique of KOH feed
(solid or solution) on a composition of potassium aluminates formed at calcination. Reactivity of the obtaining
catalysts at the vapor conversion of methane was studied.
and suppression of the coal-forming even at low ratio
of vapor−gas in a reaction medium were provided with
help of these compounds. The attention should be paid to
potassium since it possesses a high catalytic efﬁ ciency
and it is the least expensive.
Actually an obligatory stage in a production of
the catalyst for the conversion of hydrocarbons is
the dispersion of raw materials where the mechano-
chemical synthesis of different catalyst constituents
may be facilitated. For example, calcium aluminates ,
aluminum titanate , and other compounds improving
operating characteristics of the contacts  were obtained
in this way. Thus synthesis of potassium aluminates in
the course of the carrier production is very promising.
The presence in the catalyst composition of potassium
aluminates enables both preparation of sufﬁ ciently solid
granules with a high porosity and a favorable inﬂ uence
on catalytic activity and selectivity due to intensiﬁ cation
of the main properties of the surface.
For improving the technological properties of the
system on the stage of granulation a parafﬁ n input at
grinding the raw components should be used [3, 5].
Moreover parafﬁ n burning out in the course of calcination
promotes formation of open porous structure of granules
Production and investigation of physicochemical
properties of nickel catalyst for the conversion of
methane with water vapor on the potassium aluminum
carrier prepared by various techniques is a purpose of
the presented paper.