1070-4272/04/7709-1491C2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 9, 2004, pp. 1491!1499. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 9,
2004, pp. 1501!1509.
Original Russian Text Copyright + 2004 by Dul’nev, Efremov, Obysov, Golosman, Yakerson.
Ni!Cu Catalysts on Ceramic Supports
A. V. Dul’nev, V. N. Efremov, M. A. Obysov, E. Z. Golosman, and V. I. Yakerson
Novomoskovsk Institute of Nitrogen Industry, Open Joint-Stock Company, Novomoskovsk, Tula oblast, Russia
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
Received April 5, 2004
Abstract-The physicochemical and catalytic characteristics of catalysts fabricated on ceramic supports
of various types was studied. The influence exerted by addition of cobalt and manganese on the catalytic
activity of supported nickel3copper catalysts in high-temperature treatment of off-gases to remove nitrogen
oxides was studied.
It is known that catalysts based on noble metals,
such as platinum, palladium, ruthenium, rhodium, and
iridium, exhibit unique catalytic properties, and
primarily polyfunctionality, which is responsible for
their wide use in various catalytic processes, especial-
ly those intended for treatment of off-gases to remove
noxious impurities [1, 2]. However, despite all their
advantages, these catalysts are exceedingly expensive
and their operation leads to irrecoverable loss of noble
metals. In this context, a ceaseless search for catalytic
formulations that contain no noble metals is being
conducted. One of formulations of this kind is the
nickel3copper catalytic system, which is employed in
quite a number of catalytic processes, because it also
exhibits polyfunctionality . There is evidence
that nickel3copper systems are close in their catalytic
properties to platinum .
Among the most widely used methods for fabrica-
tion of nickel3copper catalysts are fusion with sub-
sequent leaching, mixing, coprecipitation of compo-
nents, and deposition of the active component onto a
support by impregnation. Since the requirements to
a catalyst for treatment of off-gases demand that it
should have a high activity, mechanical strength, and
stability in operation at high temperatures and space
velocities, as well as an invariably low hydraulic
resistance, the last of the above-mentioned techniques
seems to be the most promising, because the support
can satisfy most of these requirements .
The aim of this study was to examine supported
nickel3copper catalysts with addition of cobalt and
manganese, which are fabricated using various sup-
ports and are intended for use in detoxication of off-
gases and, in particular, for treating these gases to
remove nitrogen oxides.
Samples were prepared on ceramic supports used
in fabrication of catalysts of NIAP-18
 brands for conversion of natural
gas with steam, which show good working character-
istics, as well as on a cellular block support. An an-
nular pelletized ceramic support of the NIAP-18
catalysts is fabricated by high-temperature calcination.
The support of the NIAP-03-01 catalyst, which is
produced by slip casting followed by high-temperature
calcination, has an intricate geometric shape with
seven apertures . The cellular support is composed
of a highly porous cellular material (HPCM) obtained
by replication of cellular polymeric matrices (foamed
polymers) by deposition of inorganic coatings on
these matrices and their subsequent thermal treatment,
during which the organic component burns out and the
cellular structure of the block support is formed .
A structure of this kind has a developed geometric
surface and low hydraulic resistance and provides an
increased mass-exchange coefficient and the most
efficient utilization of the deposited active component
. The basic characteristics of the supports used are
listed in Table 1.
The catalysts were prepared by impregnation of
supports with aqueous solutions of Ni(II), Cu(II),
Co(II), and Mn(II) nitrates. As starting substances
O, and Mn(NO
O. The supports were
submerged in an impregnating solution and kept there
at 6oC for 1.5 h.
The impregnated samples were dried and then cal-
cined at 400oC for 4 h. Depending on the goal of an
Former name GIAP-18.
Former name NIAP-22.