Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 10, pp. 1742−1749.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
T.M. Boichuk, V.L. Struzhko, S.N. Orlik, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 10, pp. 1602−1609.
INORGANIC SYNTHESIS AND INDUSTRIAL
Reduction of N
O and NO over H-ZSM-5- and ZrO
Iron- and Cobalt-Containing Catalysts
T. M. Boichuk, V. L. Struzhko, and S. N. Orlik
Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine
Received December 1, 2009
Abstract—The combined conversion conditions were examined for the reactions of decomposition and
reduction of N
O and NO with С
hydrocarbons, in particular, in gas mixtures containing oxygen and
sulfur dioxide, over Fe- and Со-containing catalysts supported on zeolites and zirconia, as well as on structured
The atmospheric emission of nitrogen oxides N
belonging to the most hazardous greenhouse gases is 30
mln ton annually, with the contribution from man-made
contaminants dominating. The current level of N
in the atmosphere is estimated at 0.6 mg m
level exceeds the NO
concentration by 1–2 orders of
magnitude. At the same time, the annual increment of
nitrogen(I) oxide concentration is estimated at 0.2–
0.3%. Nitrous oxide contributes to greenhouse effect
with 6% [1, 2].
To achieve the greenhouse gas emission reduction
targets, as recently agreed by countries of the world,
it is necessary to develop and implement efﬁ cient
relevant technologies. Among them, a prominent place
is occupied by catalytic techniques, in particular, those
for removal of nitrogen oxides from gas emissions.
A signiﬁ cant proportion (29%) of N
is accounted for by chemical industry, in particular, by
adipic and nitric acid production facilities. The following
catalytic procedures are promising for neutralization
of dilute exhaust gases (<1% N
O) from nitric acid
production and solid fuel combustion plants: (a) direct
decomposition of nitrogen(I) oxide; (b) N
with carbon monoxide or hydrocarbons; and (c) selective
reduction (SCR process) for oxygen-containing nitrous
gases. Published data suggest that, in designing catalysts
for decomposition of N
O contained in “tail” gases, of
critical importance is suppression of the inhibitory effect
of oxidants (NO, SO
There exist processes for selective reduction of
with various reducing agents, aimed at removal of
nitrogen oxides from oxygen-containing gas emissions.
At the same time, the search for suitable catalysts and
elucidation of the conditions of combined reduction of
nitrogen(I, II) oxides with hydrocarbons holds much
The above-mentioned environmental problems
are preferably solved today with the use of structured
monolith-supported catalysts. The latter offer advantages
in terms of a broad spectrum of design options, low
hydraulic resistance, and easy arrangement in reactors.
As known, toxic organics, hydrogen sulﬁ de, and
nitrogen oxides are removed from exhaust gases at high
gas ﬂ ow velocities with the use of ceramic honeycomb-
supported catalytic compositions [5, 6].
Here, we determined the conditions for combined
conversion of N
O and NO in gas mixtures comprising
oxygen and sulfur dioxide over Fe- and Со-containing
catalysts supported on zeolites and zirconia, including
honeycomb monolith-supported catalysts.
We examined the N
O and NO conversion over Fe-
and Co-containing catalysts supported on H-ZSM-5
zeolite, zirconia, (H-ZSM-5 + ZrO
) binary support,