Appeal No. 2002-0864
Application 09/022,817
APPEALED SUBJECT MATTER
The subject matter on appeal is directed to a process
for treating a combustion exhaust gas containing NOx, SOx and
mercury wherein a specific amount of a mercury chlorinating
agent, together with ammonia, is added to the combustion exhaust
gas in the presence of a particular denitrating catalyst to
remove nitrogen oxides while simultaneously converting mercury-
containing compounds to mercury chlorides. See the specifica-
tion, pages 6 and 7. Details of the appealed subject matter are
illustrated in representative claim 1 which is reproduced below:
1. A process for treating combustion exhaust gas
comprising:
adding a mercury chlorinating agent and ammonia to
combustion exhaust gas containing Nox, Sox, and mercury to carry
out removal of nitrogen oxides from the exhaust gas in the
presence of a solid catalyst comprising: (1) a carrier comprised
of at least one compound selected from the group consisting of
TiO2, SiO2, ZrO2, and zeolite, and (2) at least one element
selected from the group consisting of Pt, Ru, Ir, V, W, Mo, Ni,
Co, Fe, Cr, Cu, and Mn, wherein said element is carried by said
carrier, and wherein the mercury chlorinating agent is added in
an amount greater than the stoichiometric amount relative to the
mercury present in the exhaust gas to produce a mercury chloride;
and
wet-desulfurizing the denitrated exhaust gas using an
alkaline absorbing unit.
2
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