Catalyst for purifying an exhaust gas

Details Catalyst for purifying an exhaust gas Catalyst for purifying an exhaust gas

1996-06-19

1997-10-14

Bell, Mark L.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 66, 502 71, 502 73, 502 74, 502 77, 4232392, 423713, B01J 2946, B01J 2948

Patent

active

056772548

ABSTRACT:
This invention relates to a catalyst for purifying an exhaust gas, which has a denitrification property in the lean atmosphere and good durability and is hardly deteriorated even in a high temperature rich atmosphere. The feature thereof consists in a catalyst for purifying an exhaust gas, comprising a crystalline silicate having the specified X-ray diffraction pattern and a chemical composition represented by the following chemical formula in the term of mole ratios of oxides under dehydrated state,
in which R is at least one of alkali metal ions and hydrogen ion, M is at least one elementary ion selected from the group consisting of Group VIII elements of Periodic Table, rare earth elements, titanium, vanadium, chromium, niobium, antimony and gallium, M' is an alkaline earth metal ion selected from magnesium, calcium, strontium and barium ions, a>0, 20>b.gtoreq.0, a+c=1 and 3000>y>11, on which (I) at least one member selected from platinum group metals and (II) at least one metal selected from platinum group metals and at least one metal selected from the group consisting of rare earth elements are supported.

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