| 摘要 |
A catalyst for exhaust gas purification having a crystalline silicate including an oxide of an alkali metal and/or hydrogen ion, aluminum oxide, an oxide of an alkaline earth metal, Ca, Mg, Sn, or Ba, an X-ray diffraction pattern described in Table 1 in the specification, and containing at least one metal from the group consisting of the elements in Groups Ib and VIII of the periodic table, rare earth elements, titanium, vanadium, chromium, antimony, zinc, and manganese. With the use of a crystalline silicate containing alkaline earth elements together with other metals or with a composite structure of catalyst, the separation of aluminum or other metals from the crystal lattices (dealuminization or demetallization) can be controlled, and heat and steam resistance may be achieved.
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