CATALYTIC CRACKING CATALYST OF NITROGEN OXIDE AND USE THEREOF

PURPOSE:To remove nitrogen oxide in good stability by bringing the titled catalyst, which has a specific lattice plane interval and prepared by containing a copper ion in crystalline aluminosilicate having a specific SiO2/Al2O3 mol ratio, into contact with nitrogen-oxide-containing gas. CONSTITUTION:In a method for removing nitrogen oxide from nitrogen oxide- containing gas, a catalyst, which has a specific value (e.g., 11.1+ or -0.3,-) as a lattice plane interval (d-value) in powder X-ray diffraction and prepared by containing a copper ion in crystalline aluminosilicate of which the SiO2/Al2O3 mol ratio is 20-100, is brought into contact with nitrogen oxide-containing gas. This catalyst is obtained by exchanging the cation in zeolite being a catalyst substrate having a specific structure with the copper ion. This copper ion exchange ratio is pref. 40-100%. This catalyst has high steady activity as a catalytic cracking catalyst of NO and keep its activity as it is even in the coexistence of SOX.