The FT-IR transmission spectra for nanosized mordenite without
organic templates are shown in Fig. 4. Typical vibrations for mordenite
are observed (asymmetric stretching: external 1225 cm1,
internal 1050 cm1; symmetric stretching: external 800 cm1,
internal 720 cm1; double ring: 580 and 560 cm1; T–O bending;
450 cm1)