Synthesis of gallosilicates — MTW-type structure zeolites: Evidence of Ga-substituted T atoms

Y. Xing Zhi , A. Tuel (1) , Y. Ben Taarit (1) , C. Naccache (1)

1 IRC - Institut de recherches sur la catalyse

Gallosilicates with the ZSM-12 structure have been synthesized from the reaction mixture of sodium silicate, gallium nitrate, and methyl triethylammonium bromide at 353 K in an autoclave. XRD results associated with an i.r. study of the lattice vibrations indicated that highly crystalline materials with the ZSM-12 structure were obtained. 71Ga MAS n.m.r. studies along with 29Si measurements showed that Ga is in tetrahedral positions and the Si/Ga atomic ratio = 70. T.p.d. of ammonia adsorbed on H-GaZSM-12 clearly showed the acid nature of the material, which supports strongly the presence of Ga3+ in the zeolite framework.

Domaines: Catalyse

Y. Xing Zhi, A. Tuel, Y. Ben Taarit, C. Naccache. Synthesis of gallosilicates — MTW-type structure zeolites: Evidence of Ga-substituted T atoms. Zeolites, 1992, 12, pp.138-141. ⟨10.1016/0144-2449(92)90073-X⟩. ⟨hal-00006300⟩