Patent ID: 8575055

Claim:
A surface-modified zeolite having metal oxide-enriched external surfaces, comprising: an ammonium-form zeolite, a hydrogen-form zeolite or a sodium-form zeolite having external surfaces; wherein the zeolite is selected from the group consisting of MFI, MEL, MTT, MWW, TON, TUN, EUO, IMF and FER zeolites; a coating on the external surfaces comprised of a metal oxide selected from the group consisting of, SiO 2 and TiO 2 , SiO 2 and ZrO 2 , and SiO 2 , TiO 2 , and ZrO 2 ; and wherein said surface-modified zeolite comprises zeolitic pores that are narrowed to facilitate passage of smaller molecules and prevention of passage of bigger molecules from entering or exiting the zeolitic pores.