The study of Ti doped ZSM-5 particles and cavities inside them

The TEM study of titanium-containing ZSM-5 zeolite before and after hydroth ermal treatment was performed. The use of different TEM techniques, such as conventional TEM, HRTEM and EDX-line scans provides important information about the microscopic structure of the zeolite catalyst consisting from sev eral phases. The hydrothermal treatment of zeolite powder leads to strong c hanges in the morphology of the constituting particles. They are characteri zed by a homogeneous structure before hydrothermal treatment while the occu rrence of holes after thermal treatment was observed, These changes lead to the enrichment of zeolite with titanium which obviously enhance its cataly tic activity. Some of the titanium surplus precipitates as TiO2 anatase nan oparticles within the holes. (C) 2001 Elsevier Science B.V. All rights rese rved.