Abstract
The role of NH + 4 , Na + , K + and Cs + cations was investigated in the synthesis of ZSM-5 using fluoride as mineralizing agent. The amounts of aluminum and alkali cations were varied in gels of initial composition 10SiO 2 – x MF– y Al(OH) 3 –1.25TPABr–330H 2 O with M=NH 4 , Na, K and Cs, x =9, 15 and 24, y =0.16, 0.5 and 1.0 and TPABr=tetrapropylammonium bromide. The potassium-containing system is the most effective one with respect to incorporation of aluminum into the zeolite framework, while the ammonium-containing system is the least effective one. Crystallization patterns and crystal morphologies are strongly influenced by the nature of the fluoride salt added to the reaction mixture. The kinetic data show that the cations not only influence the reaction rates by their electrostatic interaction, but also due to their specific interaction with the fluoride anion in various siliceous and aluminosiliceous complexes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
