Alkali-free synthesis of Al-MTW using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide as structure directing agent

作者：De Baerdemaeker Trees; Mueller Ulrich; Yilmaz Bilge^*

来源：Microporous and Mesoporous Materials, 2011, 143(2-3): 477-481.

DOI：10.1016/j.micromeso.2011.03.018

• Zeolite
• Alkali-free synthesis
• ZSM-12
• Fluoride-free synthesis
• Catalyst

Synthesis of MTW-type zeolites was carried out for the first time using 4-cyclohexyl-1,1-dimethylpiperazinium hydroxide as structure directing agent. An alkali-free and fluoride-free synthesis procedure for incorporation of aluminum into the MTW-framework was developed. Products were characterized using XRD, FE-SEM, HR-TEM, EDXS, ICP-OES, N(2)-sorption, Ar-sorption and NH(3)-TPD. The Al-MTW product from this new synthesis route is stable after calcination at 600 degrees C and has an open pore/channel system. The Si/Al ratio of the Al-MTW crystals was found to be 50. The NH(3)-TPD studies demonstrated that the new Al-MTW product has strong acid sites and can be directly utilized as a solid acid catalyst without going through any ion-exchange procedures. Utilization of seed crystals in Al-MTW synthesis was also investigated and its influence on product morphology was identified.

• 出版日期2011-9