Mg2+-derived mesoporous ultra-high silica twelve-membered-ring basic zeolites: straightforward synthesis and catalytic performanceElectronic supplementary information (ESI) available: Fig. S1-S5. See DOI: 10.1039/c5ce02075a

• Main Authors: Xie, Jingyan, Wen, Haimeng, Zhang, Wei, Zhou, Yu, Wang, Jun
• Format: Journal Article
• Published: 09.02.2016
• DOI: 10.1039/c5ce02075a

Mg 2+ -derived mesoporous ultra-high silica twelve-membered-ring zeolites with multiple topologies (MOR, BEA and MTW) were straightforwardly synthesized by a one-pot route, where the crucial step was the co-hydrolysis/condensation of silica source and magnesium salt under moderate acidic conditions. SiO 2 /Al 2 O 3 ratios can be adjusted from ∼30 to as high as 410, thus generating superior basicity that was further improved by the incorporation of Mg species. A mesoporous structure was self-formed without the assistance of any template or special strategy. Catalysis tests showed high activity of these zeolites in a typical base reaction, Knoevenagel condensation, even for the bulky substrates due to the enhanced mass transfer arising from the mesopores. This methodology provides a promising approach towards target synthesis of valuable Mg 2+ -derived mesoporous ultra-high silica zeolites with tunable acid/base properties, which can even act as an efficient mesoporous zeolitic solid base. Mg 2+ -derived ultra-high silica mesoporous zeolites are synthesized by acidic pre-co-hydrolysis/condensation and act as an efficient zeolitic solid base in Knoevenagel condensations.