Synthesis of MCM-48 by microwave-hydrothermal process

Abstract

MCM-48 was synthesized using the microwave hydrothermal method. The material was characterized by means of powder XRD, NMR, sorption measurement, SEM and transmission electron microscopy (TEM). XRD, NMR confirm the topology of the silicate framework, TEM shows the periodicity and homogeneity of the MCM-48 frame structure. However, from TEM it is clear that there is structural disorder. Beside MCM-48 a mesoporous wormhole like structure coexists. This is reflected in the lowering of the surface area and pore volume compared to the conventional, hydrothermally prepared MCM-48 material. To cite this article: M.

Effects of Microwave and Ultrasonic-Assisted Aging on the Synthesis of H-ZSM-5 Nanozeolite and Its Catalytic Performance in Methanol Dehydration

“…Use of microwave radiation in the synthesis of zeolites offers advantages over conventional methods, including a higher heating rate in a shorter time, which is due to its volumetric heating [14][15][16]. Rapid heating and a better heat transfer using this technique result in rapid dissolution of gel and simultaneous abundant nucleation in the synthesis mixture and a high crystallization rate is obtained [17,18].…”

Adsorption properties of ordered mesoporous silicas synthesized in the presence of block copolymer Pluronic F127 under microwave irradiation

“…An alternative to this approach is the microwave-assisted synthesis, which not only affords good quality OMSs but also is energy and time efficient as well as environmentally friendly (Newalkar et al 2000;Komarneni 2001, 2002;Fantini et al 2004;Hwang et al 2004;Bandyopadhyay and Gies 2005;Park et al 2004;Tompsett et al 2006;Celer and Jaroniec 2006;Grabicka and Jaroniec 2009). It is important to mention that the synthesis temperature and pressure are easily programmable in modern microwave instruments, which facilitates screening of a wide range of conditions over relatively short time.…”

“…Microwave-assisted synthesis offers many benefits over conventional method and was successfully used for the preparation of various OMSs such as MCM-41 (Wu and Bein 1996;Bandyopadhyay and Gies 2005), MCM-48 (Wu and Bein 1996;Bandyopadhyay and Gies 2005), SBA-15 (Newalkar et al 2000;Komarneni 2001, 2002), SBA-16 ), FDU-1 (Fantini et al 2004) and related mesoporous materials (Tompsett et al 2006). This method has been used for the synthesis of surfactant-templated OMSs such as MCM-41 and MCM-48 and block-copolymer-templated OMSs such as SBA-15, SBA-16 and FDU-1.…”

Stability and characterization of mesoporous molecular sieve using natural clay as a raw material obtained by microwave irradiation

“…For example, Zhou et al [14] synthesized mesoporous molecular sieve with high stability and Brönsted acid site by using natural clay, ethyl orthosilicate and aluminum isopropoxide as raw materials at room temperature, yet the raw material aluminum isopropoxide used in the synthesis is not only high cost but also high toxicity; Jiang et al [15] synthesized mesoporous molecular sieve with high thermal and hydrothermal stabilities by hydrothermal method using natural clay, sodium silicate as raw materials and cetyl trimethyl ammonium bromide as a template under alkaline condition, but hydrothermal method wasted both energy sources and time. At present, microwave irradiation technique is widely applied to the synthesis of mesoporous molecular sieve [16][17][18][19][20] heated system with uniform temperature, selective heating, without hysteresis effect and short crystallization time, but most investigations aimed at the synthesis of mesoporous molecular sieve. However, study on thermal and hydrothermal stabilities of mesoporous molecular sieve synthesized under microwave irradiation was seldom reported.…”