Microwave synthesis of high-flux NaY zeolite …

T1 - Microwave synthesis, characterization, bioactivity and in vitro biocompatibility of zeolite-hydroxyapatite (Zeo-HA) composite for bone tissue engineering applications

Microwave synthesis of zeolite membranes: A review

Microwave-assisted zeolite synthesis from coal fly ash …

Microwave Synthesis of Zeolites: 1

AB - A statistical technique for optimizing zeolite Na-A synthesis as a function of percent yield was investigated. A two-step hydrothermal treatment method assisted by microwave heating was applied on the extracted ion solution for zeolites synthesis. The optimization sequence included the application of an experimental design and the results obtained were fitted to a second order model. The resultant predicted data were used in creation of an optimal set of conditions. Box-Behnken design of response surface methodology of three factors with three levels was applied. The three factors which have been adopted were NaOH concentration (2, 4 and 6 M), microwave power level (10, 55 and 100 % of 800 W) and time of exposure to the irradiation (1, 3.5 and 6 min). With the application of the above experimental design three solid products, Na-A zeolite, sodalite octahydrate and gibbsite were formed. The three products were characterized by their X-ray diffraction images. It was found that the percent yield of Na-A zeolite would be optimized when the extracted Si ion concentration in the response optimizer was higher than 2,000 ppm and the base used in the extraction not more than 4 M. The optimum conditions to maximize the percent yield of zeolite Na-A were 3.8 M of NaOH, 2.5 min of time and 48.2 % W of microwave power level.

09/07/2004 · Microwave Synthesis of Zeolites: 1

N2 - A statistical technique for optimizing zeolite Na-A synthesis as a function of percent yield was investigated. A two-step hydrothermal treatment method assisted by microwave heating was applied on the extracted ion solution for zeolites synthesis. The optimization sequence included the application of an experimental design and the results obtained were fitted to a second order model. The resultant predicted data were used in creation of an optimal set of conditions. Box-Behnken design of response surface methodology of three factors with three levels was applied. The three factors which have been adopted were NaOH concentration (2, 4 and 6 M), microwave power level (10, 55 and 100 % of 800 W) and time of exposure to the irradiation (1, 3.5 and 6 min). With the application of the above experimental design three solid products, Na-A zeolite, sodalite octahydrate and gibbsite were formed. The three products were characterized by their X-ray diffraction images. It was found that the percent yield of Na-A zeolite would be optimized when the extracted Si ion concentration in the response optimizer was higher than 2,000 ppm and the base used in the extraction not more than 4 M. The optimum conditions to maximize the percent yield of zeolite Na-A were 3.8 M of NaOH, 2.5 min of time and 48.2 % W of microwave power level.

In Situ SAXS/WAXS of Zeolite Microwave Synthesis: NaY, ..
Microwave Techniques in the Synthesis and Modification of Zeolite Catalysts.

Microwave irradiation technique for synthesis of zeolite …

The heart of the problem Group Conner is looking at revolves around the idea of zeolite formation. In the past synthesis was on the order hours, new technologies, however, have reduced that time to minutes. This web page was set up for people of all knowledge levels. The information presented her should help the novice get a handle of what this group and our research is all about at an introductory level, and also allow the seasoned zeolite or microwave researcher to learn in the greatest detial about our most cutting edge discoveries.

Rapid Synthesis of HZSM-5 Zeolite by Microwave Radiation - Microwave Radiation;Zeolite;HZSM-5;

13/07/2015 · Microwave synthesis of high-flux NaY ..

AB - In the present study, bioactive composites composed of hydroxyapatite (HA) and zeolite-Y were successfully synthesized by using a cost-effective microwave-assisted wet precipitation method. The phase purity, functional groups, surface topography, and elemental composition of the composite materials were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDX), respectively. The XRD, FTIR, and EDX results confirmed the presence of zeolite with HA, demonstrating the formation of zeolite-HA composites. FESEM findings revealed that the particles had spherical morphology. The in vitro bioactivity assay using simulated body fluid (SBF) showed that the silica-based materials had the ability to support and accelerate the formation of dense layer. The cell viability of normal human osteoblast (NHOst) cells on the composites was confirmed by using cytotoxicity assay. In addition, FESEM results affirmed that the material supported adhesion of NHOst cells on its surface. In conclusion, the nano-structured zeolite-HA composites developed in this study showed good bioactivity and in vitro cell compatibility, and, therefore, may be considered as a potential candidate for bone tissue engineering applications.

Microwave Synthesis of Zeolite Membranes a Review - Download as PDF File (.pdf), Text File (.txt) or read online.

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While microwave enhancement of chemical syntheses has been demonstrated for a broad variety of chemical reactions, there is no accepted universal mechanism. Is the enhancement due to more efficient heating, to overheating, to nonuniform heating, or to nonthermal effects? Analyses are complicated due to the often significant spatial and temporal temperature variations in microwave reactor systems, particularly within microwave ovens. To address this, we employ multiple fiber-optic temperature probes throughout a cylindrical reactor with a focus on zeolite synthesis solutions being the dielectric medium. First, we vary the modes of power delivery (pulsed versus continuous) to quantify differences in local temperatures within a reaction vessel with water being the dielectric medium. The temperature distribution at steady state in the center of the water increased by 10 °C in pulsed delivery mode compared to the temperature distribution obtained in continuous delivery mode at the same average power. Then, we measured the temperature distributions for several zeolite synthesis solutions (NaY, silicalite, and SAPO-11) and water under microwave heating to investigate the temperature variations within these dielectric media. These measured temperature variations were found to be significant, depending on the dielectric permittivities of the reaction medium and their changes with temperature. Temperature profiles also depend on the microwave delivery mode and reactor configuration, i.e., the microwave reactor engineering. NaY synthesis solution exhibited the smallest penetration