1. Microwave-assisted fast vapor-phase transport synthesis of MnAPO-5 molecular sieves
- Author
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Shao, Hui, Yao, Jianfeng, Ke, Xuebin, Zhang, Lixiong, and Xu, Nanping
- Subjects
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MOLECULAR sieves , *X-ray diffraction , *FOURIER transform infrared spectroscopy , *SCANNING electron microscopy , *INORGANIC compounds , *ESTERIFICATION , *PHOSPHORIC acid , *MICROWAVE heating - Abstract
Abstract: MnAPO-5 was prepared by a microwave-assisted vapor-phase transport method at 180°C in short times. The products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectra, UV–vis spectroscopic measurement, NH3-temperature-programmed desorption and esterification reaction. It was found that dry gels prepared with aluminum isopropoxide, phosphoric acid and manganese acetate could be transferred to MnAPO-5 in the vapors of triethylamine and water by the microwave-assisted vapor-phase transport method at 180°C for less than 30min. The crystallization time was greatly reduced by the microwave heating compared with the conventional heating. The resulting MnAPO-5 exhibited much smaller particle sizes, higher surface areas and slightly higher catalytic activity in the esterification of acetic acid and butyl alcohol than those prepared by the conventional vapor-phase transport method and hydrothermal synthesis. [Copyright &y& Elsevier]
- Published
- 2009
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