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Preparation and Characterization of the Magnetic Nano-size Solid Acid Catalyst

Author: ChangZuo
Tutor: DuanXue
School: Beijing University of Chemical Technology
Course: Applied Chemistry
Keywords: Magnetic Nano Solid acid Catalyst
CLC: O643.3
Type: Master's thesis
Year: 2001
Downloads: 296
Quote: 2
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Abstract


The nanocatalysts difficult to recover the status quo, to the idea of ??the magnetic assembly synthesis of magnetic nano-solid acid catalyst and solid acid, and design a magnetic material for nuclear innovative structural model of the solid acid coated on its surface. According to this model, for the first time prepared a series of different types of magnetic nano-solid acid catalyst, and they conducted a comprehensive evaluation confirmed the feasibility of the model. By examining Fe 2 / the Fe 3 feed ratio and the concentration of NaOH preparation of nanoscale magnetic precursor - magnetic base body (Fe 3 O particle size 4 ) and magnetic filter out the preparation of Fe 3 O 4 optimal experimental conditions. Compare the different preparation of magnetic solid acid catalyst ZrO 2 / Fe 3 O 4 , and its impact on the performance of the catalyst, and by the acetic acid butyl esterification reaction, magnetic performance measurement, XRD, XPS, TEM, specific surface area measurements, elemental composition analysis and other testing methods were used to characterize the structure and performance of the catalyst. The results indicate that the series of catalysts having a smaller particle size, higher magnetic and esterification catalytic activity and the ease of recycling, longer service life, to achieve the desired purpose. Their catalytic activity is enhanced with increasing active ingredient ZrO 2 content, ZrO 2 crystallization temperature because Fe 3 O 4 the presence of enhanced, the shape of each component in the catalyst as the treatment temperature increased changed. Wherein up to 44% of the optimal catalytic activity of 96%, the recovery rate of use of magnetic catalyst used three times, the activity remained unchanged. Treated with concentrated sulfuric acid catalyst, get with higher Esterification SO 4 the 2 - -ZrO to 2 / Fe O 4 superacid catalyst, the highest catalytic activity of up to 66%, directly using magnetic catalyst separation. Seen from the characterization results, the solid superacid the formation of catalyst magnetic specific surface area appearances atomic electron binding energy, and each component forms a significant effect. Prepared using ultrasonic method, series magnetic Beijing] two University the master record dagger Dissertation nano-solid acid catalyst Zr (504) 2 / F e3O4 study different preparation methods, and the ratio of the magnetic properties of the catalyst, the catalytic activity of the particle size The influence of the other aspects of the filter out the conditions for optimal preparation of the catalyst. Finally, zr (504) 2/5102/Fe3o4 and Zr (504) through the multi-layer coating method 2/zroZ/Fe3o; type catalyst preparation method of the preliminary exploration. Keywords: magnetic, nano, solid acid catalyst recognized

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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