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Synthesis and Characterization of Titania Nanomaterials for Support of Gold Catalyst

Author: WuYu
Tutor: XuBaiQing
School: Tsinghua University
Course: Chemistry
Keywords: Au/TiO2 One-dimensional dioxide The catalyst storage with protection CO oxidation Selective hydrogenation
CLC: O643.36
Type: PhD thesis
Year: 2008
Downloads: 461
Quote: 0
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Abstract


Supported nano-Au catalyst is a hotspot in the field direction of heterogeneous metal catalysis in the past 20 years, Au / TiO 2 is a typical representative. However different morphology TiO 2 , in particular, one-dimensional (1D) TiO 2 act as nano-Au catalyst carrier whether conferred Au / TiO 2 excellent catalysis effect is still rarely reported. On the other hand, Au / TiO 2 inactivation during storage has become the main factors that hinder its application. In this paper, to achieve controlled morphology the synthesized TiO 2 based on Au / TiO 2 catalyst structure and performance. Explore the work of the Au / TiO 2 storage stability at room temperature is found not restore of Au3 and adsorbed H2O has a great influence on the stability of the catalyst for the first time, pursuant to which the development of a store at room temperature Au / TiO 2 catalyst. The the TiCl4-acetone mixture synthesized TiO 2 nanocrystals new method. In the the TiCl4 / acetone molar ratio (TiCl4/Ac) is not greater than 1/15, can choose changing TiCl4/Ac and reaction temperature synthesis of anatase TiO 2 (TiO 2 -A) nano-particles, and in regulating the size range of 4-10 nm; generated the rutile TiO 2 nanofibers in TiCl4/Ac ≥ 1/10,. The formation of TiO 2 nanocrystals possible mechanism. Ethanol - water mixture instead of water, powder TiO 2 titanate nanotubes improve both the lye water heat treatment, titanate nanowires and nanotubes Controllable synthesis. The the prepared TiO 400oC calcined respectively 2 (B) nanowires (NW-TiO 2 (B)) and TiO 2 -A nanometer rods (NR-TiO 2 -A). Deposition - precipitation was prepared the series Au/1D-TiO 2 catalyst, the catalytic performance of the CO oxidation and 1,3 - butadiene hydrogenation reaction. 2 -A catalytic activity for CO oxidation reaction, Au / NR-TiO is Au/P25-TiO 2 1.6 times, is Au / TiO 2 < / sub>-A 4 times the Au / NW-TiO 2 (B) of 8 times. For the 1,3 - butadiene selective hydrogenation reaction, the Au / NW-TiO 2 (B) and Au/P25-TiO 2 showed considerable catalytic activity, But of Au / NR-TiO 2 -A, the catalytic activity is less than 1/3. That 1D-TiO 2 is a the Au catalyst support, great development potential for the development of high-performance Au / TiO , 2 catalyst is expected to create opportunities. To improve the storage stability of the Au / TiO 2 catalyst prepared the Au3 proportion and to suck the different Au/P25-TiO H2O amount 2 catalyst. Au / TiO 2 Au3 share of the sample the higher the proportion of adsorbed the H2O amount of lower, its storage stability at room temperature, the higher. The The Au3 proportion of 100% and a suction the low Au/P25-TiO H2O amount 2 catalyst, it is stored at room temperature for 150 days the catalytic activity is still considerable with the fresh catalyst is prepared on this basis. These results suggest that the in Au3 state and to prevent catalyst sucked H2O is the key to prevent the Au / TiO 2 storage inactivation keeping Au species.

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