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A TiO2/C catalyst having biomimetic channels and extremely low Pt loading for formaldehyde oxidation.
Liu, Wei; Gong, Yutao; Li, Xueping; Luo, Cai-Wu; Liu, Congmin; Chao, Zi-Sheng.
Affiliation
  • Liu W; State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha 410082 China zschao@yahoo.com.
  • Gong Y; School of Chemical & Biomolecular Engineering and RBI, Georgia Institute of Technology 500 10th Street N.W. Atlanta GA 30332 USA.
  • Li X; School of Chemical & Biomolecular Engineering and RBI, Georgia Institute of Technology 500 10th Street N.W. Atlanta GA 30332 USA.
  • Luo CW; State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha 410082 China zschao@yahoo.com.
  • Liu C; State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha 410082 China zschao@yahoo.com.
  • Chao ZS; National Institute of Clean-and-Low-Carbon Energy Beijing 102211 China.
RSC Adv ; 9(7): 3965-3971, 2019 Jan 25.
Article in En | MEDLINE | ID: mdl-35518097
ABSTRACT
This study presents a TiO2/C hybrid material with biomimetic channels fabricated using a wood template. Repeated impregnations of pretreated wood chips in a Ti precursor were conducted, followed by calcination at 400-600 °C for 4 hours under a nitrogen atmosphere. The generated TiO2 nanocrystals were homogenously distributed inside a porous carbon framework. With an extremely low Pt catalyst loading (0.04-0.1 wt%), the obtained porous catalyst could effectively oxidize formaldehyde to CO2 and H2O even under room temperature (conv. ∼100%). Wood acted as both a structural template and reduction agent for Pt catalyst generation in sintering. Therefore, no post H2 reduction treatment for catalyst activation was required. The hierarchal channel structures, including 2-10 nm mesopores and 20 µm diameter channels, could be controlled by calcination temperature and atmosphere, which was confirmed by SEM and BET characterizations. Based on the abundant availability of wood templates and reduced cost for low Pt loading, this preparation method shows great potential for large-scale applications.