Liu Wei, Gong Yutao, Li Xueping, Luo Cai-Wu, Liu Congmin, Chao Zi-Sheng
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha 410082 China
School of Chemical & Biomolecular Engineering and RBI, Georgia Institute of Technology 500 10th Street N.W. Atlanta GA 30332 USA.
RSC Adv. 2019 Jan 29;9(7):3965-3971. doi: 10.1039/c8ra10314c. eCollection 2019 Jan 25.
This study presents a TiO/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 TiO 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 CO and HO 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 H 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.
本研究展示了一种使用木材模板制备的具有仿生通道的TiO/C杂化材料。将预处理后的木屑反复浸渍在钛前驱体中，然后在氮气气氛下于400 - 600°C煅烧4小时。生成的TiO纳米晶体均匀分布在多孔碳骨架内。在极低的Pt催化剂负载量（0.04 - 0.1 wt%）下，所制备的多孔催化剂即使在室温下也能有效地将甲醛氧化为CO和H₂O（转化率约为100%）。木材在烧结过程中既作为结构模板又作为Pt催化剂生成的还原剂。因此，无需进行后H还原处理来活化催化剂。通过SEM和BET表征证实，包括2 - 10 nm中孔和20 μm直径通道的分级通道结构可通过煅烧温度和气氛进行控制。基于木材模板的丰富可得性以及低Pt负载带来的成本降低，这种制备方法在大规模应用方面显示出巨大潜力。
