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The effect of calcination atmosphere upon the photocatalytic performance of Au-La2O3/TiO2 for hydrogen production from formic acid
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-24 , DOI: 10.1016/j.apcata.2017.08.027
Minghui Wu , Meng Zhang , Tao Lv , Minxue Guo , Jianjun Li , Chika A. Okonkwo , Qing Liu , Lishan Jia

A simple modified sol-gel method by calcinating titanium dioxide precursor with gold and lanthanum in heat treatment under H2/CO2 atmosphere has been proposed to prepare highly photocatalytic Au-La2O3/TiO2 (ALT) hybrid. Characterization results show that gold nanoparticles with small particle size are embedded in a nearly homogeneous component, which may induce a strong interaction of La and Au co-doping to obtain an appropriately modified bandgap structure and extend the absorption edge to visible light region. The formation of La2O2CO3 on the surface could facilitate to the basicity optimization of the photocatalyst and contribute to the CH bond cleavage in HCOO- to release H2 and CO2 from formic acid (FA). The large surface area and small-sized mesopores structure could provide more active sites for the adsorption of reactant molecules and improve the photocatalytic activity. Benefiting from these positive effects, the ALT photocatalyst calcinating in H2/CO2 demonstrated a great potential in FA photocatalytic decomposition under simulated sunlight irradiation and produced an optimal H2 generation rate of 178.4 μmol gcat1 h−1 (14.9 mmol gAu1 h−1), which was approximately 1.3, 1.9 and 2.6 times higher than the same catalysts calcinating in H2, CO2, and N2, respectively.



中文翻译:

煅烧气氛对Au-La 2 O 3 / TiO 2光催化甲酸制氢性能的影响

提出了一种简单的改进的溶胶-凝胶法,该方法通过在H 2 / CO 2气氛下进行热处理将金和镧煅烧二氧化钛前驱体,以制备高度光催化的Au-La 2 O 3 / TiO 2(ALT)杂化物。表征结果表明,具有较小粒径的金纳米粒子被嵌入几乎均一的组分中,这可能会引起La和Au共掺杂的强烈相互作用,从而获得适当修饰的带隙结构,并将吸收边缘扩展到可见光区域。La 2 O 2 CO 3的形成表面上的碳原子可以促进光催化剂的碱性优化,并有助于在HCOO-中裂解C H键,从而从甲酸(FA)中释放H 2和CO 2。大表面积和小尺寸的中孔结构可为反应物分子的吸附提供更多的活性位点,并提高光催化活性。得益于这些积极作用,在H 2 / CO 2中煅烧的ALT光催化剂在模拟阳光照射下显示出FA光催化分解的巨大潜力,并产生了178.4μmol的最佳H 2生成速率。 GC一个Ť-1个 h -1(14.9 mmol G一个ü-1个 h -1),分别比在H 2,CO 2和N 2中煅烧的相同催化剂高约1.3倍,1.9倍和2.6倍。

更新日期:2017-08-24
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