Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India.
Phys Chem Chem Phys. 2011 Jan 14;13(2):708-18. doi: 10.1039/c0cp01110j. Epub 2010 Nov 8.
A catalytic hydrogen combustion reaction was carried out over noble metal catalysts substituted in ZrO(2) and TiO(2) in ionic form. The catalysts were synthesized by the solution combustion technique. The compounds showed high activity and CO tolerance for the reaction. The activity of Pd and Pt ion substituted TiO(2) was comparable and was higher than Pd and Pt ion substituted ZrO(2). The mechanisms of the reaction over the two supports were proposed by making use of the X-ray photoelectron spectroscopy and FT infrared spectroscopic observations. The reaction over ZrO(2) supported catalysts was proposed to take place by the utilization of the surface hydroxyl groups while the reaction over TiO(2) supported catalysts was hypothesized to be a hybrid mechanism utilizing surface hydroxyl groups and the lattice oxygen.
在离子形式的 ZrO(2) 和 TiO(2) 中取代的贵金属催化剂上进行了催化氢燃烧反应。催化剂通过溶液燃烧技术合成。这些化合物表现出对反应的高活性和 CO 耐受性。Pd 和 Pt 离子取代的 TiO(2) 的活性相当，且高于 Pd 和 Pt 离子取代的 ZrO(2)。通过 X 射线光电子能谱和傅里叶变换红外光谱观察，提出了两种载体上反应的机理。ZrO(2)负载催化剂上的反应被认为是通过利用表面羟基进行的，而 TiO(2)负载催化剂上的反应则被假设为利用表面羟基和晶格氧的混合机制。
