Nondeactivating Nanosized Ionic Catalysts for Water−Gas Shift Reaction

The water−gas shift reaction (WGS) is an important reaction to produce hydrogen. In this study, we have synthesized nanosized catalysts where Pt ion is substituted in the +2 state in TiO 2, CeO 2, and Ce 1− x Ti x O 2−δ . These catalysts have been characterized by X-ray diffraction and X-ray photoelectron spectroscopy (XPS), and it has been shown that Pt 2+ in these reducible oxides result in solid solutions like Ti 0.99 Pt 0.01 O 2−δ, Ce 0.83 Ti 0.15 Pt 0.02 O 2−δ, and Ce 0.98 Pt 0.02 O 2−δ . These catalysts were tested for the water gas shift reaction both in the presence and absence of hydrogen. It was shown that Ti 0.99 Pt 0.01 O 2−δ exhibited higher catalytic activity than Ce 0.83 Ti 0.15 Pt 0.02 O 2−δ and Ce 0.98 Pt 0.02 O 2−δ . Further, experiments were conducted to determine the deactivation of these catalysts. There was no sintering of Pt and no carbonate formation; therefore, the catalyst did not deactivate even after prolonged reaction. There was no carbonate formation because of the highly acidic nature of Ti 4+ ions in the catalysts.