Co Hydrogenation Over an Amorphous Gold-Zirconium Alloy

Abstract

An amorphous Au25Zr75 alloy showed a high catalytic activity for hydrogenation of carbon monoxide. Thus, the rate of methanation was 2.3 μmol s−1 g−1 under 6.0 MPa at 523 K, being much higher than that over Au/ZrO2 or ZrO2. It was found that the alloy was oxidized into metallic gold and ZrO2 under the reaction conditions.

Neutron powder diffraction study of the crystal structures of ZrAu

“…Indeed, chemical routes, commonly used for the preparation of Au/ZrO 2 catalysts, are limited to low concentrations of noble metal because the required processing temperature induces particle growth. The same restriction holds for the oxidation of glassy Zr-Pd [5,6], Zr-Au [7] and Zr-Au-Ag [8] alloys above 300 • C which has been shown to yield high surface catalysts.…”

Oxidation behavior of amorphous and nanoquasicrystalline Zr–Pd and Zr–Pt alloys

“…Very few investigations have so far been reported on oxidation of these alloys. Some recent works [4][5][6][7] have reported high sensitivity of some of these alloys to oxidation. Among the entire easy forming amorphous systems, Zr-based alloy systems are quite well known [3].…”

Heat capacity of the AuZr compound obtained by high-temperature drop calorimetry

“…the recent interest of hydrogen absorption properties of the intermetallic compounds in the ZreAu system [1], and the use of ZreAu alloys as catalysts. Indeed, the oxidation of glassy ZreAu [2] and ZreAueAg [3] alloys has been shown to result in high surface catalysts for CO hydrogenation and oxidation. Recently, we have shown that a mixture of both gold and zirconia nanoparticles (Au/ZrO 2 catalysts) can be prepared by low-temperature (T < 100 C) oxidation of crystalline ZreAu alloys [4e6].…”