Preparation of Nanoporous Ruthenium Catalyst and Its CO Oxidation Characteristics

Abstract

Anodic polarization measurements for various ruthenium (Ru) alloys revealed that hexagonal close-packed nanoporous Ru (np-Ru) can be fabricated by dealloying or selective dissolution of manganese (Mn) from RuMn alloy. The pore size and specific surface area of fabricated npRu were 3 nm and 51.5 m 2 g ¹1 , respectively. An electron diffraction pattern suggested a polycrystalline nature of the fabricated np-Ru, which is perhaps due to the change in the crystal structure during dealloying. The oxidation of carbon monoxide (CO) was efficiently catalyzed by the npRu. The activation energy was 82 kJ mol ¹1 which is comparable to that of the polycrystalline RuO 2 /Ru catalyst. The present np-Ru is a novel candidate as a recoverable Ru catalyst.

Nanoporous Metals as Novel Catalysts for Chemical Transformations☆

“…Hakamada et al 16 SO 4 , which resulted in the evolution of nanoporosity with pore size of $3 nm. Generally, the crystallite size of the metal should be larger than the pore or the ligament size to calculate the porosity (as in AuNPore).…”

Examination of Salicylaldehyde as a Surface Modifier of Manganese for Application in Chemical Mechanical Planarization

“…7 This chemical function of Mn in the context of CMP is also expected in view of the commonly known preferential activity of Mn in its various alloys. [60][61][62] Thus controlling the Mn-specific electrochemistry of Mn based barrier films is an essential factor for designing CMP slurries of these materials. The CMP strategy explored in the present work focuses on the formation (and subsequent removal) of Mn-hydroxide surface species and their complexes with Sal − .…”

Hierarchical nanoporous metals as a path toward the ultimate three-dimensional functionality

“…Using various dealloying techniques, many novel nanoporous metals have been produced. Thus, nanoporous Ag [ 11 ], Pt [ 12,13 ], Pd [ 14 ], Ir [ 15 ], Ni [ 16–18 ], Cu [ 19,20 ], Ti [ 21 ], Ru [ 22 ], and Au alloy [ 23 ] were fabricated by dealloying AgAl, PtAl, PdCo, IrMg, NiMn, CuMn, TiSc, and RuMn alloys and multicomponent metallic glasses, respectively. Among these materials, NPG represents the most widely studied prototype of dealloyed nanoporous metals and one of the nanomaterials which can be easily fabricated in the chemical laboratory of a junior high school.…”