Kohsuke Mori

Treatment of a stoichiometric hydroxyapatite (HAP), Ca10(PO4)6(OH)2, with PdCl2(PhCN)2 gives a new type of palladium-grafted hydroxyapatite. Analysis by means of powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray (EDX), IR, and Pd K-edge X-ray absorption fine structure (XAFS) proves that a monomeric PdCl2 species is chemisorbed on the HAP surface, which is readily transformed into Pd nanoclusters with a narrow size distribution in the presence of alco

Achieving precise control of active species on solid surfaces is one of the most important goals in the development of highly functionalized heterogeneous catalysts. The treatment of hydroxyapatites with PdCl(2)(PhCN)(2) gives two new types of hydroxyapatite-bound Pd complexes. Using the stoichiometric hydroxyapatite, Ca(10)(PO(4))(6)(OH)(2), we found that monomeric PdCl(2) species can be grafted on its surface, which are easily transformed into Pd(0) particles with narrow size distribution in t

A basic resin bearing −N(CH3)2 functional groups within its macroreticular structure performed as an efficient organic support for the active Pd nanoparticles (NPs) responsible for the production of high-quality H2 via formic acid (HCOOH) decomposition at convenient temperature. Physicochemical characterization as well as the kinetic isotope effect (KIE) revealed that not only the formation of small Pd NPs but also cooperative action by the −N(CH3)2 groups within the resins play crucial roles in

Highly dispersed monometallic Ru nanoparticles can be successfully synthesized on TiO2 supports for effective hydrogen production from ammonia–borane (NH3·BH3; AB). The choice of support material and reduction methods were confirmed to significantly influence the size of the Ru nanoparticles, and smaller sizes of Ru nanoparticles with a mean diameter of 1.7 nm could be formed on a TiO2 support material by H2 reduction at 200 °C. The catalytic activity of the Ru nanoparticles can be significantly

The specific features of the photocatalytic reduction of CO2 with H2O on various types of active titanium oxide catalysts are reviewed. UV-light irradiation of the bulk TiO2 powders in the presence of CO2 and H2O at room temperature under heterogeneous gas-solid conditions produced CH4 as the major product, while the predominant formations of CH3OH as well as CH4 were observed on the highly dispersed titanium oxide moiety anchored on zeolites and mesoporous silica materials. The CH3OH formation

The hydrogenation of carbon dioxide (CO₂) to formic acid (FA; HCOOH), a renewable hydrogen storage material, is a promising means of realizing an economical CO₂-mediated hydrogen energy cycle. The development of reliable heterogeneous catalysts is an urgent yet challenging task associated with such systems, although precise catalytic site design protocols are still lacking. In the present study, we demonstrate that PdAg alloy nanoparticles (NPs) supported on TiO₂

High-entropy alloys (HEAs) have been intensively pursued as potentially advanced materials because of their exceptional properties. However, the facile fabrication of nanometer-sized HEAs over conventional catalyst supports remains challenging, and the design of rational synthetic protocols would permit the development of innovative catalysts with a wide range of potential compositions. Herein, we demonstrate that titanium dioxide (TiO₂) is a promising platform for the low-temperature

In order to achieve an economical CO2-mediated hydrogen energy cycle, the development of heterogeneous catalysts for CO2 hydrogenation to formic acid is an urgent and challenging task. In this study, a stable and well-defined single-site Ru catalyst on the surface of a layered double hydroxide (LDH) in a basic medium is proven to be efficient for selective hydrogenation of CO2 to formic acid under mild reaction conditions (2.0 MPa, 100 °C). The electron-donating ability of triads of basic hydrox

A hydroxyapatite-bound Ru complex could efficiently catalyze the aerobic oxidation of various primary amines to nitriles which were further hydrated to amides in the presence of water.

This review presents the progress in the design of single-site and nano-confined photocatalysts in porous materials for environmental remediation and solar fuel production.

Magnetic γ-Fe2O3 nanocrystallites dispersed in a hydroxyapatite matrix (HAP-γ-Fe2O3) have been synthesized for the first time as a new catalyst support. The cation-exchange ability of the external HAP surface enables an equimolar substitution of Ru for Ca to form a catalytically active center (RuHAP-γ-Fe2O3). Characterization by several spectroscopic methods demonstrated the formation of γ-Fe2O3 nanocrystallites within the HAP matrix having a mean diameter of 8.0 nm (σ = 18.4 Å, σ/d = 21.7%). Th

Plasmonic photocatalyst: Anchoring the dye [Ru(bpy)3]2+ (bpy=2,2′-bipyridine) on the surface of Ag nanoparticles coated with a thin SiO2 layer (see picture) afforded a photocatalyst whose phosphorescence emission and photoinduced oxidation activity in the selective liquid-phase oxidation of styrene are efficiently enhanced through interaction with the localized surface plasmon resonance of the core Ag nanoparticles.

A PdAg-based nanoparticle catalyst supported on the mesoporous silica material, SBA-15, modified with a weakly basic phenylamine functional group has been developed as a dual heterogeneous catalyst for the H₂ delivery and H₂ storage reactions mediated by formic acid and carbon dioxide.

Creation of a stable and well-defined active center on a solid surface is a promising protocol for designing more efficient hybrid-catalysts that bridge the gap between homogeneous and heterogeneous catalysis. Treatment of a hydroxyapatite-bound Ru complex (RuHAP) with an aqueous solution of AgX (X = SbF6-, TfO-) afforded a new type of cationic Ru phosphate complex, having potentially vacant coordination sites. These cationic RuHAPs exhibited Lewis acidity toward carbonyl and cyano groups, promo