A5031508632- Ammonia Synthesis and Nitrogen Reduction
- Nanomaterials for catalytic reactions
- Catalytic Processes in Materials Science
- Hydrogen Storage and Materials
- Nanopore and Nanochannel Transport Studies
- Advanced Photocatalysis Techniques
- Carbon Nanotubes in Composites
- Catalysis and Hydrodesulfurization Studies
- Biodiesel Production and Applications
- Graphene research and applications
- Catalysis for Biomass Conversion
- Gas Sensing Nanomaterials and Sensors
- Glass properties and applications
- Advanced battery technologies research
- Biofuel production and bioconversion
- Electrocatalysts for Energy Conversion
- Mesoporous Materials and Catalysis
- Luminescence Properties of Advanced Materials
- Membrane-based Ion Separation Techniques
- Supercapacitor Materials and Fabrication
- Transition Metal Oxide Nanomaterials
- Covalent Organic Framework Applications
- Ion-surface interactions and analysis
- ZnO doping and properties
National Institute of Advanced Industrial Science and Technology
2017-2024
Department of Energy and Environment
2019-2020
Frontier Energy (United States)
2019
Okayama University
2013-2018
Okayama University of Science
2011
Aoyama Gakuin University
2006
The potential of Ru/CeO2 catalysts to catalyze the synthesis ammonia from renewable hydrogen was explored under ambient and high-pressure conditions. Different types Ru precursors, CeO2, their combinations strongly influenced NH3 activity. catalytic activities Ru(acac)3 Ru(NO)(NO3)3 were relatively high at pressure. activity 1 wt% with as a precursor studied dependence on temperature, pressure, space velocity, H2/N2 ratio investigated. parameter dependences differed somewhat between...
Abstract A mesoporous carbon‐supported Ru catalyst with Cs promotor and an open mesostructure (Cs−Ru/MPC) was prepared by a stepwise wet impregnation method used for sustainable ammonia synthesis under mild reaction conditions using wide range of space velocities (SV). The Cs−Ru/MPC showed higher activity stability than reference microporous framework the same (an active‐carbon‐supported Cs‐promoted (Cs−Ru/AC)). It found that carbon is suitable medium dispersion nanoparticles within narrow...
The co-processing of an unconventional type Jatropha bio-oil with petroleum distillates over mesoporous alumina-supported CoMo and NiMo sulfide catalysts (denoted CoMo/γ-Al2O3 NiMo/γ-Al2O3) was studied. Either a stainless-steel high-pressure batch-type reactor or up-flow fixed-bed reaction system used under severe conditions (330–350 °C 5–7 MPa), similar to the conventional diesel hydrodesulfurization (HDS) process. To understand catalytic performance for co-processing, we prepared two...
A series of novel mesoporous carbon-supported, Ba-promoted, Ru catalysts with Ba/Ru ratios 0.1–1.6 and a loading 10 wt% (denoted as 0.1–1.6Ba-10Ru/MPC) were prepared via stepwise impregnation Ba precursors on the carbon materials. The applied to mild ammonia synthesis compared reference materials, including an analog catalyst ratio 1.6 1.6Ba-10Ru/AC). Characterization by X-ray diffraction (XRD), nitrogen physisorption, electronic microscopy revealed that 0.1–1.6Ba-10Ru/MPC contained...
The Cs-promoted Ru nanocatalysts supported on mesoporous carbon materials (denoted as Cs-Ru/MPC) and microporous activated Cs-Ru/AC) were prepared for the sustainable synthesis of ammonia under mild reaction conditions (<500 °C, 1 MPa). Both Cs species homogeneously impregnated into mesostructures three commercial available annealed at 1500, 1800 2100 °C (termed MPC-15, MPC-18 MPC-21, respectively), resulting in a series Cs-Ru/MPC catalysts with loadings 2.5–10 wt % fixed loading 33 %,...
The structures and properties of hydrated ions confined in solid nanospaces are not substantially understood, although they indispensable for the development new devices such as electrical double-layer capacitors. We describe hydration structure around a Zn2+ restricted slit-shaped micropores two kinds activated carbon fibers (ACF) by analysis X-ray absorption fine (XAFS) spectra. proportion dissolved species against total adsorbed amounts Zn2+on ACF was decreased with reduction average...
Direct incorporation of a Pt(II) complex into the shell SWCNT/fullerodendron coaxial nanohybrids produces new nanowire, SWCNT/fullerodendron/Pt(II), that shows efficient photocatalytic activity for hydrogen evolution from water (Φ = 0.16 upon irradiation at 450 ± 5 nm) without any aid electron relay such as methyl viologen.
An active and durable Ru-based catalyst using an inert support such as SBA-15 for low pressure ammonia synthesis can be prepared, where the Cs-promoted Ru sites are delicately built in nanospace.
The structure of hydrated Co ions confined in the nanospace single-walled carbon nanotubes (SWNTs) has been studied using X-ray absorption fine (XAFS) technique. Water adsorption isotherms on Co-impregnated SWNTs indicate a high affinity to water molecules. results XAFS analysis provided information proportion dissolved species nanospaces against total amount cobalt adsorbed open-pored SWNT. structural first shell around ion was expressed terms hydration number, Co–O distance and...
The active sites of Ba- and Cs-promoted Ru/mesoporous carbons were examined by advanced techniques, especially X-ray absorption spectroscopy, correlated to their activities in long-term ammonia synthesis under intermittent operation conditions.
The bio-oil was largely produced by thermal pyrolysis of Jatropha-derived biomass wastes (denoted as Jatropha bio-oil) using a pilot plant with capacity 20 kg h-1 at Thailand Institute Scientific and Technological Research (TISTR), Thailand. is an unconventional type bio-oil, which mostly composed fatty acids, acid methyl esters, amides, derivatives, consequently, it contains large amounts heteroatoms (oxygen ~20 wt.%, nitrogen ~ 5 sulfur 1000 ppm.). heteroatoms, especially nitrogen, are...
We shed light on the specific hydration structure around a zinc ion of nanosolution restricted in cylindrical micropore single-wall carbon nanotube (SWNT) by comparison with mesopore multi-wall (MWNT) and that bulk aqueous solution. The average width open-pore SWNT was 0.87 nm which is equivalent to size hydrated having 6-hydrated water molecules. could impregnate ions into negligible amounts ion-exchanged species surface functional groups appropriate oxidation followed heat treatment under...
Thus far, nobody has successfully obtained the accurate information on properties of adsorbed phases gases or vapors formed inside a cylindrical micropore single-walled carbon nanotube (SWCNT) itself based experimental procedure. In this work, we succeeded in analyzing experimentally nitrogen and water confined inner pore SWCNT by opening composed close-ended without any changes surface state also applying unique method for characterization; both amounts, as well properties, functional...
To improve the oxidative stability of biodiesel fuel (BDF), polyunsaturated fatty acid methyl esters (poly-FAME) presented in commercial palm oil-derived (palm-BDF) were selectively hydrogenated to monounsaturated (mono-FAME) under a mild condition (80 °C, 0.5 MPa) using activated carbon (AC)-supported Pd catalysts with loading 1 wt.%. The partially hydrotreated palm-BDF (denoted as H-FAME) which has low poly-FAME components is new type BDF enhanced quality for use high blends. In this...
Carbon-supported ruthenium catalysts facilitate electrically-assisted Haber–Bosch ammonia synthesis. However, the relationship between carbon supports and catalytic performance remains ambiguous. We developed ordered mesoporous plates (MCPs) with varying graphitization degrees as Cs-promoted Ru catalyst supports, examining correlations synthesis rate key structural parameters, included degree, nanoparticle size, Cs/Ru ratio. High-graphitization-degree resisted methanation facilitated...
Phosphate glasses dissociating hydrogen from water vapor were prepared and their performance was evaluated. Glasses with compositions of 30Na2O–10BaO–30P2O5–(30–x)Nb2O5–xWO3 (5<x<25) dissociated into oxygen around 500 8C. The best dissociation observed on a specimen the tungsten composition x = 15. result suggests that coexistence Nb2O5 WO3 is important in obtaining high dissociation. When replaced by other transition metal oxides such as MoO3, amount decreased one-third.
The bio-oil was largely produced by thermal pyrolysis of Jatropha-derived biomass wastes (denoted as Jatropha bio-oil) using a Pilot Plant with capacity 20 kg h-1 at Thailand Institute Scientific and Technological Research (TISTR), Thailand. is an unconventional type bio-oil, which mostly composed fatty acids, acid methyl esters, amides derivatives, consequently it contained large amounts heteroatoms (oxygen ~ wt.%, nitrogen 5 sulfur 1000 ppm.). heteroatoms, especially, are highly poisonous...