A5087430733- Zeolite Catalysis and Synthesis
- Catalysis and Hydrodesulfurization Studies
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Chemical Synthesis and Reactions
- Mesoporous Materials and Catalysis
- Magnesium Oxide Properties and Applications
- Layered Double Hydroxides Synthesis and Applications
- Chemical Synthesis and Characterization
- Catalysis for Biomass Conversion
- Polyoxometalates: Synthesis and Applications
- Crystallization and Solubility Studies
- Biodiesel Production and Applications
- Oxidative Organic Chemistry Reactions
- Thermal and Kinetic Analysis
- Industrial Gas Emission Control
- Inorganic Fluorides and Related Compounds
- Petroleum Processing and Analysis
- Inorganic and Organometallic Chemistry
- Asymmetric Hydrogenation and Catalysis
- Thermal Expansion and Ionic Conductivity
- Chemical Looping and Thermochemical Processes
- Catalysts for Methane Reforming
- Lubricants and Their Additives
- Advanced Chemical Physics Studies
Hokkaido University of Education
2013-2025
Hakodate University
2022
Kansas State University
1987-1997
Hokkaido University
1981-1988
A highly active solid superacid of sulfated tin oxide was prepared from gel, which precipitated by the hydrolysis SnCl4 and washed with aqueous ammonium acetate solution, followed exposure to sulfuric acid calcining. Differencial thermal analysis suggested that ion remaining on surface replaced sulfate ion. The strength estimated temperature-programmed desorption using argon higher than zirconia, a well-known superacid, activation energy Ar former being 10.6 kJ mol-1 in comparison 9.3...
Ensuring the safety of researchers by protecting them from exposure to toxic gases in laboratories is paramount importance. This study investigated effectiveness using high-surface-area MgO remove HCl under atmospheric conditions. Two types were synthesized through thermal decomposition 1-1-1, Tennodai, Tsukuba, Mg(OH)2 and MgC2O4·2 H2O. diluted with air passed both samples, amounts removed morphological changes samples compared. No significant differences surface area or crystallinity...
The generation of superbase sites by doped alkali metals (Li, Na, and K) on alkaline earth metal oxides (MgO, CaO, SrO, BaO) has been examined. In catalytic activity for the double bond migration 4,4-dimethyl-1-pentene 2,3-dimethyl-1-butene, a large increase in was observed with Na- K-doped MgO, owing to an electron, or paired electrons, being trapped. base-catalytic very small other materials. spin concentration NO22- radicals, formed selective adsorption NO strong base sites, determined...
The relative acid strength of sulfated SnO2, ZrO2, silica−alumina, H−Y, H−ZSM-5, and H-mordenite was estimated by the heat Ar adsorption, calculated from a temperature dependence amount adsorption around room temperature. These were 23.5, 23.6, 13.8−16.5 kJ mol-1 for H-type zeolites, respectively. data indicate that is suitable probe molecule sites on solid surface this technique useful evaluation superacids.
Sulfated zirconia (ZrS) has been widely used as an acid catalyst in industrial processes for the isomerization of n-alkanes. Despite excellent catalytic properties this material, its catalytically active structure hardly identified to date. In study, we investigated crystal and crystalline Zr3SO9, which was reported 30 years ago by Kato et al. Zr3SO9 a hexagonal-shaped plate consisting (101) plane tetragonal ZrO2 phase with S species uniformly dispersed form SO42–. exhibits outstanding...
Abstract Solid superacids of sulfated zirconia were prepared by the sulfation gels, which obtained from mother solutions with different pH values. The gel precipitated at = 8 gave zirconia, showed highest catalytic activity and selectivity for skeletal isomerization n-pentane. active superacid was high reproducibility upon heating solution, followed washing precipitate hot water; this preparation procedure provided oxide small particle size. could be estimated exothermal peak caused...
Abstract A highly active solid superacid of sulfated tin oxide was prepared from gel which precipitated SnCl4 solution and washed with aqueous ammonium acetate solution. The showed activity much higher than the zirconia, a well known superacid, for skeletal isomerization n-pentane, its acid strength estimated by temperature-programmed desorption using argon also that latter.
The relative acid strength and the number of sites solid acids exhibiting high surface acidity have been determined from argon adsorption isotherms using Langmuir's equation in temperature range T = 203–243 K Henry's 233–313 K. heat Ar was −14.9, −15.6, −17.9, −17.7, −17.1, −26.3, −29.6, −21.4, −21.6 kJ mol−1 for silica–alumina, H–Y, H–ZSM–5, H–-MOR, H–Beta zeolites, sulfated ZrO2, SnO2, tungstated Pt-loaded respectively. corresponding values saturated amount were 0.35, 0.37, 1.44, 0.10,...
Abstract A solid superacid catalyst with an acid strength of Ho≤−16.04 was synthesized from tin hydroxide, which obtained the solution pH=10, by exposing to 3 mol·1−1 H2SO4 followed calcination in air at 823 K; active for skeletal isomerization butane isobutane room temperature.