The purpose of this study is to respond a demand to develop the technology to increase the valuation of Naphtha by producing benzene and toluene from light naphtha. We have obtained a higher performance catalyst (Aromax® II Catalyst), which showed nine times the activity and the twice the lifetime by the treatment of halogen on Pt/L Zeolite. We achieved start-up of the commercial plant at Saudi Arabia in1999. After the achievement at Saudi Arabia, commercialization has been expanded to the US and Spain. More expansion is expected.

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The environmental performances of engine oils have been key issue recently. These include fuel economy, longer drain intervals and compatibility with emission control systems. For more than half a century, zinc dialkyldithiophosphate(ZDTP) has been an essential additive in engine oils. The authors studied deterioration mechanism of ZDTP and determined that the sulfur in ZDTP was hampering efforts to improve environmental performance of engine oils. They turned their attention to zinc alkylphosphate (ZP), in which oxygen is substituted for the sulfur in ZDTP. Newly developed ZP oils show excellent environmental performance that cannot be attained with traditional technologies.

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An important role of lattice oxygen species was studied by using a membrane reactor composed of Yttria-stabilized Zirconia as an oxygen permeable membrane and oxidation catalysts. Highly dispersed and stable supported metal catalysts were prepared starting from perovskite or periclase. Ni/SrTiO3 catalysts showed high and sustainable activity in the oxidative reforming of CH4. Ni/Mg(Al)O catalysts prepared from hydrotalcite precursors showed high and sustainable activity in the steam reforming of CH4. A doping of small amount of noble metals in the Ni/Mg(Al)O catalysts suppressed the catalyst deactivation by Ni oxidation during the DSS operation to produce hydrogen for PEFCs. Moreover, the noble metal-doped Ni/Mg(Al)O catalysts exhibited self-activation as well as self-regenerative activity in the DSS steam reforming of CH4. This self-regenerative activity is due to a reversible reduction-oxidation of Ni species on/in Mg(Ni,Al)O assisted by hydrogen spillover from noble metals.

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My study on the acidity and the shape-selectivity observed on zeolite catalysts will be reviewed in the presentation.

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The influence of citric acid (CA) addition on CoMo/Al2O3 post-treatment catalysts was studied for the thiophene hydrodesulfurization (HDS) activity. A series of CoMo/Al₂O₃ catalyst with various amount of molybdenum (up to 35 wt% Mo) and molar ratio of CA/Mo (0 - 4) was prepared. Catalysts were also prepared by a chemical vapor deposition (CVD) technique using Co(CO)₃NO as a precursor of Co and characterized by means of NO adsorption, Raman spectra, Mo K-edge EXAFS and XRF. The presence of citric acid increased the HDS activity of Mo/Al₂O₃ up to molar ratio CA/Mo = 1 and leveled off with the further addition. An outstanding result was shown on a series of post-treated CVD-Co-Mo/Al₂O₃ catalysts, the HDS activity was drastically enhanced by the presence of citric acid. It is suggested that the dispersion of MoS₂ particles and/or the degree of sulfidation was increased by the post-treatment using CA even at a high Mo loading. This was also supported by the enhancement of NO adsorption capacity on a post-treated MoS₂/Al₂O₃. The Mo–CA complex species were observed on a post-treatment method with CA.

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High activation of supported Ru catalyst for hydrodesulfurization (HDS) was examined. The HDS activity of Ru/SiO₂ catalyst was hardly changed by various pretreatments. However, uncalcined Ru/Al₂O₃ (UC-Ru/Al₂O₃) which was treated by temperature programmed sulfidation (TPS) using 3% H₂S/N₂, showed the highest activity among various treated Ru/Al₂O₃ catalysts. Furthermore, when Ru loading was more than 10 wt%, HDS activity of UC-Ru/Al₂O₃ catalyst treated by TPS using 3% H₂S/N₂ was higher than that of CoMo/Al₂O₃ HDS catalyst.

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Titania-supported molybdenum catalysts were prepared by sol-gel methods using Titanium isopropoxide (TIP) and ammonium heptamolybdate and hydrodesulfurization (HDS ) of dibenzothiophene was performed. When titania was prepared from TIP and a catalyst was prepared using an impregnation method, the activity was very low. When tartaric acid was used to prepare titania, however, the activity of the catalyst remarkably increased.

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Structure and morphology of a layered Ti-MWW were controled through the delamination, which was conducted in the presence of surfactants and bases. Various conditions of the delamination were studied.

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Stober synthesis, the ammonia-catalyzed reactions of Tetraethyl orthosilicate with water in low molecular weight alcohols, produces highly monodisperse, spherical silica nanoparticles that range in size from 100 to 500 nm. But it is difficult to fabricate useful colloidal crystal. Therefore I controled the size of well-ordered silica nanospheres because of the easy preparing process. I succeeded in fabricating silica spheres assisted by amino acid that range in size from 12 to 300 nm.

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A new hybrid catalyst, Fe₂O₃@Ti-HMS, containing superparamagnetic iron oxide nanoparticles, ordered mesoporous structure, and isolated Ti-oxide moieties has been developed. The Fe₂O₃@Ti-HMS can offer a simple and efficient heterogeneous catalyst system for the oxidation of organic compounds using H₂O₂. Recovery of the catalyst was easily accomplished by external application of a permanent magnet, and the spent catalyst could be recycled without a loss of catalytic performance.

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The present authors have already reported that a hybrid catalyst composed of a Cu-Zn methanol synthesis catalyst and alumina shows a high activity and selectivity for the CO₂ reforming of dimethyl ether. In the present work, performances of a series of hybrid catalysts composed of the Cu-Zn catalyst and oxides which have different acid-base character and physical properties have been investigated.

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Various metal ion exchanged zeolites were used as desulfurization materials of TBM aiming to produce hydrogen from city gas. TBM adsorption capacity of Ag-Y was larger than that of the other metal exchanged Y zeolite under moisture condition. However, the TBM adsorption capacity of Ag-Y decreased with an increase in amount of Ag ion under dry condition. On the other hand, the TBM adsorption capacity of Cu-Y and Zn-Y increased with an increase in amount of metals whether gas contain water or not.

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Ozonolysis of triacylglycerol in vegetable oils was carried out over heterogeneous catalysts in a batch reactor system. The triacylglycerol was completely converted to hydrocarbons with carbon numbers from 9 to 17 (about 10 %) and many oxygen containing organic compounds including aldehydes, ketones, carbonic acids and lactones. The contents and amounts of products were strongly dependent on the properties of the catalysts and reaction conditions.

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