Yoshimi Okada

95 Unimodal porous spinel and its application to a new cataalyst material

Abstract A spinel-type oxide is appropriate for use as a catalyst material due to excellent thermal stability and mechanical strength, although the catalytic use is restricted because of low surface area. Unimodal Porous Spinel (UPS) can be prepared by a simple impregnation method using the pore-controlled γ-alumina precursor. The sharp pore distribution was definite in calcined UPS, and it has a high surface area of more than 115 m2/g-Al2O3. Two or three metal sources can also be impregnated by this method. The catalyst using UPS of the ZnAl2O4 system as a support showed good performance on durable activity in dehydrogenation of isobutane.

Preparation of TiO2 nano-particle photocatalysts by a multi-gelation method: the effect of pH change

TiO2 photocatalysts were prepared by a multi-gelation method and the effect of the changes in the pH during the pH swing times, i.e., by a controlled pH swing, on the morphology of the TiO2 particles was investigated. The photocatalytic properties of the TiO2 catalysts prepared by controlled pH swing were compared with TiO2 particles prepared without adjusting the pH during the swing times. The photocatalytic degradation reaction of these TiO2 catalysts was investigated by comparing their effectiveness in 2-propanol oxidation. The experimental results showed that the TiO2 photocatalysts prepared without adjusting the pH performed better in controlling the important parameters of the catalysts such as particle size, surface area, anatase/rutile phase ratio and pore size, as well as pore volume than the TiO2 photocatalysts prepared by a controlled pH swing method.

Topic: Organic Hydride for Hydrogen Energy Carrier

Hydrogen storage and transportation are critically important to realize a low-carbon society. A hydrogen supply chain concept has recently been proposed by Chiyoda Corporation on the successful basis of catalytic methylcyclohexane dehydrogenation, coupled with well-established toluene hydrogenation and existing delivery infrastructures at low cost. The SPERA Hydrogen™ process ensures liquid storage of hydrogen energy for safe large-scale and long-distance transportation (even abroad) under ambient temperature and atmospheric pressure. Overall costs would generate business risks. High-equilibrium temperatures and large enthalpy change (ΔH) are deficit in this reversible reaction couple. Utilization of various types of exhaust heat and development of a compact-size dehydrogenation reactor should be explored.