Koji Miyake

A nanocontact structure (typically 22×34 nm2) between two NiFe wires was fabricated by an electron-beam lithography and a lift-off method, and the magnetoresistance was measured. The magnetization switching process was artificially controlled by engineering the sample geometry to realize a magnetic structure with a single domain wall (DW) trapped in the nanocontact area. This domain structure was confirmed by magnetic force microscopy observations. The magnetization rotation of 180° was realized

Fe-MFI nanocrystals were synthesized by a dry gel conversion method and showed superior catalytic performance in methanol to olefin reactions.

Propane was found to be dehydrogenated over the Brønsted acid sites derived from incorporated Ga in the 12-membered large micropores of a *BEA-type structure.

Abstract Core‐shell zeolite composite crystals consisting of an MFI structure were prepared by a zeolite overgrowth method. The core and shell zeolites are ZSM‐5 with acid sites and silicalite‐1 (Al‐free MFI zeolite) without acid sites, respectively. The structured core‐shell ZSM‐5/silicalite‐1 catalyst was used for the reactions to produce benzene, toluene, and p ‐xylene (BT p X) from five C 1‐3 feedstocks. The selectivity to total BT p X on ZSM‐5/silicalite‐1 (47‐71 C‐mol%) was much higher tha

Incorporating Ge into the aluminophosphate framework generated weakened Brønsted acid sites, leading to prolonged catalyst lifetimes in the MTO reaction.

Dry reforming of methane (DRM) is an endothermic reaction that consumes energy during operation. In Ni-based catalysts, carbon produced by side reactions leads to catalyst deactivation and damage to the reactor tube. We have developed a catalyst that maintains its activity and suppresses carbon deposition at a low temperature (873 K). New catalysts were synthesized by loading Cr and Ni onto dealuminated β zeolites. The peak shifts in the X-ray diffraction (XRD) measurements suggested that the in