Ryohei Takahashi

TL;DR: Using aluminum chloride as a catalyst, polycyclic aromatic hydrocarbons were converted into carbons of two different structures, although at the early stage all carbonization processes proceeded via molten phase as discussed by the authors.

TL;DR: In this article, the authors describe the enrichment of hydrothermally altered volcanic and sedimentary rocks with arsenic (As) and lead (Pb), and the effects of pyrite and calcite on the mobilities and release mechanisms of these toxic elements under oxic and anoxic conditions.

TL;DR: In this paper, the authors describe the mobilization and speciation of As found in hydrothermally altered rock under oxic column conditions and show that the column experiments showed that the infiltration rate, bulk density and rock bed thickness affected the duration of water residence, which in turn influenced the pH of the rock-water system.

TL;DR: In this article, the reactivity of coal-tar pitch in reductive alkylation and hydrogenation with the aid of alkali metals was investigated to obtain basic information on the possibility of changing their graphitizability and the orientation of their cokes.