Hiroshi Yoshioka

TL;DR: In this paper, the authors investigated the vapor phase nitration of benzene over acidic catalysts utilizing diluted nitric acid (dil. HNO 3 ) as a nitrating agent and found that several solid acid catalysts such as montmorillonite ion-exchanged with a multivalent metal cation and mixed metal oxides containing TiO 2 or ZrO 2 exhibited such high activities as 80-90% yields of nitrobenzene (STY=0.6lg/g cat h) for more than 480h on-streams.

TL;DR: In this article, a process for producing.alpha-olefin polymers of a high stereoregularity which comprises homopolymerizing an.alpha.-olefin having 3 to 10 carbon atoms or copolymerizing said polymers with other olefins of the same group or with ethylene using a catalyst system comprising three components (a), (B) and (C): (A) a solid catalyst produced by reaction among a solid product described below, a compound group (III) comprising at least one compound having an O-C=O linkage and at

TL;DR: In this paper, a strongly polarized pseudo-iminium cation was proposed as an active species and the catalytic activity was greatly increased by addition of a co-catalyst, trifluoromethane sulfonic acid.

TL;DR: In this paper, the authors investigated the vapor phase nitration of benzene by dilute nitric acid and found that mixed metal oxides containing TiO2 or ZrO2 was improved greatly by the treatment with sulfuric acid at 500°C and that the catalytic activity of heteropolyacid can be increased greatly by partial neutralization with Cs or Tl.

TL;DR: In this paper, the authors have succeeded in keeping a high nitration activity of the supported sulfuric acid catalyst for more than two months by co-feeding a trace amount of sulfuric acids (H 2 SO 4 /HNO 3 ǫ = 1/5000 (wt. ratio).