Catalytic co oxidation and H2_{2}O2_{2} direct synthesis over pd and pt-impregnated titania nanotubes

Titania nanotubes (TNTs) impregnated with Pd and Pt nanoparticles are evaluated as heterogeneous catalysts in different conditions in two reactions: catalytic CO oxidation (gas phase, up to 500 °C) and H$_{2}$O$_{2}$ direct synthesis (liquid phase, 30 °C). The TNTs are obtained via oxidation of titanium metal and the intermediate layer-type sodium titanate Na$_{2}$Ti$_{3}$O$_{7}$. Thereafter, the titanate layers are exfoliated and show self-rolling to TNTs, which, finally, are impregnated with Pd or Pt nanoparticles at room temperature by using Pd(ac)$_{2}$ and Pt(ac)$_{2}$. The resulting crystalline Pd/TNTs and Pt/TNTs are realized with different lengths (long TNTs: 2.0–2.5 µm, short TNTs: 0.23–0.27 µm) and a specific surface area up to 390 m$^{2}$/g. The deposited Pd and Pt particles are 2–5 nm in diameter. The TNT-derived catalysts show good thermal (up to 500 °C) and chemical stability (in liquid-phase and gas-phase reactions). The catalytic evaluation results in a low CO oxidation light-out temperature of 150 °C for Pt/TNTs (1 wt-%) and promising H$_{2}$O$_{2}$ generation with a productivity of 3240 mol$_{H2O2}$ kg$_{Pd}$$^{-1}$h$^{-1}$ (Pd/TNTs, 5 wt-%, 30 °C). Despite their smaller surface area, long TNTs outperform short TNTs with regard to both CO oxidation and H$_{2}$O$_{2}$ formation

Genome-wide association study of neocortical Lewy-related pathology

Peer reviewe

Apprenticeship, Philosophy, and the 'secret Pressures of the Work of Art' in Deleuze, Beckett, Proust and Ruiz; or Remaking the Recherche

If Beckett’s study of Proust has belatedly received the criticisms its author no doubt anticipated, another influential study published a little over thirty years later has, like its predecessor, elicited, among others, the critical response that the author of the Recherche finds himself recruited to the self-serving project of the critic. Gilles Deleuze’s Proust is cast not as the pessimistic Schopenhauerian which Beckett makes of him, but rather, as a force of affirmation in the quasi-Nietzschean register of the ‘powers of the false’. Deleuze would studiously augment his 1964 study with two additions in an effort to improve it. The consequence of this is to render its textual genesis a testament to one of the themes, and for Deleuze the theme of the Recherche, namely, apprenticeship. Moreover, the ‘pedagogy’ to which Proust’s novel subjects the philosopher becomes itself an example of the ‘untimely’ operations of art upon what Deleuze calls the upright or dogmatic image of thought