Origin of double dinitrogen release feature during fast switching between lean and rich cycles for NOx storage reduction catalysts

The performance of NOx storage and reduction over 1.5 wt% Pt/20 wt% KNO3/K2Ti8O17 and 1.5 wt% Pt/K2Ti8O17 catalysts has been investigated using combined fast transient kinetic switching and isotopically labelled (NO)-N-15 at 350 degrees C. The evolution of product N-2 has revealed two significant peaks during 60 s lean/1.3 s rich switches. It also found that the presence of CO2 in the feed affects the release of N-2 in the second peak. Regardless of the presence/absence of water in the feed, only one peak of N-2 was observed in the absence of CO2. Gas-phase NH3 was not observed in any of the experiments. However, in the presence of CO2 the results obtained from in situ DRIFTS-MS analysis showed that isocyanate species are formed and stored during the rich cycles, probably from the reaction between NOx and CO, in which CO was formed via the reverse water-gas shift reaction. 

Oltre il "Momento dell'Abolizione":Saggio in memoria di Louk Hulsman

This article is written to celebrate the fine contribution and constant optimism of Louk Hulsman to the debate about penal abolition, the rethinking of popular and political discourses on ‘crime’, and the institutionalised responses of the ‘criminal justice system’. Reflecting on his experiences of incarceration and on his critical analysis of the political economic relations of power, Louk Hulsman talked of the defining ‘moment of abolition’ – his reading of Thomas Mathiesen’s ground-breaking text, The Politics of Abolition. Having considered the key elements of Louk Hulsman’s work and its critical challenge to the criminological enterprise, the article explores the apparent political contradiction in campaigning for humane conditions while seeking abolition within the context of an ever-expanding, global prison-industrial complex.