abstracts - Институт катализа им. Г.К. Борескова

OP-I-10activity even with platinum. PCO over titanium dioxide may present a potential alternative forthe air treatment strategies mentioned above for the ambient conditions, at which the reactionproceeds effectively, although higher temperatures may be also applied: PCO may convertsulphur into non-volatile sulphate, which opens certain prospective for the research.UDMH is used massively as the RP component; the problem is derived from its spillscreating the fatal hazard the population is exposed to. UDMH and the products of its naturaloxidation, nitrosoamines, are highly toxic, carcinogenic and mutagenic. The problem arosedue to multiple space rocket launches, military activities and the disarmament accompaniedwith massive storage termination and transportation. Little may be found published onUDMH decomposition avoiding secondary pollution with NO x inevitably formed inincineration.Some CWA are organophosphorous and organosulphurous compounds. One of the mostdangerous CWA, O-ethyl-S-2-(N,N-diisopropilamino)-ethylmethylthiophosphonate, a.k.a.VX-gas, was accumulated in large amounts and needs safe disposal. Destruction of CWA isan urgent task in view of requirements of CWA convention and possible emergencyexposures. PCO is the most powerful method for degradation of organic compounds and maybe used for CWA elimination.The reactions’ pathways, their kinetic characteristics, the optimum conditions for the bestperformance at the lowest cost were set as objectives of the present research.ResultsThe predominant role of OH-radical was established in aqueous PCO reactions of lignin.This found a proof in the following facts:- the PCO efficiency increased with increasing concentrations of lignin; maximumefficiency, characteristic for aromatic compounds, was not achieved up to 400 ppm of lignin;- the highest PCO efficiency was observed in neutral and slightly basic media, despite thefact that the best adsorption was in acidic media;- PCO benefited from introduction of hydrogen peroxide in acidic medium due topromoted OH·-radical formation;- there was no direct mineralisation of lignin on the photocatalyst surface, since aldehydeswere observed in the bulk solution;- the addition of Fe 2+ ions, up to 0.05 mM, to the lignin solution leads to the drasticincrease of PCO efficiency; a further increase in ferrous ion concentration results in adecrease in PCO efficiency.Wet oxidation under sub-critical water conditions showed promising results in ligninelimination from concentrated debarking waters.PCO and thermal catalytic decomposition (TCD) products for ethanethiol (ET,CH 3 CH 2 SH) in continuous flow reactor were SO 2 , CO, CO 2 and H 2 O, acetic acid was93