abstracts - Институт катализа им. Г.К. Борескова

OP-I-10identified as PCO by-product.The limits of ET concentration and the reaction conditions, atwhich the reactor work was stable for indefinite time, were established. The deactivation ofTiO 2 was found to follow the coverage of the catalyst only with titanium sulphate: no organiccompounds were found in catalyst rinsing water. The reaction kinetics appeared to beindependent on the reaction temperature, which may be explained by adsorption decreasingwith temperature compensating the increase of reaction rate. TCD appeared to decompose ETto products similar to PCO with much smaller rate and shorter catalyst lifetime.The ultimate products from gas-phase PCO of UDMH include nitrogen, ammonia, carbondioxide and water. N-methyl methanimine CH 3 -N=CH 2 or ethylenimine (CH 2 ) 2 NH, methylisocyanate CH 3 -N=C=O, and methyl amine CH 3 -NH 2 were identified as transient PCO byproducts.The apparent PCO reaction pathway is:2 (CH 3 ) 2 N-NH 2 -> 0.5N 2 + NH 3 + 2 CH 3 -N=CH 2 or 2(CH 2 ) 2 NH (1)CH 3 -N=CH 2 or (CH 2 ) 2 NH -> CH 3 -N=C=O + H 2 O -> CH 3 -NH 2 + CO 2 (2)CH 3 -NH 2 -> HCO-NH 2 + H 2 O (3)HCO-NH 2 (formamide) -> NH 3 + CO 2 (CO) (4)NH 3 -> NO, N 2 O, HNO 3 (5)Nitrous oxide (N 2 O) was only observed adsorbed on the TiO 2 in batch experiments. Nonitrogen oxides were observed in continuous flow or transient PCO due to the low PCO ratefor ammonia. The UDMH catalytic decomposition products, in the absence of UV light weresimilar to the PCO ones, although neither nitrogen nor nitrogen oxides were observed. Theultimate N-containing species in the batch PCO experiments were N 2 (90-92%), HNO 3 (8-10%) and NH 3 (