III International Conference

PP-III-59UTILIZATION OF WASTE BIOMASS AND OBTAINING ZrO 2 WITH LARGESURFACE AREAZaletova N.V., Turakulova A.O., Burova M.V., Muravieva G.P., Lunin V.V.Chemical Department, M.V. Lomonosov MSU, Moscow, RussiaE-mail: n_zaletova@mail.ruSawdust impregnated by ZrO(NO 3 ) 2 in the ratios of 1/1, 1/10 (ZrO 2 /sawdust,w/w) wereused as starting materials for preparation of ZrO 2 . Optimum parameters of the treatment wereselected (carbonization: 500 o C, 1 hour; calcinations: 600 o C, 4 hours). The following valuesfor surface area were obtained: 13 and 38 m 2 /g for the ratios ZrO 2 /sawdust=1/1 and 1/10correspondingly. ZrO 2 was also prepared by direct calcination of precursor (sawdust/ZrO(NO 3 ) 2 ) in the ratio 1/10. Its surface area was 33 m 2 /g.The surface of ZrO 2 exhibits acid-base and reductive-oxidative properties at the sametime, that’s why zirconia finds application in numerous catalytic processes (isomerization,polymerization, polycondensation of organic compounds, etc.) [1]. There are plenty ofmethods for ZrO 2 obtaining, which require the use of chemical agents and besides producewastewater while washing off residual matter. Searching for processes that use fewer toxicchemicals and produce less waste while using less energy is of great importance nowadays.That is one of the basic concepts of green chemistry. Besides utilization of biomass has acertain environmental contribution as well. So obtaining of metal oxides via pyrolysis ofsawdust impregnated by salts of metals has two advantages. The first one is utilization ofbiomass and obtaining carbon black, which is widely applied. And the second is obtainingmetal oxides, which are expected to be promising catalysts due to unique properties thatappear as a result of nontraditional method of synthesis [2]. The aim of the present work is tostudy physicochemical properties of zirconia, obtained in the result of catalytical pyrolysis ofpinewood sawdust. Sawdust (particle size varying from 0.63 to 1.25 mm) impregnated byZrO(NO 3 ) 2 were used as a precursor. Samples were prepared in the ratios of 1/1, 1/10(ZrO 2 /sawdust, w/w). In the end of pyrolysis product contained carbon black and zirconia(partially reduced). To obtain pure ZrO 2 calcination of these products was performed.Conditions for the pyrolysis and calcinations were chosen according to the data, achieved byDifferential Thermal Analysis (DTA) and Thermogravimetry (TG). The process of pyrolysiswas carried out under a nitrogen atmosphere and was characterized by the followingparameters: dynamic segment - heating rate 15 o /min up to 500 o C, isothermal segment –temperature 500 o C, isothermal time 1 hour. For calcinations, samples were held at 600 o C for581