Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-V-15DEVELOPMENT OF TWO-STAGE PROCESS OF PREPARATION OFMICRO- AND MESOPOROUS CARBONS WITH DEVELOPEDTEXTURE FROM HIGH-ASH BIOMASSP.M. Yeletsky 1 , V.A. Yakovlev 1 , E.A. Ustinov 2 , M.S. Mel’gunov 1 , V.N. Parmon 11 Boreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090 Novosibirsk,Russia2 Provita Ltd., 3-7, Line 24, Vasilievsky ostrov, 199106 Saint-Petersburg, RussiaE-mail: yeletsky@catalysis.ruThere are many ways to synthesis of amorphous carbon materials with high specificsurface area from a lot of precursors – from chemicals and polymers to petrochemical wastesand biomass [1]. Vegetable biomass is often used for preparation of carbon materials byphysical or chemical activation. There is the type of biomass, possessing anomaly high ashcontent, the main component of the ash is amorphous SiO 2 (more than 95 w. %). Other ashcomponents are the oxides and some of other compounds of alkaline and alkaline-earthmetals, iron, copper etc. Rice husk (RH) is a «leader» on content of the ash among thebiomass and contains up to 23 w. % of silica [2-4]. So the main feature of RH as a carbonprecursor is that the silica can affect on texture properties of the preparing carbon materials.The work is devoted to a development of a two-stage method of micro- and mesoporouscarbons preparation from high-ash biomass by the example of rice husk (RH). The process ofcarbonaceous materials preparation, in the whole, consists of two main stages: a preliminarycarbonization of the high-ash biomass in fluidized catalyst bed reactor and a treatment of theprepared carbon-silica composite with sodium and/or potassium compounds in a staticreactor. At the same time, the both stages have the following principle differences:− in order to prepare the microporous carbons, one impregnates the product of the RHcarbonization by solution of KOH with following drying and activation at 700–900 °С;− in order to prepare the mesoporous carbons, one mixes equimolar mixture of Na 2 CO 3and K 2 CO 3 with the product of RH carbonization mechanically with following hightemperatureleaching at 750–1000 °С.Fig. 1. The principle scheme of the process of micro- and mesoporous carbons producing from rice husk196