SYNTHESIS OF THE POROUS METAL-CARBON MATERIALS BASED ON THE BIRCH WOOD MODIFIED WITH ZINC CHLORIDE AND FERROCENE
Abstract
The synthesis of the porous metal-carbon materials from a birch sawdust, zinc chloride and ferrocene was studied at different temperatures. It has been found that modifiers shift decomposition processes of wood to low-temperature region and intensify the process of pyrolysis to high-temperature region. Addition of ferrocene in sample leads to additional stage of intensive decomposition of sample at 750 °С.
Porous carbon products with high specific surface of 1100 m2/g were received during carbonization of samples, as one modifier (ZnCl2), and two (ZnCl2, Fe(C5H5)2), up to 400 °C. Reduction of the specific surface of carbon product is observed when the carbonization temperature is 800 °C, wherein the product of wood with ZnCl2 has surface area 606 m2/g, and product of wood with additives of ZnCl2 and Fe(C5H5)2 – 932 m2/g. It was established that the disclosure of porous structure of products during carbonization of modified samples occurs mainly due to the removal of water-soluble substances of low-temperature products and high-temperature pyrolysis.
Special textural shapes of carbon product obtained from the modified raw materials with two reagents were detected. The addition of ferrocene to initial mixture leads to formation of truncated cone-shaped hexagonal crystallites on the composite surface carbonized at400 °C. It is supposed that the growth of the crystallites of low-temperature composite is due to coordinating interaction of ferrocene with ligninocellulose polymer and zinc ion.
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