Evaluation of Synthetic Conditions for H3PO4 Chemically Activated Rice Husk and Preparation of Honeycomb Monoliths

J. M. Jandosov; N. V. Shikina; M. A. Bijsenbayev; M. E. Shamalov; Z. R. Ismagilov; Z. A. Mansurov

doi:10.18321/ectj287

Authors

J. M. Jandosov Al-Faraby Kazakh National University, 71, al-Farabi av., 050038, Almaty, Kazakhstan
N. V. Shikina Boreskov Institute of Catalysis, 5, Pr. Akad. Lavrentieva, 630090, Novosibirsk, Russia
M. A. Bijsenbayev Al-Faraby Kazakh National University, 71, al-Farabi av., 050038, Almaty, Kazakhstan
M. E. Shamalov Al-Faraby Kazakh National University, 71, al-Farabi av., 050038, Almaty, Kazakhstan
Z. R. Ismagilov Boreskov Institute of Catalysis, 5, Pr. Akad. Lavrentieva, 630090, Novosibirsk, Russia
Z. A. Mansurov Al-Faraby Kazakh National University, 71, al-Farabi av., 050038, Almaty, Kazakhstan

DOI:

https://doi.org/10.18321/ectj287

Abstract

Activated carbons in this work were prepared from rice husk by phosphoric acid activation followed by alkaline desilication. Pseudo-random selection of 16 rice husk samples was subjected to carbonization at the
following conditions: 0.5 to 2 h of activation time, 300-600 ºС and Н₃РО₄/precursor (wt/wt) impregnation ratio of 0.5 to 2. Concentration of NaOH desilication solution varied from 0.5 to 2M. It was found that out of the four factors impregnation ratio is clearly the strongest and at the impregnation ratio of 2 for 1 h at 500 °C N₂ BET-surface area reaches 1690 m²/g (S_BET_(Ar)=2492 m²/g) while pore volume becomes 1.95 cm³/g. Elemental analysis showed highest carbon content for this sample (87.96%). All samples have insignificant amount of Si and traces of metals, but considerable amount of phosphorus. Blocks of honeycomb structure prepared from Ca-montmorillonite and desilicated carbonized rice husk (impregnation ratio is 1.5, 1 h at 600 ºC) have BET-surface area obtained by thermal desorption of argon up to 856 m²/g.

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