Development of brown coal porosity under thermolysis with alkalis of different nature
A comparison has been made of porous structure characteristics of thermolysis (800°С, 1 h) solid products from Aleksandria brown coal (BC) and “BC-MOH” (М=Li, Na, K) compounds prepared by impregnation of coal with alkali metal hydroxide aqueous solution. Porous structure characteristics were calcula...
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| Date: | 2008 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | Russian |
| Published: |
Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine
2008
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| Online Access: | https://surfacezbir.com.ua/index.php/surface/article/view/274 |
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| Journal Title: | Surface |
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Surface| Summary: | A comparison has been made of porous structure characteristics of thermolysis (800°С, 1 h) solid products from Aleksandria brown coal (BC) and “BC-MOH” (М=Li, Na, K) compounds prepared by impregnation of coal with alkali metal hydroxide aqueous solution. Porous structure characteristics were calculated by different methods basing on data of low-temperature (77 К) adsorption-desorption nitrogen isotherms. Hydroxides MOH were found to promote adsorbent porosity development; total pore volume increase with increasing cation diameter. In alkali presence, ~ 4 nm diameter pores are mostly developed and this effect becomes more evident in a row of alkali LiОН < NaОН < KОН. Potassium hydroxide promotes micropore (≤ 2 nm) development, LiОН and NaОН – inhibit it. КОН is the most effective reagent for brown coal conversion into adsorbents. |
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