Effect of Preparation Condition on Pore Structure and Heavy Oil Sorption of Charcoals
Effect of Preparation Condition on Pore Structure and Heavy Oil Sorption of Charcoals
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制备条件对木炭孔隙结构及重油吸附的影响
DOI：
10.2472/jsms.53.818
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Inagaki
中科院分区：
文献类型：
--
作者：
N. Iwashita;Y. Nishi;Y. Sawada;M. Inagaki
木炭由三种植物在不同的碳化条件下制备：轻木（Ochroma lagopus Sw）、巨型银合欢（Leucaena leucocephala (Lam.) de Wit）和毛竹竹（Phyllostachys pubescens）。在 SEM 下观察各种木炭的断裂横截面的孔隙结构，并利用水银孔隙率测定法进行评估。通过直接浸泡在油中测定木炭对 A 级重油的吸附能力。研究发现，木炭的孔隙结构不仅很大程度上取决于前体植物，还取决于碳化条件，特别是加热速率。以 50°C/min 的加热速率制备轻木炭。真空下对 A 级油具有相对较高的吸附能力，约为 30g/g 木炭。另外两种木炭（来自巨型 ipil-ipil 和 Mousou chiku）的容量要低得多，约为 1.5 克/克碳。孔隙占有率（吸附油体积与总孔隙体积之比）对平均孔隙半径的依赖性表明，直径大于 1μm 的孔隙对稠油吸附起主要作用。
Charcoals were prepared under various conditions of carbonization from three kinds of plants: balsa (Ochroma lagopus Sw), giant ipil-ipil (Leucaena leucocephala (Lam.) de Wit) and mousou chiku (Phyllostachys pubescens). The pore structure of the various charcoals was observed on fractured cross-sections under SEM and was evaluated utilizing mercury porosimetry. The sorption capacity of the charcoals for A-grade heavy oil was determined by direct soaking in oil. It was found that the pore structure of the charcoals depended strongly on, not only, the precursor plants but also carbonization conditions, particularly heating rate. Balsa charcoals prepared with a heating rate of 50°C/min. under vacuum gave a relatively high sorption capacity for A-grade oil, approximately 30g/g of charcoal. The other two charcoals, derived from giant ipil-ipil and Mousou chiku, had a considerably lower capacity, approximately 1.5g/g-carbon. The dependence of pore occupancy, the ratio of volume of oil sorbed to total pore volume, on the average pore radius indicated that pores with a diameter above 1μm were largely responsible for heavy oil sorption.