Abstract:
Two kinds of gas-phase carbonization chars, respectively using petroleum ethers and anthracene oils as raw materials, were prepared in the carbonization temperature of 1 000—1 300 °C. The physical structure and CO2 gasification activity of these chars were mainly investigated, and then were compared with those of liquid-phase carbonization chars and coal chars. The main conclusions were drawn as follows. There co-existed the cracking and polymerization reactions in the gas-phase carbonization of petroleum ethers, and the gas-phase carbonization of anthracene oils was mainly dominated by the polymerization reaction. The particles (diameter of 0.1—0.5 μm) from the two kinds of gas-phase carbonization chars presented uniformly spherical. With the increasing carbonization temperature, the diameter of char particles decreased and the mass of chars became denser in the gas-phase carbonization process. An elevated carbonization temperature was favorable for a more ordered carbon micro-crystalline structure of gas-phase carbonization chars. At the same carbonization temperature, the graphitization tendency of gas-phase carbonization chars was the largest, followed by that of liquid-phase carbonization chars, and that of coal chars was the least. The micro-crystalline structure of carbon was not the exclusive factor affecting its gasification activity. The gasification activities of chars prepared in different carbonization processes presented the following order: coal chars>gas-phase carbonization chars>liquid-phase carbonization chars.