煤燃烧过程中碳、氧官能团演化行为

Evolution of carbon and oxygen functional groups during coal combustion

采用X射线光电子能谱(XPS)系统研究燃烧过程中准格尔褐煤及其煤焦颗粒表面中碳、氧的存在形态及演化过程.研究结果表明,准格尔褐煤颗粒表面含碳官能团中石墨化碳含量非常低,但同时具有一定含量的双键碳;含氧官能团中无机氧含量较低,有机氧含量相对较高.随着燃烧的进行,颗粒表面碳、氧官能团呈现不同的变化趋势.

Combustion experiment was carried out with a lignite from Junggar, west China at different temperatures in a drop tube furnace. The Cls and Ols spectra from pulverized Junggar lignite and their chars were evaluated with X-ray photoelectron spectroscopy （XPS）. It was shown that the carbon functional group contained a very small amount of graphitized carbon and some ether or hydroxyl group. Oxygen functional group was combined with inorganic oxygen and organic oxygen and the organic oxygen content was relatively higher. During combustion the increase of graphitized carbon and π-π＊ carbon corresponded to a decrease of single-bond carbon and double-bond carbon.