FT-IR和SEM用于煤阶对煤催化加氢气化影响的研究

基于加压固定床反应器研究了不同煤阶的煤催化加氢气化效果,对比了煤阶对催化剂添加量、甲烷释放速率以及产品气组成的影响。原煤及气化残渣采用FT-IR和SEM进行表征分析。研究结果表明,不添加催化剂情况下,随着煤阶的升高原煤气化反应性降低,低阶煤的甲烷释放分为两个阶段;加入催化剂之后,3种煤中以神府烟煤的反应性最好,遵义无烟煤和云南褐煤反应性较差。SEM和FT-IR表征结果表明,高阶煤颗粒表面更加光滑、煤结构致密,而煤中的脂肪族结构以及芳香结构振动峰强度随煤阶的降低而升高,催化剂的加入使得脂肪结构吸收峰明显加强。这些差异导致不同煤样催化加氢气化反应活性不同。

FT-IR and SEM study on the effect of coal rank on its catalytic hydrogasification

The effect of coal rank on coal catalytic hydrogasification was studied in a pressured fixed-bed reactor. The catalyst loading, methane release rate and gas composition were compared for coal samples with different ranks. The coal samples and residues were characterized by FT-IR and SEM. The results show that the reactivity of coal decreases with increasing rank of coal without catalyst loading, and the methane release rate from low rank coal is divided into two stages obviously. After adding catalyst, it is suggested that the reactivity of Shenfu bituminous coal performs the best, while that of Zunyi anthracite and Yunnan brown coal is poor. The results of SEM and FT-IR analysis show that the particle surface of high rank coal is smoother and the structure is more compact, and the strength of vibration intensity of aliphatic and aromatic structure increases with decreasing coal rank. All of the differences lead to the different reactivity of catalytic hydrogasification among the coal samples.