低温等离子体改性固体碱脱硫醇催化剂性能

摘要

实验以低温等离子体,改性固体碱(MgO/C-CoPcS)脱硫醇催化剂.讨论了低温等离子体不同放电功率对催化剂颗粒分散度、碱量、氧化中心数量以及催化活性的影响,研究了低温等离子体再生催化剂的性能.以SEM、XRD、BET、FTIR、CO2-TPD等表征方法对催化剂的物性结构进行了分析.实验结果表明:低温等离子体改性催化剂活性组分平均粒径减小,分散度提高,并发生活性组分的表面富集,催化剂活性明显提高,反应15 min时硫醇转化率高于95.4%,反应20 min时脱硫醇转化率接近100%;低温等离子体有效地分解了堵塞催化剂孔道的大分子物质实现催化剂再生,再生催化剂初始活性达到71.6%,反应25 min时硫醇转换率可达96.7%,催化活性接近初始催化剂水平.%Low temperature plasma was used to modify solid base catalyst (MgO/C-CoPcS) for desulfuration. The discharge power of low-temperature plasma on the catalyst particle dispersion, the base amount, oxidation center, catalytic activity and regeneration of the deactivated catalyst under low temperature plasma was studied. The structure and properties of the catalysts were studied by means of BET, SEM, FT-IR, power X-ray diffraction (XRD) and CO2-TPD. The results indicated that the average particle size decreased, dispersity increased, the active centers on the surface was enriched, and the catalytic performance had been improved through the plasma treatment. The conversion rate of mercaptan reaction was above 95.4％ after reaction for 15 min and near to 100％ for 20 min. At the same time, the macromolecules which block the channels of the catalyst can be decomposed and the deactivated catalyst can be regenerated effectively by using the low-temperature plasma. The initial activity of the regenerated catalyst reached 71.6％, the conversion of mercaptan was up to 96.7％ for 25 min, near to the level of the initial catalyst.