煤焦油催化裂解过程钙-镁催化剂的抗积碳性能

采用两段式固定床反应器进行了煤焦油Ca-Mg催化裂解的实验研究，通过X射线衍射(XRD)、扫描电镜(SEM)及比表面积测试(BET)等手段表征反应前后Ca-Mg催化剂的物化特性，考察了添加Fe2O3助剂对Ca-Mg催化剂抗失活性能的影响。结果表明：长时间裂解反应中积炭叠加导致Ca-Mg催化剂失活，当积炭率达到3%~5%时，出现焦油裂解率降低的拐点；Ca-Mg催化剂中Fe2O3的加入，因积炭与Fe2O3发生慢速固-固反应，明显延迟了Ca-Mg催化剂活性拐点的出现，从而提高了Ca-Mg催化剂的抗积炭性能。

Anti-Carbon Deposition Performance of Ca-Mg Catalyst in Coal Tar Catalytic Cracking Process

A two-stage fixed-bed reactor was employed to investigate the catalytic cracking of coal-tar on calcium-magnesium catalysts surface. Physicochemical properties of the Ca-Mg catalyst before and after the reactions were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and specific surface area testing (BET). Effects of iron addition on the anti-deactivation activity of the Ca-Mg catalyst were discussed. Experimental results suggest that accumulation of carbonaceous deposits under long-time cracking reactions leads to the deactivation of Ca-Mg catalyst. When carbonaceous deposits ratio on the catalyst reaches 3%-5%, tar cracking activities will start to decrease. When Fe2O3 is added, the solid-solid reaction occurs between carbonaceous deposits and Fe2O3. This can postpone the inflection points of catalyst deactivity, and thus improve the capability of carbon deposition resistance of the Ca-Mg catalyst.