用于液化气脱硫醇过程的MgO/Al2O3固体碱催化剂的研究

讨论了Mg与Al摩尔比、磺化酞菁钴（CoPcS）负载量对MgO／Al2O3—CoPcS脱硫醇催化剂催化活性的影响；探讨了催化剂在液化气（LPG）脱硫醇过程中的失活机理；并将MgO／Al2O3-CoPcS催化剂应用于工厂LPG侧线脱硫醇试验。结果表明：具有较高的Mg与Al摩尔比的MgO／Al2O3-CoPcS催化剂具有较高的表面碱量，在硫醇催化氧化反应中表现出相对高的催化活性；活性组分CoPcS负载量的增加有助于硫醇氧化反应速度的提高，但当负载量过大时，催化剂活性下降；在LPG脱硫醇过程中，催化剂失活的主要原因是毒物（如酸性杂质硫化氢、重组分物质等）使得催化剂表面的碱中心中毒，此外重组分物质堵塞催化剂孔口，使得内表面利用率下降也是导致催化剂失活的原因；在工厂LPG侧线脱硫醇试验中，MgO／Al2O3—CoPcS催化剂显示出高的初活性和较好的稳定性，催化剂累计运行时间可达2000h以上。

STUDY ON THE MgO/Al2O3 SOLID BASE CATALYST FOR LPG SWEETENING

The influences of Mg/Al ratio and the content of CoPcS on the activity of MgO/ Al2O3-CoPcS catalyst in the mercaptan oxidation reaction were studied and the catalyst deactivation was investigated by XRD, CO2-TPD and SEM. The experimental results showed that catalyst with higher Mg/Al ratio resulted in improved catalytic activity than those of lower Mg/Al ratio. It was also observed that the catalyst activity increased with the increase of CoPeS content within a certain range. During the LPG sweetening treatment the catalyst deactivation was caused by the poisoning of basic sites and blocking of pores by the acidic compounds and heavy components in the feed respectively. The MgO/ Al2O3-CoPeS catalyst showed good activity and stability in a commercial LPG side stream sweetening test, and the catalyst could be regenerated for multi-cycle with a cumulative running time of over 2000h.