The hydrotreating of waste cooking oil (WCO) to produce fuels not only solves waste problem but also recycles energy. CoMoS is regarded as an effective catalyst for the deoxygenation of triglyceride during the hydrotreating process; however, it is easy to deactivate. This article studied the deactivation mechanism of a supported CoMoS commercial catalyst during the hydrotreating of WCO. It was the first time to find triglyceride deoxygenation over different active sites during CoMoS catalyst deactivating process: saturated hydrocarbons were the primary products over MoS₂ on the presulfided CoMoS catalyst, and unsaturated hydrocarbons were produced over MoO₃ on the spent CoMoS catalyst as the transformation of the MoS₂ into MoO₃ occurred under high temperature operation. Three causes were observed for the deactivation of the studied catalyst: by-product water, loss of sulfur, and coke deposition. Low temperature operation at 275 °C can control the deactivation of CoMoS catalyst due to coke deposition. In-situ drying and resulfiding the spent catalyst were proposed as methods to regenerate the spent catalyst.

废食用油（WCO）的加氢处理以生产燃料，不仅解决了废物问题，而且还回收了能源。CoMoS被认为是加氢处理过程中甘油三酸酯脱氧的有效催化剂。但是，很容易将其停用。本文研究了WCO加氢处理过程中负载的CoMoS工业催化剂的失活机理。这是首次在CoMoS催化剂失活过程中的不同活性位点上发现甘油三酸酯脱氧：饱和烃是预硫化CoMoS催化剂上MoS ₂上的主要产物，而废MoMo ₃上MoO ₃上产生了不饱和烃作为转化MoS ₂转化为MoO ₃发生在高温下操作。观察到使催化剂失活的三个原因：副产物水，硫的损失和焦炭沉积。275°C的低温操作可控制由于焦炭沉积而导致的CoMoS催化剂失活。提出了将废催化剂原位干燥和再硫化作为再生废催化剂的方法。