采用硫代硫酸铵预硫化CoMo和NiMoP催化剂,考察了预硫化剂的负载量对催化剂加氢脱硫活性的影响.对于CoMo催化剂,预硫化剂含量适中,氢气活化后脱硫活性优于硫化氢硫化的对照催化剂.预硫化过程中产生的SO_4~(2-)可修饰Al_2O_3载体,减弱了活性相与金属的相互作用,这可能是催化剂活性增加的原因.硫代硫酸铵含量过低,导致催化剂硫化不完全,脱硫活性下降,而硫化剂含量过高,使活性颗粒长大,因而活性中心数量减少,脱硫活性降低.NiMoP催化剂的活性金属含量高,不易被硫代硫酸铵充分硫化,导致预硫化催化剂活性低于对照的NiMoP催化剂.
Ammonium thiosulfate ((NH_4)_2S_2O_3) was used as a sulfiding agent for presulfiding CoMo and NiMoP catalysts. The effect of the amount of (NH_4) _2S_2O_3 on hydrodesulfurization (HDS) activity was investigated. For the CoMo series, the use of a proper amount of (NH_4)_2S_2O_3 gave a higher HDS activity than when the catalyst was sulfided by H_2S. SO_4~(2-) formed during presulfidation modified the Al_2O_3 support and decreased the interaction between the active phase and support, and the activity was enhanced. However, a smaller amount of (NH_4) _2S_2O_3 used for the presulfidation would result in insufficient sulfidation, while a larger amount of (NH_4) _2S_2O3 increased the particle size of the active phases, and both were harmful to HDS activity. For the NiMoP series, the presulfided catalysts were less active than those sulfided by H_2S. This was ascribed to the high metal content and the addition of P to the catalyst.
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