P和NTA对Co-Mo选择性加氢脱硫催化剂性能的影响

EFFECT OF P AND NTA ON THE CATALYTIC PERFORMANCE OF Co-Mo SELECTIVE HYDRODESULFURIZATION CATALYST

以TiO2-Al2O3复合氧化物为载体分别制备了一系列添加助剂P和螯合剂NTA的Co-Mo负载型加氢脱硫催化剂,并对其进行了BET、TPR和SEM表征。以FCC汽油重馏分为原料,考察了助剂P、螯合剂NTA对催化剂催化加氢脱硫性能的影响。结果表明,添加适量P和NTA可有效改善活性组分在载体上的分散状态,NTA能够减弱活性组分与载体间的相互作用,促进活性组分的还原,从而有利于催化剂加氢脱硫活性和选择性的提高。

A series of Co-Mo hydrodesulfurization catalysts using TiO2-Al2O3 support was prepared adding P additive and nitrilotriacetic acid （NTA） chelate, respectively. These catalysts were characterized by nitrogen adsorption-desorption, TPR and SEM techniques. The effect of P and NTA on the catalytic performance of these catalysts was evaluated using heavy FCC naphtha as feed. Results showed that adding a suitable amount of P and NTA during catalyst preparation could significantly improve the dispersion of activated metals on the catalyst support ; the existence of NTA could weaken the interaction between support and active components, and that would be helpful for the reduction of active components, thus the hydrodesulfurization activity and selectivity of the catalyst was improved.