Investigation On The Hydrodesulrization Performance Of The Mo/Beta Catalyst

In this paper,the Mo/HBeta ? CoMo/HBeta and NiMo/HBeta catalysts were prepared by isometric impregnation methods,and characterized by XRD ? NH₃-TPD and BET methods.The hydrodesulfulrization?HDS?performance o f the catalysts was evaluated by using 0.6m% dibenzothiophene?DBT?decane as the model reactant in the high-pressure micro-reactor.Results show that the experiment of preparation of catalyst belongs to HBeta phase peak is keeping in good condition,active component into HBeta molecular sieve phase within the body,causing deviation of 2?.The active component of Mo,in the form of Metal oxygen clusters into the HBeta molecular sieve;while the additives of Ni?Co,in the form of the metal cation into the molecular sieve.When the calcine temperature is the same,as the mass increasing,the 2? tends to increase,the corresponding d-value decreases too,the unit cell contraction.When the mass amount is the same,as the calcine temperature is increasing.The 2? is decreasing too,and the corresponding d-value increase,the unit cell expansion.Same calcine temperature for the preparation of Mo/HBeta catalyst,with the increasing of mass,total acid catalyst quantity to increase,because the active component is in the form of metal oxygen clusters into the bulk phase of molecular sieve specific to form a single composite.When the mass amount is the same,the total amount of acid of the prepared Mo/HBeta catalyst will decrease as the calcine temperature increasing;Compared with the Mo/HBeta catalyst,the total amount acid of NiMo/HBeta and CoMo/HBeta catalysts respectively decreases,due to additive element in the form of Ni or Co metal cations into the molecular sieve body phase,replacing H⁺ within the phase,resulting in a total amount of acid reduced.With the Ni / Mo increases and Co / Mo atomic ratio of the total amount of acid produced corresponding NiMo catalyst / HBeta and CoMo/HBeta than Mo/HBeta catalyst increases,the corresponding surface area also showed an increasing trend,and with the increasing the Ni/Mo or Co/Mo atomic ratio of NiMo/HBeta and CoMo/HBeta catalyst has a little effect in the specific surface area.The condition of prepared Mo/HBeta catalysts is that the reaction pressure of 4.0 MPa,reaction air speed of 5h^-1,reaction temperature 270?,290 ?and 310?,the calcine temperature of 500?,Mo mass of 8m%,showed the highest activity of DBT hydrodesulfurization.Its conversion rate reached 54.6%,68.1% and 76.8% respectively,compared with the same mass 6m% of Mo,increased by 6.6%,0.9% and 3.3% respectively;compared with the same mass 8m% of Mo,600 ?calcine temperature preparation of Mo/HBeta catalyst increased by 15.5%,5.9% and 4.9%,respectively.The best preparation conditions of this experiment catalyst is the mass of 8m%,the calcine temperature is 500 ?The addition of Ni?Co additives is benifited for Mo/HBeta DBT hydrodesulfurization catalyst activity.When the pepared catalyst atomic ratio in Ni/Mo and Co/Mo is 0.3,the DBT hydrogenation desulfurization conversion rate reached 55.4%,77.7%,91.6% and 55.4% r69%,85.9% respectively,When the pepared catalyst atomic ratio in Ni/Mo and Co/Mo is 1.0,the DBT hydrogenation desulfurization conversion rate reached 51.6%,74.8%,88.6% and 51.6% 65.1%,75.9%,respectively,compared with the pepared catalyst atomic ratio of 0.3,the corresponding data was reduced by 3.8%,2.9%,3.0% and 4.9%,3.9%,10.0%,shows that as the Ni/Mo and Co/Mo of atomic ratio increasing,the HDS activity showed a decreasing trend,and the catalytic performance of Ni additives is better than that of the corresponding Co additives.