Effects of alumina phases as nickel supports on deep reactive adsorption of (4,6-dimethyl) dibenzothiophene: Comparison between γ, δ, and θ-alumina

摘要: Abstract γ-, δ-, and θ-phases of alumina were prepared by treating high purity boehmite at 873, 1173, 1273 K, respectively, in air for 6 h. Alumina-supported nickel adsorbents then ultrasonic-aided incipient wetness impregnation Ni(NO3)2 over the three phases with same loading per nm2support. The samples characterized ICP-AES, XRD, FTIR, N2 adsorption–desorption, NH3-TPD, H2-TPR, SEM, HR-TEM. specific performances supports containing evaluated reactive adsorption desulfurization (RADS) dibenzothiophene (DBT) 4,6-dimethyldibenzothiophene (4,6-DMDBT) 473 K atmospheric pressure. It was found that physicochemical properties affected dispersion reducibility thus, RADS performance adsorbents, which followed order Ni/θ-alumina ∼ Ni/δ-alumina > Ni/γ-alumina. However, exhibited nearly constant turnover frequencies (TOF) about 112 89 h−1 DBT 4,6-DMDBT, respectively. Furthermore, a coupled TPO-FTIR analysis spent adsorbent revealed sulfur coke present on surface considered to be major sources deactivation.