The surface properties of aluminated meso–macroporous silica and its catalytic performance as hydrodesulfurization catalyst support

Abstract

Aluminated mesoporous silica was prepared by multiple post-grafting of alumina onto uniform mesoporous SiO 2 , which was assembled from monodisperse SiO 2 microspheres. Hydrodesulfurization (HDS) catalyst was prepared by loading Ni and Mo active components onto the aluminated uniform mesoporous SiO 2 , and its HDS catalytic performance was evaluated using hydrodesulfurization of dibenzothiophene as the probe reaction at 300°C and 6.0 MPa in a tubular reactor. The samples were characterized by N 2 physisorption, scanning electronic microscopy, Fourier transform infrared spectrum, X-ray diffraction (XRD), temperature-programmed desorption of ammonia (NH 3 -TPD), 27 Al nuclear magnetic resonance ( 27 Al-NMR) and high-resolution transmission electron microscopy (HRTEM). The results showed that the Si-OH group content of SiO 2 was mainly dependent on the pretreatment conditions and had significant influence on the activity of the NiMo catalyst. The surface properties of the aluminated SiO 2 varied with the Al 2 O 3 -grafting cycles. Generally after four cycles of grafting, the aluminated SiO 2 behaved like amorphous alumina. In addition, plotting of activity of NiMo catalysts supported on aluminated mesomacroporous silica materials against the Al 2 O 3 -grafting cycle yields a volcano curve.

Hydrotreatment of FCC Gasoline Catalyzed by CoMo Bifunctional Catalysts: The Effects of Acidity on Catalytic Performance

“…Additionally, the XRD peaks of MCM-41 were at 2θ = 2.3, 3.9, and 4.6°. , It can be seen that there was a relatively weak diffraction peak at 2.3°, which can be attributed to the high dispersion of MCM-41 in γ-Al 2 O 3. However, in the small-angle range of 0.6–5 o , there was no obvious characteristic peaks of MCM-41 for the AM-10 catalyst, which can be explained that the loading of Co and Mo caused the loss of the long-range ordering …”

“…With the increasing recognition of environmental protection, many countries and regions have adopted more stringent regulations for the sulfur content level of commercial gasoline, which brings a severe challenge for the modern refining industry to manufacture clean gasoline. − FCC gasoline is one of the main components in the gasoline pool and contributes to approximately 90% sulfur of commercial gasoline. , Hence, the reduction of the sulfur content in FCC gasoline is of great significance to produce clean gasoline. Currently, hydrodesulfurization (HDS) has still been widely regarded as an effective process to remove sulfur compounds from FCC gasoline in refineries.…”

“…Currently, hydrodesulfurization (HDS) has still been widely regarded as an effective process to remove sulfur compounds from FCC gasoline in refineries. The core of the deep HDS process is highly efficient catalysts. , Normally, conventional HDS catalysts with Co- or Ni-promoted MoS 2 are mainly dispersed on γ-Al 2 O 3 , exhibiting good HDS activity but usually cause a great loss of research octane number (RON). ,− It is known that FCC gasoline contains 20–50 vol % olefins, which are one of the main RON contributors. The RON loss during the hydrotreating process of FCC gasoline is mainly owing to olefin hydrogenation (HYDO) into saturated hydrocarbons .…”