Abstract
A hydrocalumite-type material (HC) was synthesized by the co-precipitation method, mixing Ca and Al nitrate solutions in a NaOH solution (pH ≅ 11). This solid was characterized by using different physico-chemical techniques such as: Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), temperature programmed reduction (TPR) and BET surface area measurements. Then, a portion of as-synthesized solid was calcined at 420 oC (HC 420). Both calcined and pristine solids were impregnated with Mo (15% w/w as MoO3). Ni or Co was also impregnated on Mo/HC or Mo/HC 420 in 1(Co or Ni):3 (Mo) atomic ratios to get catalytic precursors. These solids were also characterized by the above mentioned techniques. Catalytic precursors were tested in the thiophene hydrodesulfuration reaction at 280 oC and atmospheric pressure. Cobalt promoted catalysts were more active than those promoted with Ni. However, thiophene conversions were lower than that of a conventional CoMo/γ-Al2O3 catalyst.
Highlights
Hydrotreatment (HDT) is often used for reducing heteroatoms and aromatics contents from fossil fuels
Hydrotalcite-type materials, whose structure is similar to hydrocalumite-types, have been studied as HDT catalyst supports, especially, those synthesized with Al and Mg4,5; Ca-Al hydrocalumite-type solids have not been documented for this purpose
This paper explores the hydrocalumite as support of CoMo or NiMo oxides for use in the HDS reaction of thiophene
Summary
Hydrotreatment (HDT) is often used for reducing heteroatoms and aromatics contents from fossil fuels. HDT catalysts play a very important role, both in refining technology and for environment protection. Effectiveness of these catalysts minimizes costs of production of clean combustibles[1,2]. A possibility to produce better catalysts is the use of new supports which should render more active and cheaper catalysts than those currently employed[3]. In this way, hydrotalcite-type materials, whose structure is similar to hydrocalumite-types, have been studied as HDT catalyst supports, especially, those synthesized with Al and Mg4,5; Ca-Al hydrocalumite-type solids have not been documented for this purpose.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call