Influence of the structure of TiO2, CeO2, and CeO2-TiO2 supports on the activity of Ru catalysts in the catalytic wet air oxidation of acetic acid

Abstract

Ru catalysts, supported on TiO 2 , CeO 2 , and CeO 2 -TiO 2 , were prepared by the impregnation method. The effect of the structure of the supports on the activity of Ru catalysts was investigated in the catalytic wet air oxidation (CWAO) of acetic acid under 230°C and 5 MPa in a batch reactor. Physical properties including the surface area, crystalline phase, and surface components of the Ru catalysts were characterized by N 2 adsorption, X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The CeO 2 -based Ru catalysts had good activity, and the prepared RuO 2 /CeO 2 catalyst showed markedly higher activity than the RuO 2 /CeO 2 -TiO 2 catalyst. The surface structure, the high amount of chemisorbed oxygen on the catalyst surface, and the suitable pH pzc value of the supports played an important role in the activity of the Ru catalysts in CWAO of acetic acid.

Effect of Ce/Ti ratio on the catalytic activity and stability of Ni/CeO2–TiO2 catalyst for dry reforming of methane

“…Incorporation of Ti 4+ into the CeO 2 lattice and formation of Ce-O-Ti solid solution have been well established [32,33]. The Ti 4+ is smaller than Ce 4+ , so that Ce 4+ is capable of partial substitution by Ti 4+ in the Ce-Ti support system.…”

Impact of cerium-based support oxides in catalytic wet air oxidation: Conflicting role of redox and acid–base properties

“…Various supported metal catalysts were investigated in CWAO of aqueous solutions of CH 3 COOH: Ru/carbon [60], Ru/Al 2 O 3 [61], Ru/CeO 2 [62], Ru/TiO 2 [63], Ru/CeO 2 -TiO 2 [64], Pt or Ru over TiO 2 or ZrO 2 [65], Pt/carbon [66], Au/CeO 2 [67]. The performances of nine different supported metal catalysts in CWAO of acetic acid were investigated by Barbier et al [68].…”

“…CeO 2 -TiO 2 mixed oxides with different composition were successfully tested for the CWAO of acetic acid and phenol [64,88,89]. It has been demonstrated that the optimal atomic ratio Ce/Ti is equal to 1.…”

Occurrence and Distribution of Synthetic Organic Substances in Boreal Coniferous Forest Soils Fertilized with Hygienized Municipal Sewage Sludge

“…CeO 2 is also used as an additive or a promoter in commercial applications such as fluid catalytic cracking, ammoxidation and dehydrogenation processes [33][34][35][36][37]. Moreover, in the last years several ceriabased catalysts were investigated for CWAO (catalytic wet air oxidation) [38][39][40] and CWOP (catalytic wet peroxide oxidation) [41][42][43][44] techniques. The main purpose of this work is to investigate doped ceria materials in the treatment of landfill leachate by a heterogeneous Fenton process.…”