Synthesis of Sulfur-Resistant TiO2-CeO2 Composite and Its Catalytic Performance in the Oxidation of a Soluble Organic Fraction from Diesel Exhaust

Abstract

Sulfur poisoning is one of the most important factors deteriorating the purification efficiency of diesel exhaust after-treatment system, thus improving the sulfur resistibility of catalysts is imperative. Herein, ceria oxygen storage material was introduced into a sulfur-resistant titania by a co-precipitation method, and the sulfur resistibility and catalytic activity of prepared TiO 2 -CeO 2 composite in the oxidation of diesel soluble organic fraction (SOF) were studied. Catalytic performance testing results show that the CeO 2 modification significantly improves the catalytic SOF purification efficiency of TiO 2 -CeO 2 catalyst. SO 2 uptake and energy-dispersive X-ray (EDX) results suggest that the ceria doping does not debase the excellent sulfur resistibility of bare TiO 2 , the prepared TiO 2 -CeO 2 catalyst exhibits obviously better sulfur resistibility than the CeO 2 and commercial CeO 2 -ZrO 2 -Al 2 O 3 . X-ray powder diffraction (XRD) and Raman spectra indicate that cerium ions can enter into the TiO 2 lattice and not form complete CeO 2 crystals. X-ray photoelectron spectroscopy (XPS), H 2 -temperature programmed reduction (H 2 -TPR) and oxygen storage capacity (OSC) testing results imply that the addition of CeO 2 in TiO 2 -CeO 2 catalyst can significantly enhance the surface oxygen concentration and oxygen storage capacity of TiO 2 -CeO 2 .

Preparation of CexZr1–xO2 by Different Methods and Its Catalytic Oxidation Activity for Diesel Soot

“…The results are shown in Figure 8 . The multiple reduction peaks at 340–550 °C can be seen as a result of the step-by-step reduction of lattice oxygen on the surface of the catalyst, 34 while the reduction peak at approximately 770 °C can be attributed to the reduction of lattice oxygen in the bulk phase of the catalyst. When the temperature is above 600 °C, soot can be actively burned under aerobic conditions.…”

Tailoring Cadmium Composition on Titanium Dioxide to Achieve Enhanced Photocatalytic Glucose Fuel Cell Anode Performance

“…This value range was observed by many researchers. 39,40 When the Cd metal is added, it increases its reducibility of TiO 2 ; hence, the reduction temperature decreases. As seen in Figure 6a, as the amount of Cd increases, the reducing temperature decreases, and the reducibility increases.…”

Cerium-Doped TiO2 and Sepiolite Nanocomposites for Tetracycline Inactivation in Water Treatment

“…47 Moreover, the coexistence of Ce 3+ and Ce 4+ species is known to enhance the photocatalytic performance in Ce−Ti systems, and it is associated with electron transfer properties that promote the efficient separation of photogenerated charge carriers. 48 It could suggest that Ce is homogeneous and dispersed in the material. Similarly, the Mg/Si relative atomic ratio did not show significant changes with Ce addition, indicating that Ce is not interacting with Mg, as deduced from Mg 2p binding energies for all the samples.…”