Construction of Superhydrophobic Ru/TiCeO_x Catalysts for the Enhanced Water Resistance of o-Dichlorobenzene Catalytic Combustion

Abstract

In this paper, a simple method to enhance the H 2 O resistance of Ru/TiCeO x catalysts for o-DCB catalytic combustion by constructing superhydrophobic coating of phenyltriethoxysilane (PhTES) was proposed. The effect of PhTES content on the pore structure, specific surface area, H 2 O resistance, contact angle (CA) value, and catalytic activity of the catalyst was studied. When water was added, the pristine Ru/TiCeO x catalytic activity decreased by about 26%, while the Ru/TiCeO x -16Ph activity hardly decreased. According to the analysis results of XRD, FT-IR, SEM, and CA, PhTES was closely coated on the surface of Ru/TiCeO x to produce a more hydrophobic surface. The Ru/TiCeO x -16Ph catalyst had strong hydrophobicity, and the contact angle was 159.8°, which not only significantly enhanced the water resistance and self-cleaning activity but also showed a good elimination temperature (T 90 = 341 °C) for the o-DCB. The enhanced water resistance of Ru/TiCeO x -XPh catalysts resulted from the reduction of the active centers consumed (water occupying oxygen vacancy sites). The reaction mechanism of the Ru/TiCeO x -16Ph catalyst based on surface oxygen species and the Deacon reaction was proposed. This method provided new idea for the design of a new water-resistant composite catalyst and promoted the practical application of the composite catalyst in the catalytic oxidation of o-DCB.

Atomically dispersed Ru catalysts for polychlorinated aromatic hydrocarbon oxidation

“…11 In detail, supported Ru-based catalysts by various metal oxides such as CeO 2 , 6,9 TiSn oxides 12 or Co 3 O 4 13 were prepared and applied for PCAH oxidation, and they all showed relatively good oxidation activity with T 90% (the temperature with 90% conversion) ranging from 260 to 300 °C, along with good anti-chlorine stability as Ru could remove chloride species through a Deacon reaction. 11,12,14 However, the current work generally used high Ru loading (mostly 1 wt%), 11,12 and reducing the Ru loading, for instance to 0.3 wt%, usually resulted in decreased catalytic activity with T 90% > 300 °C. 14 Therefore, we expect to develop a catalyst which possesses not only low Ru loading ( e.g.…”

“…11,12,14 However, the current work generally used high Ru loading (mostly 1 wt%), 11,12 and reducing the Ru loading, for instance to 0.3 wt%, usually resulted in decreased catalytic activity with T 90% > 300 °C. 14 Therefore, we expect to develop a catalyst which possesses not only low Ru loading ( e.g. , <0.5 wt%) but also good low-temperature catalytic activity ( T 90% < 300 °C) for PCAH oxidation.…”

“…8), compared with the 233 °C in 0.2 Ru ADCs. The fact that Ru ADCs showed better catalytic activity in chlorinated aromatic oxidation than Pt/Pd ADCs could be partially explained by the inhibition of chlorinated intermediates due to the Deacon reaction, 11,12,14 while the intermediates on Pd or Pt-based catalysts were prone to be chlorinated during the oxidative removal of chlorinated aromatics. 5,7 The spent 0.2 Ru ADCs was investigated by XRD (Fig.…”

Fabrication of a multi-dimensional CoFeOx catalyst for the efficient catalytic oxidation elimination of o-dichlorobenzene

“…Hence, the catalytic combustion reaction of o-DCB is usually considered a primary reaction. 6,8 The calculated activation energies (E a ) of the 2D/1D TOFs refer to the number of conversions per unit time for a single active site. The TOFs value can measure the catalytic reaction rate and intrinsic activity of the catalyst.…”

“…Appropriate use and control are important to the release of CVOCs, so complete elimination and destruction of volatile organic compounds in exhaust gases are necessary. 5,6 Catalytic combustion of CVOCs is a low-cost and high-efficiency method to convert CVOCs into H 2 O, HCl and CO 2 . Due to the high removal efficiency of catalytic combustion technology, it has been widely used in the field of exhaust gas treatment, and even traces of CVOCs can be eliminated completely at low temperatures (o500 1C).…”