Cr_xTi_1-x oxide catalysts prepared by a sol–gel process were investigated in catalytic combustion of 1,2-dichloroethane, vinyl chloride, chlorobenzene, 1,2-dichlorobenzene, and trichloroethylene. FT-IR spectra on Cr_0.1Ti_0.9 showed that 1,2-dichloroethane, vinyl chloride, and chlorobenzene adsorbed through the hydrogen bond between TiOH and Cl atoms and then interacted with surface Cr⁶⁺=O in Cr₂O₇²⁻ species to form a reactive enolic species, which was further oxidized with surface oxygen. The activity was greatly dependent on Cr⁶⁺ as both a strong Lewis acid and reducible sites. TOF_Cr⁶⁺ at 200 °C was 0.59–1.12 × 10⁻³ s⁻¹. Chlorination products were not observed with the conversion approaching completion below 300 °C. The activity on a stream feed containing 1000 ppm reactants at 245 and 285 °C was maintained for at least 100 h. The formation of Cr-O-Ti effectively inhibited the escape of Cr as Cl₂CrO₂. It was confirmed by physically closed contact of Cr₂O₃ and TiO₂ that a synergism between Cr⁶⁺ and Ti-OH was responsible for the high activity and stability of Cr_xTi_1-x catalysts.

通过溶胶-凝胶法制备的Cr _x Ti _{1- x}氧化物催化剂在1,2-二氯乙烷，氯乙烯，氯苯，1,2-二氯苯和三氯乙烯的催化燃烧中进行了研究。在Cr _0.1 Ti _0.9上的FT-IR光谱表明，1,2-二氯乙烷，氯乙烯和氯苯通过Ti OH和Cl原子之间的氢键吸附，然后与Cr ₂ O ₇ ^2-中的Cr ⁶⁺ = O相互作用形成反应性烯醇型物质，然后被表面氧进一步氧化。作为强路易斯酸和可还原位点，活性很大程度上取决于Cr ⁶⁺。到F200°C下的_Cr ⁶⁺为0.59–1.12×10 ^-3 s ^-1。在300℃以下，转化率接近完全，未观察到氯化产物。将含有1000 ppm反应物的物流进料在245和285°C下的活性维持至少100小时。Cr-O-Ti的形成有效地抑制了Cr作为Cl ₂ CrO ₂的逸出。通过Cr ₂ O ₃和TiO ₂的物理闭合接触证实，Cr ⁶⁺和Ti-OH之间的协同作用是Cr _x Ti _{1- x}催化剂的高活性和稳定性的原因。