An efficient Cu-K-La/γ-Al2O3 catalyst for catalytic oxidation of hydrogen chloride to chlorine

Shape-Controlled CeO2 Nanoparticles: Stability and Activity in the Catalyzed HCl Oxidation Reaction

“…RuO 2 is not only scarce with a high and volatile price, but also RuO 2 may face stability problems by forming volatile RuO 4 at elevated temperatures that is encountered at “hot-spots” in the fixed-bed reactor during the Deacon process. Therefore, it would be desirable to find an alternative abundant and cost-effective catalyst material from an economical point of view. ,, A catalytic activity lower than that of RuO 2 would be tolerable as long as the catalytic activity of this new material can be increased by rising the reaction temperature without losing its stability.…”

Highly active and stable RuO2/MgF2 catalysts for efficient HCl oxidation in the fluorochemical industry

“…7,8 However, the industrialization of this reaction has been hampered by the difficulty to obtain sufficiently active and durable catalysts. [7][8][9][10][11][12][13][14][15] For example, the original Deacon catalyst, CuCl 2 /pumice, suffered from fast deactivation due to volatilization of copper in the form of chlorides, operational problems such as particle coagulation and severe corrosion of plant components. 9 Later processes based on CuCl 2 -KCl/ SiO 2 (Shell-Chlor) and Cr 2 O 3 /SiO 2 (Mitsui-Toatsu) were also abandoned due to their poor catalyst activities and short lifetimes.…”

“…10 Besides, some economic and robust alternatives, such as CeO 2 , CeO 2 -MnO x , U 3 O 8 , Ru 0.3 Ti 0.7 O 2 , and CuCrO 2 , turned out to be promising Deacon catalysts, since they were active and stable at elevated reaction temperatures. [11][12][13][14][15][16][17][18] In the last decade, a major breakthrough in the Deacon process has been achieved with the development of TiO 2 (rutile) or SnO 2 (cassiterite) supported RuO 2 catalysts, which have shown a high activity at a low temperature and a remarkable stability against chlorination and sintering of the active RuO 2 species on the supports. [19][20][21][22][23] However, these benchmark catalysts are easily deactivated in the catalytic oxidation of HCl with a small amount of HF, because their supports react with HF under the oxidation reaction conditions.…”

Study on Low-Temperature Catalytic Dehydrogenation Reaction of Tail Chlorine by Pd/Al2O3

“…Thus, many researchers concentrated on the recovery of chlorine from hydrogen chloride by catalytic oxidation. Han et al [1] made the conversion of hydrogen chloride to chlorine by catalytic oxidation in a two-zone circulating fluidized bed reactor at reaction temperature above 200 ∘ C. Feng et al [2] prepared an efficient Cu-K-La/ -Al 2 O 3 catalyst for catalytic oxidation of chlorine from hydrogen chloride and the results showed a good catalytic performance and stability of conversion. Given that, the explosion problem of containing hydrogen in tail chlorine cannot be easily solved by combustion of hydrogen and chlorine to synthesize hydrochloric acid.…”