| 摘要 |
<p>A process for the efficient production of Cl2 from gaseous HCl, using a catalyst (1) containing a transition metal oxide, an alkali metal chloride, and, optionally, a trivalent rare earth chloride, operates efficiently at moderate temperatures and without volatilization of the catalyst (10). The process comprises two steps: 1) a chloridizing step in which the HCl is contacted with the catalyst (1) at an elevated temperature, converting the transition metal oxide to a transition metal chloride with elimination of water; and 2) an oxidizing step in which the transition metal chloride produced in the first step is contacted with a source of oxygen at a temperature at least about 300 °C but less than 400 °C and sufficiently high that Cl2 is envolved and the transition metal chloride is reconverted to a transitional metal oxide. The temperature of the oxidizing step is increased over that of the chloridizing step. Preferably, the transition metal oxide is MnO2, in which case the MnO2 is converted to MnCl2 in the first step with the release of Cl2. The transition metal oxide can also be Co2O3, Co3O4, Cr2O3, NiO, Ni2O3, Mo2O3, or CuO.</p> |
