A hydrochloric acid oxidation catalyst oxidizes hydrochloric acid. The hydrochloric acid oxidation catalyst includes a carrier, and copper, an alkali metal, and a rare earth element that are carried by the carrier. A differential value of a spectrum obtained by differential thermal analysis of the hydrochloric acid oxidation catalyst is 0.035 V/sec or less relative to a baseline in the range of 290 to 400 C.

A hydrochloric acid oxidation catalyst oxidizes hydrochloric acid. The hydrochloric acid oxidation catalyst includes a carrier, and copper, an alkali metal, and a rare earth element that are carried by the carrier. A differential value of a spectrum obtained by differential thermal analysis of the hydrochloric acid oxidation catalyst is 0.035 V/sec or less relative to a baseline in the range of 290 to 400 C.

The present invention relates to a method for chlorination and dehydrogenation of ethane, comprising: mixing and reacting a low-melting-point metal chloride with C.sub.2H.sub.6, such that the low-melting-point metal chloride is reduced to a liquid-state low-melting-point metal, and the C.sub.2H.sub.6 is chlorinated and dehydrogenized to give a mixed gas containing HCl, C.sub.2H.sub.6, C.sub.2H.sub.4, C.sub.2H.sub.2 and C.sub.2H.sub.3Cl. In the method, the low-melting-point metal chloride is used as a raw material for chlorination and dehydrogenation, and the low-melting-point metal produced after the reaction is used as an intermediate medium. The method has the characteristics of simple process, low cost and high yield. Moreover, some acetylene and vinyl chloride can be produced as by-products at the same time when the ethylene is produced, by controlling the ratio of ethane to the chloride as desired in production.

A method for producing chlorine by oxidizing hydrogen chloride with oxygen in the presence of a catalyst, wherein the catalyst satisfies the following conditions (i) and (ii): (i) the BET specific surface area is from 1 to 250 m.sup.2/g; and (ii) the value of H/D, wherein H is the half width of the peak of a pore distribution curve as determined by a mercury intrusion method; and D is the average pore diameter, is from 0.6 to 1.5.

A method for producing chlorine by oxidizing hydrogen chloride with oxygen in the presence of a catalyst, wherein the catalyst satisfies the following conditions (i) and (ii): (i) the BET specific surface area is from 1 to 250 m.sup.2/g; and (ii) the value of H/D, wherein H is the half width of the peak of a pore distribution curve as determined by a mercury intrusion method; and D is the average pore diameter, is from 0.6 to 1.5.

The invention relates to a process for regenerating a hydrogen chloride oxidation catalyst comprising ruthenium oxide on a support material, which comprises the steps a) reduction of the catalyst in a gas stream comprising hydrogen chloride and optionally an inert gas at a temperature of from 100 to 800 C., b) recalcination of the catalyst in an oxygen-comprising gas stream at a temperature of from 150 to 800 C.

The invention relates to a process for regenerating a hydrogen chloride oxidation catalyst comprising ruthenium oxide on a support material, which comprises the steps a) reduction of the catalyst in a gas stream comprising hydrogen chloride and optionally an inert gas at a temperature of from 100 to 800 C., b) recalcination of the catalyst in an oxygen-comprising gas stream at a temperature of from 150 to 800 C.

A process for the production of chlorine by thermo-catalytic gas phase oxidation of hydrogen chloride and oxygen is described, the process comprising at least (1) a cerium oxide catalyst and (2) an adiabatic reaction cascade, containing at least two adiabatic stages connected in series with intermediate cooling, wherein the molar O.sub.2/HCl-ratio is equal or above 0.75 in any part of the cerium oxide catalyst beds.

The present invention relates to a catalyst for obtaining chlorine (Cl.sub.2) through an oxidation reaction of hydrogen chloride (HCl), and more particularly, to an oxidation reaction catalyst for preparing Cl.sub.2 from HCl by addition of a second heterogeneous material to a RuO.sub.2-supported catalyst using TiO.sub.2 as a support, and a preparation method therefor. According to an embodiment of the present invention, a hydrogen chloride oxidation reaction catalyst for use in a method for preparing chlorine by oxidizing hydrogen chloride includes a support and a heterogeneous material in an active ingredient. The catalyst according to the present invention has both increased catalytic activity at a low temperature and enhanced thermal stability, and thus a catalyst having improved durability such as thermal stability at a high temperature is provided. Therefore, since thermal stability is secured, the performance of the catalyst is maintained for a long time even at a high temperature.

The present invention relates to a catalyst for obtaining chlorine (Cl.sub.2) through an oxidation reaction of hydrogen chloride (HCl), and more particularly, to an oxidation reaction catalyst for preparing Cl.sub.2 from HCl by addition of a second heterogeneous material to a RuO.sub.2-supported catalyst using TiO.sub.2 as a support, and a preparation method therefor. According to an embodiment of the present invention, a hydrogen chloride oxidation reaction catalyst for use in a method for preparing chlorine by oxidizing hydrogen chloride includes a support and a heterogeneous material in an active ingredient. The catalyst according to the present invention has both increased catalytic activity at a low temperature and enhanced thermal stability, and thus a catalyst having improved durability such as thermal stability at a high temperature is provided. Therefore, since thermal stability is secured, the performance of the catalyst is maintained for a long time even at a high temperature.