Organic sulfur compounds contained in refinery off gas streams having either high ort low concentrations of olefins are converted to hydrogen sulfides which can be then be removed using conventional amine treating systems. The process uses a catalytic reactor with or without a hydrotreater depending on the olefin concentration of the off gas stream. The catalytic reactor operates in a hydrogenation mode or an oxidation mode to convert a majority of organic sulfur compounds into hydrogen sulfides.

Disclosed in the present invention are a device system and method having sintering flue gas CO catalytic heat exchange and medium-and-low-temperature SCR denitration connected in series. In the device system, a CO catalytic heat storage and exchange device is arranged to completely replace an original heat exchanger arranged after a raw desulfurized flue gas pipe. The method comprises respectively carrying out first CO catalytic conversion and second CO catalytic conversion on sintering flue gas and denitrated flue gas by means of the CO catalytic heat storage and exchange device, thereby increasing CO conversion efficiency and reducing overall resistance of the system. In addition, the present invention takes both CO pollution control and carbon emission reduction into consideration and thus has good economic benefits and a good application prospect.

A hydrocarbon production system includes: an impurity removal device that removes an impurity including any one or both of oxygen and a sulfur component from a mixed gas containing the impurity and carbon dioxide; a hydrocarbon production device, which includes a hydrocarbon synthesis catalyst for promoting a reaction for synthesizing hydrocarbon from carbon dioxide and hydrogen and synthesizes the hydrocarbon from the carbon dioxide contained in the mixed gas having the impurity removed by the impurity removal device and hydrogen; and a heat supply unit that supplies reaction heat generated in the hydrocarbon production device to the impurity removal device.

A method is provided for removing hydrogen sulfide from a gas or liquid stream containing hydrogen sulfide, the method comprises reacting the hydrogen sulfide in the gas or liquid stream in a reactor containing a mixture of iodine, water and hydriodic acid, under low temperature conditions, to thereby remove the hydrogen sulfide; and then regenerating the iodine in the liquid phase under conditions below the boiling point or vaporization of the mixture.

A gas treatment system includes a first scrubber, a regenerative catalytic oxidizer (RCO) that treats gas that passes through the first scrubber, a second scrubber that treats the gas that passed through the regenerative catalytic oxidizer, and a dielectric barrier discharge (DBD) plasma reactor that treats the gas that passed through the second scrubber. The regenerative catalytic oxidizer includes a two-bed regenerative catalytic reactor.

Provided is an exhaust gas treatment method where chlorine gas and a perfluoro compound can be decomposed in exhaust gas containing the chlorine gas and the perfluoro compound to reduce both a concentration of the chlorine gas and a concentration of the perfluoro compound in the gas. The method of treating exhaust gas containing chlorine gas and a perfluoro compound includes: a chlorine gas decomposition step of causing the chlorine gas in the exhaust gas to react with water to be decomposed in the presence of a chlorine gas decomposition catalyst; a hydrogen chloride removal step of removing hydrogen chloride from the gas having passed through the chlorine gas decomposition step; and a perfluoro compound decomposition step of causing the perfluoro compound in the gas having passed through the hydrogen chloride removal step to react to be decomposed in the presence of a perfluoro compound decomposition catalyst.

A method for cleaning gas flows generated by a combustion process. In one where continued use of coal as a source of heat input embodiment, this is accomplished by a multi-stage gas flow treatment that comprises treatment of a gas flow with ozone as a reactant to oxidize nitrous oxide and convert mercury to its oxidized form. This is followed by exposing the gas flow to one or more stages of a wet electrostatic precipitator (ESP) to substantially remove water and particulate matter from the gas flow. Among other benefits, the disclosed treatment process assists States to comply with regional haze reduction rules and regulations.

The present invention relates in a first aspect to a catalytic composition comprising a catalytic mixture in a powdered state of a first catalyst having photo catalytic activity, a second catalyst being a low temperature catalyst and an adsorbent, whereby the catalytic composition comprises carbon nanotubes in an amount of at most 5 weight-% based on the amount of the catalytic mixture. Further, the present invention relates to a method for producing said catalytic composition according to the present invention. In addition, a catalytic device comprising the catalytic composition according to the present invention, optionally coated on a carrier is provided as well as a gas depolluting apparatus containing said catalytic composition according to the present invention or the catalytic device accordingly. Finally, the use of the catalytic composition or the catalytic device as well as the gas depollution apparatus is disclosed, in particular, for depollution of gases of volatile chemical contaminants as well as treatment of gas containing biological contaminants.

A method for gas treatment and purification, comprising: generating ozone from a supply of gas comprising an oxygen (O.sub.2) gas in presence of a defined voltage; oxidizing the ozone (O.sub.3), in an oxidization chamber, in presence of light of a pre-defined wavelength and at least one oxidation catalyst to generate a reactive oxygen species (ROS); feeding, in a first reactive space, the generated ROS and water from a water tank to generate the ROS comprising hydroxyl radicals; and supplying, in a second reactive space, the ROS comprising the hydroxyl radicals and a feed gas that comprises one or more contaminants to produce a first treated gas, wherein the first treated gas is produced from the reaction of the feed gas with the ROS comprising the hydroxyl radicals.

A system and a process for reducing greenhouse gas emissions are disclosed herein. The system may include a combustion zone, a catalytic converter, a methanation reactor, a compressor, a normal venting unit, a vacuum protection unit, and a control system. The process may include feeding a fuel, a methane-containing gas, and an oxygen-containing gas into a first reactor unit, and producing a combustion products stream comprising carbon monoxide, carbon dioxide, and water. The process may include cooling the combustion products stream via a cooling system, feeding the cooled exhaust stream and hydrogen to a second reactor unit. The second reactor unit may include a first catalyst for reacting oxygen with carbon monoxide to form carbon dioxide, and a second catalyst for reacting carbon dioxide with hydrogen to produce methane. The process may include recovering an effluent from the second reactor unit and feeding it to the first reactor unit.