In a process for the removal of hydrogen chloride and/or sulfur oxides from a landfill gas stream, which contains impurities such as siloxanes, H.sub.2S, organic and inorganic sulfides and volatile organic compounds (VOCs), the heated gas is passed through a siloxane removal bed, where siloxanes are absorbed and then through one or more sulfur removal beds, where hydrogen sulfide and/or organic sulfides are absorbed. The effluent is passed through a reactor containing an oxidation catalyst enabling catalytic oxidation of VOCs, organic and inorganic CI- and/or S-containing compounds, COS and CS.sub.2 to their respective combustion products, and finally the effluent from the reactor is passed through one or more beds, where hydrogen chloride and/or sulfur oxides are absorbed.

The invention relates to a device for measuring, in near-real-time, the level of black carbon, brown carbon, organic carbon, total carbon and CO.sub.2 in air. The device also provides for a direct calculation of aerosol angstrom coefficient as well as estimation of emissions rates of black carbon or brown carbon from nearby combustion sources.

The present invention provides a coating composition suitable for use in forming a coating that can reduce a concentration of pollutant gases in the environment. The coating composition includes from 0.01 to 10 vol.-% of mesoporous titania particles, relative to a total volume of the coating composition, and from 5 to 99.99 vol.-% of a polymeric material, relative to the total volume of the coating composition. The mesoporous titania particles have a continuous exterior convex surface, a particle diameter of ?1 ?m but ? to 50 ?m, a BET specific surface area of from 30 to 350 m.sup.2/g, a modal pore diameter of ?5 nm but ?50 nm, and a pore size distribution so that 85% or more of a total pore volume is associated with pores having a diameter of 10 ?m or less.

The present invention relates to a catalyst comprising a macroporous noble metal-containing zeolite material and a porous SiO.sub.2-containing binder, wherein the catalyst has a proportion of micropores of more than 70%, based on the total pore volume of the catalyst. The invention is additionally directed to a process for preparing the catalyst and to the use of the catalyst as an oxidation catalyst.

An apparatus (10) for production of water from atmospheric air comprises a condensation unit (20) comprising: an inlet opening (21) of the moist air with a dew point of lower than 0 C., an outlet opening (22) of the dehumidified air, at least a ventilator (23) configured so as to force an air flow and enter through the inlet opening (21) and exit from the outlet opening (22), a heat exchange plate (24), interposed between the inlet opening (21) and the outlet opening (22), so as to intercept the air flow and able to be crossed by the air flow, in which a refrigerating fluid of a refrigerating unit (30) circulates at a lower temperature than a dew point temperature of the air flow and at least a heating element configured so as to heat the heat exchange plate (24) for defrosting the ice condensed thereon.

A method of synthesizing an Au(TiO.sub.2-y/WO.sub.3-x) semiconductor composite, the method comprising: loading tungsten oxide (WO.sub.3) powder in a fluidized bed reactor followed by H.sub.2 treatment to produce reduced tungsten oxide (WO.sub.3) nanoparticles or WO.sub.3-x nanoparticles; producing reduced titanium dioxide (TiO.sub.2) nanoparticles or TiO.sub.2-y (containing defect states) nanoparticles in-situ; coupling the TiO.sub.2-y nanoparticles with the WO.sub.3-x nanoparticles to provide a titanium dioxide/tungsten oxide nanocomposite (TiO.sub.2-y/WO.sub.3-x); and simultaneous substitutional doping of TiO.sub.2-y and WO.sub.3-x in the titanium dioxide/tungsten oxide nanocomposite (TiO.sub.2-y/WO.sub.3-x) with gold ions (Au) to obtain the Au(TiO.sub.2-y/WO.sub.3-x) semiconductor composite; wherein x has a value between 0.33 and 0.37. The thus produced composite can be used as a photocatalyst.

The present invention relates to a method for the treatment of an exhaust gas comprising carbon monoxide (CO) and/or one or more volatile organic compounds (VOCs) using a PGM-free catalyst article comprising a mixed oxide of Mn, Cu, Mg, Al and La. The present invention also relates to an HVAC system comprising a PGM-free catalyst article.

A built-in apparatus and method for treating air including a housing with an air inlet and an air outlet. An air mover positioned near the air outlet is configured to draw the air through the air inlet. The housing encloses an air treatment zone, such as including an oxidizing zone, and an ozone removal zone positioned downstream of the air treatment zone and oxidizing zone. The air treatment zone includes UV light and/or ozone that partially oxidizes the chemical contaminants in the air treatment zone. A catalyst in the oxidizing zone oxidizes elements within the air treatment zone. The ozone removal zone includes a second, different catalyst material. A UV bulb that may or may not generate ozone is positioned within or downstream of the first and/or second catalyst materials to assist catalyst oxidation and/or self-clean the apparatus.

An ozone cleaning system includes a first chamber, a second chamber coupled to the first chamber, and a utility assembly disposed within the second chamber. The utility assembly includes an ozone generator configured to provide ozone to the first chamber, a humidifying unit configured to provide water vapor to the first chamber, and a blower configured to at least one of (i) reduce air pressure within the first chamber or (ii) draw the ozone from the first chamber following a decontamination process.

A process for the cleaning of a lean gas stream contaminated with volatile organic compounds (VOCs) and/or sulfur-containing compounds comprises the steps of adding ozone to the contaminated lean gas stream, subjecting the ozone-containing lean gas stream to ultraviolet irradiation, thereby transforming VOCs to particles, maintaining the irradiated gas stream in a stay zone for a sufficient time to allow aerosol particle growth, and passing the gas stream through a catalytic bag filter at a temperature down to room temperature to remove the formed particles and eliminate any remaining ozone. The bag filter has been made catalytic by impregnation with one or more metal oxides in which the metals are selected from V, W, Pd and Pt, supported on TiO.sub.2.