The present invention relates to a photocatalytic concrete product and a method to produce a photocatalytic concrete product. In first aspect the invention relates to method of producing photocatalytic concrete product, said concrete product being photocatalytic by containing nano sized photocatalytic particles embedded in an section including a first surface, said first surface forming an exterior surface when the photocatalytic concrete product is used as cover/lining. The method comprises: providing a not-yet-set concrete product having a first surface, applying a dispersion containing nano sized photocatalytic particles, such as titanium dioxide nanoparticles a solvent including a humectant onto said first surface of the not-yet-set concrete product.

A method of utilizing a catalyst for the sterilization, disinfection and purification of indoor air. The catalyst carrier is made of inorganic porous material such as Silica, Zeolite, Diatomite, Sepiolite, Montmoroillonite, and Aluminum oxide. The catalyst carrier can also be made of Cordierite, or Mullite ceramic honeycomb. After dipping into stabilized sodium hypochlorite solution or stabilized chlorine dioxide solution, the catalyst is produced after dehydration. The catalyst is irradiated with ultraviolet lamp to generate gas-phase free radicals including reactive particles such as .OH, .ClO2, .HO2, .O, thereby sterilizing microbial air pollutants such as viruses, bacteria, fungi and other microorganisms, and remove chemical air pollutants such as formaldehyde.

The present invention relates to an electrification unit and an electrostatic precipitator comprising same. The electrification unit includes: an electrification frame having a through-hole formed to pass through both surfaces thereof in a direction in which air including dust particles flows; a counter electrode coupled to the electrification frame; and a discharge electrode coupled to the electrification frame and causing corona discharge with respect to the counter electrode, wherein a catalyst layer capable of decomposing or removing ozone is coated on a surface of the counter electrode to decompose, reduce and remove ozone generated by corona discharge, and decompose and remove harmful gas.

The integrated device for adsorptive purification and catalytic regeneration of VOCs is provided and includes a filtration adsorption coupling filter, a catalytic combustion regeneration box and a housing, where the housing includes a filter inner cavity and a combustion inner cavity that are communicated in sequence. The VOC exhaust gas is adsorbed and filtered by the filtration adsorption coupling filter. Moreover, under an operating condition of desorption regeneration, the catalytic combustion regeneration box is utilized to perform thermal desorption and regeneration on the filtration adsorption coupling filter, and catalytically combust and purify the VOC exhaust gas obtained by thermal desorption.

An oven of this disclosure includes a heated catalyst assembly that reduces emissions during cooking cycles and, in particular, during air frying. The heated catalyst assembly resides between the cooking chamber and its exhaust vent and includes a thermal radiation source including at least one looped element, a first catalyst located toward the inlet in proximity to one side of the thermal radiation source and a second catalyst located in proximity to an opposite side of the thermal radiation heat source. The first and second catalysts are arranged in planes parallel to that of the thermal radiation heat source. The heated catalyst assembly reduces emissions of volatile organics to no greater than 6 ppm.

A composition of formula

Ce.sub.1-a-b-cN.sub.aM.sub.bD.sub.cO.sub.xI

wherein M stands for one or more elements from the group of alkaline metals, except sodium, N is Bi and/or Sb, D is present, or is not present, and if present is selected from one or more of Mg, Ca, Sr, Ba; Y, La, Pr, Nd, Sm, Gd, Er; Fe, Zr, Nb, Al; a is a number within the range of 0<a0.9, b is a number within the range of 0<b0.3, c is a number within the range of 0<c0.2, a plus b plus c is <1, and x is a number within the range of 1.2x2, and its use for exhaust gas aftertreatment systems of Diesel engines, gasoline combustion engines, lean burn engines and power plants.

Systems and methods for removal of gas phase contaminants may utilize catalytic oxidation. For example, a method may include passing a gas that includes a gas phase contaminant through a catalytic membrane reactor at a temperature of about 150 C. to about 300 C., wherein the catalytic membrane reactor includes a bundle of tubular inorganic membranes, wherein each of the tubular inorganic membranes comprise a macroporous tubular substrate with an oxidative catalyst and a microporous layer disposed on a bore side of the macroporous tubular substrate, and wherein at least about 50% of the gas flows through the tubular inorganic membranes in a Knudsen flow regime; and oxidizing at least some of the gas phase contaminant with the oxidative catalyst layer, thereby reducing a concentration of the gas phase contaminant in the gas.

Disclosed is an apparatus for decomposing low-concentration volatile organic compounds, which includes: an adsorption unit configured to adsorb a volatile organic compound; a heated air supply unit configured to supply a heated air to the adsorption unit; an oxidation decomposing catalyst unit configured to decompose a volatile organic compound detached from the adsorption unit; and an ozone supply unit configured to supply an ozone to the oxidation decomposing catalyst unit. The apparatus may maximize an exchange cycle semi-permanently by adsorbing low-concentration VOC under a high-flow condition and then detaching VOC within a short time and also by recycling an adsorption filter. In addition, the apparatus may effectively decompose VOC substances detached by a low flow into carbon dioxide and water under a condition with most excellent oxidation decomposition efficiency by using an oxidation decomposing catalyst filter.

One disclosed system includes: (a) a fan directing an initial air stream to a heater with sufficient heating capacity to heat said initial airstream to a temperature of 200 C. to 350 C. and output a heated air stream; and (b) an air to air heat exchanger positioned and configured to use said heated air stream to preheat said initial airstream prior to its arrival at said heater. Additional systems and corresponding methods are disclosed.

A catalytically active material is provided. The material includes a mixed oxide having a first metal selected from group 4 of the periodic table of elements and/or a second metal, and at least one further metal selected from group 11 of the periodic table of elements, wherein the macroscopic composition of the material given by the chemical formula corresponds to the composition of the material at a molecular level. A coating made of such a material is also provide, as is an article having such a coating, and a method for producing such a material.