A catalyst for decomposing an organic substance, the catalyst having a body which has a plurality of pores and the body contains a perovskite-type composite oxide represented by A.sub.xB.sub.yM.sub.zO.sub.w, where the A contains at least one selected from Ba and Sr, the B contains Zr, the M is at least one selected from Mn, Co, Ni, and Fe, 1.001≤x≤1.1, 0.05≤z≤0.2, y+z=1, and w is a positive value that satisfies electrical neutrality. The average pore diameter of the plurality of pores is 49 nm to 260 nm and the pore volume of each of the plurality of pores is 0.08 cm.sup.3/g to 0.37 cm.sup.3/g.

Disclosed herein are methods and systems for the removal of volatile organic compounds, carbon monoxide and nitrogen oxides from off-gas, which systems comprise a source of ammonia, means for introducing ammonia into a catalytic article having an SCR functionality; a catalytic article having both an oxidation and an SCR functionality, the catalytic article comprising a catalyst substrate and a catalyst composition comprising at least one platinum group metal and/or at least one platinum group metal oxide, at least one oxide of titanium and at least one oxide of vanadium, wherein the washcoat is located in and/or on the walls of the catalyst substrate: means for measuring the amount of NO.sub.x and/or the ammonia slip between the outlet end of the catalytic article and the stack or at the stack, at least one carbon monoxide source, and means for introducing carbon monoxide into the catalytic article.

A gas evacuation device for filtering a gas is provided. The gas evacuation device comprises a gas channel including a gas-channel inlet and a gas-channel outlet, a gas detection main body disposed in the gas channel near the gas-channel inlet for detecting the gas introduced through the gas-channel inlet and generating detection data, a gas guider for guiding the gas, and a driving controller for controlling enablement and disablement of the gas detection main body and the gas guider.

The present disclosure relates to a device that includes a filter element and a catalyst, where the filter element is configured to remove particulate from a stream that includes at least one of a gas and/or a vapor to form a filtered stream of the gas and/or the vapor, the catalyst is configured to receive the filtered stream and react a compound in the filtered stream to form an upgraded stream of the gas and/or the vapor, further including an upgraded compound, and both the filter element and the catalyst are configured to be substantially stable at temperatures up to about 500° C.

An indoor smoker includes a smoking chamber and an air handler for drawing a flow of smoke from the smoking chamber through an exhaust duct. A catalytic converter is positioned in the exhaust duct and includes a catalytic element and catalytic heater for heating the catalytic element to a temperature suitable for regulating emissions from the flow of smoke. A temperature sensor is used to monitor the temperature of the catalytic element, and smoke generation is stopped when the catalyst temperature drops below a temperature threshold or drops at a rate that exceeds a threshold rate, which may be indicative of a failure of the catalyst heater or air handler.

The present application provides a system for treating malodorous gas from sludge, which includes an air compressor, a first pressure swing adsorption tower, a second pressure swing adsorption tower, a buffer tank, a decomposition tank, an exhaust gas scrubber and a vacuum device. The present invention relates to a process for treating malodorous gas from sludge treatment, which includes: compressing the malodorous gas by using an air compressor, and adsorbing by using a pressure swing adsorbent. The air for removing the malodorous component is configured for sludge separation and aerobic aeration in the treatment tank. When the pressure swing adsorbent reaches the design upper limit value, the intake air is stopped, decompression and desorption start, and the enriched malodorous component is sent to catalytic combustion or photocatalytic decomposition, and then the acid gas in the tail gas is neutralized with an alkaline absorbent, and finally discharged to the standard.

Monolithic composite photocatalysts for fluid purification are disclosed. The monolithic composite photocatalysts comprise a photoactive nanocrystal component and a non-photoactive porous support. Photocatalytic fluid purification systems that contact an impurity-containing fluid with the subject monolithic composite photocatalysts are also disclosed. The monolithic composite photocatalysts may be affixed to or embedded in scaffold structures to promote fluid flow through a fluid purification system and contact with the monolithic composite photocatalysts.

A system comprising a housing; a filter retained within the housing; optionally, an activation mechanism configured to, during operation, activate the filter; and a flow controller configured to urge fluid through the filter.

A system and method for processing industrial waste gas based on a combination of photoelectrocatalysis and a biotrickling filter, including an industrial waste gas simulation generator, a photoelectrocatalytic reactor and at least one biotrickling filter. The industrial waste gas simulation device transports the industrial waste gas to the photoelectrocatalytic reactor through the buffer tank and the mixing tank by a fan. Then the industrial waste gas is degraded under the synergistic catalysis of the substances with high catalytic activity generated by the plasma reactor and the photocatalyst activated by the ultraviolet lamp.

Described herein are heterogeneous materials comprising a mixture of a first n-type semiconductor and a second n-type semiconductor. The first n-type semiconductor may be a single or plural phase TiO.sub.2 material. The second n-type semiconductor includes a metal titanate and/or a noble metal. Upon activation with ultraviolet light, the photocatalytic material mixtures described herein efficiently decompose volatile chemical compounds. Furthermore, the photocatalytic materials disclosed herein are observably more stable, relative to known semiconductor materials, to inactivation by deposition.