Methods and systems for treating volatile organic compounds (VOCs) generated in a hydrocarbon treating process are disclosed. An effluent stream containing the VOCs, as well as carbon dioxide (CO.sub.2) is combined with hot exhaust gas from a turbine and provided to a waste heat recovery unit (WHRU). The WHRU is adapted to contain a catalyst bed containing oxidation catalyst capable of effecting the oxidation of the VOCs. The temperature of the catalyzing reaction can be tailored based on the position of the catalyst bed within the temperature gradient of the WHRU. The methods and systems described herein solve the problem of effecting the removal of VOCs from the effluent. Heating the CO.sub.2-containing effluent in the WHRU also lend buoyancy to the effluent, thereby facilitating its dispersal upon release.

The present invention relates to a diesel oxidation catalyst comprising a substrate and a wash-coat comprising a first layer and a second layer, wherein the substrate has a substrate length, a front end and a rear end, the washcoat comprising the first layer comprising a first metal oxide and comprising a platinum group metal supported on a metal oxide support material; the second layer comprising a second metal oxide and comprising one or more of an oxidic compound of vanadium, an oxidic compound of tungsten and a zeolitic material comprising one or more of Fe and Cu; wherein the first layer is at least partially disposed directly on the substrate, or is at least partially disposed directly on an intermediate layer which is disposed directly on the substrate over the entire length of the substrate, on x % of the length of the substrate from the front end of the substrate, and wherein the second layer is at least partially disposed directly on the substrate, or is at least partially disposed directly on the intermediate layer which is disposed directly on the substrate over the entire length of the substrate, on y % of the length of the substrate from the rear end of the substrate, wherein x is in the range of from 25 to 75 and y is in the range of from 25 to 75 and wherein x+y is in the range of from 95 to 105, wherein the intermediate layer comprises alumina.

The moisture-resistant catalyst for air pollution remediation is a catalyst with moisture-resistant properties, and which is used for removing nitrogen compound pollutants, such as ammonia (NH.sub.3), from air. The moisture-resistant catalyst for air pollution remediation includes at least one metal oxide catalyst, at least one inorganic oxide support for supporting the at least one metal oxide catalyst, and a porous framework for immobilizing the at least one metal oxide catalyst and the at least one inorganic oxide support, where the porous framework is moisture-resistant. As non-limiting examples, the at least one metal oxide catalyst may be supported on the at least one inorganic oxide support by precipitation, impregnation, dry milling, ion-exchange or combinations thereof. The at least one metal oxide catalyst supported on the at least one inorganic oxide support may be physically embedded in the porous framework.

The moisture-resistant catalyst for air pollution remediation is a catalyst with moisture-resistant properties, and which is used for removing nitrogen compound pollutants, such as ammonia (NH.sub.3), from air. The moisture-resistant catalyst for air pollution remediation includes at least one metal oxide catalyst, at least one inorganic oxide support for supporting the at least one metal oxide catalyst, and a porous framework for immobilizing the at least one metal oxide catalyst and the at least one inorganic oxide support, where the porous framework is moisture-resistant. As non-limiting examples, the at least one metal oxide catalyst may be supported on the at least one inorganic oxide support by precipitation, impregnation, dry milling, ion-exchange or combinations thereof. The at least one metal oxide catalyst supported on the at least one inorganic oxide support may be physically embedded in the porous framework.

A reactor that may contact a gas stream with a catalyst composition includes a catalyst bed module having a first grouping including a first plurality of foam catalyst blocks each bounded by a first front face having a first surface area with an opposing first back face, a first top side with an opposing first bottom side, and a first side face with an opposing first alternate side face and a second grouping adjacent to the first grouping and having a second plurality of foam catalyst blocks each bounded by a second front face having a second surface area with an opposing second back face, a second top side with an opposing second bottom side, and a second side face with an opposing second alternate side face. The first back face of the first plurality of foam catalyst blocks and the second back face of the second plurality of foam catalyst face each face the other in a spaced relationship. The reactor also includes a sealing frame disposed between the first and second groupings and that may maintain the spaced relationship and form a sealed volume between the first plurality of foam catalyst blocks and the second plurality of foam catalyst blocks and a support frame having a support surface and an opening and that may support the first grouping and the second grouping. The first grouping and the second grouping are secured to the support surface such that the opening is positioned between the first grouping and the second grouping and adjacent to the sealed volume, and the sealed volume and the opening provide a passage for gas flow.

A reactor that may contact a gas stream with a catalyst composition includes a catalyst bed module having a first grouping including a first plurality of foam catalyst blocks each bounded by a first front face having a first surface area with an opposing first back face, a first top side with an opposing first bottom side, and a first side face with an opposing first alternate side face and a second grouping adjacent to the first grouping and having a second plurality of foam catalyst blocks each bounded by a second front face having a second surface area with an opposing second back face, a second top side with an opposing second bottom side, and a second side face with an opposing second alternate side face. The first back face of the first plurality of foam catalyst blocks and the second back face of the second plurality of foam catalyst face each face the other in a spaced relationship. The reactor also includes a sealing frame disposed between the first and second groupings and that may maintain the spaced relationship and form a sealed volume between the first plurality of foam catalyst blocks and the second plurality of foam catalyst blocks and a support frame having a support surface and an opening and that may support the first grouping and the second grouping. The first grouping and the second grouping are secured to the support surface such that the opening is positioned between the first grouping and the second grouping and adjacent to the sealed volume, and the sealed volume and the opening provide a passage for gas flow.

The present invention provides a regeneration method and a regeneration device of a poisoning honeycomb catalyst, and belongs to the field of catalyst regeneration. The regeneration method of the poisoning honeycomb catalyst provided by the present invention includes the following steps: carrying out microwave heating treatment on the poisoning honeycomb catalyst, and then spraying liquid nitrogen into cells of the poisoning honeycomb catalyst so that the poisoning honeycomb catalyst is regenerated. The regeneration method provided by the present invention is simple, and the efficiency of the regenerated catalyst can be increased by 90% more than the original efficiency. According to the regeneration device of a poisoning honeycomb catalyst provided by the present invention, the catalyst regeneration is carried out by using the regeneration device provided by the present invention, the regeneration operation is simple, and the catalytic efficiency of the regenerated catalyst is improved.

A vacuum formed part includes at least two layers with one layer including a catalyst and the other not including a catalyst. At least one of the layers is formed by applying a slurry to a die or mold and applying a vacuum to the die or mold. The other layer may be formed from a slurry or may be provided onto the die or mold in the form of a fiber mat or blanket.

Disclosed are an extruded honeycomb catalyst, a process for preparing the catalyst, a method for reducing NOx in the exhaust gas from an internal combustion engine by using the catalyst, and a method for treatment of the emission gas generated from power plant comprising exposing the emission gas to the catalyst.

Methods and compositions related to a selective catalytic reduction catalyst comprising iron and vanadium, wherein the vanadium is present as (1) one or more vanadium oxides, and (2) metal vanadate of the form Fe.sub.xM.sub.yVO.sub.4 where x=0.2 to 1 and y=1−x, and where M comprises one or more non-Fe metals when y>0.