A catalyst for oxidising ammonia comprises a selective catalytic reduction (SCR) catalyst and a composite heterogeneous extruded honeycomb having longitudinally extending parallel channels, which channels being defined in part by channel walls having a total longitudinal length, wherein the channel walls comprise a pore structure including a periodic arrangement of porous cells embedded in an inorganic matrix component, at least some of which porous cells are defined at least in part by an active interface layer of a catalytically active material comprising a precious metal supported on particles of a support material.

A three-dimensional porous catalyst, catalyst carrier or absorbent monolith of stacked strands of catalyst, catalyst carrier or absorbent material, composed of alternating layers of linear spaced-apart parallel strands, wherein the strands in alternating layers are oriented at an angle to one another, wherein the distance between inner spaced-apart parallel strands is larger than the distance between outer spaced-apart parallel strands in at least a part of the layers of the monolith.

The present invention relates to a selective catalytic reduction catalyst for the treatment of an exhaust gas of a diesel engine comprising (i) a flow-through substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the flow-through substrate extending therethrough; (II) a coating disposed on the surface of the internal walls of the substrate, where-in the surface defines the interface between the passages and the internal walls, wherein the coating comprises a vanadium oxide supported on an oxidic material comprising titania, and further comprises a mixed oxide of vanadium and one or more of iron, erbium, bismuth, cerium, europium, gadolinium, holmium, lanthanum, lutetium, neodymium, praseodymium, promethium, samarium, scandium, terbium, thulium, ytterbium, yttrium, molybdenum, tungsten, manganese, cobalt, nickel, copper, aluminum and antimony.

The present invention relates to a selective catalytic reduction catalyst for the treatment of an exhaust gas of a diesel engine comprising (i) a flow-through substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the flow-through substrate extending therethrough; (II) a coating disposed on the surface of the internal walls of the substrate, where-in the surface defines the interface between the passages and the internal walls, wherein the coating comprises a vanadium oxide supported on an oxidic material comprising titania, and further comprises a mixed oxide of vanadium and one or more of iron, erbium, bismuth, cerium, europium, gadolinium, holmium, lanthanum, lutetium, neodymium, praseodymium, promethium, samarium, scandium, terbium, thulium, ytterbium, yttrium, molybdenum, tungsten, manganese, cobalt, nickel, copper, aluminum and antimony.

This exhaust gas purifying catalyst is provided with a substrate and a catalyst layer formed on a surface of the substrate. The catalyst layer contains zeolite particles that support a metal, and a rare earth element-containing compound that contains a rare earth element. The rare earth element-containing compound is added in such an amount that the molar ratio of the rare earth element relative to Si contained in the zeolite is 0.001 to 0.014 in terms of oxides.

A biochar-modified bismuth vanadate catalyst and a preparation method thereof, and a method for treating sulfonamide containing waste water are disclosed. The method for preparing the biochar-modified bismuth vanadate catalyst comprises preparation of a biochar: converting a walnut shell into a walnut shell biochar; preparation of a biochar-modified bismuth vanadate catalyst: dissolving a certain amount of P123 completely in concentrated nitric acid, adding ethanol, adding Bi(NO.sub.3).sub.3.5H.sub.2O and NH.sub.4VO.sub.3 while vigorously stirring, adding a biochar, adjusting the pH value, stirring for 0.5-2 hours, and then transferring the mixture to an autoclave, heating to 120° C. in a blast drying box and maintaining at the temperature for 12 hours, and naturally cooling to ambient temperature, to obtain a yellow precipitate, washing and dried the yellow precipitate, to obtain a biochar-modified bismuth vanadate catalyst.

A biochar-modified bismuth vanadate catalyst and a preparation method thereof, and a method for treating sulfonamide containing waste water are disclosed. The method for preparing the biochar-modified bismuth vanadate catalyst comprises preparation of a biochar: converting a walnut shell into a walnut shell biochar; preparation of a biochar-modified bismuth vanadate catalyst: dissolving a certain amount of P123 completely in concentrated nitric acid, adding ethanol, adding Bi(NO.sub.3).sub.3.5H.sub.2O and NH.sub.4VO.sub.3 while vigorously stirring, adding a biochar, adjusting the pH value, stirring for 0.5-2 hours, and then transferring the mixture to an autoclave, heating to 120° C. in a blast drying box and maintaining at the temperature for 12 hours, and naturally cooling to ambient temperature, to obtain a yellow precipitate, washing and dried the yellow precipitate, to obtain a biochar-modified bismuth vanadate catalyst.

Provided are catalysts for reduction of nitrogen oxides including an active site including lanthanum vanadate represented by at least one of Formula 1 and Formula 2 and a support carrying the active site.

LaVO.sub.4 (wherein LaVO.sub.4 is polymorphous and has a tetragonal or monoclinic crystal structure)  Formula 1

LaV.sub.3O.sub.9 (wherein LaV.sub.3O.sub.9 has a monoclinic crystal structure).  Formula

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.

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.