A correction method of NOx purifying efficiency of SDPF includes: measuring a temperature change per unit time inside the SDPF, determining whether the temperature change per unit time inside the SDPF is below a first predetermined value, determining whether a difference between a maximum value and a minimum value of temperature of respective parts inside the SDPF is below a second predetermined value if the temperature change per unit time inside the SDPF is below the first predetermined value, determining whether a temperature inside the SDPF is in a low temperature region if the difference between the maximum value and the minimum value of temperature of the respective parts inside the SDPF is below the second predetermined value, and performing a low temperature region correction if the temperature inside the SDPF is in the low temperature region.

Embodiments of point-of-use (POU) abatement device and methods of abating a plurality of gas streams from a corresponding plurality of processing chambers are provided herein. In some embodiments, a compact POU abatement device includes a plurality of inlets respectively coupled to a plurality of process chambers in which each of the process chambers gas streams is isolated from the other gas streams. In some embodiments, the compact POU abatement device can include a plurality of oxidation devices and a corresponding plurality of wet scrubber columns each directly coupled to ones of the plurality of inlets to receive a gas stream from a corresponding process chamber.

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; and a first catalytic region on the substrate; wherein the first catalytic region comprises a first PGM component and a first alumina, wherein the first alumina is doped with a first dopant of at least 5 wt. %, and wherein the first dopant is selected from the group consisting of Zr, Ta, Mo, W, Ti, Nb, and a combination thereof.

An exemplary single bed reversing blower adsorption based air separation unit is configured to follow the O.sub.2 load placed thereon by adjusting flow rates therethrough and power consumption. At least one and preferably multiple pressure sensors sense O.sub.2 pressure within an O.sub.2 storage region downstream of an adsorber vessel. These sensed pressures are utilized to generate control signals controlling flow rates at locations upstream of the compressor, such as at a reversible blower and an output compressor. Control loops for the blower and the compressor are independent of each other and have different time constants. Effective following of the O.sub.2 load is thus achieved without driving the air separation unit into operational conditions outside of design and also maintaining optimal power consumption for the O.sub.2 produced, such that efficiency is maintained over a large turndown ratio.

An object of the present invention is to provide a new frameless catalytic thermal oxidation device capable of treating concentrations of harmful materials including NOx at a low temperature. Further, another object of the present invention is to provide a frameless catalytic thermal oxidation device capable of minimizing the occurrence of THC and minimizing a risk of accidents and environmental pollution which may occur in maintenance operations. According to the objects, the present invention provides a cartridge-type thermal oxidation device capable of being separated for maintenance, wherein a cartridge internal structure is configured so that the time while the material to be treated stays in a zone with the catalyst is increased, and a member capable of dropping and collecting powder generated by thermal oxidation reaction is configured.

A sorbent product, including from about 1 wt % to about 99 wt %, based on the total weight of the sorbent product, of at least one base sorbent material; and from about 1 wt % to about 99 wt %, based on the total weight of the sorbent product, of at least one binder. The sorbent product may further include at least from about 0 wt % to about 99% wt %, based on the total weight of the sorbent product, of at least one additional additive. Methods for making same and methods and systems for controlling multiple pollutants are also included.

The embodiments of the disclosure relate generally to adsorbent beds, adsorbent contactors, and methods of using same. The disclosure includes polymer filaments that include an adsorbent particle, such as a zeolite, metal oxide, metal organic framework. A plurality of fibers composed of the polymer filaments can be formed into an adsorbent bed for use in pressure swing and/or temperature swing adsorption processes. The plurality of fibers can be packed into a bed randomly, spirally wound, or woven into a fabric that can be formed into a contacting structure. The adsorbent particle can be contained within the polymer filament and can interact with a medium having a component for adsorption by being in fluid communication with the medium via tortuous pathways within the polymer.

A selective catalytic reduction filter (SCRF) including a wall-flow substrate having inlet channels and outlet channels is provided. A first selective catalytic reduction (SCR) catalyst zone is present in the inlet channels, and a second SCR catalyst zone is present in the outlet channels. The first SCR catalyst zone includes an iron-exchanged zeolite catalyst, and the second SCR catalyst zone includes a copper-exchanged zeolite catalyst. Exhaust gas treatment systems including the SCRF and methods of reducing production of nitrous oxide (N.sub.2O) during selective catalytic reduction of an exhaust gas stream using the SCRF are also provided herein.

Metal-containing sorbent materials are provided, methods of making the metal-containing sorbent materials, methods of using the metal-containing sorbent materials, and metal complex-containing composite materials resulting from the sorption of basic, nitrogen-containing compounds on the metal-containing sorbent materials are provided. The sorbent materials are prepared by incorporating divalent metals into a precursor material that is formed by treating a porous siliceous material having mesopores with a silane or disilazane surface treatment agent. The metal-containing sorbent materials can be used to capture basic, nitrogen-containing compounds having a molecular weight no greater than 150 grams/mole.

Disclosed herein is a process for separation and purification of a fermentation gas product from a fermenter off-gas containing a fermentation product, volatile impurities, bio-product impurities and water, based on a membrane system. In one preferred embodiment of the present invention, the process of separating and purifying a fermentation product from a fermenter off-gas, containing the fermentation product, volatile impurities, bio-byproduct impurities and water, comprises the steps of: (a) compressing the fermenter off-gas and feeding it into a membrane module, and (b) selectively permeating the volatile impurities, bio-byproduct impurities and water through the membrane, resulting in a product rich retentate stream. The fermentation gas product is separated from the fermenter off-gas in a single membrane stage to produce a purified retentate stream. In accordance with this embodiment of the invention, the fermenter off-gas (2), comprising the fermentation gas product, volatile impurities, bio-byproduct impurities and water, passes through a blower (201) that transports it to a gas holder (202), in order to smooth the process fluctuations. Stream (11) exits the gas holder (202) and is compressed in a multi-stage compressor (203), from which bio-byproduct and water are removed through stream (4). The compressed stream (12) enters the membrane module (204), which permeates the volatile impurities, disposing them in stream (13). The process may be still conducted in a 2-stage membrane system in accordance with the present invention.