The present application is directed to a method for the conversion of nitrous acid to dinitrogen gas. In particular, the present application relates to a method for the conversion of nitrous acid to dinitrogen gas by contacting the nitrous acid with an amine-functionalized metal organic framework.

A system for capturing CO.sub.2 gas comprising: a gaseous feed stream having an initial concentration of the CO.sub.2 gas; wherein the gaseous feed stream is provided to a first reactor as a gaseous reaction stream; the first reactor comprising a sorbent composition and the gaseous reaction stream flowing therein, the gaseous reaction stream being in contact with the sorbent composition; and a first gaseous output stream having a concentration of CO.sub.2 being less than the initial concentration of CO.sub.2; wherein: the gaseous reaction stream comprises the CO.sub.2 gas and is characterized by a relative humidity of at least 5%; the sorbent composition comprises a metal carbonate material that reacts with the CO.sub.2 gas of the gaseous reaction stream thereby reducing CO.sub.2 gas concentration; and the first reactor comprises 35 wt. % or less of liquid water by weight of sorbent and liquid water.

A system for capturing CO.sub.2 gas comprising: a gaseous feed stream having an initial concentration of the CO.sub.2 gas; wherein the gaseous feed stream is provided to a first reactor as a gaseous reaction stream; the first reactor comprising a sorbent composition and the gaseous reaction stream flowing therein, the gaseous reaction stream being in contact with the sorbent composition; and a first gaseous output stream having a concentration of CO.sub.2 being less than the initial concentration of CO.sub.2; wherein: the gaseous reaction stream comprises the CO.sub.2 gas and is characterized by a relative humidity of at least 5%; the sorbent composition comprises a metal carbonate material that reacts with the CO.sub.2 gas of the gaseous reaction stream thereby reducing CO.sub.2 gas concentration; and the first reactor comprises 35 wt. % or less of liquid water by weight of sorbent and liquid water.

This invention provides a method of removing sulfur oxides, mercury vapor and other contaminants from a flue gas stream and a flue gas treatment device comprising a sorbent polymer composite substrate comprising a high surface area support and a durable halogen source adjacent the sorbent polymer composite substrate. The halogen source comprises a compound with a quaternary ammonium halogen salt that is not washed away.

Sorbent polymeric material suitable for capturing formaldehyde, polymeric material resulting from the capture of formaldehyde by the sorbent polymeric material, and methods for capturing formaldehyde are provided. The sorbent polymeric material has multiple aromatic rings and can be formed by initially preparing a precursor polymeric material from a polymerizable composition that contains a free-radically polymerizable spirobisindane monomer. The precursor polymeric material is subsequently treated with a sulfonyl-containing compound to form groups of formula —SO.sub.2R.sup.5 where each R.sup.5 is independently —NH.sub.2 or —NR.sup.6-Q-NR.sup.6R.sup.7. Each R.sup.6 is hydrogen or an alkyl. Each R.sup.7 is hydrogen or —C(═NH)—NH.sub.2. Each Q is a single bond, alkylene, or a group of formula -(Q.sup.1-NR.sup.6).sub.x-Q.sup.2- where each Q.sup.1 is an alkylene, each Q.sup.2 is an alkylene, and x is in an integer in a range of 1 to 4.

Sorbent polymeric material suitable for capturing formaldehyde, polymeric material resulting from the capture of formaldehyde by the sorbent polymeric material, and methods for capturing formaldehyde are provided. The sorbent polymeric material has multiple aromatic rings and can be formed by initially preparing a precursor polymeric material from a polymerizable composition that contains a free-radically polymerizable spirobisindane monomer. The precursor polymeric material is subsequently treated with a sulfonyl-containing compound to form groups of formula —SO.sub.2R.sup.5 where each R.sup.5 is independently —NH.sub.2 or —NR.sup.6-Q-NR.sup.6R.sup.7. Each R.sup.6 is hydrogen or an alkyl. Each R.sup.7 is hydrogen or —C(═NH)—NH.sub.2. Each Q is a single bond, alkylene, or a group of formula -(Q.sup.1-NR.sup.6).sub.x-Q.sup.2- where each Q.sup.1 is an alkylene, each Q.sup.2 is an alkylene, and x is in an integer in a range of 1 to 4.

A gas purification agent includes an electronegative film-forming agent and a foaming agent. The electronegative film-forming agent accounts for 20-80 wt % of the gas purification agent, while the foaming agent accounts for 20-80 wt % of the gas purification agent. The gas purification agent of such a composition can be used as a haze removing agent to effectively remove fine dust particles such as PM10 and PM2.5 from the air. The gas purification agent includes 2.5-25 wt % of the electronegative film-forming agent, 2.5-25 wt % of the foaming agent, and 50-95 wt % of a desulfurizing agent. The gas purification agent of such a composition can be used as a desulfurizing agent to remove sulfur-containing compounds from industrial exhaust gases. A method for using the gas purification agent is also provided.

A gas purification agent includes an electronegative film-forming agent and a foaming agent. The electronegative film-forming agent accounts for 20-80 wt % of the gas purification agent, while the foaming agent accounts for 20-80 wt % of the gas purification agent. The gas purification agent of such a composition can be used as a haze removing agent to effectively remove fine dust particles such as PM10 and PM2.5 from the air. The gas purification agent includes 2.5-25 wt % of the electronegative film-forming agent, 2.5-25 wt % of the foaming agent, and 50-95 wt % of a desulfurizing agent. The gas purification agent of such a composition can be used as a desulfurizing agent to remove sulfur-containing compounds from industrial exhaust gases. A method for using the gas purification agent is also provided.

In one embodiment, a separation membrane includes: a porous support structure, wherein the porous support structure comprises a system of continuous pores connecting an inlet of the separation membrane to an outlet of the separation membrane; and at least one alkali metal hydroxide disposed within pores of the porous support structure. Other aspects and embodiments of the disclosed inventive concepts will become apparent from the detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.

In one embodiment, a separation membrane includes: a porous support structure, wherein the porous support structure comprises a system of continuous pores connecting an inlet of the separation membrane to an outlet of the separation membrane; and at least one alkali metal hydroxide disposed within pores of the porous support structure. Other aspects and embodiments of the disclosed inventive concepts will become apparent from the detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.