Embodiments described herein generally relate to compositions for CO.sub.2 absorption, desorption, and/or capture and processes for making such compositions. Embodiments described herein also generally relate to processes for CO.sub.2 absorption, CO.sub.2 desorption, and/or CO.sub.2 capture. In an embodiment, a composition for absorbing or desorbing CO.sub.2 is provided. The composition includes an organic amine. the composition further includes a carbon organic framework, an ion thereof, or combinations thereof, the carbon organic framework comprising a plurality of carboxylic acids. In another embodiment, a process for capturing CO.sub.2 from a gas stream is also provided. The process includes introducing the gas stream with a composition described herein under absorption conditions, the gas stream comprising CO.sub.2. The process further includes forming a CO.sub.2-enriched composition.

A high-adsorption-performance nanofiber filter medium includes a support material and a composite nanofiber filtration layer that includes multiple nanometer composite nanofiber layers deposited and stacked on the support material. The nanometer composite nanofiber layer includes first, second, and third nano-powder composite nanofibers, which are uniformly mixed by means of an airflow or are sequentially laminated to form the nanometer composite nanofiber layer. The nanometer composite nanofiber layer formed through sequential lamination includes first, second, and third nanofiber layers. The first nanofiber layer includes multiple first nano-powder composite nanofibers. The second nanofiber layer is stacked on the first nanofiber layer and includes multiple second nano-powder composite nanofibers. The third nanofiber layer is stacked on the second nanofiber layer and includes multiple third nano-powder composite nanofibers. The composite nanofiber filtration layer is formed of multiple nanometer composite nanofiber layers, so that the high-adsorption-performance nanofiber air filter medium shows improved performance.

An air supply system for a fuel cell includes: a fuel cell stack in which multiple unit cells are stacked and that generates electricity through chemical reactions, an air channel to supply incoming air containing oxygen to the fuel cell stack and to transfer air discharged from the fuel cell stack to the outside of the air supply system, and a gas adsorption unit that is disposed on the air channel, positioned near an outlet of the fuel cell stack, and adsorbs oxygen contained in the air introduced into the air channel.

The present invention discloses methods for extracting and recycling hydrogen in an MOCVD process by FTrPSA. Through pretreatment, fine deamination, PSA hydrogen extraction, deep dehydration and hydrogen purification procedures, ammonia-containing waste hydrogen from an MOCVD process is purified to meet the electronic-level hydrogen (the purity is greater than or equal to 99.99999% v/v) standard required by the MOCVD process, to implement resource reuse of exhaust gases, where the hydrogen yield is greater than or equal to 75-86%. The present invention solves the technical problem that atmospheric-pressure or low-pressure waste hydrogen from MOCVD processes cannot be returned to the MOCVD processes for use after being recycled, and fills the gap in green and circular economy development of the LED industry.

In a helium purification process, a stream containing at least 10% of helium, at least 10% of nitrogen in addition to hydrogen and methane is separated to form a helium-enriched stream containing hydrogen, a first stream enriched in nitrogen and in methane and a second stream enriched in nitrogen and in methane, the helium-enriched stream is treated to produce a helium-rich product and a residual gas containing water, the residual gas is treated by adsorption (TSA) to remove the water and the regeneration gas from the adsorption is sent to a combustion unit (O).

Trace hydrogen may be removed from a dry gas by passing the dry gas at a temperature from about 0° C. to about 60° C. through at least one layer of a first hopcalite catalyst to produce product gas that is at least substantially free of hydrogen, wherein the first hopcalite catalyst has a molar ratio of copper to manganese of more than 0.55. Advantages include increase hydrogen capacity, lower feed and regeneration temperatures and lower sensitivity to carbon dioxide than equivalent processes using standard hopcalite catalyst having a Cu/Mn molar ratio from 0.45 to 0.55.

Various illustrative embodiments of a system and process for recovering high-quality biomethane and carbon dioxide product streams from biogas sources and utilizing or sequestering the product streams are provided. The system and process synergistically yield a biomethane product which meets gas pipeline quality specifications and a carbon dioxide product of a quality and form that allows for its transport and sequestration or utilization and reduction in greenhouse gas emissions. The system and process result in improved access to gas pipelines for products, an improvement in the carbon intensity rating of the methane fuel, and improvements in generation of credits related to reductions in emissions of greenhouse gases.

Disclosed herein are metal-organic frameworks and methods of making and use thereof.

A fuel oxygen reduction unit for an engine is provided. The fuel oxygen reduction unit includes a contactor including a fuel inlet that receives an inlet fuel flow and a stripping gas inlet that receives an inlet stripping gas flow, the contactor configured to form a fuel/gas mixture; a separator that receives the fuel/gas mixture, the fuel oxygen reduction unit defining a circulation gas flowpath from the separator to the contactor; and a stripping gas source selectively in fluid communication with the circulation gas flowpath for selectively introducing a stripping gas from the stripping gas source to the circulation gas flowpath, wherein the stripping gas source is an accessory gearbox.

The present invention discloses a dual functional photocatalytic device and a process for photocatalytic co-conversion of CO.sub.2 and H.sub.2O to value added products in direct sunlight. More particularly, the present invention relates to efficient and continuous process for the photocatalytic co-conversion of a mixture of CO.sub.2 and water into methanol, formaldehyde, in the presence of newly developed dual-functional photocatalyst device. The present invention is to provide dual-functional photocatalyst device, along with a co-catalyst and integrating them into a photocatalytic device using artificial leaf approach wherein said device is in the form of thin film working under wide spectrum of solar radiation at ambient conditions. Additionally it is easy to scale up the photocatalyst device size from 1 cm.sup.2 to 10 cm.sup.2 size and process is tuneable to generate desired products.