A method comprising contacting an offgas stream comprising H2, H2O, CO, CO2, and at least one impurity comprising COS with at least one metal oxide to catalyze a reaction of H2O and COS to form H2S and CO2 in the offgas stream; contacting the offgas stream with an H2S-adsorbent to remove H2S from the offgas stream to produce a treated gas stream; and separating the treated gas stream to produce a carbon dioxide-enriched stream and a carbon dioxide-depleted stream.

A transformational energy efficient technology using ionic liquid (IL) to couple with monoethanolamine (MEA) for catalytic CO.sub.2 capture is disclosed. [EMmim.sup.+][NTF.sub.2.sup.] based catalysts are rationally synthesized and used for CO.sub.2 capture with MEA. A catalytic CO.sub.2 capture mechanism is disclosed according to experimental and computational studies on the [EMmim.sup.+][NTF.sub.2.sup.] for the reversible CO.sub.2 sorption and desorption.

The present invention describes an improved catalytic reactor system with an improved catalyst that transforms CO.sub.2 and low carbon H.sub.2 into low-carbon syngas with greater than an 80% CO.sub.2 conversion efficiency, resulting in the reduction of plant capital and operating costs compared to processes described in the current art. The inside surface of the adiabatic catalytic reactors is lined with an insulating, non-reactive surface which does not react with the syngas and effect catalyst performance. The improved catalyst is robust, has a high CO.sub.2 conversion efficiency, and exhibits little or no degradation in performance over long periods of operation. The low-carbon syngas is used to produce low-carbon fuels (e.g., diesel fuel, jet fuel, gasoline, kerosene, others), chemicals, and other products resulting in a significant reduction in greenhouse gas emissions compared to fossil fuel derived products.

A transformational energy efficient technology using ionic liquid (IL) to couple with monoethanolamine (MEA) for catalytic CO.sub.2 capture is disclosed. [EMmim.sup.+][NTF.sub.2.sup.] based catalysts are rationally synthesized and used for CO.sub.2 capture with MEA. A catalytic CO.sub.2 capture mechanism is disclosed according to experimental and computational studies on the [EMmim.sup.+][NTF.sub.2.sup.] for the reversible CO.sub.2 sorption and desorption.

The invention relates to methods and equipment for treating industrial vapor and liquid waste streams to remove certain compounds and concentrate those compounds to produce a chemical product. Specifically, the invention related to methods and equipment for condensing vapor waste streams and combining those streams with other liquid waste streams, and processing those combined streams to separate certain compounds for further processing into a chemical product, such as a fertilizer, and to thereby to reduce pollution, odor, and nutrient loading to air and water resources and wastewater processing systems.

A treatment method for stabilizing at least a portion of at least one heavy metal contained in a sodic fly ash to reduce leachability, wherein the sodic fly ash is provided by a process whereby a sodium-based sorbent is injected in a combustion flue gas to remove pollutants therefrom. The treatment method comprises contacting the sodic fly ash with at least one water-soluble source of silicate and at least one additive comprising calcium and/or magnesium. The material obtained from the contacting step is preferably dried. The additive may be selected from the group consisting of lime kiln dust, fine limestone, quicklime, hydrated lime, dolomitic lime, dolomite, selectively calcined dolomite, hydrated dolomite, magnesium hydroxide, magnesium carbonate, magnesium oxide, and any mixture thereof. A particularly preferred additive comprises lime kiln dust and/or dolomitic lime. The heavy metal to be stabilized in the sodic fly ash may comprise selenium and/or arsenic.

Producing biomass includes providing a gas including carbon dioxide to a reaction chamber including a reaction medium, photocatalytically converting the carbon dioxide in the reaction medium into organic carbon-containing compounds, growing the bacteria in the reaction medium, and harvesting the bacteria. The reaction medium is an aqueous mixture including bacteria and trace elements. Photocatalytically converting carbon dioxide includes providing light to side-emitting optical fibers positioned in the reaction medium. An air purification system includes a single reaction chamber configured to contain bacteria, first and second inlets, one or more side-emitting optical fibers, and an outlet configured to allow harvesting of the bacteria. Producing bacterial biomass and purifying air includes providing a gaseous feedstock to a reaction chamber including a reaction medium, photocatalytically converting carbon dioxide into organic carbon-containing compounds, growing the bacteria in the reaction medium, harvesting the bacteria, and removing a gaseous output stream from the reaction chamber.

Described herein are methods and systems for generating CO.sub.2 clathrate hydrates, for compaction of CO.sub.2 hydrates into a plug, and sealing the plug into a container to prevent dissociation of the plug. The disclosed methods and systems advantageously allow for the rapid formation of CO.sub.2 clathrate hydrates in water and sealing the CO.sub.2 clathrate hydrate in a container for long term storage on the seabed. CO.sub.2 clathrate hydrates can be useful for CO.sub.2 sequestration and securely storing the CO.sub.2 clathrate hydrate as a solid.