The present disclosure relates to hydrocarbon emission control systems. More specifically, the present disclosure relates to substrates coated with hydrocarbon adsorptive coating compositions and evaporative emission control systems for controlling evaporative emissions of hydrocarbons from motor vehicle engines and fuel systems.

The present invention is related to superabsorbent polymer, a method of making the same, and a foodstuff packaging material including the same. The superabsorbent polymer includes a saturated organic acid and maintains excellent absorptive capacity and retention capability. Since the superabsorbent polymer has a high level of polymerization and stability after a polymerization of the aforementioned making method, the superabsorbent polymer has an antibacterial property and a low amount of extractives with low molecular weights. Hence, the superabsorbent polymer can be used as foodstuff packaging material.

A system includes a biochar sorbent system having a biochar sorbent chamber configured to support a biochar, and an exhaust path configured to flow an exhaust gas through the biochar sorbent chamber, wherein the biochar sorbent system is configured to adsorb an undesirable gas from the exhaust gas into the biochar to generate an enriched biochar and a treated gas.

A method of manufacturing a bone char absorbent includes the following steps. A drying step is performed on an initial bone material to form dried bone material. A torrefaction step or a co-torrefaction step is performed on the dried bone material to form torrefied bone material or a co-torrefied mixture, in which the torrefaction step and the co-torrefaction are performed at a heating rate of 10 C./min to 20 C./min to a torrefied temperature or a co-torrefied temperature of 175 C. to 300 C. for 15 minutes to 60 minutes. A cooling step is performed on the torrefied bone powders or the co-torrefied mixture to form the bone char absorbent. The mineral phase of the bone char absorbent includes carbonated hydroxyapatite, thereby enhancing the adsorption capacity for trivalent arsenic ions.

High purity carbon sorbent monoliths, particularly effective for the removal of trace-contaminants such as ammonia, formaldehyde, and methyl mercaptan from a gas flow, are fabricated by 3D-printing polymer monoliths, pre-oxidizing them in a flow of air at a temperature below the melting point of the polymer precursor, carbonizing them, and subsequently activating them to a weight loss of about 20 percent. The pre-oxidation step effectively prevents polymer-monolith swelling and melting during carbonization.

There is provided a method for producing water-absorbent resin particles, which have good general water absorption performance (for example, physiological saline absorption amount) required for a water-absorbent resin, and also have reduced yellowing under high temperature and high humidity and have high gel stability. A method for producing water-absorbent resin particles comprising, in the following order: step 1 of polymerizing a water-soluble ethylenically unsaturated monomer to obtain hydrous gel particles; step 2 of adding a chelating agent, a sulfite-based compound, and an organic antioxidant to the hydrous gel particles; and step 3 of subjecting the hydrous gel particles to a surface-crosslinking treatment, wherein in step 2, a water content in the hydrous gel particles when adding the sulfite-based compound is 20% by mass or more and 75% by mass or less.

A method for preparing a calcium-based metal-organic framework (Ca-MOF) for selectively adsorbing fishy off-odor compounds is disclosed. The method involves dissolving an organic acid and a calcium salt in an organic solvent, then transferring the solution to a high-pressure reactor for a high-temperature reaction. The solution is subsequently cooled to room temperature, followed by centrifuging, alcohol washing, and drying to yield Ca-MOF crystals. The resulting Ca-MOF demonstrates a selective and efficient adsorption of sulfur-containing compounds present in fishy off-odors, achieving up to a 97.3% removal efficiency for dimethyl trisulfide. With a fast adsorption rate, this Ca-MOF can be applied directly to food or used in an external sachet, making it suitable for diverse applications in food, medicine, and pesticides.

The present disclosure relates to hydrocarbon emission control systems. More specifically, the present disclosure relates to substrates coated with hydrocarbon adsorptive coating compositions and evaporative emission control systems for controlling evaporative emissions of hydrocarbons from motor vehicle engines and fuel systems.