University of Central Florida Research Foundation Inc

Other

Clovis Alan Linkous

Nazim Z Muradov

Darlene Kay Slattery

Danielle Delong Nangle

Cunping Huang

Karthikeyan Kallupalayam Ramasamy

Franklyn Smith

Ali T Raissi

A system for hydrogen sulfide removal from a sour gas mixture including hydrogen sulfide. The sour gas mixture is reacted with a transition metal compound in a scrubber. Sulfide from the hydrogen sulfide is oxidized to form elemental sulfur and the transition metal is reduced to form a reduced state transition metal compound. An electrochemical redox reaction is performed including the reduced state transition metal compound to regenerate the transition metal compound in an electrolyzer including a power source. During the electrochemical redox reaction a voltage from the power source applied to the electrolyzer is controlled to regenerate the transition metal compound at a rate sufficient to match a flow rate of hydrogen sulfide into the scrubber or maintain a predetermined maximum hydrogen sulfide level out from the scrubber. The transition metal compound regenerated is returned to the scrubber for the reacting.

Method and system for hydrogen sulfide removal

Thermoplastic surface modification is achieved with photocatalysts, such as titanium dioxide, tungsten oxide and mixtures thereof. A uniform coating of a powdered photocatalyst is applied to a thermoplastic surface that is wetted with an organic solvent. The coating is in a range between approximately 1.5 mg/cmto approximately 2.5 mg/cm. After the uniform coating of photocatalyst is dried, the thermoplastic surface is heated to a temperature above its softening temperature, usually in a range between approximately 80&#xb0; C. to approximately 130&#xb0; C.; then, a mild pressure is applied to imbed the photocatalyst into the surface of the thermoplastic sheet. The method of modification is inexpensive, long-lasting and non-detrimental to the thermoplastic surface. A surface is provided with improved aesthetic appearance, extended lifetime and sustained protection from undesirable growth of nuisance organisms, such as algae, fungus, bacteria, mold, mildew and the like.

Surfaces of thermoplastic sheets and structures modified with photocatalytic materials

Organic pigments are capable of catalyzing the decomposition reaction of hydrogen-rich, stabilized, borohydride solutions to generate hydrogen gas on-board an operable hydrogen-consuming device such as a motor vehicle or other combustion engine. The organic pigments are used in hydrogen generating systems and in methods for controlling the generation of hydrogen gas from metal hydride solutions.

Catalysts for the evolution of hydrogen from borohydride solution

Method of applying photocatalysts to thermoplastic surfaces

Methods and systems for separating hydrogen and sulfur from hydrogen sulfide(HS) gas. Hydrogen sulfide(HS) gas is passed into a scrubber and filtration unit with polysulfide solution. Interaction frees elemental sulfur which is filtered, excess continues to a stripper unit where the excess HS is removed. The excess HS returns to the scrubber and filtration unit, while the sulfide solution passes into a photoreactor containing a photocatalyst and a light source. The sulfide solution is oxidatively converted to elemental sulfur and complexed with excess sulfide ion to make polysulfide ion, while water is reduced to hydrogen. Hydrogen is released, while the polysulfide solution is fed back to the scrubber unit where the system operation repeats. In a second embodiment, the photocatalyst is eliminated, and the hydrogen sulfide solution is directly illuminated with ultraviolet radiation with a light source such as a low pressure mercury lamp operating at approximately 254 nm.

UV photochemical option for closed cycle decomposition of hydrogen sulfide

System for separating hydrogen and sulfur from hydrogen sulfide (H S) gas produced from oil and gas waste streams. Hydrogen sulfide (H S) gas is passed into a scrubber and filtration unit where it encounters polysufide solution. Elemental sulfur is freed and filtered through a porous media and continues to a stripper where excess H S is removed. The excess H S returns to the scrubber and filtration unit, while the sulfide solution passes into a photoreactor. The sulfide solution inside the photoreactor is oxidatively converted to elemental sulfur and complexed with excess sulfide ion to make polysulfide ion, while water is reduced to hydrogen. Hydrogen percolates out of the photoreactor, while the polysulfide solution is fed back to the scrubber where the system starts over.

Closed cycle photocatalytic process for decomposition of hydrogen sulfide to its constituent elements

Inexpensive, and easy to use self cleaning mixtures that use photoactive agents such as titanium dioxide(TiO ) and tungsten oxide(WO ) along with mixing the agents with co-catalysts such as carbon(C), Fe(iron), Cu(copper), Ni(nickel) and CO P. In addition, the co-catalyst loading can include up to approximately 5% carbon to maximize the inhibiting algae growth. The mixtures can be used to inhibit various growth organisms such as but not limited to algae, fungus, bacteria and mold. The agents can be combined together, and/or each agent can be combined with various coatings, such as but not limited to a cement or a polymer binder. The coatings can be applied to surfaces that are exposed to water such as but not limited to an aquarium, liners on the inner walls of swimming pools, drinking water tanks, and the like. Additionally, the coatings can be used as surfacing agent in contact with water within solar water heaters, piping adjacent to pool pumps, and the like. Additionally, the photoactive agent can be used as a non-toxic algae-retardant marine paint. Furthermore, the coatings can be applied to surfaces such as bathroom fixtures, toilets, bathtubs, sinks, and used on tiles in kitchens, bathrooms, and the like.

Photocatalytic nuisance organism inhibitor agents

A method and system for separating hydrogen and sulfur from hydrogen sulfide(H,S) gas being produced from oil and gas waste streams. The hydrogen sulfide(H,S) gas is first passed into a scrubber and filtration unit where it encounters polysulfide solution. Elemental sulfur is freed when the H,S interacts with the solution, the sulfur is filtered through a porous media such as a ceramic frit, and continues to a stripper unit where the excess H,S is removed from the sulfide solution. The excess H,S returns to the scrubber and filtration unit, while the sulfide solution passes into a photoreactor containing a semiconductor photocatalyst such as Cadmium Sulfide(CdS), Platinized Cadmium Sulfide, Pt-CdS, Zinc Sulfide, ZnS, Zinc Ferrate, ZnFe,O,, Indium Sulfide, In,S,, along with a 450-500 nm light source.

Self cleaning mixtures that use photoactive agents with varying oxides, along with mixing the photoactive agents with carbon, noble metals and cobalt phosphide that inhibit the growth of algae are disclosed. The agents include concentrations of approximately at least 5% to approximately 50% TiO.sub.n1, WO.sub.n2, X--WO.sub.n2, or X--TiO.sub.n1, where 1.8.ltoreq.n1.ltoreq.2, and where 2.2.ltoreq.n2.ltoreq.3, and where X can be one of carbon, a noble metal, and cobalt phosphide. The agents can be combined together, and/or each agent can be combined with various coatings such as but not limited to a cement or a polymer binder. The coatings and agents can be applied to surfaces that are exposed to water such as but not limited to an aquarium, liners on the inner walls of swimming pools, drinking water tanks and the like. Further, applications can include using the novel surfacing agent as part of a solar water heater for both a home and a pool, wherein in the latter application the heater is connected between pool pumps and the pool so that when light is absorbed inside the heater, the surfacing agent becomes active for inhibiting the growth of algae. The photoactive agent can also be applied as a non-toxic algae-retardant marine paint. The invention can be used to inhibit the growth of other undesirable substances such as fungus, bacteria and mold.

Photocatalytic surfacing agents with varying oxides for inhibiting algae

Self cleaning mixtures that use photoactive agents with varying oxides, along with mixing the photoactive agents with carbon, noble metals and cobalt phosphide that inhibit the growth of algae are disclosed. The agents include concentrations of approximately at least 5% to approximately 50% TiO.sub.n1, WO.sub.n2, X-WO.sub.n2, or X-TiO.sub.n1, where 1.8.ltoreq.n1.ltoreq.2, and where 2.2.ltoreq.n2.ltoreq.3, and where X can be one of carbon, a noble metal, and cobalt phosphide. The agents can be combined together, and/or each agent can be combined with various coatings such as but not limited to a cement or a polymer binder. The coatings and agents can be applied to surfaces that are exposed to water such as but not limited to an aquarium, liners on the inner walls of swimming pools, drinking water tanks and the like. Further, applications can include using the novel surfacing agent as part of a solar water heater for both a home and a pool, wherein in the latter application the heater is connected between pool pumps and the pool so that when light is absorbed inside the heater, the surfacing agent becomes active for inhibiting the growth of algae. The photoactive agent can also be applied as a non-toxic algae-retardant marine paint. The invention can be used to inhibit the growth of other undesirable substances such as fungus, bacteria and mold.

Mixtures that use photoactive agents that inhibit the growth of algae are disclosed. The agents include concentrations of approximately at least 5% to approximately 50% TiO.sub.2, WO.sub.3, PtWO.sub.3 --Pt--WO.sub.3, or Pt--TiO.sub.2. The agents can be combined together, and/or each agent can be combined with various coatings such as but not limited to a cement or a polymer binder. The coatings and agents can be applyed to surfaces that are exposed to water such as but not limited to an aquarium, liners on the inner walls of swimming pools, drinking water tanks and the like. Further, applications can include using the novel surfacing agent as part of a solar water heater for both a home and a pool, wherein in the latter application the heater is connected between pool pumps and the pool so that when light is absorbed inside the heater, the surfacing agent becomes active for inhibiting the growth of algae. The photoactive agent can also be applied as a non-toxic algae-retardant marine paint.

Photocatalytic surfacing agents for inhibiting algae growth

An electrolyzer is provided for electrolyzing water into its constituent elements, namely oxygen and hydrogen gas. The electrolyzer includes a vessel in which a sulfonated solid polymer electrolyte is situated. The sulfonated solid polymer electrolyte is selected from a group including sulfonated polyetheretherketone (SPEEK), sulfonated polyethersulfone (SPES), sulfonated polybenzimidazole (SPBI), sulfonated polyphenylquinoxaline (SPPQ) and sulfonated fluorinated polyimide (SFPI). The electrolyzer also includes anode and cathode electrodes situated on the electrolyte. A direct current (DC) power supply is coupled to said anode and cathode electrodes to drive the reaction. A heater heats the electrolyte and a water supply is connected to one of said cathode and anode electrodes. The resultant oxygen and hydrogen are collected at the respective electrodes. The solid polymer electrolyte desirably operates with relatively high ionic conductivity at high temperatures without loss of structural integrity. In this manner, a high rate of gas output is achieved with substantially lower drive voltage and energy consumption.

Growing community of inventors

Merritt Island, FL, United States of America

Clovis Alan Linkous