Abstract:
The present invention provides an apparatus and method for removing CO gas from gas streams or static air. One application of interest in removing CO from air to provide clean air to breathe or other application such as CO monitoring instruments for calibration, to the air side of the fuel cell and to the reformate stream that is employed for a PEM fuel cell. This invention protects the fuel cell catalyst by a means to controlling CO in the reformate stream. The control system is designed to minimize the CO concentration using the novel CO oxidation catalysts described above. One preferred embodiment catalyzes and monitors the CO to indicate the effectiveness; and further comprising two alternate chambers containing catalyst, which is made of high surface area substrate with supramolecular chemistry coated onto that substrate. These supramolecular catalyst converts CO gas to CO2 and at least one CO sensor monitors each catalyst chamber and control the process to maximize the fuel cell efficiency or to trigger a signal for service. Many other applications to reduce CO in static air as well as in gas stream are feasible including ultra zero air for CO measuring instruments, diving air, ultra-high purity laboratory air and air cleaners and air purifiers designed to reduce health impact to people in homes, hotels, health facilities, transportation systems, workplaces and in other enclosed structures.
Abstract:
Disclosed is a palladium-containing catalyst for producing an a,ß-unsaturated carboxylic acid from an olefin or an a,ß-unsaturated aldehyde with high productivity. Also disclosed are a method for producing such a catalyst, and a method for producing an a,ß-unsaturated carboxylic acid with high productivity. Specifically, a palladium-containing catalyst is produced by a method which has a step wherein palladium in the oxidation state is reduced by a compound (A) represented by the following formula (1).
Abstract:
The present invention provides a novel transesterification catalyst having the general formula: Zn 3 M 2 (CN) n (ROH).xZnCl 2 .yH 2 O wherein R is tertiary-butyl and M is a transition metal ion selected from Fe, Co and Cr, x varies from O to 0.5, y varies from 3-5 and n is 10 or 12. The above said catalyst is useful for an efficient transesterification of glycerides, fatty acid esters and cyclic carbonates on reactions with alcohols.
Abstract:
The present invention relates to the synthesis of chiral epoxides via a catalytic asymmetric oxidation of olefins. Additionally, the methodology provides a method of asymmetrically oxidizing sulfides and phosphines. This asymmetric oxidation employs a catalyst system composed of a metal and a chiral bishydroxamic acid ligand, which, in the presence of a stoichiometric oxidation reagent, serves to asymmetrically oxidize a variety of substrates.
Abstract:
The invention pertains to a process for activating an hydrotreating catalyst comprising a Group VIB metal oxide and a Group VIII metal oxide which process comprises contacting the catalyst with an acid and an organic additive which has a boiling point in the range of 80-500 °C and a solubility in water of at least 5 grams per liter (20 °C, atmospheric pressure), optionally followed by drying under such conditions that at least 50% of the additive is maintained in the catalyst. The hydrotreating catalyst may be a fresh hydrotreating catalyst or a used hydrotreating catalyst which has been regenerated.
Abstract:
There is provided a process for separating at least one phase transfer agent (PTA) from an organic liquid mixture containing at least one organic solvent and at least one PTA, in which the organic liquid mixture is brought into contact with one surface of a selectively permeable membrane and pressure is applied to the organic liquid mixture which causes a fraction of the organic liquid to permeate through the membrane and exit at the other surface, such that the concentration of the at least one PTA in the fraction of organic liquid which does not permeate the membrane increases while the concentration of the at least one PTA in the fraction of organic liquid which permeates through the membrane is less than the concentration of the at least one PTA in the original mixture.
Abstract:
The invention concerns a method for recovering a co-catalyst of an aqueous phase by treatment with a base and a step which consists in separating the co-catalyst whereby the co-catalyst is isolated from the aqueous phase treated with the base, typically by steam distillation or by distillation.
Abstract:
Self-heating characteristics of a spontaneously combustible catalyst are reduced by treating the catalyst with an oxygen-containing hydrocarbon having at least 12 carbon atoms. The treatment is particularly suitable for reducing the self-heating characteristics of sulfidable metal oxide(s)-containing catalysts, presulfurized catalysts, presulfided catalysts or reduced catalysts. When applied to sulfur-containing catalysts, the treatment gives a catalyst that has suppressed self-heating properties without substantially compromising sulfur retention or activity. Further hydrocracking catalysts treated by the oxygen-containing hydrocarbons give improved product yield. Further, a method of safely unloading a catalyst from a reactor is provided where the catalyst in the reactor is treated with a liquid mixture containing the oxygen-containing hydrocarbon to wet the catalyst.
Abstract:
In one aspect, the present disclosure encompasses polymerization systems for the copolymerization of CO 2 and epoxides comprising 1) a catalyst including a metal coordination compound having a permanent ligand set and at least one ligand that is a polymerization initiator, and 2) a chain transfer agent having one or more sites capable of initiating copolymerization of epoxides and CO 2 , wherein the chain transfer agent contains one or more masked hydroxyl groups. In a second aspect, the present disclosure encompasses methods for the synthesis of polycarbonate polyols using the inventive polymerization systems. In a third aspect, the present disclosure encompasses polycarbonate polyol compositions characterized in that the polymer chains have a high percentage of -OH end groups, a high percentage of carbonate linkages, and substantially all polycarbonate chains having hydroxyl end groups have no embedded chain transfer agent.
Abstract:
A trimerization catalyst composition comprising a trimerization catalyst compound selected from one or more organic metal salt, preferably alkali or earth alkali metal salts, and one or more compounds selected from compounds which comprise a carboxamide group having the structure -CO-NH 2 and/or from compounds which comprise a group having the structure -CO-NH-CO- is disclosed. Further a stable polyisocyanate composition comprising the catalyst composition and a process for making the polyisocyanate composition is disclosed. A curable polyisocyanate composition is obtained comprising the catalyst composition, a polyisocyanate composition, an epoxy resin and optionally a polyol/monool composition and a polyisocyanurate comprising material made by allowing the curable composition to react at elevated temperature and a process for making the polyisocyanurate comprising material.