Patents by Inventor Hazel Stephenson
Hazel Stephenson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11760653Abstract: This invention relates to azirconium hydroxideor zirconium oxide comprising, on an oxide basis, up to 30 wt % of a dopant comprising one or more of silicon, sulphate, phosphate, tungsten, niobium, aluminium, molybdenum, titanium or tin, and having acid sites, wherein the majority of the acid sites are Lewis acid sites. In addition, the invention relates to a catalyst, catalyst support or precursor, binder, functional binder, coating or sorbent comprising the zirconium hydroxide or zirconium oxide.Type: GrantFiled: January 30, 2017Date of Patent: September 19, 2023Assignee: Magnesium Elektron LimitedInventors: Hazel Stephenson, Iryna Chepurna, Deborah Jayne Harris, David Scapens
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Publication number: 20190292066Abstract: This invention relates to azirconium hydroxideor zirconium oxide comprising, on an oxide basis, up to 30 wt % of a dopant comprising one or more of silicon, sulphate, phosphate, tungsten, niobium, aluminium, molybdenum, titanium or tin, and having acid sites, wherein the majority of the acid sites are Lewis acid sites. In addition, the invention relates to a catalyst, catalyst support or precursor, binder, functional binder, coating or sorbent comprising the zirconium hydroxide or zirconium oxide.Type: ApplicationFiled: January 30, 2017Publication date: September 26, 2019Inventors: Hazel STEPHENSON, Iryna CHEPURNA, Deborah Jayne HARRIS, David SCAPENS
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Publication number: 20130212944Abstract: A zirconium-based mixed oxide or zirconium-based mixed hydroxide which is capable of (a) at least 90% v/v conversion of naphthalene at atmospheric pressure at a temperature in the range 600-700° C. using a residence time of about 0.3 seconds, and/or (b) providing an initial heat of adsorption of ammonia of greater than 150 kJ/mol when measured by ammonia flowing gas microcalorimetry. Also, a method for purifying gas produced from the gasification of carbonaceous materials, comprising the step of bringing the gas into contact with such mixed oxides or mixed hydroxides.Type: ApplicationFiled: August 22, 2011Publication date: August 22, 2013Applicants: VALTION TEKNILLINEN TUTKIMUSKESKUS, MAGNESIUM ELEKTRON LIMITEDInventors: Hazel Stephenson, Heather Bradshaw, Pekka Simell, Anu Solla, Ella Ronkkonen, Outi Krause
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Publication number: 20130174739Abstract: This invention relates to the utilization of regenerable water tolerant solid materials for the abatements of CO2 emissions from internal combustion engine exhaust streams through repetitive sorption/desorption cycles. The system, which is designed to be used in a gasoline, lean gasoline, diesel passenger car, diesel truck, stationary engine with 50 Hz or 60 Hz electrical frequency, or a SOFC, will contain a solid sorbent which contains zirconium and will be able to reduce on board the average carbon emissions by up to 10 wt %. The preferred materials have been selected from the class of hydrotalcite type compounds and/or earth and alkaline earth zirconates.Type: ApplicationFiled: September 19, 2011Publication date: July 11, 2013Applicant: MAGNESIUM ELEKTRON LIMITEDInventors: Emiliana Mariana Dvininov, Hazel Stephenson
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Publication number: 20100247411Abstract: Compositions useful for treating exhaust gases contain zirconium, titanium and tungsten oxides, and optionally the oxide of an element M selected from among silicon, aluminum, iron, molybdenum, manganese, zinc, tin, and rare earths in the following mass proportions of these different elements: titanium oxide: 20%-50%; tungsten oxide: 1%-20%, M-element oxide: 1%-20%; the balance being zirconium oxide; such compositions are prepared by placing in a liquid medium a zirconium compound, a titanium compound, optionally an M-element compound and a basic compound, adding a tungsten compound to the precipitate suspension thus obtained and having a pH value ranging from 1 to 7, maturing the suspension resulting from the preceding step, and optionally separating the precipitate and calcining same.Type: ApplicationFiled: October 19, 2007Publication date: September 30, 2010Applicants: RHODIA OPERATIONS, MAGNESIUM ELEKTRON LIMITEDInventors: Olivier Larcher, Emmanuel Rohart, Stephan Verdier, Heather Bradshaw, Clive Butler, Deborah Harris, Mairead Feeley, Hazel Stephenson
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Patent number: 7794687Abstract: This invention relates to an improved amorphous zirconium hydroxide and a method for its production. The hydroxide has a surface area of at least 300 m2/g, a total pore volume of at least 0.70 cm3/g and an average pore size of between 5 nm and 15 nm, and is prepared by a process which comprises the steps of: a) preparing an aqueous solution comprising sulphate anions and a zirconium salt such that the ZrO2:SO3 ratio is 1:0.40 to 1:0.52, (b) chilling the solution to below 25° C., (c) adding an alkali in order to precipitate the amorphous zirconium hydroxide, (d) filtering and washing the precipitated zirconium hydroxide with water or an alkali to remove residual sulphate and chloride, (e) hydrothermally treating the zirconium hydroxide at a pressure of less than 3 barg, and (f) drying the zirconium hydroxide. The zirconium hydroxide of the present invention, which can be doped, is particularly useful in catalytic applications.Type: GrantFiled: January 24, 2007Date of Patent: September 14, 2010Assignee: Magnesium Elektron LimitedInventors: Heather Bradshaw, Clive Butler, Hazel Stephenson
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Patent number: 7744845Abstract: A process is disclosed for the preparation of lithium zirconate and doped lithium zirconates for use as regenerable carbon dioxide sorbants by wet mixing zirconium hydroxide with lithium carbonate and then calcining the mixture. Due to the improved physical properties resulting from the disclosed preparation process, the lithium zirconates produced by this process are capable of absorbing carbon dioxide at high rates and in large amounts.Type: GrantFiled: August 25, 2006Date of Patent: June 29, 2010Assignee: Magnesium Elektron LimitedInventor: Hazel Stephenson
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Publication number: 20090005239Abstract: This invention relates to an improved amorphous zirconium hydroxide and a method for its production. The hydroxide has a surface area of at least 300 m2/g, a total pore volume of at least 0.70 cm3/g and an average pore size of between 5 nm and 15 nm, and is prepared by a process which comprises the steps of: a) preparing an aqueous solution comprising sulphate anions and a zirconium salt such that the ZrO2:SO3 ratio is 1:0.40 to 1:0.52, (b) chilling the solution to below 25° C., (c) adding an alkali in order to precipitate the amorphous zirconium hydroxide, (d) filtering and washing the precipitated zirconium hydroxide with water or an alkali to remove residual sulphate and chloride, (e) hydrothermally treating the zirconium hydroxide at a pressure of less than 3 barg, and (f) drying the zirconium hydroxide. The zirconium hydroxide of the present invention, which can be doped, is particularly useful in catalytic applications.Type: ApplicationFiled: January 24, 2007Publication date: January 1, 2009Applicant: MAGNESIUM ELEKTRON LIMITEDInventors: Heather Bradshaw, Clive Butler, Hazel Stephenson
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Publication number: 20080226542Abstract: A process is disclosed for the preparation of lithium zirconate and doped lithium zirconates for use as regenerable carbon dioxide sorbants by wet mixing zirconium hydroxide with lithium carbonate and then calcining the mixture. Due to the improved physical properties resulting from the disclosed preparation process, the lithium zirconates produced by this process are capable of absorbing carbon dioxide at high rates and in large amounts.Type: ApplicationFiled: August 25, 2006Publication date: September 18, 2008Applicant: MAGNESIUM ELEKTRON LIMITEDInventor: Hazel Stephenson