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US 11,760,653 B2Granted
Acidic zirconium hydroxide
AssigneeMagnesium Elektron Limited
InventorsHazel Stephenson, Iryna Chepurna, Deborah Jayne Harris, David Scapens
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AssigneeMagnesium Elektron Limited
InventorsHazel Stephenson, Iryna Chepurna, Deborah Jayne Harris, David Scapens
Estimating the term…
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. The invention also relates to a process for preparing zirconium hydroxide, the process comprising the steps of:(a) dissolving a zirconium salt in an aqueous acid, (b) addingone or more complexing agents to the resulting solution or sol, the one or more complexing agents being an organic compound comprising at least one of the following functional groups: an amine, an organosulphate, a sulphonate, a hydroxyl, an ether or a carboxylic acid group, (c) heating the solution or sol formed in step (b), (d) adding a sulphating agent, and (e) adding a base to form a zirconium hydroxide, and (f) optionally adding a dopant.
A zirconium hydroxide comprising, on an oxide basis, less than 0.1 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 zirconium hydroxide is porous and, in relation to the pores having a pore diameter of up to 155 nm, at least 70% of the pore volume provided by pores having a pore diameter of 3.5-155 nm as measured using the BJH method.
A zirconium oxide comprising at least 99 w t% zirconium oxide including hafnium oxide or hydroxide impurity and, on an oxide basis, less than 0.1 wt % of a dopant comprising one or more of silicon, sulphate, phosphate, tungsten, niobium, aluminium, molybdenum, titanium, tin or a rare earth metal, and having acid sites, having a total pore volume as measured by N2 physisorption of at least 0.10 cm3/g after calcination at 900° C. in an air atmosphere for 2 hours.
A zirconium oxide comprising at least 99 wt % zirconium oxide including hafnium oxide or hydroxide impurity and, on an oxide basis, less than 0.1 wt % of a dopant comprising one or more of silicon, sulphate, phosphate, tungsten, niobium, aluminium, molybdenum, titanium, tin or a rare earth metal, and having acid sites, having at least 80 wt % of monoclinic phase as measured by XRD after calcination at 450° C. in an air atmosphere for 2 hours, having a CO2 uptake of at least 14 μmol/g at 400-600° C. as measured by TPD after calcination at 600° C. for 2 hours.
A doped zirconium hydroxide comprising, on an oxide basis, 0.1-30 wt % of a sulphate, having acid sites, having a surface area of at least 375m2/g and having a total pore volume as measured by N2 physisorption of at least 0.60 cm3/g.
A doped zirconium hydroxide comprising, on an oxide basis, 0.1-30 wt % of a tungsten hydroxide or oxide, having acid sites and having a surface area of at least 400 m2/g.
A zirconium oxide comprising at least 99wt% zirconium oxide including hafnium oxide or hydroxide impurity and, on an oxide basis, less than 0.1 wt % of a dopant comprising one or more of silicon, sulphate, phosphate, tungsten, niobium, aluminium, molybdenum, titanium, tin or a rare earth metal, and having acid sites, having a CO2 uptake of at least 14 μmol/g at 400-600° C. as measured by TPD after calcination at 600° C. for 2 hours.
Dependencies are inferred from the claim text.