US 11,896,968 B2
Lanthanide-doped layered double hydroxides and method of producing same
Elena Mihaela Seftel, Mol (BE); Bart Michielsen, Mol (BE); Steven Mullens, Mol (BE); Pegie Cool, Wilrijk (BE); and Vera Meynen, Wilrijk (BE)
Assigned to VITO NV, Mol (BE); and UNIVERSITEIT ANTWERPEN, Antwerp (BE)
Appl. No. 16/955,740
Filed by VITO NV, Mol (BE); and UNIVERSITEIT ANTWERPEN, Antwerp (BE)
PCT Filed Dec. 21, 2018, PCT No. PCT/EP2018/086734
§ 371(c)(1), (2) Date Jun. 18, 2020,
PCT Pub. No. WO2019/122398, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. 17209942 (EP), filed on Dec. 22, 2017.
Prior Publication US 2020/0325031 A1, Oct. 15, 2020
Int. Cl. B01J 37/03 (2006.01); B01J 20/04 (2006.01); B01J 20/30 (2006.01); B01J 27/236 (2006.01); B01J 37/04 (2006.01); C02F 1/28 (2023.01); C01F 7/785 (2022.01); C01F 7/784 (2022.01); C02F 101/20 (2006.01); C02F 103/16 (2006.01)
CPC B01J 37/031 (2013.01) [B01J 20/043 (2013.01); B01J 20/3085 (2013.01); B01J 27/236 (2013.01); B01J 37/033 (2013.01); B01J 37/04 (2013.01); C01F 7/784 (2022.01); C01F 7/785 (2022.01); C02F 1/288 (2013.01); C01P 2002/22 (2013.01); C01P 2002/54 (2013.01); C01P 2002/72 (2013.01); C01P 2002/77 (2013.01); C01P 2002/82 (2013.01); C01P 2004/03 (2013.01); C02F 1/281 (2013.01); C02F 2101/20 (2013.01); C02F 2103/16 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for producing lanthanide doped layered double hydroxides (Ln-doped LDHs), the method comprising:
a) preparing a carbonate free alkaline solution;
b) preparing a solution of metal salts comprising a salt of a lanthanide;
c) adding the alkaline solution and the solution of metal salts to form a mixture, wherein a speed of adding the alkaline solution or of adding the solution of metal salts is set such that a pH of the mixture is maintained at a constant value so as to form Ln-doped LDH precipitate;
d) aging the precipitate; and
e) separating the precipitate from the mixture;
wherein the carbonate free alkaline solution is an aqueous ammonia solution; and
wherein the lanthanide doped layered double hydroxides have a crystal structure having a unit cell with lattice parameter a110 at least 1.6% larger than lattice parameter a110 of a unit cell of the crystal structure of layered double hydroxides that are not lanthanide doped.