US 11,813,600 B2
Method for preparation gaseous-nitridation treated or liquid-nitridation treated core-shell catalyst
Gu-gon Park, Daejeon (KR); Eun-jik Lee, Daejeon (KR); Dong-chul Park, Daejeon (KR); Sung-dae Yim, Daejeon (KR); Chang-soo Kim, Incheon (KR); Won-yong Lee, Daejeon (KR); Tae-hyun Yang, Daejeon (KR); Seok-hee Park, Daejeon (KR); Min-jin Kim, Daejeon (KR); Young-jun Sohn, Daejeon (KR); Byung-chan Bae, Daejeon (KR); Seung-gon Kim, Daejeon (KR); Dong-won Shin, Sejong-si (KR); and Hwan-yeong Oh, Daejeon (KR)
Assigned to KOREA INSTITUTE OF ENERGY RESEARCH, Daejeon (KR)
Appl. No. 16/767,721
Filed by KOREA INSTITUTE OF ENERGY RESEARCH, Daejeon (KR)
PCT Filed Jul. 5, 2018, PCT No. PCT/KR2018/007665
§ 371(c)(1), (2) Date May 28, 2020,
PCT Pub. No. WO2019/107693, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 10-2017-0162255 (KR), filed on Nov. 29, 2017; and application No. 10-2017-0162256 (KR), filed on Nov. 29, 2017.
Prior Publication US 2020/0346199 A1, Nov. 5, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 37/02 (2006.01); H01M 4/90 (2006.01); B01J 23/755 (2006.01); B01J 35/02 (2006.01); B01J 21/18 (2006.01); B01J 23/42 (2006.01); B01J 23/75 (2006.01); B01J 23/89 (2006.01); B01J 35/00 (2006.01); B01J 37/08 (2006.01); B01J 37/16 (2006.01); B01J 37/34 (2006.01); H01M 4/92 (2006.01)
CPC B01J 37/0221 (2013.01) [B01J 21/18 (2013.01); B01J 23/42 (2013.01); B01J 23/75 (2013.01); B01J 23/755 (2013.01); B01J 23/892 (2013.01); B01J 23/8913 (2013.01); B01J 35/002 (2013.01); B01J 35/008 (2013.01); B01J 35/0013 (2013.01); B01J 35/02 (2013.01); B01J 37/08 (2013.01); B01J 37/16 (2013.01); B01J 37/343 (2013.01); H01M 4/92 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for preparing a liquid-nitridation treated core-shell catalyst, the method comprising the steps of:
irradiating ultrasonic waves to a solution including liquid-urea as a nitrogen source, a reducing solvent, a noble metal precursor, a transition metal precursor and a carbon support at 150 to 200° C.; and
forming a cavity and forming transition metal precursor core and noble metal precursor shell particles due to a difference in vapor pressures while nitridation treating the transition metal precursor by combining with liquid-urea, to prepare a core-shell catalys, wherein
a nitrogen atom is maintained in a molar ratio 10.5 to 41.1 moles per 58.9 to 89.5 moles of the transition metal,
an average particle diameter of the prepared core-shell catalyst is 4.0 nm or less,
the transition metal precursor is at least one kind selected from the group consisting of an acethylacetonate precursor of the transition metal and a hexafluoroacetylacetonate precursor of the transition metal,
the noble metal precursor is at least one kind selected from the group consisting of an acetylacetonate precursor of the noble metal, a hexafluoroacetylacetonate precursor of the noble metal and pentafluoroacetylacetonate precursor of the noble metal, and
the reducing solvent has a reducing power at a high temperature of 70° C. or higher, and is at least one kind of ethylene glycols selected from the group consisting of di-ethylene glycol, tri-ethylene glycol and poly-ethylene glycol.