TY - JOUR

T1 - Tetraalkylammonium Salts of Platinum Nitrato Complexes

T2 - Isolation, Structure, and Relevance to the Preparation of PtO x /CeO 2 Catalysts for Low-Temperature CO Oxidation

AU - Vasilchenko, Danila

AU - Topchiyan, Polina

AU - Berdyugin, Semen

AU - Filatov, Evgeny

AU - Tkachev, Sergey

AU - Baidina, Iraida

AU - Komarov, Vladislav

AU - Slavinskaya, Elena

AU - Stadnichenko, Andrey

AU - Gerasimov, Evgeny

N1 - Publisher Copyright: © 2019 American Chemical Society.

PY - 2019/5/6

Y1 - 2019/5/6

N2 - A series of tetraalkylammonium salts with anionic platinum nitrato complexes (Me 4 N) 2 [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] (1), (Et 4 N) 2 [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] (2), (n-Pr 4 N) 2 [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] (3b), (n-Pr 4 N) 2 [Pt(NO 3 ) 6 ] (3a), and (n-Bu 4 N) 2 [Pt(NO 3 ) 6 ] (4) were isolated from nitric acid solutions of [Pt(H 2 O) 2 (OH) 4 ] in high yield. The structures of salts 2, 3a, 3b, and 4, prepared for the first time, were characterized by X-ray diffraction. The sorption of [Pt(NO 3 ) 6 ] 2- and [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] 2- complexes onto the ceria surface from acetone solutions of salts 4 and 1 was examined. The dimeric anion was shown to quickly and irreversibly chemisorb onto the CeO 2 carrier, selectively transforming into Pt(II) centers after thermal treatment, becoming active in the low-temperature CO oxidation reaction (T 50% = 110 °C at a space velocity of 240 000 h -1 ). By contrast, the homoleptic complex [Pt(NO 3 ) 6 ] 2- did not interact with the ceria, which may be attributed to the substitutional inertness of the [Pt(NO 3 ) 6 ] 2- anion. We believe that the strategy based on the sorption of polynuclear platinum nitrato complexes is an effective route to prepare ionic platinum species uniformly distributed on an oxide carrier for various catalytic applications.

AB - A series of tetraalkylammonium salts with anionic platinum nitrato complexes (Me 4 N) 2 [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] (1), (Et 4 N) 2 [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] (2), (n-Pr 4 N) 2 [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] (3b), (n-Pr 4 N) 2 [Pt(NO 3 ) 6 ] (3a), and (n-Bu 4 N) 2 [Pt(NO 3 ) 6 ] (4) were isolated from nitric acid solutions of [Pt(H 2 O) 2 (OH) 4 ] in high yield. The structures of salts 2, 3a, 3b, and 4, prepared for the first time, were characterized by X-ray diffraction. The sorption of [Pt(NO 3 ) 6 ] 2- and [Pt 2 (μ-OH) 2 (NO 3 ) 8 ] 2- complexes onto the ceria surface from acetone solutions of salts 4 and 1 was examined. The dimeric anion was shown to quickly and irreversibly chemisorb onto the CeO 2 carrier, selectively transforming into Pt(II) centers after thermal treatment, becoming active in the low-temperature CO oxidation reaction (T 50% = 110 °C at a space velocity of 240 000 h -1 ). By contrast, the homoleptic complex [Pt(NO 3 ) 6 ] 2- did not interact with the ceria, which may be attributed to the substitutional inertness of the [Pt(NO 3 ) 6 ] 2- anion. We believe that the strategy based on the sorption of polynuclear platinum nitrato complexes is an effective route to prepare ionic platinum species uniformly distributed on an oxide carrier for various catalytic applications.

KW - RAY PHOTOELECTRON-SPECTROSCOPY

KW - METAL-SUPPORT INTERACTION

KW - MOLECULAR-ORBITAL METHODS

KW - CARBON-MONOXIDE

KW - PT/CEO2 CATALYSTS

KW - NANOPARTICLES

KW - IMPLEMENTATION

KW - POTENTIALS

KW - ABSORPTION

KW - MORPHOLOGY

UR - http://www.scopus.com/inward/record.url?scp=85064355406&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/70023f9f-0eed-30a2-8aeb-c323f946a81d/

U2 - 10.1021/acs.inorgchem.9b00370

DO - 10.1021/acs.inorgchem.9b00370

M3 - Article

C2 - 30951300

AN - SCOPUS:85064355406

VL - 58

SP - 6075

EP - 6087

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

IS - 9

ER -