biostudies-literatureKim KDthe National Research Council of Science & Technology(NST) grant by the Korea government (MSIT)Research and Development Program of the Korea Institute of Energy ResearchKorea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Koreae2407338https://www.ebi.ac.uk/biostudies/studies/S-EPMC12019907biostudies-literatureUnknown21(16)Herein, a B<sub>5</sub>-site-rich Ru/MgAl<sub>2</sub>O<sub>4</sub> nanocatalyst for the production of CO<sub>x</sub>-free hydrogen from ammonia (NH<sub>3</sub>) is synthesized using the polyol method. The polyol method enables size-sensitive Ru-nanoparticle growth and controlled B<sub>5</sub>-site formation on the catalyst by tuning the carbon-chain length of the polyol solvent used, obviating the use of a separate stabilizer and enhancing electron donation from Ru (with a high surface electron density) and π-back bonding. The Ru/MgAl<sub>2</sub>O<sub>4</sub> (BG) catalyst synthesized using butylene glycol (a long-carbon-chain solvent) contains 2.5 nm Ru particles uniformly dispersed on its surface and abundant B<sub>5</sub> sites at (0 0 2)/(0 1 1). Moreover, the Ru/MgAl<sub>2</sub>O<sub>Small (Weinheim an der Bergstrasse, Germany)Polyol-Intermediated Facile Synthesis of B<sub>5</sub>-Site-Rich Ru-Based Nanocatalysts for CO<sub>x</sub>-Free Hydrogen Production via Ammonia Decomposition.PMC12019907GTL24051-400C4-249020213030040550Yi KBAn BSShin JHPark YJung UKoo KYKim JKim KDfalsePolyol-Intermediated Facile Synthesis of B<sub>5</sub>-Site-Rich Ru-Based Nanocatalysts for CO<sub>x</sub>-Free Hydrogen Production via Ammonia Decomposition.Herein, a B<sub>5</sub>-site-rich Ru/MgAl<sub>2</sub>O<sub>4</sub> nanocatalyst for the production of CO<sub>x</sub>-free hydrogen from ammonia (NH<sub>3</sub>) is synthesized using the polyol method. The polyol method enables size-sensitive Ru-nanoparticle growth and controlled B<sub>5</sub>-site formation on the catalyst by tuning the carbon-chain length of the polyol solvent used, obviating the use of a separate stabilizer and enhancing electron donation from Ru (with a high surface electron density) and π-back bonding. The Ru/MgAl<sub>2</sub>O<sub>4</sub> (BG) catalyst synthesized using butylene glycol (a long-carbon-chain solvent) contains 2.5 nm Ru particles uniformly dispersed on its surface and abundant B<sub>5</sub> sites at (0 0 2)/(0 1 1). Moreover, the Ru/MgAl<sub>2</sub>O<sub>2025-01-01T00:00:00Z2025 Apr2025-07-06T03:04:28.906Z2025-07-06T03:04:28.906ZS-EPMC120199073962385910.1002/smll.202407338