Alkali-assisted synthesis of ultrafine NiPt nanoparticles immobilized on La2O2CO3 for highly efficient dehydrogenation of hydrous hydrazine and hydrazine borane

• Published in: Catalysis today Vol. 400-401; pp. 49 - 58
• Main Authors: Yao, Qilu, Long, Jianjun, Yang, Kangkang, Li, Xiugang, Huang, Bin, Chen, Xiangshu, Lu, Zhang-Hui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2022
• Subjects: Catalysis; Hydrazine borane; Hydrogen evolution; Hydrous hydrazine; Nanoparticles; Nanoparticles; Hydrous hydrazine; Catalysis; Hydrogen evolution; Hydrazine borane
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2021.11.023

Designing highly active and selective metal nanocatalysts for use in liquid chemical hydrides is highly attractive but remains a critical challenge. Herein, bimetallic NiPt nanoparticles (NPs) immobilized on lanthanum oxycarbonate (NiPt/La2O2CO3) have been facilely synthesized via an alkali-assisted reduction method. The introduction of NaOH is the key factor to the formation of the well-dispersed and ultrafine NiPt NPs (2.8 nm). The obtained Ni0.6Pt0.4/La2O2CO3 exhibits an extraordinarily high catalytic activity and 100% H2 selectivity for hydrous hydrazine dehydrogenation, providing a turnover frequency value (TOF) high up to 490 h−1 at 298 K. Additionally, the NiPt/La2O2CO3 prepared with NaOH demonstrates higher catalytic performance and lower activation energy than that of NiPt/La2O2CO3_N prepared without NaOH. Moreover, the NiPt/La2O2CO3 also shows an outstanding catalytic efficiency (TOF = 1200 h−1) for dehydrogenation of hydrazine borane at 298 K. The efficient catalytic performance may be attributed to the small size effect, the strong metal-support interaction, and the NaOH promotion effect. This alkali-assisted reduction method provides a new perspective for preparing of highly efficient catalysts in clean energy application. [Display omitted] Ultrafine bimetallic NiPt nanoparticles immobilized on lanthanum oxycarbonate (NiPt/La2O2CO3) have been facilely synthesized via an alkali-assisted reduction approach and applied as highly selective and efficient catalyst for hydrogen evolution from hydrous hydrazine and hydrazine borane. •NiPt NPs anchored on La2O2CO3 were prepared via an alkali-assisted reduction method.•NiPt/La2O2CO3 possessed smaller particle size and higher surface area.•NiPt/La2O2CO3 showed much higher catalytic activity than that of NiPt/La2O2CO3-N.•TOF values for N2H4 and N2H4BH3 dehydrogenation are 490 and 1200 h−1, respectively.