Effect of unpaired electron number elements (Al, Cr, Mn) doping in Fe2O3 on ortho to para hydrogen conversion at 77 K

Xu, Hong; Wang, Jiawei; Han, Yisong; Xue, Mingzhe; Zhang, Cunman

doi:10.1016/j.est.2023.109512

Cited by 5 publications

(2 citation statements)

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“…Notably, there is a positive correlation between the specific surface area (also pore volume) and the activity of o – p H 2 conversion, indicating the critical roles played by both pore volume and specific surface area in improving o – p H 2 conversion. It is believed that combination of high specific surface area and large pore volume is particularly advantageous for catalytic reactions, which provides abundant catalytically active sites and facilitates the diffusion of H 2 within the channels, thereby reducing the distance between H 2 molecules and active sites . To support this conclusion, the H 2 adsorption capacities of the as-synthesized catalysts were then determined by intelligent gravimetric analyzer (Figure S7), which provides direct evidence for the above conclusion.…”

Section: Resultsmentioning

confidence: 81%

“…To this end, numbers of catalysts have been prepared and studied aimed at addressing the challenges associated with the safe storage of liquid hydrogen, encompassed by Fe–Ni alloys, Ni MOF, Fe(OH) 3 , Fe 2 O 3 , Cr 2 O 3 , and activated carbon. − Iron-based catalysts stand out among these catalysts due to their advantageous characteristics of low cost, stable performance, and ease of preparation. Consequently, research has been dedicated to iron-based catalysts for o – p H 2 conversion.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Structural Factors in Iron Oxide Triggering Ortho–Para Hydrogen Conversion

Yue,

Wang,

Wang

et al. 2024

J. Phys. Chem. C

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The ortho−para hydrogen (o−p H 2 ) conversion is an essential intensification process for the liquefaction, storage, and transportation of H 2 , which is highly desired for harnessing liquid hydrogen. Iron-based catalysts have been demonstrated as the most promising candidates for o−p H 2 conversion because of their inexpensive and stable catalytic properties; however, the reactive active sites and catalytic mechanism remain hitherto unclear. In this contribution, a series of γ-Fe 2 O 3 nanoparticles were prepared via a simple thermal treatment process and thoroughly characterized for exploring their structure−function relationship as o−p H 2 conversion catalysts. A tremendous increased reaction rate constant for o−p H 2 conversion was achieved using Fe 2 O 3 -2 as a catalyst, which is 2 orders of magnitude higher than that of the pristine γ-Fe 2 O 3 . Results from Mossbauer measurements demonstrated a positive correlation between the Fe 3+ in the tetrahedral-site (A-site) and the o−p H 2 conversion performance. Additionally, the higher saturation magnetization, pore volume, and specific surface area were also demonstrated to be critical for o−p H 2 conversion. Our work provides an in-depth insight into the key structural factors in iron oxide triggering o−p H 2 conversion, which shall pave the way toward the design of novel efficient catalysts for practical application.

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Section: Resultsmentioning

confidence: 81%