# Exploring Ortho–Para Hydrogen Conversion Catalysts Based on Surface Electric Field Gradient

https://mdr.nims.go.jp/datasets/753ae947-4a40-45ef-a93b-d290c7e02f1f

## File

- [OPcatal_JPCL2026.pdf](https://mdr.nims.go.jp/filesets/9fcfba23-ff0f-41ad-9050-d9b67f91984c/download) ([Detail](https://mdr.nims.go.jp/filesets/9fcfba23-ff0f-41ad-9050-d9b67f91984c.md))

## Id

753ae947-4a40-45ef-a93b-d290c7e02f1f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-03-26T07:17:23.097877Z

## Updated at

2026-03-27T00:07:48.368252Z

## Published at

2026-03-27T03:22:35.906243Z

## Doi



## First published url

https://doi.org/10.1021/acs.jpclett.6c00357

## Date published

2026-03-26

## Recorded date published

2026-3-26

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Exploring Ortho–Para Hydrogen Conversion Catalysts Based on Surface Electric
    Field Gradient
  title_type: original
  lang: en

## Description

- description: In this communication, we report new oxide catalysts, including SiO2,
    γ-Al2O3, and CeO2 combined with 3d transition metal cocatalysts, which promote
    H2 adsorption, as a result of our exploration based on our hypothesis that an
    inhomogeneous electric field on the surface of the insulating oxide with high
    ionicity promotes OP conversion. The fraction of para-H2 on 5%Fe-loaded SiO2 powder
    reaches the equilibrium value at 77 K within 20 min. The activities of these catalysts
    are several times higher than those of benchmark catalysts such as Mn3O4. We suggest
    a mechanism by which the nuclear spin state of the adsorbed ortho-H2 is thermally
    excited by nuclear quadrupole interactions and the conversion is enhanced through
    nuclear spin relaxation.
  description_type: abstract
  lang: und

## Creator

- name: Hiroshi Mizoguchi
  role: author
  orcid: https://orcid.org/0000-0002-0992-7449
- name: Yuichi Shirako
  role: author
- name: Shusaku Shoji
  role: author
  orcid: https://orcid.org/0000-0002-8481-2633
- name: Hideki Abe
  role: author
  orcid: https://orcid.org/0000-0002-8392-7586
- name: Takeshi Fujita
  role: author
  orcid: https://orcid.org/0000-0002-2318-0433
- name: Hideo Hosono
  role: author
  orcid: https://orcid.org/0000-0001-9260-6728

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: hydrogen
  schema: not_defined
- subject: ortho-para conversion
  schema: not_defined
- subject: catalysts
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

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## Data origin



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## Journal

- title: The Journal of Physical Chemistry Letters
  issn: '19487185'
  article_number: acs.jpclett.6c00357

## Conference



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## Funding

- identifier: JPMJMI18A3
  funder_name: JST-Mirai Program
- identifier: JPMXP1225NM5175
  funder_name: Ministry of Education, Culture, Sports, Science and Technology
- funder_name: JFE 21st Century Foundation
- identifier: 23K23440
  funder_name: Japan Society for the Promotion of Science
- identifier: 24K21813
  funder_name: Japan Society for the Promotion of Science
- funder_name: Iketani Science and Technology Foundation

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## Chemical composition



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## Fileset

- id: 9fcfba23-ff0f-41ad-9050-d9b67f91984c
  filename: OPcatal_JPCL2026.pdf
  content_type: application/pdf
  size: 2507771
  md5: 9b4d14069a66c1b562d99306d5fdacd1

## Thumbnail

fileset_id: 9fcfba23-ff0f-41ad-9050-d9b67f91984c
filename: OPcatal_JPCL2026.pdf