Enhancement in nickel-silica interface generation by surfactant-assisted melt-infiltration: Surfactant selection and application in CO2 hydrogenation

Eui Hyun Cho, Min Jae Kim, Byung Sun Yoon, Yong Jae Kim, Dahye Song, Kee Young Koo, Unho Jung, Sang Goo Jeon, Young Kwon Park, Chang Hyun Ko

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Effective nickel-based catalysts used in CO2 methanation require high loadings (∼40 wt%) of nanoscale (∼10 nm) nickel particles. However, particle loading and size are inversely proportional. Surfactant-assisted melt-infiltration (SAMI) may alleviate this problem. In this study, various solid surfactants (Span60, SDBS, and CTAB) were homogeneously mixed with nickel nitrate and mesoporous silica support (SBA-15) under non-solvent conditions during melt-infiltration. The non-ionic surfactant (Span60) afforded a high loading (40 wt%) of nanoscale (11 nm) nickel particles and generated a large number of interfaces between the nickel particles and the support. These interfaces may contain oxygen vacancies that facilitate the adsorption–dissociation of CO2 on the catalyst surface. The Span60/40Ni/as-syn-SBA-15 catalyst exhibited the highest catalytic activity with CO2 conversion of 78 % and CH4 selectivity of 99 % at a temperature of 350 ℃ (Space Velocity: 120,000 mL/ gcat·h). The nanoscale size of the catalyst improved the catalytic performance by ensuring a simple and efficient reaction pathway. The SAMI method generates no liquid waste and may be commercialized to produce efficient catalysts.

Original languageEnglish
Article number135166
JournalChemical Engineering Journal
Volume437
DOIs
StatePublished - 1 Jun 2022

Keywords

  • CO hydrogenation
  • Nickel-silica interface
  • Non-ionic surfactant
  • Oxygen vacancy
  • Surfactant-assisted melt-infiltration

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