How nitric oxide affects the decomposition of supported nickel nitrate to arrive at highly dispersed catalysts

Jelle R.A. Sietsma, Heiner Friedrich, Alfred Broersma, Marjan Versluijs-Helder, A. Jos van Dillen, Petra E. de Jongh, Krijn P. de Jong

Research output: Contribution to journalArticleAcademicpeer-review

92 Citations (Scopus)

Abstract

An explanation is put forward for the beneficial effect of thermal decomposition of supported Ni3(NO3)2(OH)4 in NO/He flow (0.1-1 vol%) that enables preparation of well-dispersed (3-5 nm particles) 24 wt% Ni-catalysts via impregnation and drying using aqueous [Ni(OH2)6](NO3)2 precursor solution. Moreover, combining electron tomography, XRD and N2-physisorption with SBA-15 support yielded a clear picture of the impact of air, He and NO/He gas atmospheres on NiO shape and distribution. TGA/MS indicated that NO2, N2O, H2O products evolved more gradually in NO/He. In situ XRD and DSC revealed that NO lowers the nitrate decomposition rate and appears less endothermic than in air supposedly due to exothermic scavenging of oxygen by NO, which is supported by MS results. The Ni/SiO2 catalyst prepared via the NO-method displayed a higher activity in the hydrogenation of soybean oil as the required hydrogenation time decreased by 30% compared to the traditionally air calcined catalyst.

Original languageEnglish
Pages (from-to)227-235
Number of pages9
JournalJournal of Catalysis
Volume260
Issue number2
DOIs
Publication statusPublished - 10 Dec 2008
Externally publishedYes

Keywords

  • Calcination
  • Catalysis
  • Catalyst preparation
  • Hydrogenation
  • Metal nitrates
  • Nickel
  • Nitric oxide

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