Highly dispersed ni nanocatalysts derived from nimnal-hydrotalcites as high-performing catalyst for low-temperature syngas

Bin Lu, Jiahao Zhuang, Jinping Du, Fangna Gu*, Guangwen Xu, Ziyi Zhong, Qing Liu, Fabing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Increasing the low-temperature performance of nickel-based catalysts in syngas methanation is critical but very challenging, because at low temperatures there is high concentration of CO on the catalyst surface, causing formation of nickel carbonyl with metallic Ni and further catalyst deactivation. Herein, we have prepared highly dispersed Ni nanocatalysts by in situ reduction of NiMnAl-layered double hydroxides (NiMnAl-LDHs) and applied them to syngas methanation. The synthesized Ni nanocatalysts maintained the nanosheet structure of the LDHs, in which Ni particles were decorated with MnO y species and embedded in the AlO x nanosheets. It was observed that the Ni nanocatalysts exhibited markedly better low-temperature performance than commercial catalysts in the syngas methanation. At 250 °C, 3.0 MPa and a high weight hourly space velocity (WHSV) of 30,000 mLg -1 h -1 , both the CO conversion and the CH 4 selectivity reached 100% over the former, while those over the commercial catalyst were only 14% and 76%, respectively. Furthermore, this NiMnAl catalyst exhibited strong anti-carbon and anti-sintering properties at high temperatures. The enhanced low-temperature performance and high-temperature stability originated from the promotion effect of MnO y and the embedding effect of AlO x in the catalyst.

Original languageEnglish
Article number282
JournalCatalysts
Volume9
Issue number3
DOIs
StatePublished - Mar 2019

Keywords

  • Low-temperature methanation
  • Ni nanocatalysts
  • NiMnAl-LDHs
  • Nickel carbonyl

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