The role of catalyst synthesis on the enhancement of nickel praseodymium (III) oxide for the conversion of greenhouse gases to syngas

Osarieme Uyi Osazuwa, Sumaiya Zainal Abidin*, Nurul Asmawati Roslan, Xiaolei Fan, Herma Dina Setiabudi, Dai Viet N. Vo, Jude A. Onwudili

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Catalytic methane (CH4) dry reforming (MDR) reaction proceeds with the formation of carbon; hence the effects of the catalyst preparation method on the type of carbon are worth investigating. This study investigated the performance of 20 wt% nickel praseodymium (III) oxide (20 wt% Ni/Pr2O3) catalysts prepared by incipient wetness impregnation (IWI), ultrasonic wet impregnation (US-WI), and Pechini sol–gel (PSG) methods. The catalysts crystallite size was approximately 21.3 nm, 21.3 nm, and 10.6 nm, for IWI, US-WI, and PSG catalysts, respectively. Study of the temperature effecton the MDR system showed that higher temperatures favored the MDR reaction with the side reaction playing vital roles. The catalyst synthesized by the PSG method showd higher carbon gasification rate with the stability up to 24 h, whereas catalysts from other synthesis methods were only active for less than 2 h, which could be due to the formation of higher amount of filamentous carbon, balance in oxygen species, and the smaller crystallite size of the PSG-20 wt% Ni/Pr2O3. The PSG-20 wt% Ni/Pr2O3 catalyst accumulated more filamentous carbon than graphitic carbon. In contrast, the IWI and US-WI catalysts accumulated mainly graphitic carbon which encapsulated the Ni0 sites, resulting in excess carbon deposition and reactor clogging within 2 h on stream. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1569–1587
JournalClean Technologies and Environmental Policy
Issue number5
Early online date22 Dec 2022
Publication statusPublished - Jul 2023

Bibliographical note

Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature, 2022. This version of the article has been accepted for publication, after peer review and is subject to Springer Nature’s AM terms of use [], but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at:


  • Carbon species
  • Greenhouse gases
  • Methane dry reforming
  • Nickel catalyst
  • Oxygen species
  • Synthesis method


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