Process optimization of DBD plasma dry reforming of methane over Ni/La2O3[sbnd]MgAl2O4 using multiple response surface methodology

Asif Hussain Khoja, Muhammad Tahir, Nor Aishah Saidina Amin

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

In this study, 10% Ni/La2O3[sbnd]MgAl2O4 nano-flake catalyst was synthesized, characterized and tested in a catalytic dielectric barrier discharge (DBD)plasma for dry reforming of methane (DRM). With design of experiment (DoE), the influence of process parameters namely (1)total feed flow rate (ml min−1), (2)feed ratio (CO2/CH4), (3)input power (W)and (4)catalyst loading (g)were examined using multiple response surface methodology (RSM)through a four-factor, five-level central composite design (CCD). Second-order regression models were applied for evaluating the interaction between the process parameters and responses. Input power (X3)and total feed flow rate (X1)were the two most influential process parameters followed by catalyst loading (X4)and feed ratio (X2). The experimental and predicted results from the optimum conditions fitted-well with less than ±5% margin of error. The possible dynamic interactions between the process variables were elucidated. The optimum values are feed flow rate = 18.8 ml min−1, feed ratio = 1.05, input power = 125.6 W and catalyst loading = 0.6 g. At these conditions, the predicted CH4 and CO2 conversions are 79.86% and 84.03%, respectively. The H2 and CO yields are predicted as 41.37% and 40.47%, respectively while H2/CO ratio is above unity. The calculated EE from the RSM model is predicted as 0.135 mmol kJ−1. Low carbon deposition observed on the spent catalyst is attributed to the highly basic and oxidative nature of the La2O3 co-supported catalyst.

Original languageEnglish
Pages (from-to)11774-11787
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number23
DOIs
Publication statusPublished - May 3 2019
Externally publishedYes

Keywords

  • Dry reforming of methane
  • MgAlO
  • Plasma-catalysis
  • Process optimization
  • Response surface methodology

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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