Optimisation of CH₄ and CO₂ conversion and selectivity of H₂ and CO for the dry reforming of methane by a microwave plasma technique using a Box–Behnken design

Abstract

A microwave plasma was generated by N 2 gas. Synthesis gases (H 2 and CO) were produced by the interaction of CH 4 and CO 2 under plasma conditions at atmospheric pressure. The experimental pilot plant was set up, and the gases were sampled and analysed by gas chromatography-mass spectrometry. The Box-Behnken design (BBD) method was used to find the optimising conditions based on the experimental results. The response surface methodology based on a three-parameter and three-level BBD has been developed to find the effects of independent process parameters, which were represented by the gas flow rates of CH 4 , CO 2 , and N 2 and their effects on the process performance in terms of CH 4 , CO 2 , and N 2 conversion and selectivity of H 2 and CO. In this work, four models based on quadratic polynomial regression have been determined to understand the connection between the limits of the feed gas flow rate and the performance of the process.The results show that the most important factor influencing the CO 2 , CH 4 , and N 2 conversion and the selectivity of H 2 and CO was "CO 2 feed gas flow rate." At the maximum desirable value of 0.92, the optimum CH 4 , CO 2 , and N 2 conversion were 84.91%, 44.40%, and 3.37%, respectively, and the selectivities of H 2 and CO were 51.31% and 61.17%, respectively. This was achieved at a gas feed flow rate of 0.19, 0.38, and 1.49 L min −1 for CH 4 , CO 2 , and N 2 , respectively.

Optimization of Dry Reforming of Methane over a Ni/MgO Catalyst Using Response Surface Methodology

“…Supporting Information for this article can be found under DOI: 10.1002/ceat202200115. This section includes additional references to primary literature relevant for this research 55–78.…”

“…This method is difficult, time-consuming, and may not reflect the actual conditions. The use of statistical methods for optimizing natural gas reforming processes has recently attracted several authors who employed design of experiment (DoE) and response surface methodology (RSM) to investigate the optimum conditions required for obtaining maximum hydrogen and syngas yield from DRM [30][31][32][33][34][35][36][37]. RSM requires fewer experimental runs designed so as to give maximum information about the effect of process parameters on the response variables as well as their interaction.…”

Dry methane reforming with nickel–cobalt bimetallic catalysts based on halloysite nanoclay modified by alkaline melting method

“…Nowadays, global warming has caused unexpected climate behaviors and disrupted the human, animal, and plant ecosystems and has caused irreparable damage to the health and economic life of human beings 1,2 . Global warming has many causes, including natural factors such as solar and volcanic activity and man‐made factors such as mining, deforestation for fossil fuels, and the burning of petroleum products, resulting in increased greenhouse gas emissions.…”

Preparation of cigarette butts/coal‐based porous carbon and its catalytic methane decomposition to hydrogen

“…At present, most of hydrogen comes from steam reforming of fossil fuels, but this process will release a large amount of greenhouse gas carbon dioxide. 6,7 Catalytic methane decomposition (CMD) is an environmentally friendly new technology. In the production process, only hydrogen and nanocarbon are produced, and no carbon dioxide is generated.…”