Preparation Of Ni/mgo Catalyst Using Dielectric-barrier Discharge Plasma For CO₂ Reforming Of Methane

With the depleting of oil resource and the adjustment of the energy structure in the world, the utilization of natural gas resources, whose main component is methane, is becoming increasingly important. Currently, three of the most frequently used methods to convert methane to synthesis gas are steam reforming of methane (SRM), partial oxidation of methane (POM) and CO₂ reforming of methane (CRM), among which SRM is the dominant one carried out in the industry. However, there are also several drawbacks with SRM, for example, intense energy input during production and unsuitable CO/H₂ ratio for the later synthesis of various chemicals. Compared with SRM and POM, CRM provides an effective route for coinstantaneous conversion of the two green house gases, CO₂ and CH4, into valuable products with a suitable CO/H₂ ratio for methane syntheses. Therefore, it is of great importance to investigate this reaction.In this paper, we applied dielectric-barrier discharge plasma technique to the preparation of Ni/MgO catalyst for CRM. It is demonstrated that catalyst prepared via DBD plasma (P-Ni/MgO) shows much higher catalytic activity and can maintain good catalytic performance for as long as 100 h at either 700 ?C or 750 ?C. TPO profiles of the catalyst show that P-Ni/MgO also has excellent coke resistant performance. We find that the plasma treatment has significant influence on the structure and property of the catalyst. TPR results verify that the interaction between Ni particles and MgO support is much stronger in P-Ni/MgO. What's more, various characterizations illustrate that the hemispheric Ni particles on the surface of P-Ni/MgO also has smaller size, flatter morphology, and larger contact area with the MgO support. These properties can not only improve the catalytic activity of the catalyst, but also contribute a lot to increase the coke resistance performance and anti-sintering ability.