Temperature-programmed Studies of Coke Resistant Ni Catalyst for Carbon Dioxide Reforming of Methane

Abstract

Argon glow discharge plasma was applied for drying the impregnated Ni/SiO 2 catalyst instead of the drying thermally. Such plasma treated catalyst significantly inhibits the coke formation from methane decomposition.The methane-derived carbon shows an improved reactivity against CO 2 . This can result in a better balance of coke formation and gasification by CO 2 when the plasma-treated Ni/SiO 2 catalyst is used for the CO 2 reforming of methane.

The Use of Non‐Equilibrium Plasmas for the Synthesis of Heterogeneous Catalysts

“…Most often, catalyst are synthesized using (wet/dry) impregnation or (co‐)precipitation which combines several unit operations. It can be useful to add plasma treatment to the standard process to enhance several catalyst properties such as the dispersion and the particle sizes,11, 69–73 but a more interesting approach exists in the replacement of the reduction or calcination step by a plasma treatment 74–80…”

“…Several authors have reported the addition of a plasma treatment step to the catalyst's synthesis procedure. The treatment is most commonly applied before the conventional calcination and is often found to enhance catalytic properties 11, 69–73, 81–86. Several advantages can be obtained by this approach: smaller particle sizes, increased dispersion, and increased activity.…”

“…However, some minor disadvantages compared to noble metal catalysts still remain, like the need for high reaction temperatures for the partial oxidation of methane, and the higher sensitivity to coking during dry reforming, but overall, the low cost, and high activity and selectivity make nickel highly applicable as catalyst for the reforming of methane (Figure 5). 81, 82 Many attempts have been made to overcome the remaining disadvantages associated with nickel, and treatment of the catalyst by plasma proved to be successful for the stability and activity of the catalysts 69, 81–85…”

Characterization of CuO-ZnO Catalyst Prepared by Decomposition of Carbonates Using Dielectric-Barrier Discharge Plasma

“…The novel catalyst preparation has become a hot topic and, in some cases, a challenge to chemists worldwide. Recently, using various plasmas for catalyst preparation has attracted a lot of attentions [2][3][4][5][6][7][8][9][10]. Plasma is a substance in which part of the atoms or molecules are effectively ionized.…”

“…The major progresses have been summarized in the previous review article [12]. The recent researches confirmed that plasmas can be efficiently and effectively applied for the size and shape control of metal or metal oxide nano-particles for catalytic uses [3,4,7]. Especially, argon or air plasma can be directly applied for the reduction of noble metal ions at room temperature [13].…”