CO₂Reforming of CH₄over Co/Oxidized Diamond Catalyst

Abstract

We examined synthesis gas (H 2 and CO) production from CO 2 reforming of methane using a Co/oxidized diamond catalyst to investigate the properties of oxidized diamond as a support material and as a way to avoid carbon deposition on cobalt-loaded catalysts. Oxidized diamond showed a good catalytic performance among various support materials. No carbon deposition was observed when using the Co/oxidized diamond catalyst in CO 2 reforming of CH 4 . In addition, CH 4 conversion was maintained for 10 h during CO 2 reforming of CH 4 over the Co/oxidized diamond catalyst. In the CO 2 reforming of CH 4 , active cobalt species might be formed or deposited carbon would be rapidly eliminated on oxidized diamond-supported catalyst.

Effects of Platinum and Palladium Metals on Ni/Mg1-xZrxO Catalysts in the CO2 Reforming of Methane

“…In this mechanism, the reaction between a molecule of methane and Ni surface (Nickel has the best conversion among other metals due to its size and high density of posi-tive charge [10] ) produced desorbed hydrogen and hydrocarbon species CHx (x = 0-4); when x=0, carbon deposits on the Ni metal surface [35]. Equations 10-14 are shown below: CH4 + 2Ni(as)  CH3Ni(as) + HNi(as) (10) CH3Ni(as) + Ni(as)  CH2NI(as) + HNi(as) (11) CH2Ni(as) + Ni(as)  CHNi(as) + HNi(as) (12) CHNi(as) + Ni(as)  CNi(as) + HNi(as) (13) 2HNi(as)  H2 + 2Ni(as) (14) (as) metal active site Nakamura et al [36] described the effects of a promoter on the catalyst during the DRM through an increase in the dispersion of Pt, Pd, and Ni. One of the effects was the activation of carbon dioxide on the support-promoter that had been mixed with the metal particle for the formation of a carbonate species.…”

Catalytic performance of activated carbon supported cobalt catalyst for CO 2 reforming of CH 4

“…As Co loading increases, the catalytic activity of the catalyst increases until the saturation point reached. The micro-porous structure of the carbon surface is blocked when Co loading exceeds the saturation point [12][13][14][15][16][17]. It is not conducive to gas molecule adsorption and activation.…”

“…It is Co and CoAl 2 O 4 that play a very important role in the reaction, and there are many different catalytic features between calcined at high temperature and at low temperature. In summary, Co metal has high catalytic activity, and can form moderately granular crystal after calcination [13][14][15][16][17]. However, the catalyst life is still short.…”

The effects of process parameters on carbon dioxide reforming of methane over Co–Mo–MgO/MWCNTs nanocomposite catalysts

“…Recent advances in the studies have shown that the carbon-based supports such as the activated carbon [13,14], carbon nanotubes (CNTs) [9,[15][16][17], oxidized diamond [18] and coal char [19] could prevent extensive amount of the carbon deposition from the hydrocarbons. Among them, the use of CNTs as the catalyst supports seems to be one of the most promising fields with large economic implications.…”