Correlation of activity in cyclohexane dehydrogenation reaction and adsorption properties relative to hydrogen, Fd-Co/Al2O3 and Pt-Co/Al2O3 catalysts

Low-temperature graphene growth using epochal catalyst of PdCo alloy

“…The fact that the decomposition rate of hydrocarbon gases is high below 400 C and low above 400 C (Ref. 16) is strongly corroborated with the current observation of large lattice constant at 400 C and furthermore, the change of D/G intensity ratio observed in Fig. 1(a).…”

“…Interestingly, D/G intensity ratio was reduced and G'/G intensity ratio was not degraded much, as the temperature decreased. This is related to the alloy catalyst efficiency at low temperature that dehydrogenation takes place more easily at lower temperatures of 300-500 C. 16 On the other hand, no characteristic peaks were observed at 400 C in the case of Ni catalyst, although D/G intensity ratio increased as the temperature decreased. No appreciable G' band intensity was visible even at 500 C. This demonstrates the efficiency of PdCo alloy catalyst in synthesizing graphene layers at low temperature.…”

“…14,15 Furthermore, the dehydrogenating capability of PdCo catalyst has been investigated at atmospheric pressure at low temperature (300-500 C). 16 Although the melting temperature of PdCo alloy is not reduced much, the melting temperature of graphite/PdCo alloy is expected to be low to form liquid metal state at low growth temperature. Here, we report low temperature synthesis of graphene layers using PdCo alloy as a catalytic layer which can be activated at low temperature ($400 C) with radio frequency plasmaenhanced chemical vapor deposition (RF PECVD).…”

“…16 Ni catalyst of 300 nm in thickness on SiO 2 (300 nm)/Si substrate was also used for comparison. Synthesis of graphene was carried out in a PECVD.…”