Kinetics of the methanation of CO and CO2 on a nickel catalyst

Kinetic studies of CO 2 methanation over a Ni/ γ -Al 2 O 3 catalyst using a batch reactor

“…NWP was thus 0.09, much smaller than the value at which intra-particle mass transfer is important. Furthermore, the apparent activation energy, as discussed later, was 95 ± 10 kJ mol -1 , which is in agreement with previous investigations of CO2 methanation (Weatherbee and Bartholomew, 1982;van Herwijnen et al, 1973). If significant intraparticle mass transfer had been present, the apparent activation energy would have been significantly smaller.…”

“…Only a few previous studies have proposed rate expressions for the methanation of CO2 (e.g. Weatherbee and Bartholomew, 1982;van Herwijnen et al, 1973). The conclusions of these researchers were based on experiments which were performed on continuous, flow reactors.…”

Kinetic studies of the methanation of CO over a Ni/γ-Al2O3 catalyst using a batch reactor

“…Schematic diagram of reaction mechanisms for CO methanation (i) via the dissociative adsorption of CO, (ii) via an enol intermediate. Vannice (1975), van Herwijnen et al (1973) and Huang and Richardson (1977) proposed rate expressions consistent with mechanism (ii). catalyst, under operando conditions in an IR cell.…”

Development of Methanation Catalysts for the Synthetic Natural Gas Processes

“…Many reports discussed the inhibition of C02 methanation by CO (6,9,12,20,21,22,23). At 160°C and 300 psig, there is indication that as little as 65 ppm CO would stop C02 methanation (12).…”

“…Several studies (9,10,12) show that above 204°C pore diffusion will control catalyst activity if the particle diameter is > 0.02-0.03 in. This is far smaller than the particle diameter of any practical commercial catalyst.…”