Effect of Ca, Ce or K oxide addition on the activity of Ni/SiO2 catalysts for the methane decomposition reaction

Direct decomposition of methane over Pd promoted Ni/SBA-15 catalysts

“…can be attributed to the reduction of NiO, which had a strong interaction with SBA-15 [43]. The 6 strong interaction may be stimulated by the encapsulation of NiO particles in the hexagonal 7 mesopores of SBA-15.…”

Characterization and evaluation of Ni/SiO2 catalysts for hydrogen production and tar reduction from catalytic steam pyrolysis-reforming of refuse derived fuel

“…For example Zapata and collaborators [46], added Ce to Ni/SiO 2 catalysts in order to promote methane reforming and the stability of the catalysts. Also Choudhary et al [28], added Mg to different supported Ni-catalysts to enhance the steam adsorption capability, to stabilize the Ni and to prevent catalyst sintering.…”

“…From Table, Ce added Ni/SiO 2 -B catalyst also showed a higher H 2 concentration and gas yield compared with the Al-Ni/SiO 2 -B catalyst. Ce and Mg have been reported to promote methane steam reforming [46], to enhance the catalytic activity [47], and water-gas shift reactions [5]; while probably only a minor promotion could be obtained using Al. [5,27,49,50].…”

The effect of CH 4 decomposition temperature on the property of deposited carbon over Ni/SiO 2 catalyst

“…3 displayed the Raman spectra of the used catalysts, and three major peaks at 1325 cm À1 (D band), 1575 cm À1 (G band) and 1604 cm À1 (D 0 band) were observed on all of the used Ni/SiO 2 catalyst. The D band is the disorderinduced band, arising from the breathing modes of sp 2 atoms in rings; and the G band is attributed to the in-plane CeC stretching vibrations of all pairs of sp 2 atoms in graphite layers; whereas the D 0 band, a shoulder peak in G band, is also associated to the presence of defects in graphite and other carbonaceous species [5,16,26]. The relatively strong intensity of the D band to G band suggests the presence of more disordered carbonaceous species than graphitic carbon on the used catalyst, since the intensity of the D band increases with increasing structural imperfections of graphite.…”

“…They found that the catalytic activity and stability of the Ni/SiO 2 catalyst depended on the Ni loading to some extent. Zapata et al [16] investigated the catalytic behavior of promoted Ni/SiO 2 catalysts in methane decomposition. They found that Ni-based catalysts were easily covered by graphitic carbon inhibiting the interaction with methane and consequently giving rise to a lower activity with a rapid and permanent deactivation, whereas ceria improved the distribution and migration of deposited carbon.…”