Ni Catalysts Supported on Mesoporous Nanocrystalline Magnesium Silicate in Dry and Steam Reforming Reactions

Abstract

Mesoporous nanocrystalline MgSiO 3 with high surface area was synthesized by a hydrothermal method and employed as support in dry and steam reforming of methane. Ni/MgSiO 3 catalysts were prepared by an impregnation method and characterized by different techniques. N 2 adsorption analysis indicated that addition of nickel shifted the pore size distributions to smaller sizes. Temperatureprogrammed reduction analysis revealed that a higher nickel loading enhanced the reducibility of the catalyst. The catalytic performance was improved with increasing the nickel content. The Ni/MgSiO 3 catalyst exhibited high stability in dry reforming but methane conversion declined with time-on-stream in the steam reforming reaction. Temperature-programmed oxidation profiles of spent catalysts indicated that the high amount of carbon deposited on the catalyst surface in dry and steam reforming was assigned to whisker-type carbon.

CO2 Methanation on Nickel Catalysts Supported on Mesoporous High‐Surface‐Area MgSiO3

“…The crystalline size of NiO determined from the Scherer equation, pore volume, pore diameter, and the BET area of the samples were determined in our previously published paper and the results are reported in Tab. . The %5Ni/MgSiO 3 catalyst exhibited the prominent surface area (502 m 2 g −1 ) and pore volume (0.61 cm 3 g −1 ) among the synthesized samples with various percentages of nickel.…”

“…a and b, respectively. The isotherms are type IV with H2‐shaped hysteresis loops, typical of mesoporous materials and solids consisting of particles crossed by channels with cylindrical shape or made by aggregated or agglomerated spherical particles , . The distribution of pore sizes was shifted to a smaller size by increasing the nickel loading.…”

Reaction Kinetics of Steam Reforming of n‐Butanol over a Ni/Hydrotalcite Catalyst

“…demonstrates that the patterns are similar and no new phase is seen in the pattern for the spent catalyst. The peaks at 37.2°, 43.2°, and 62.8° are due to NiO . The absence of peaks at 45°, 60°, and 66° suggest that NiAl 2 O 4 phase was not formed, possibly due to CaO.…”

Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

“…Besides Al 2 O 3 , other supports were also explored. As an inert support, SiO 2 has a weak interaction with Ni, leading to relatively weak metal‐support interaction and are less stable and less active compared to mildly acidic (Al 2 O 3 ) and basic (La 2 O 3 , CeO 2 ) supports . However, the high dispersion of Ni nanoparticles in nanochannels of cerium‐modified silica aerogels or in mesoporous silica can improve the catalytic activity and thermal stability .…”