Readsorption and adsorption-assisted desorption of CO2 on basic solids

Article Abstract:

The adsorption-assisted desorption of 13CO2 from the surface of basic oxides based on modified MgO has been investigated. In the study, the carbon dioxide desorption rates from 1.0 wt % K-MgO and 3.5 wt % K-Cu0.5Mg5CeOx porous solids at conditions was measured using a 13CO2/12CO2 isotopic switch method. The results showed that the 13CO2 desorption rates increased as the concentration of 12CO2 increased in the gas phase, and with increasing carrier gas flow rate. The increase was attributed to the decrease in the probability of 13CO2 readsorption.

Carbon dioxide, Thermal properties, Adsorption, Thermal desorption

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Structure and density of Mo and acid sites in Mo-exchanged H-ZSM5 catalysts for nonoxidative methane conversion

Article Abstract:

Physical mixtures of MoO3 and H-ZSM5 were used to prepare Mo/H-ZSM5 catalysts for CH4 aromatization. The MoOx species migrated onto the external ZSM5 surface at about 623 K as indicated by x-ray diffraction and elemental analysis of physical mixtures treated in air. Each Mo atom replaced one H+ during exchange as shown by the amount of H2O evolved during exchange and the amount of residual OH groups detected by isotopic equilibration with D2.

Catalysts, Methane, Aromatic compounds

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Mechanism and site requirements for activation and chemical conversion of methane on supported Pt clusters and turnover rate comparisons among noble metals

Article Abstract:

Isotropic tracer and kinetic studies are used to probe the identity and reversibility of elementary steps required for H2O and CO2 reforming of CH4 on supported Pt clusters and to demonstrate a rigorous kinetic and mechanistic equivalence for CO2 and H2O reforming.

Analysis, Water chemistry, Cluster analysis, Chemical properties

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