Surface addity

Parry, E.P. (1953) An infrared study of pyridine adsorbed on addic solids. Characterization of surface addity. 

Lercher, J.A., Grundling, C., and Eder-Mirth, G. (1996) Infrared studies of the surface addity of oxides and zeolites using adsorbed probe molecules. Catal. Today, 27, 353-376. 

It has been established in literature that the formation of the propylene occurs on the add centers (1-7). On the contrary, the formation of acetone and MAA occurs via a redox mechanism, even if it was proposed that possibly different kinds of molybdenum sites can be involved in the two reactions (4,7). A common reaction intermediate has been proposed for MAA and acetone, but disagreement exists about the nature of this intermediate, either cationic (underlying the importance of surface addity) (9,12) or radicalic (1). 

Morterra, C., Cerrato, G., Emanuel, C., Bolis, V. (1993). On the Surface Addity of Some Sulfate-Doped ZrCh Catalysts. Journal of Catalysis, Vol.142, No.2, (August 1993), pp. 349-367, ISSN 0021-9517... 

E. Selli, L. Fomi, Comparison between the surface addity of solid catalysts determined by TPD and FTIR analysis of pre-adsorbed pyridine. Microporous Mesoporous Mater. 31, 129-140 (1999). doi 10.1016/S1387-1811(99)00063-3... 

Both the Engelhardt test and the Neue test capture the total silanol activity at neutral pH. They do not discriminate between addic and regular silanols. Therefore Walter (18) designed a test capable of measuring the amount of addk silanols alone. The test uses a phosphate buffer at pH 3.0 in a methanol/buffer mobile phase. The basic analytes that probe the addic silanols are propranolol and chlorpheniramine, and the neutral reference compound is toluamide. Results of this test were correlated with the metal contamination in the matrix of the parent silica, which is believed to control the addity of the surface silanols. 

Samples Surface area (m g- ) Pore volume (cm g ) Addity° (mmolCHA g )... 

Properties directly affected by the surface chemistry include the wetting behavior, adsorption/ attraction, surface charges, basicity/addity, and chemical reactivity. Examples include the increased biocompatibility of CNTs with increasing water solubility, a property which can be achieved by PEGylating (PEG polyethylenglycol) CNTs [122] the covalent incorporation of nanomaterials into a polymer matrix, which results in good dispersions and direct uptake of loads by the reinforcement material [123] and the transformation of nanoporous carbons to solid acids upon sulfonation (e.g., with 4-benzenediazoniumsulfonate) and its use in catalysis [124],... 

---