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By Jöns Jakob Berzelius, John Black

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Extra resources for An Attempt to establish a pure scientific system of mineralogy by the application electro-chemical theory

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A side reaction of CO and water diluted considerably the radioactivity of the CO2 fraction after reaction. Reaction (8) was found valid on iron catalysts. [61] 3. Study of Reaction Kinetics by Isotope Tracer So far, the mere appearance of radioactivity in the assumed intermediate was used to obtain information on the likely route of the catalytic process. Following the changes at various levels of conversion would give information on the reaction kinetics, too. Before discussing the quantitative method, a semi-quantitative study will be considered.

Formation of cycloalkenyl ions from isobutane and incorporation of deuterium in the tertiary position. ch01 ch01 Deuterium-Labelling in Mechanistic Studies 27 solvation of the intermediates or transition states on solid acids necessitates further investigation. References [1] Melander L, Saunders WH, Reaction rates of Isotopic molecules, WileyInterscience, New York, 1980. [2] O’Ferral RAM, J Chem Soc 13: 785–790, 1970. [3] Mattson O, Westaway KC, Adv Phys Org Chem 31: 143, 1998. [4] Olah GA, Prakash GKS, Sommer J, Superacids, John Wiley & Sons Inc.

In order to distinguish between these options, small amounts of iso-butene were added to the feed stream. Protonation of iso-butene is a very facile step which generated the adsorbed t-butyl cation. The results obtained in the presence of alkenes show no change in the isotope effect, indicating that the slow step in the catalytic cycle is the breaking of the tertiary C-H bond of the iso-alkane during the hydride transfer step. [40] Linear alkanes, known to be less reactive, also undergo H/D exchange with the solid acid by the same mechanistic scheme, at slower rates and above 150◦ C.

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