Publication

In-situ surface and gas phase analysis for kinetic studies under transient conditions. The catalytic hydrogenation of CO2

Albert Renken
1997
Journal Articles

Abstract

Transient measurement techniques were applied to the kinetic investigation of the reaction mechanism of CO2 methanation, using diffuse-reflectance IR spectroscopy and mass spectrometry. The coupled information of the surface intermediates and the time evolution of the gas-phase components leads to accurate identification of spectator species on the surface. Reaction intermediates (e.g., CO and formates) were identified. The former is a key intermediate, and its hydrogenation leads to methane formation. The latter is fixed on the support, in equil. with a active formate species on the interface metal-support. A reaction mechanism was proposed, including the formation of formates through a carbonate species. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/a6b9f795-d88a-4ed3-ab0c-00acdba42b5b

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Albert Renken
1997
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a6b9f795-d88a-4ed3-ab0c-00acdba42b5b

About this result

Related concepts (32)

Reaction mechanism

In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases. The conjectured mechanism is chosen because it is thermodynamically feasible and has experimental support in isolated intermediates (see next section) or other quantitative and qualitative characteristics of the reaction.

Asymmetric hydrogenation

Asymmetric hydrogenation is a chemical reaction that adds two atoms of hydrogen to a target (substrate) molecule with three-dimensional spatial selectivity. Critically, this selectivity does not come from the target molecule itself, but from other reagents or catalysts present in the reaction. This allows spatial information (what chemists refer to as chirality) to transfer from one molecule to the target, forming the product as a single enantiomer.

Reaction progress kinetic analysis

In chemistry, reaction progress kinetic analysis (RPKA) is a subset of a broad range of kinetic techniques utilized to determine the rate laws of chemical reactions and to aid in elucidation of reaction mechanisms. While the concepts guiding reaction progress kinetic analysis are not new, the process was formalized by Professor Donna Blackmond (currently at Scripps Research Institute) in the late 1990s and has since seen increasingly widespread use.

Related publications (6)

In-situ surface and gas phase analysis for kinetic studies under transient conditions. The catalytic hydrogenation of CO2

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