In situ surface dynamics in heterogeneous catalysis

Mechanistic Investigation of Heterogeneous Catalysis by Transient Infrared Methods

“…3 shows that gaseous CO rapidly exchange with adsorbed gem-dicarbonly. It has been suggested that the rapid exchange of the adsorbed CO and gaseous CO is resulted from an adsorption-assisted desorption process, which shows that the rate of desorption of adsorbed CO has a strong dependence on the partial pressure of gaseous CO [2,4]. This adsorption-assisted desorption phenomenon has been attributed to repulsive interaction among adsorbed species [15].…”

“…Determination of the reactivity of adsorbates is of critical importance in developing an understanding of heterogeneous catalytic reaction mechanisms [1][2][3][4][5][6]. Although developments of various spectroscopic techniques have contributed to the identification of reaction intermediates that are responsible for certain elementary steps [1][2][3][7][8][9], elucidation of the overall reaction mechanism remains a key challenge in heterogeneous catalysis research.…”

“…Although developments of various spectroscopic techniques have contributed to the identification of reaction intermediates that are responsible for certain elementary steps [1][2][3][7][8][9], elucidation of the overall reaction mechanism remains a key challenge in heterogeneous catalysis research. Major difficulties in the investigation of the mechanism of catalytic reactions arise from the transient nature of intermediates and the influence of reactants and products on the reactivity of adsorbates and catalyst surfaces [1][2][3][4]. Information about the overall reaction sequence in heterogeneous catalysis may not be obtained by examining each elementary step independently in the absence of reactant mixtures [2].…”

“…The reactivity of adsorbates and the structure of the catalyst surface should be examined during the course of reaction due to their strong dependence on the partial pressure of reactants and temperature [4]. Infrared (IR) spectroscopy has been one of the most important means of studying adsorbates on supported catalysts [2,[24][25][26][27].…”