Vibrationally Excited CO2 Formed in CO + NO Reaction on Pd(110) Surface in High Surface Temperature Range

Abstract

The infrared chemiluminescence spectra of CO 2 formed during steady-state CO+NO reaction over Pd(110) indicated that the temperature of the bending vibrational mode was much higher than that of the antisymmetric one at higher surface temperatures such as 800-850 K. Especially, in the high temperature range, more vibrationally excited CO 2 was formed from CO+NO reaction than CO+O 2 reaction. On the basis of the result, we propose the model structure of reaction intermediates for CO 2 formation in CO+NO reaction, which is different from that in CO+O 2 reaction.

Surface science studies of selective catalytic reduction of NO: Progress in the last ten years

“…Studies of NO-CO reaction have been carried out on Pt(1 0 0) [30][31][32][33][34][35][36][37], Pt(1 1 1) [38], Pt(1 1 2) [39], Pd(1 0 0) [40], Pd(1 1 0) [41][42][43][44], Pd(1 1 1) [42,43,45,[46][47][48][49][50][51][52][53], Rh(1 0 0) [54], Rh(1 1 0) [54], Rh(1 1 1) [54][55][56][57][58][59][60][61][62][63][64][65], Ir(1 1 1) [66], Ir(2 1 1) [67], Cu(0 0 1) [68], Ag(1 1 1) [69], Pd/Cu(1 1 1) [48], Fe/Rh(1 0 0) [55], Rh/CeO x (1 1 1) [70], Pd/MgO(1 0 0) [71,72], Pt-Rh/TiO 2 (1 1 0) [73]...…”

IR Chemiluminescence Probe of the Vibrational Energy Distribution of CO2 Formed during Steady-State CO Oxidation on Pt(111) and Pt(110) Surfaces

“…[9][10][11] Another method is investigation of internal (vibrational and rotational) energy and translational energy of desorbed molecules, which are the products of catalytic reaction, from the catalyst surface. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] The energy states of desorbed molecules can reflect the catalytic reaction dynamics, which can correspond to a transition state (i.e., structure of the activated complex). 12-29 Numerous investigations of CO oxidation on Pt and Pd surfaces have revealed the elemental steps of surface-catalyzed reactions.…”

“…Furthermore, CO oxidation is a prototype reaction for the study of dynamics; measurements of internal energy states of the produced CO 2 molecules have been performed using an infrared chemiluminescence (IR emission) method under steady-state catalytic reactions using a molecular-beam technique. [13][14][15][16][17][18][19][20][21][22][23][24][25] Analyses of vibrational states can yield information about the structure of the activated CO 2 complex (i.e., the dynamics of CO oxidation) from which the gas-phase molecules desorbed. Furthermore, the vibrational energy states of product CO 2 depend on its surface structure.…”

“…Furthermore, the vibrational energy states of product CO 2 depend on its surface structure. [17][18][19][20][21][22][23][24][25] Consequently, information about the active sites is obtainable from the IR emission spectra of CO 2 under a steady-state catalytic reaction.…”

“…21,23,25 Furthermore, more detailed analysis of IR emission spectra has been possible using the IR intensity. [21][22][23][24][25] It is the first presentation that the detailed analyses of vibrational energy states of the produced CO 2 molecules give information about the dynamics of CO 2 formation, which are changed by lifting the surface structure of Pt(110).…”