Drift and mass spectroscopic studies on the reactivity of rhodium clusters at the surface of polycrystalline oxides

TAP Investigations of the CO2Reforming of CH4over Pt/ZrO2

“…The CO 2 also dissociates on the catalyst, producing an oxygen species and CO. Though the CO 2 dissociation on supported noble metals has been previously observed (15,16), the literature is not clear on how it dissociates. Tol et al (19) reported that CO 2 does not dissociate on Pt, even though dissociation did occur on Rh (20).…”

“…If no interaction takes place between the gases and the sample in the reactor, the molecules will exit the reactor at different times, with the lightest first and the heaviest last. For the pump-probe experiments and the experiments with the 13 CH 4 , the pulse intensities were 10 16 or smaller, and so gas phase diffusion was mainly Knudsen diffusion in those experiments. This indicates that the order in which the various molecules exited the reactor was H 2 followed by CH 4 , H 2 O, CO, Ar, and finally CO 2 .…”

“…On the other hand, adsorbed hydrogen does react with CO 2 as was demonstrated in the experiments with combined H 2 and CO 2 pulses. Solymosi et al (15) have suggested that an enhanced dissociation of CO 2 occurs in the presence of H 2 , and Basini et al (16) reported that CO 2 chemisorption on Rh clusters was enhanced by hydrogen due to the formation of a hydridocarbonyl cluster. It could thus be argued that pulsing the CO 2 soon after the CH 4 will result in an enhanced CO 2 reaction due to the presence of more hydrogen on the surface.…”

A study of methane partial oxidation in annular reactor: activity of Rh/α-Al2O3 and Rh/ZrO2 catalysts

“…A 0.5% Rh/a-Al 2 O 3 and 0.5% Rh/ZrO 2 by weight were prepared by a grafting technique [25]. Before impregnation, the supports were calcined to reach the high temperature stable phases, which were verified by X-ray diffraction.…”

Axial variation of the oxidation state of Pt-Rh/Al2O3 during partial methane oxidation in a fixed-bed reactor: An in situ X-ray absorption spectroscopy study

“…One important catalytic reaction is the partial oxidation of natural gas to hydrogen and carbon monoxide (synthesis gas), which can be regarded as the first step to convert natural gas into liquid products such as methanol, DME, or synthetic fuels [12][13][14][15][16][17][18][19][20][21]. Typically, supported noble metals are used for this reaction.…”