Surface study of rhodium nanoparticles supported on alumina

Maroto-Valiente, A.; Rodrı́guez-Ramos, I.; Guerrero-Ruı́z, A.

doi:10.1016/j.cattod.2004.06.005

Cited by 16 publications

(15 citation statements)

References 38 publications

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“…This also limits the effect of the adsorption energy as a function of coverage. The adsorption energy of hydrogen have been reported to be up to 80 kJ/mol at low coverages and level out to approximately 35-50 kJ/mol at a coverage of h = 0.4-0.6 [28]. For H chemisorbed at the conditions present in these experiments, no experiments are reported.…”

Section: Discussionmentioning

confidence: 83%

“…The initial adsorption energy is determined to 165-175 kJ/mol [28] on a Rh/Al 2 O 3 catalyst and 195 kJ/mol for another Rh/Al 2 O 3 catalyst [26]. Higher coverages are also interesting to review due to a significant Table 1, except DH CO = -110.3 kJ/mol amount of CO in the gas phase in the experiments.…”

Section: Discussionmentioning

confidence: 99%

“…6 the CO adsorption energy is shown as a function of CO coverage for rhodium [28]. For a Rh/Al 2 O 3 catalyst, a plateau between h = 0.05-0.6 shows a constant adsorption energy (115-120 kJ/mol) and at higher coverages (h = 0.6-0.9) this levels off to approximately 95 kJ/mol [28]. These numbers agree well with our observations at different plateaus and the relative difference in adsorption energy at low and high coverage of approximately 16 kJ/mol found in our modeling of the steam and CO 2 reforming experiments.…”

Section: Discussionmentioning

confidence: 99%

“…The CO adsorption energy shows to depend on the CO surface coverage [26,28]. The initial adsorption energy is determined to 165-175 kJ/mol [28] on a Rh/Al 2 O 3 catalyst and 195 kJ/mol for another Rh/Al 2 O 3 catalyst [26].…”

Section: Discussionmentioning

confidence: 99%

“…In Fig. 6 the CO adsorption energy is shown as a function of CO coverage for rhodium [28]. For a Rh/Al 2 O 3 catalyst, a plateau between h = 0.05-0.6 shows a constant adsorption energy (115-120 kJ/mol) and at higher coverages (h = 0.6-0.9) this levels off to approximately 95 kJ/mol [28].…”

Section: Discussionmentioning

confidence: 99%

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Methane Steam Reforming Kinetics for a Rhodium-Based Catalyst

Jakobsen

Chorkendorff

et al. 2010

Catal Lett

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Methane steam reforming is the key reaction to produce synthesis gas and hydrogen at the industrial scale.Here the kinetics of methane steam reforming over a rhodium-based catalyst is investigated in the temperature range 500-800°C and as a function of CH 4 , H 2 O and H 2 partial pressures. The methane steam reforming reaction cannot be modeled without taking CO and H coverages into account. This is especially important at low temperatures and higher partial pressures of CO and H 2 . For methane CO 2 reforming experiments, it is also necessary to consider the repulsive interaction of CO that lowers the adsorption energy at high CO coverage. The CO-CO interaction is supported by comparison with fundamental surface science studies.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%