Catalytic oxidation of methane on zeolites containing rhodium, iridium, palladium and platinum

Firth, J. G.; Holland, H. B.

doi:10.1039/tf9696501891

Cited by 20 publications

(3 citation statements)

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“…Rh is far less studied for CH 4 oxidation, , but it is an important component of the three-way catalyst, where it yields improved catalytic activity and stability. , Here, we report that a rhodium-based 2 wt % Rh/ZSM-5 catalyst can achieve high methane conversion at practically achievable temperatures and high space velocities even in the combined presence of H 2 O and SO 2 . Although the high cost of Rh should be considered, when evaluating the business case for Rh catalysts, the identification of a catalyst that provides high conversion at realistically achievable conditions is a fundamental advance that shows great promise for the development of solutions to the methane slip problem.…”

Section: Introductionmentioning

confidence: 81%

“…Whereas Pdbased catalysts are relatively sulfur-tolerant under dry conditions, 28,29 the simultaneous presence of H 2 O and SO 2 causes a severe inhibition of the catalytic activity. 18,30 Rh is far less studied for CH 4 oxidation, 31,32 but it is an important component of the three-way catalyst, where it yields improved catalytic activity and stability. 33,34 Here, we report that a rhodium-based 2 wt % Rh/ZSM-5 catalyst can achieve high methane conversion at practically achievable temperatures and high space velocities even in the combined presence of H 2 O and SO 2 .…”

Section: ■ Introductionmentioning

confidence: 99%

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A Rhodium-Based Methane Oxidation Catalyst with High Tolerance to H₂O and SO₂

et al. 2020

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Increased use of natural gas as a fuel in efficient, lean-burning engines could offer environmental advantages, but this necessitates a catalytic oxidation of methane escaping from the engine. The challenge for the catalytic oxidation of CH4 is that the catalyst must operate in the exhaust, which contains H2O (5–15 vol %) and SO2 (∼1 ppm), and both components cause a severe inhibition of the catalyst. Here, we report that a 2 wt % Rh/ZSM-5 catalyst offers great promise by showing that high methane conversion can be reached at practically achievable conditions and high space velocities also in the presence of H2O and SO2. Rh-based catalysts, which are in the form of Rh2O3 under reaction conditions, become superior to the state-of-the-art Pd-based catalysts in an atmosphere with both H2O and SO2. Although both H2O and SO2 inhibit Pd and Rh catalysts, water is found to have a destabilizing effect on rhodium sulfate that enables a partial decomposition of the sulfate below 400 °C. We propose that this partly alleviates the sulfur poisoning of Rh catalysts; wherefore, the combined inhibition from H2O + SO2 is weaker for Rh than that for Pd.

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Section: Introductionmentioning

confidence: 81%

Section: ■ Introductionmentioning

confidence: 99%

A Rhodium-Based Methane Oxidation Catalyst with High Tolerance to H₂O and SO₂

et al. 2020

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“…Several studies of the catalytic decomposition of nitrous oxide have been reported recently (77,27,29,85). In a study on a series of oxides with the general formula M2Os (35), mostly rare-earth oxides, the kinetics were described by a rate law of the form It w-as concluded that desorption of oxygen is the rate-limiting step' in the sequence N20 ;=± N20 (ads) N20 (ads) + e--* N20" (ads) N20" (ads) -0~( ads) + N2 The apparent activation energies and preexponential factors for the various oxides show a strong correlation with the corresponding kinetic parameters for the isotopic exchange reaction of ls02 with the oxide surfaces.…”

Section: Reactions Of Nitrogen Oxidesmentioning

confidence: 99%