Fe Promoted Rh-Clusters in Zeolite NaY: Characterization and Catalytic Performance in CO Hydrogenation

Schünemann, Volker; Treviño, Horacio; Lei, G.D.; Tomczak, D.C.; Sachtler, Wolfgang M.H.; Fogash, K.B.; Dumesic, J.A.

doi:10.1006/jcat.1995.1116

Cited by 55 publications

(21 citation statements)

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“…The manganese oxide reduction peaks seem to overlap with that of the rhodium oxide. The ability of a noble metal oxide to accelerate the reduction of a second surface metal oxide species with which it is in intimate contact has been reported previously [32,33]. Metallic rhodium provides sites for hydrogen adsorption and dissociation with an extremely low activation energy.…”

Section: Catalyst Characterizationmentioning

confidence: 87%

Manganese-promoted Rh/Al2O3 for C2-oxygenates synthesis from syngas

Ojeda¹,

Granados²,

Rojas³

et al. 2004

Applied Catalysis A: General

135

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Section: Catalyst Characterizationmentioning

confidence: 87%

Manganese-promoted Rh/Al2O3 for C2-oxygenates synthesis from syngas

Ojeda¹,

Granados²,

Rojas³

et al. 2004

Applied Catalysis A: General

135

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“…It was also reported that the existence of manganese species could suppress the reduction of the rhodium precursor, thereby increasing the difficulty of rhodium reduction [22,23]. Since the rhodium dispersion increased in our work, the rhodium and the promoters such as manganese were expected to contact more extensively.…”

Section: Surface Properties Of Silica Supportmentioning

confidence: 88%

CO Hydrogenation to C2-oxygenates over Rh–Mn–Li/SiO2 Catalyst: Effects of Support Pretreatment with nC1–C5 Alcohols

et al. 2007

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The effects of support pretreatment with nC 1 -C 5 alcohols on the performance of Rh-Mn-Li/SiO 2 catalyst in the synthesis of C 2 -oxygenates from syngas have been investigated by CO hydrogenation reaction, transmission electron microscopy (TEM), pulse adsorption of CO and H 2 , and Fourier Transform infrared (FT-IR) spectroscopy. The catalysts prepared from the pretreated silica supports exhibited higher space time yields of C 2 -oxygenates (STY C2-oxy ) and selectivities towards C 2 -oxygenates (S C2-oxy ) than that prepared from the untreated silica support. The enhancement in the hydrophobicity of the pretreated silica supports would be favorable for increasing Rh dispersion and ratio of Rh + /Rh 0 sites, therefore increasing the number of active sites, especially the active sites for CO insertion. Such variations are responsible for the improvements in the catalytic performance of the Rh-Mn-Li/SiO 2 catalyst.

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“…When the Fe loading exceeded 0.25 wt%, the peak at 100°C was split into two overlapping peaks. The shoulder peak may represent the reduction of Fe 2 O 3 [42]. This indicated that Fe started to reduce after Rh 3?…”

Section: H 2 -Tpr Studymentioning

confidence: 92%

The Promoting Effect of Fe Doping on Rh/CeO2 for the Ethanol Synthesis

et al. 2015

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The effects of Fe promotion were investigated on the activity and selectivity of Rh/CeO 2 catalyst for the direct synthesis of ethanol from syngas. The catalysts were comprehensively characterized by X-ray diffraction (XRD), N 2 adsorption-desorption, CO uptake, H 2 -TPR, temperature programmed surface reaction (TPSR), and FT-IR. XRD, CO uptake and FT-IR measurements indicated that Rh particles were well dispersed. TPSR results revealed that the addition of Fe changed CO dissociation behavior over the catalysts. FT-IR results showed that Fe promoter stabilized both linear carbonyl and gem-dicarbonyl species, which could be responsible for the improved catalytic activity. The interaction between Rh and Fe species is proposed to play a crucial role in achieving higher ethanol selectivity. Graphical Abstract

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Fe Promoted Rh-Clusters in Zeolite NaY: Characterization and Catalytic Performance in CO Hydrogenation

Cited by 55 publications

References 0 publications

Manganese-promoted Rh/Al2O3 for C2-oxygenates synthesis from syngas

Manganese-promoted Rh/Al2O3 for C2-oxygenates synthesis from syngas

CO Hydrogenation to C2-oxygenates over Rh–Mn–Li/SiO2 Catalyst: Effects of Support Pretreatment with nC1–C5 Alcohols

The Promoting Effect of Fe Doping on Rh/CeO2 for the Ethanol Synthesis

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