Comparison of reduction behavior of Fe2O3, ZnO and ZnFe2O4 by TPR technique

Liang, Meisheng; Kang, Wenkai; Xie, Kui

doi:10.1016/s1003-9953(08)60073-0

Cited by 155 publications

(69 citation statements)

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“…1). The broad reduction peak located at about 665°C is related to the reduction of ZnO to metallic zinc [50], while the roughness of reduction plots observed above 800°C is probably a result partial sublimation of metallic zinc [51]. The reduction profiles of the samples containing both copper and iron are much more complex (Fig.…”

Section: Resultsmentioning

confidence: 98%

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Jabłońska

Chmielarz

Węgrzyn

et al. 2013

J Therm Anal Calorim

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and Fe 3? in the Me III positions were synthesized by coprecipitation method. Detailed studies of thermal transformation of obtained LDHs into metal oxide systems were performed using high temperature X-ray diffraction in oxidising and reducing atmosphere, thermogravimetry coupled with mass spectrometry and temperature-programmed reduction. The LDH samples calcined at 600 and 900°C were tested in the role of catalysts for selective oxidation of ammonia into nitrogen and water vapour. It was shown that all copper congaing samples presented high catalytic activity and additionally, for the Cu-Mg-Al and Cu-Mg-Fe hydrotalcite samples calcined at 600°C relatively high stability and selectivity to dinitrogen was obtained. An increase in calcination temperature to 900°C resulted in a decrease of their catalytic activity, possibly due to formation of well-crystallised metal oxide phases which are less catalytically active in the process of selective oxidation of ammonia.

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Section: Resultsmentioning

confidence: 98%

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Jabłońska

Chmielarz

Węgrzyn

et al. 2013

J Therm Anal Calorim

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“…It can be pointed out that addition of Fe slightly shifts the reduction of Ni oxide interacting with Al 2 O 3 to lower temperatures. In this case, also the presence of Fe oxide (and the formation of more oxygen vacancies) improves the reduction of NiO [38].…”

Section: Reducibility: H 2 -Tprmentioning

confidence: 99%

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Yang

Pastor‐Pérez

et al. 2018

Applied Catalysis B: Environmental

157

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In the context of Carbon Capture and Utilisation (CCU), the catalytic reduction of CO 2 to CO via reverse watergas shift (RWGS) reaction is a desirable route for CO 2 valorisation. Herein, we have developed highly effective Ni-based catalysts for this reaction. Our study reveals that CeO 2 -Al 2 O 3 is an excellent support for this process helping to achieve high degrees of CO 2 conversions. Interestingly, FeO x and CrO x , which are well-known active components for the forward shift reaction, have opposite effects when used as promoters in the RWGS reaction. The use of iron remarkably boosts the activity, selectivity and stability of the Ni-based catalysts, while adding chromium results detrimental to the overall catalytic performance. In fact, the iron-doped material was tested under extreme conditions (in terms of space velocity) displaying fairly good activity/stability results. This indicates that this sort of catalysts could be potentially used to design compact RWGS reactors for flexible CO 2 utilisation units.

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“…Sample 2 shows at temperature 555 o C the reduction process for Fe 3 O 4 to FeO has been occurred. There has been mentioned that amount of zinc will decrease the hydrogen consumption for reduction process [8]. This can be seen from Figure 5 that zinc contain for sample 1 is higher than sample 2.…”

Section: Oxide Reductionmentioning

confidence: 63%

Properties of Mn_0.4Zn_0.6Fe₂O₄and Mn_0.6Zn_0.4Fe₂O₄as Nanocatalyst for Ammonia Production

et al. 2017

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Abstract. Ammonia synthesis requires high pressure and high temperature process. Unfortunately, the capital intensive cost resulting low yield of ammonia by using recent catalyst which is iron oxide. Therefore, manganese zinc ferrite as a soft ferrite material will be introduced as a new nanocatalyst to enhance the ammonia yield. As a new nanocatalyst for ammonia production, study of comparasion two different concentration of MnZn Ferrite is very important. This paper will compare the yield of ammonia by using two different nanocatalyst which are Mn 0.4 Zn 0.6 Fe 2 O 4 and Mn 0.6 Zn 0.4 Fe 2 O 4 . Both were synthesized by sol-gel method and has been characterize by using FESEM (morphology), XRD (phase identification), EDX (elemental analysis) and TPR (oxide reduction). The ammonia was produce with and without magnetic field applied. The result shows that the ammonia yield is higher for Mn 0.4 Zn 0.6 Fe 2 O 4 nanocatalyst than Mn 0.6 Zn 0.4 Fe 2 O 4 by using magnetic field applied. 67.2% of yield has been achieved by using new nanocatalyst Mn 0.6 Zn 0.4 Fe 2 O 4 and magnetic field applied at ambient environment.

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Comparison of reduction behavior of Fe2O3, ZnO and ZnFe2O4 by TPR technique

Cited by 155 publications

References 1 publication

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Properties of Mn_0.4Zn_0.6Fe₂O₄and Mn_0.6Zn_0.4Fe₂O₄as Nanocatalyst for Ammonia Production

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Comparison of reduction behavior of Fe2O3, ZnO and ZnFe2O4 by TPR technique

Cited by 155 publications

References 1 publication

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Properties of Mn0.4Zn0.6Fe2O4and Mn0.6Zn0.4Fe2O4as Nanocatalyst for Ammonia Production

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Properties of Mn_0.4Zn_0.6Fe₂O₄and Mn_0.6Zn_0.4Fe₂O₄as Nanocatalyst for Ammonia Production