Oxygen species on NiO/Al2O3 and their reactivities

Zhang, Xinjie; Gong, Yunqing; Yu, Gang; Xie, Yongbing

doi:10.1016/s1381-1169(01)00452-6

Cited by 39 publications

(27 citation statements)

References 11 publications

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“…A similar trend has been also proposed in the case of the promoted-or supported-NiO catalysts [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], with NiO as the main crystalline phase, in which low variations in the selectivity to ethylene with the ethane conversion is observed (at least at ethane conversions lower than 30%). Moreover, a strong influence of the addition of various promoters on the nature of active sites has been observed where only few metal oxides have shown a positive promoter effect.…”

Section: Introductionsupporting

confidence: 73%

“…In the last ten years, metal-promoted nickel oxides have been intensively studied as catalysts for the oxidative dehydrogenation (ODH) of ethane [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] especially those related to Ni-Nb-O metal oxides [2-4, 6-10, 12]. In fact, nickel oxide presents a low selectivity to ethylene (from 10 to 30% at conversion lower than 30%), depending on catalyst preparation procedure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Both Catalyst Preparation and Catalytic Behaviour for the Oxidative Dehydrogenation of Ethane of Ni–Sn–O Catalysts

et al. 2016

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Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Optimizing Both Catalyst Preparation and Catalytic Behaviour for the Oxidative Dehydrogenation of Ethane of Ni–Sn–O Catalysts

et al. 2016

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“…On the other hand, Ni-Nb-O oxides have been reported as active catalysts in the ODH of ethane [8][9][10] due to the interaction of small amount of Nb in NiO [8]. In the ODH of ethane, high activity was also reported for NiO-alumina [10][11][12][13] and NiO-MgO catalysts [14]. Chang et al [15] excluded Ni-ZSM-5 from being a good ODH catalyst due to an extremely high activity to generate methane.…”

Section: Introductionmentioning

confidence: 99%

Activity of the Ni–Al Mixed Oxides Prepared from Hydrotalcite-Like Precursors in the Oxidative Dehydrogenation of Ethane and Propane

et al. 2011

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The activity of Ni-Al mixed oxides obtained by the thermal pre-treatment of Ni-Al hydrotalcite-like precursors was studied in the ODH of ethane and propane. The activity of the Ni-Al mixed oxide catalysts was studied with respect to (i) the role of Ni content and (ii) the role of temperature during Ni-Al HTs thermal pre-treatment. The structure analysis and the activity of Ni-Al mixed oxides were discussed in three groups; (A) the catalysts pre-treated at 500°C, (B) the catalysts pre-treated at 600°C and (C) the Ni2-Al catalyst with constant Ni content pre-treated at 500-900°C. Ni-Al mixed oxides were active and selective catalysts in the ODH of ethane even at 450°C. On the other hand, the catalysts posses low selectivity to propene. It is supposed that the interaction of NiO with alumina phase plays the critical role in the active and selective catalysts. The Ni-Al mixed oxides were characterized by XRD, H 2 -TPR and diffuse reflectance spectroscopy.

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“…The effect of cerium on the catalytic behaviour of Ni-based catalysts in ODH reactions is still a matter of discussion. Pure NiO is highly active in ODH of ethane, but very low selective toward ethylene [16]. In ODH of ethane, NiO supported on Al 2 O 3 [17,18] is more selective for ethylene than pure NiO.…”

Section: Introductionmentioning

confidence: 98%

The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction

2015

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The aim of work was to analyse and discuss the effect of cerium on the catalytic behaviour of different types of nickel species in the oxidative dehydrogenation of ethane. Ni-Al and Ni-Ce-Al catalysts were prepared from cerium nitrate and nickel nitrate or nickel acetate as a precursor. As-prepared materials were characterized by using of XRD, DR UV-Vis spectroscopy and H 2 -TPR. It was found that the addition of cerium affects both the reducibility of nickel species and the population of nickel species. Firstly, the addition of cerium led to the significant decrease of the reduction peak at 755-785°C to about 40°C due to the Ni-Ce interaction at both Ni-Ce-Al-NO 3 and Ni-Ce-Al-ac catalysts. Secondly, the addition of cerium affected the relative population of nickel species in tetrahedral and octahedral coordination, which population originated from used nickel precursor. The presence of cerium in Ni-Ce-Al-NO 3 catalysts led to the decrease in the relative population of Ni(T d ) species, while the crystal size of NiO in Ni-Ce-Al-ac catalysts decreased with increasing Ce/Ni ratio. The highest ethylene productivity was achieved on catalysts with Ce/Ni molar ratio 0.13. Catalysts exhibited an ethylene productivity up to 1.0 gC 2 =Ág cat -1 Áh -1 with a selectivity of 82 % (Ni-Ce-Al-NO 3 ) and 1.3 gC 2 =Ág cat -1 Áh -1 with a selectivity of 75 % (Ni-CeAl-ac).

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Oxygen species on NiO/Al2O3 and their reactivities

Cited by 39 publications

References 11 publications

Optimizing Both Catalyst Preparation and Catalytic Behaviour for the Oxidative Dehydrogenation of Ethane of Ni–Sn–O Catalysts

Optimizing Both Catalyst Preparation and Catalytic Behaviour for the Oxidative Dehydrogenation of Ethane of Ni–Sn–O Catalysts

Activity of the Ni–Al Mixed Oxides Prepared from Hydrotalcite-Like Precursors in the Oxidative Dehydrogenation of Ethane and Propane

The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction

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