α-Alumina-Supported Nickel Catalysts Prepared from Nickel Acetylacetonate: A TPR Study

Molina, Rafael; Poncelet, Georges

doi:10.1006/jcat.1997.1931

Cited by 155 publications

(72 citation statements)

References 52 publications

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“…The Ni-La-1 and Ni/h-Al 2 O 3 catalysts showed similar TPR patterns, i.e., a broad peak at peak maximum of about 923 K and a small shoulder peak at peak maximum of about 1,073 K. Furthermore, the lower reduction peak of the Ni/h-Al 2 O 3 catalyst was sharper than that of the Ni-La-1 catalyst, which can be explained as the effect of La 2 O 3 in the catalysts. The broad peak could be attributed to the reduction of complex NiO species having strong interactions with the support while the small shoulder peak was assigned to the reduction of the highly dispersed NiAl 2 O 4 species as discussed in other investigations [31,[38][39][40][41].…”

Section: Characterization Of Ni/mo X /Al 2 Omentioning

confidence: 95%

“…Moreover, the broad peak, appearing in the catalysts of Ni-La-1 and Ni/h-Al 2 O 3 , changed to a small shoulder peak in Ni-La-2 and Ni-La-3 catalysts. It is reported [38] that the hydrogen consumption peaks, appearing at different temperature regions, are assigned to the reduction of different species. Generally, low temperature peak can be attributed to the reduction of larger NiO particles, which are relatively free and can be detected by XRD analysis, while the higher temperature peak is assigned to the reduction of complex NiO species having intimate contact with the support [39].…”

Section: Characterization Of Ni/mo X /Al 2 Omentioning

confidence: 99%

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Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

Roh

Jun

2008

Catal Surv Asia

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The preparation of synthesis gas from carbon dioxide reforming of methane (CDR) has attracted increasing attention. The present review mainly focuses on CDR to produce synthesis gas over Ni/MO x /Al 2 O 3 (X = La, Mg, Ca) catalysts. From the examination of various supported nickel catalysts, the promotional effects of La 2 O 3 , MgO, and CaO have been found. The addition of promoters to Al 2 O 3 -supported nickel catalysts enhances the catalytic activity as well as stability. The catalytic performance is strongly dependent on the loading amount of promoters. For example, the highest CH 4 and CO 2 conversion were obtained when the ratios of metal M to Al were in the range of 0.04-0.06. In the case of Ni/La 2 O 3 / Al 2 O 3 catalyst, the highest CH 4 conversion (96%) and CO 2 conversion (97%) was achieved with the catalyst (La/ Al = 0.05 (atom/atom)). For Ni/CaO/Al 2 O 3 catalyst, the catalyst with Ca/Al = 0.04 (atom/atom) exhibited the highest CH 4 conversion (91%) and CO 2 conversion (92%) among the catalysts with various CaO content. Also, Ni/ MgO/Al 2 O 3 catalyst with Mg/Al = 0.06 (atom/atom) showed the highest CH 4 conversion (89%) and CO 2 conversion (90%) among the catalysts with various Mg/Al ratios. Thus it is most likely that the optimal ratios of M to Al for the highest activities of the catalysts are related to the highly dispersed metal species. In addition, the improved catalytic performance of Al 2 O 3 -supported nickel catalysts promoted with metal oxides is due to the strong interaction between Ni and metal oxide, the stabilization of metal oxide on Al 2 O 3 and the basic property of metal oxide to prevent carbon formation.

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Section: Characterization Of Ni/mo X /Al 2 Omentioning

confidence: 95%

Section: Characterization Of Ni/mo X /Al 2 Omentioning

confidence: 99%

Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

Roh

Jun

2008

Catal Surv Asia

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“…Ni/Mg/ AlO showed two reduction peaks with T M at 620 and 1017 K, respectively. The former peak at 620 K corresponded to the reduction of the nickel not included in the co-precipitation which was deposited over mixed oxides or the nickel which had low interaction with the support [39], and the latter at 1017 K was ascribed to the reduction of nickel in the NiOMgO solid solution. Ni/Mg/AlO-F only displayed one reduction peak with T M at around 980 K, indicating all NiO species were highly distributed in the bulk phase of the periclase-type NiO-MgO solid solution [30].…”

Section: Basicitymentioning

confidence: 97%

Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

2010

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Fluorine-modified Ni-Mg-Al mixed oxides prepared by thermal decomposition of hydrtalcite-type (HT) precursor was characterized by XRD, EXAFS, TGA, SEM, TPD-CO 2 , TPR-H 2 , N 2 adsorption/desorption technique, and then tested in the partial oxidation of methane (POM). The result revealed that fluorine was successfully introduced into Ni-Mg-Al mixed oxide via the high dispersion of MgF 2 , which led to the formation of the periclase-type catalyst with mesoporous structure. By compared with pure Ni-Mg-Al mixed oxides, they had the low surface area and crystallization with small particle size, but the high moderate and strong basicity. Such catalyst showed a high performance over POM without deactivation even after 120 h run at 1053 K. This could be attributed to the promotion effect of the F -anions, which improved the homogeneous distribution of nickel and basicity of the catalyst with high resistance to coking and sintering.

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“…As Ni II is reduced to Ni 0 without going through intermediate oxides, the hydrogen consumption peaks appearing in different temperature regions have been assigned to the reduction of different species. [45] Generally, low-temperature peaks are attributed to the reduction of large NiO particles, while the peaks at higher temperature are attributed to the reduction of NiO in intimate contact with the oxide support.…”

Section: Redox Propertiesmentioning

confidence: 98%

Preparation of Ni‐Based Metal Monolithic Catalysts and a Study of Their Performance in Methane Reforming with CO₂

Wang¹,

Li²,

Ji³

et al. 2008

ChemSusChem

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A series of Ni/SBA-15/Al(2)O(3)/FeCrAl metal monolithic catalysts with Ni loadings varying between 3 % and 16 % were prepared, and their structure was characterized by various techniques. The catalytic activity of the catalyst for methane reforming with CO(2) leading to synthesis gas was evaluated using a fixed-bed reactor. The results indicate good catalytic activity of the Ni/SBA-15/Al(2)O(3)/FeCrAl samples under the reaction conditions. The catalyst with a Ni loading of 8.0 % displays excellent activity and stability at 800 degrees C over 1400 h time on stream. After reaction, the hexagonal mesoporous structure of SBA-15 is still present and the pore walls of SBA-15 prevent the aggregation of nickel. Interactions between NiO, SBA-15, and the Al(2)O(3)/FeCrAl support modify the redox properties of the Ni/SBA-15/Al(2)O(3)/FeCrAl catalysts.

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α-Alumina-Supported Nickel Catalysts Prepared from Nickel Acetylacetonate: A TPR Study

Cited by 155 publications

References 52 publications

Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

Preparation of Ni‐Based Metal Monolithic Catalysts and a Study of Their Performance in Methane Reforming with CO₂

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α-Alumina-Supported Nickel Catalysts Prepared from Nickel Acetylacetonate: A TPR Study

Cited by 155 publications

References 52 publications

Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

Carbon Dioxide Reforming of Methane over Ni Catalysts Supported on Al2O3 Modified with La2O3, MgO, and CaO

Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

Preparation of Ni‐Based Metal Monolithic Catalysts and a Study of Their Performance in Methane Reforming with CO2

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Product

Resources

About

Preparation of Ni‐Based Metal Monolithic Catalysts and a Study of Their Performance in Methane Reforming with CO₂