Characterization of Ca-promoted Ni/α-Al2O3 catalyst for CH4 reforming with CO2

Hou, Zhaoyin; Yokota, Osamu; Tanaka, Takumi; Yashima, Tatsuaki

doi:10.1016/s0926-860x(03)00543-x

Cited by 259 publications

(81 citation statements)

References 17 publications

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“…In the same way, Fakeeha and co-workers revealed that addition of Sr leads to coke suppression by improving the interaction between Co and the support and the Lewis basicity of the samples 12 . Similar results for alkali promotion were observed for Ni-based catalysts, which included K, Li, La, Mg, Ba and Ca [13][14][15][16][17][18][19] . Moreover, this promotion can be performed by adding the alkali directly during the synthesis of co-precipitated samples.…”

Section: Introductionsupporting

confidence: 74%

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

2014

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M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO 2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-550°C , CH 4 /CO 2 molar ratio of 1 and GHSV of 6000 NmL CH 4 ·g -1 ·h -1 . The partial substitution of Co by a third element increased the area and changed the acid/base properties, reducibility and crystallinity of the oxides. These modifications resulted in higher activity for dry reforming of methane, mainly related to the decrease in the acidity of the promoted materials and, consequently, lower carbon formation. The Li-modified sample presented the lowest coke deposition due to the increase in stronger basic sites. The Mg-promoted catalyst exhibited the best activity performance. This depicts the enhancement in the reducibility and acid/base properties found in the MgCoAl sample.

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Section: Introductionsupporting

confidence: 74%

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

2014

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“…There existed two reduction peaks over Ni 1 Co 0 catalyst: the first located at about 340°C belonging to the reduction of well-dispersed NiO species, and the higher peak centered at about 700°C was attributed to the reduction of bulk NiO species with strong interaction with the c-Al 2 O 3 . However, the complete reduction of Ni species required reduction temperature of more than 850°C as reported in literature [21], which was assigned to the reduction of NiAl 2 O 4 . However, cobalt catalyst (Ni 0 Co 1 ) owned three reduction peaks: the hydrogen consumption at 360°C was attributed to reduction of Co 3 O 4 to CoO, with subsequent reduction of CoO to Co at 550°C.…”

Section: Physicochemical Propertiesmentioning

confidence: 57%

Hydrogenolysis of glycerol aqueous solution to glycols over Ni–Co bimetallic catalyst: effect of ceria promoting

Jiang

Kong

et al. 2015

Appl Petrochem Res

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A series of Ni-Co bimetallic catalysts supported on c-Al 2 O 3 with different Ni/Co mass ratio were prepared by incipient wetness impregnation method for glycerol hydrogenolysis. The catalyst with a Ni/Co mass ratio of 1:3 (denoted as Ni 1 Co 3 ) exhibited the highest conversion. The performance was compared with that of catalysts promoted by Ce. Moreover, the addition of Ce showed a remarkable promoting effect on the catalytic performance when the cerium content was 2.5 wt%. The physicochemical properties of the supported Ni-Co catalysts were characterized by N 2 physisorption, XRD, H 2 -TPR, NH 3 -TPD, XPS and TEM. H 2 -TPR profiles revealed that the coexistence of Ni and Co components on support changed the respective reduction behavior of Ni or Co alone, showing the synergistic effect between Ni and Co species. Compared with the TPR profiles of Ni 1 Co 3 , it was clearly observed that the reduction peak of nickel oxide and/or cobalt oxide shifted down to the lower temperature zone gradually with the addition of Ce. It was most probable that the addition of Ce favored the formation of the strong interaction between metal species and ceria. The TEM images showed that the addition of Ce component could improve the dispersion of Ni-Co species on support and inhibited the agglomeration of metal particles during the reaction process, which might be responsible for the enhanced stability.

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“…Moreover, the other broad peaks at higher binding energy are ascribed to the Ni 2p of nickel oxide [20]. For Zn0.75Mg0.25Ni-P/Al2O3, the interaction between the Ni2P particles and the support leads to decrease of the binding energy of Ni δ+ (853.1 eV) [10,21]. As reported, the hydrogenation ability of the Ni site reduces with the decrease of electron density [22,23].…”

Section: Catalystmentioning

confidence: 62%

“…In addition, the P/Ni molar ratio is the lowest in Zn0.75Mg0.25Ni-P/Al2O3, which indicates that more Ni sites on the catalyst surface are exposed under the same Ni loading. [10,21]. As reported, the hydrogenation ability of the Ni site reduces with the decrease of electron density [22,23] [15] also reported that the Ni in Ni 12 P 5 has a higher electronic density than Ni 2 P.…”

Section: Catalystmentioning

confidence: 69%

High Active Zn/Mg-Modified Ni–P/Al2O3 Catalysts Derived from ZnMgNiAl Layered Double Hydroxides for Hydrodesulfurization of Dibenzothiophene

et al. 2017

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A series of ZnMgNiAl layered double hydroxides (LDHs) containing 20 wt.% Ni and different Zn/Mg molar ratios were prepared by a coprecipitation method, and then were introduced with H 2 PO 4 − via a microwave-hydrothermal method. With the resulting mixtures as the precursors, Zn/Mg-modified ZnMgNi-P/Al 2 O 3 catalysts were prepared. The Zn/Mg molar ratio affected the formation of Ni 2 P and Ni 12 P 5 in nickel phosphides. The ZnMgNi-P/Al 2 O 3 catalyst with a Zn/Mg molar ratio of 3:1 exhibits the best dibenzothiophene hydrodesulfurization (HDS) activity. Compared with the Ni-P/Al 2 O 3 catalyst prepared from the impregnation method, the ZnMgNi-P/Al 2 O 3 catalyst shows a higher HDS activity (81.6% vs. 54.3%) and promotes the direct desulfurization of dibenzothiophene.

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Characterization of Ca-promoted Ni/α-Al2O3 catalyst for CH4 reforming with CO2

Cited by 259 publications

References 17 publications

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

Hydrogenolysis of glycerol aqueous solution to glycols over Ni–Co bimetallic catalyst: effect of ceria promoting

High Active Zn/Mg-Modified Ni–P/Al2O3 Catalysts Derived from ZnMgNiAl Layered Double Hydroxides for Hydrodesulfurization of Dibenzothiophene

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