ChemInform Abstract: Magnesia‐Supported Nickel Catalysts. Part 1. Factors Affecting the Structure and Morphological Properties.

Arena, Francesco; Horrell, Ben; Cocke, D. L.; Parmaliana, A.; Giordano, N.

doi:10.1002/chin.199203022

Cited by 7 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among those, MgO shows the potential because the strong interaction between Ni species and MgO favors the formation of highly dispersed small Ni particles, which contributes to the great enhancement of CO 2 methanation activities [13,16,19,20]. Further modifications of the surface properties can be achieved by controlling the formation of 'ideal' Ni-Mg solid solution [21,22]. Ni-MgO nanoparticles encapsulated by porous silica shell, reveals a remarkable improvement in CO 2 conversion with high stability compared to the encapsulated NiO without MgO [23].…”

Section: Introductionmentioning

confidence: 99%

A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Yan

Dai

et al. 2016

Applied Catalysis B: Environmental

185

View full text Add to dashboard Cite

a b s t r a c tNovel Ni-W-Mg mixed oxide catalysts (NiWMgO x ) were prepared by homogeneous precipitation and attempted for the methanation of CO 2 . Adding W remarkably promoted the activity with improved stability, anti-CO-poisoning ability and resistance against coke formation compared to the undoped NiMgO x catalyst. The superior reactivity of monodentate formate towards hydrogenation than that of bidentate formate species was identified by DRIFTS analysis and the formation of more active monodentate formate species was indisputably facilitated by W additives, leading to the greatly enhanced catalytic activity. H 2 -TPR and CO 2 -TPD characterization showed that doping W increased the number of stable CO 2 adsorption sites and helped in anchoring the Ni sites as a result of strengthened Ni-Mg interaction, both of which were responsible for the enhanced CO 2 methanation activity and the improved resistance against sintering.

show abstract

Section: Introductionmentioning

confidence: 99%

A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Yan

Dai

et al. 2016

Applied Catalysis B: Environmental

185

View full text Add to dashboard Cite

show abstract

“…The segregation of nickel metal from the (Mg,Ni)O solid solution after reduction corresponded well with previously reported results. 12) Estimation of equilibrium oxygen partial pressure of Ni/NiO in (Mg,Ni)O solid solution at 1000°C was carried out using the ideal solution model and shown in Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

Expansion and shrinkage in the redox process of (Mg,Ni)O solid solutions for preparation of steam reforming catalysts in SOFCs

Nakamura

Somekawa

Baba

et al. 2009

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

(Mg,Ni)O solid solutions were synthesized by calcination of MgO and NiO mixtures (MgO:NiO = 65:35 in mol) at 1500°C for 2 h in air. When the samples were firstly reduced at 1000°C in a gas mixture of 4 vol% hydrogen and nitrogen, a volume expansion was observed. The results of powder X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDX) analyses suggested that the expansion after reduction was possibly caused by the creation of space between (Mg,Ni)O grains by segregation of nickel particles on (Mg,Ni)O grains. When the reduced samples were reoxidized at 1000°C in air and then reduced again at 1000°C in a gas mixture of 4 vol% hydrogen and nitrogen, the samples revealed an accelerated expansion, which was much larger than that of the samples reduced once. The morphological characteristics of (Mg,Ni)O grains and segregated nickel particles of the samples those were reduced twice differed to those of the samples reduced once: however, the phases of the all samples were similar, as verified by XRD and SEM analyses. The accelerated expansion after re-oxidation and reduction might be related to changes in the microstructure of the (Mg,Ni)O grains with the nickel particles segregated.

show abstract

“…Since filamentous coke brings Ni particles on the top, the regeneration of the spent catalyst implies a progressive loss of the active metal which impedes the suitability of Ni systems for any real ''CO x -free'' H 2 production process [11]. The addition of MgO to the Ni based catalytic systems and the consequent formation of Ni x Mg (1-x) O solid solution could confer specific features to the Ni active sites [8,12,13]. Indeed, the stabilization of small sized Ni crystallites and the higher MSI could favour a base growing mechanism of coke deposits [10] which avoids any Ni loss during the regeneration step.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Features of Mg Modified Ni/SiO2/Silica Cloth Systems in the Decomposition of Methane for Making “CO x -Free” H2

et al. 2008

Self Cite

View full text Add to dashboard Cite

The influence of the Mg addition on the catalytic performance of a 20% Ni based SiO 2 /silica cloth system in the decomposition of methane for making ''CO xfree'' H 2 in the T R range 773-873 K has been evaluated. As the Mg at /Ni at ratio increases from 0.10 to 2.20 the incipient Ni-Mg-O interaction becomes stronger until the formation of Ni x Mg (1-x) O solid solution. The presence of Mg 2+ ions allows a higher carbon capacity (C/Ni, number of CH 4 molecules converted per Ni atom until complete catalyst deactivation) and consequently a higher H 2 productivity of the Ni based systems which results in a smoothing effect of the unavoidable declining activity trend even if it does not affect the tip growth coking mechanism.

show abstract

ChemInform Abstract: Magnesia‐Supported Nickel Catalysts. Part 1. Factors Affecting the Structure and Morphological Properties.

Cited by 7 publications

References 1 publication

A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Expansion and shrinkage in the redox process of (Mg,Ni)O solid solutions for preparation of steam reforming catalysts in SOFCs

Catalytic Features of Mg Modified Ni/SiO2/Silica Cloth Systems in the Decomposition of Methane for Making “CO x -Free” H2

Contact Info

Product

Resources

About