The activity and stability of nickel/silica catalysts in water and methane reaction

Al-Ubaid, Abduraham S.

doi:10.1021/ie00077a013

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…In the presence of NH 3 /Ni mole ratio of 0, in Ni 2p3/2 spectrum (Fig. 4 (a), one peaks appeared at 854.5 eV could be judged to NiO, [41][42][43][44][45][46][47][48][49][50] similar to the above XRD and UV-vis results. In the presence of NH 3 /Ni mole ratio of 1~4, in Ni 2p3/2 spectra of Ni-grafted SBA-15 samples, only one peak at around 856.9 eV was observed, indicating that the formation of a chemical bond -O-Ni-O-Si-Obetween silicon and Ni via oxygen, no NiO particles existed, showing the formation of dispersed 2:1 nickel phyllosilicate.…”

Section: Synthesis Of Catalystssupporting

confidence: 73%

Grafting Ni particles onto SBA-15, and their enhanced performance for CO₂ methanation

Abe

et al. 2015

RSC Adv.

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By a post synthesis method, nickel (Ni) particles could be grafted onto SBA-15 for the first time through a chemical bond (-O-Ni-O-Si-O-) formation between silicon (Si) and Ni via oxygen (O) using Ni ammonia (NH3) complex ions (Ni(NH3)x) 2+ with NH3/Ni mole ratio of 1~5, which existed as Ni phyllosilicate on SBA-15 surface, while Ni particles could not be grafted onto SBA-15 in the absence of NH4OH (NH3/Ni mole ratio of 0). NH3/Ni mole ratio of 2~4 was suitable grafting conditions, which could give a product with the closest Ni amount to raw. This product obtained was named Ni-grafted SBA-15 sample. XPS, UV-vis and H2-TPR analyses demonstrated that a chemical bond was formed between Ni and silicon (Si) via oxygen (O), and no bulk nickel oxides existed in Ni-grafted SBA-15 sample. The formation of -O-Ni-O-Si-O-was completed via the reaction between hydrolyzate Ni(OH)(NH3)x-1) + from (Ni(NH3)x) 2+ and ≡Si-OH (silanol sites) on SBA-15 surface. Ni-grafted SBA-15 catalyst suited CO2 methanation, resulting in higher CO2 conversion and methane selectivity than NiO dispersed SBA-15 catalyst obtained by conventional post synthesis method. The activation energy for CO2 methanation increased with decreasing initial Ni amount used. The rate equation for CO2 methanation could be expressed as: r = kCCO 2 0.64 CH 2 4.05 , C was concentration. Ni-grafted SBA-15 catalyst had high thermal stability for CO2 methanation.

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Section: Synthesis Of Catalystssupporting

confidence: 73%

Grafting Ni particles onto SBA-15, and their enhanced performance for CO₂ methanation

Abe

et al. 2015

RSC Adv.

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“…Supports with strong Lewis basicity as TiO 2 , ZrO 2 [12][13][14] strong interactions between Ni and support lead to the formation of small Ni crystallites [15], and Ni in a spinel structure as NiAl 2 O 4 [16] can minimize carbon deposit. Moreover, the Ni/Al 2 O 3 systems with additives such as alkaline oxides (CaO, MgO) have also shown to be more resistant to coke formation [17][18].…”

Section: Introductionmentioning

confidence: 99%

Methane Steam Reforming on Supported Nickel Based Catalysts. Effect of Oxide ZrO2, La2O3 and Nickel Composition

Belhadi¹,

Trari²,

Rabia³

et al. 2013

OJPC

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The catalytic properties of Ni (4 and 10 wt%) supported on both La 2 O 3 and ZrO 2 were investigated for the methane steam reforming reaction between 475˚C and 700˚C at atmospheric pressure. The catalysts were prepared by the impregnation method and characterized by several techniques (atomic absorption, BET method, X-ray diffraction and TG-TPO). The catalytic activity of Ni/support systems strongly depends on both of the nature and physico-chemical properties of the support. No deactivation was observed in catalytic systems, whatever the reaction temperature indicating high stability of the catalyst.

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“…The intensity ratio, i.e., the ratio of the peak areas of cadmium (3d 3/2 ) and aluminum (2p), of each catalyst was also calculated, and its values are reported in Table . The intensity ratio is a function of dispersion as well as relative concentration of the active ingredients on the surface. ,, Thus, a better dispersion and a higher concentration of CdS would yield a higher value, for the Cd/Al intensity ratio. It is seen from the table that, despite much larger crystallite size, the Cd/Al ratio for catalyst 1 is much higher than that of catalyst 2.…”

Section: Resultsmentioning

confidence: 99%

Activity of Cadmium Sulfide Photocatalysts for Hydrogen Production from Water: Role of Support

Arora

Sahu

Upadhyay

et al. 1999

Ind. Eng. Chem. Res.

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Alumina-supported cadmium sulfide photocatalysts for reduction of water to hydrogen were prepared by different techniques and characterized. The band gap, the dispersion of cadmium sulfide, and the contact between cadmium sulfide and alumina are affected by the preparation technique. Those preparation techniques that promote better dispersion of cadmium sulfide and give rise to a chemical interaction between cadmium sulfide and alumina impart a superior activity to the catalyst. The chemical interaction leads to decoration of cadmium sulfide surface by alumina which results in an intimate contact between them. Catalyst prepared by coprecipitation shows the intimate contact but has a poor dispersion of cadmium sulfide, whereas impregnation of alumina hydrogel results in a catalyst having both intimate contact between alumina and cadmium sulfide and better dispersion of cadmium sulfide; consequently, this results in enhanced activity.

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The activity and stability of nickel/silica catalysts in water and methane reaction

Cited by 12 publications

References 7 publications

Grafting Ni particles onto SBA-15, and their enhanced performance for CO₂ methanation

Grafting Ni particles onto SBA-15, and their enhanced performance for CO₂ methanation

Methane Steam Reforming on Supported Nickel Based Catalysts. Effect of Oxide ZrO<sub>2</sub>, La<sub>2</sub>O<sub>3</sub> and Nickel Composition

Activity of Cadmium Sulfide Photocatalysts for Hydrogen Production from Water: Role of Support

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The activity and stability of nickel/silica catalysts in water and methane reaction

Cited by 12 publications

References 7 publications

Grafting Ni particles onto SBA-15, and their enhanced performance for CO2 methanation

Grafting Ni particles onto SBA-15, and their enhanced performance for CO2 methanation

Methane Steam Reforming on Supported Nickel Based Catalysts. Effect of Oxide ZrO&lt;sub&gt;2&lt;/sub&gt;, La&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; and Nickel Composition

Activity of Cadmium Sulfide Photocatalysts for Hydrogen Production from Water: Role of Support

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Grafting Ni particles onto SBA-15, and their enhanced performance for CO₂ methanation

Grafting Ni particles onto SBA-15, and their enhanced performance for CO₂ methanation

Methane Steam Reforming on Supported Nickel Based Catalysts. Effect of Oxide ZrO<sub>2</sub>, La<sub>2</sub>O<sub>3</sub> and Nickel Composition