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Mihaylov, Mihail; Hadjiivanov, Konstantin; Knözinger, Helmut

doi:10.1023/a:1016786023456

Cited by 91 publications

(74 citation statements)

References 20 publications

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“…2047 cm -1 [22][23][24]. In a recent study of Derrouiche and Bianchi [25], they studied the IR spectra of 1% CO/He adsorption on 20% Ni/Al 2 O 3 , which is similar to our conditions.…”

Section: Ir Study Of Co Adsorptionmentioning

confidence: 61%

“…Generally, the high frequency band at 2100-2000 cm -1 can be assigned to linear adsorbed CO on Ni 0 , and the low frequency band at 2000-1750 cm -1 is attributed to two or three fold bridge adsorbed CO on Ni 0 [13][14][15][16][17][18][19][20][21][22][23][24][25]. The band at 2058 cm -1 is initially more intense than the band at 2082 cm -1 .…”

Section: Ir Study Of Co Adsorptionmentioning

confidence: 99%

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CO Adsorbed Infrared Spectroscopy Study of Ni/Al2O3 Catalyst for CO2 Reforming of Methane

2007

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CO adsorbed infrared spectroscopy study was conducted in this work in order to better understand the significantly improved anti-coke performance of Ni/Al 2 O 3 catalyst obtained via argon glow discharge plasma treatment. The present study revealed a significant decrease of linear to bridge (L/B) adsorbed CO for glow discharge plasma treated Ni/Al 2 O 3 , compared to that for untreated Ni/Al 2 O 3 , indicating an enhancement of close packed plane concentration. This structure change leads to lower methane turnover frequency (TOF) and better balance of carbon formation-gasification, resulting in better anti-coke property of Ni/Al 2 O 3 for CO 2 reforming of methane.

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“…2047 cm -1 [22][23][24]. In a recent study of Derrouiche and Bianchi [25], they studied the IR spectra of 1% CO/He adsorption on 20% Ni/Al 2 O 3 , which is similar to our conditions.…”

Section: Ir Study Of Co Adsorptionmentioning

confidence: 61%

Section: Ir Study Of Co Adsorptionmentioning

confidence: 99%

CO Adsorbed Infrared Spectroscopy Study of Ni/Al2O3 Catalyst for CO2 Reforming of Methane

2007

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“…Figure 4 shows a spectrum obtained following CO adsorption on Ni nanoparticle rods ([100 nm in length and diameter of 20 nm). The CO FTIR spectrum displays an intense vibrational feature at *2040 cm -1 which is characteristic of CO adsorbed on Ni [27][28][29][30][31][32][33][34][35]. The observation of vibrations associated with CO on Ni is a significant result because it confirms that CO, a key component of synthesis gas, can penetrate the protective silica core to access the metallic core.…”

Section: Resultsmentioning

confidence: 80%

Synthesis of Nanorods with Ni Cores and Porous Silica Coatings

et al. 2011

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Nanorods with a Ni core and a silica coating have been prepared using a one-step synthesis and characterized using a variety of methods. Nitrogen adsorption isotherms have been used to characterize the pore size and the internal surface area of the silica shells grown on the Ni nanorods. Spectroscopic characterization of CO adsorbed on the Ni nanoparticle cores has been used to verify that the pore structure of the silica shells allows CO to access the Ni core; this property is critical to the use of core-shell structures as industrial catalysts. To demonstrate their resistance to physical and chemical degradation, the properties of the silica-coated Ni nanoparticles have been measured both before and after treatment at high temperature (623 -1073 K) and exposure to a reducing atmosphere (hydrogen gas). Annealing at high temperatures reduces, but does not eliminate, the porosity of the silica shells.

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“…The strong absorption peak at 2,062 cm -1 can be assigned to Ni(CO) 4 [27,28], while the absorption peaks at 1,990 and 2,019 cm -1 may be assigned to NiCO and Ni(CO) 3 , respectively [29]. The formation of Ni(CO) 4 was thermodynamically feasible at pressures higher than 1 Pa and temperatures lower than 523 K [27,[30][31][32]. It was reported that Ni(CO) 4 was easily formed on the highly dispersed Ni due to the structural defects [28,[33][34][35].…”

Section: Energetic Interactions Of H 2 and Co With Highlymentioning

confidence: 98%

“…The peaks at 2,120 and 2,172 cm -1 belong to gaseous CO. The strong absorption peak at 2,062 cm -1 can be assigned to Ni(CO) 4 [27,28], while the absorption peaks at 1,990 and 2,019 cm -1 may be assigned to NiCO and Ni(CO) 3 , respectively [29]. The formation of Ni(CO) 4 was thermodynamically feasible at pressures higher than 1 Pa and temperatures lower than 523 K [27,[30][31][32].…”

Section: Energetic Interactions Of H 2 and Co With Highlymentioning

confidence: 99%

Dispersion of Nano Nickel Particles over SBA-15 Modified by Carbon Films on Pore Walls

et al. 2009

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Mesoporous SBA-15 was prepared by using P123 as a template. The precursor with the template was calcined in an inert atmosphere so that carbon films might be formed in pores of SBA-15 due to the decomposition of template. The SBA-15C thus formed contained 3% C and exhibited similar pore structures as the SBA-15. Both SBA-15 and SBA-15C were used to support 20% nickel (by weight) via impregnation. It was found that doping with carbon films enhanced the dispersion of supported nickel. However, calcination at high temperatures before the reduction had a negative effect on the dispersion of nickel. The un-calcined 20%Ni/SBA-15C after the reduction in H 2 at 673 K exhibited the highest dispersion of nickel (42%) and smallest average particle size of about 2.4 nm, in the catalysts studied in this work. It was also the most active catalyst for the hydrogenation of toluene to methyl cyclohexane. Conversion of toluene could be detected even at room temperature and atmospheric pressure for the catalyst in a fix-bed reactor, and 100% conversion of toluene was reached when temperature was raised to 358 K.

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Cited by 91 publications

References 20 publications

CO Adsorbed Infrared Spectroscopy Study of Ni/Al2O3 Catalyst for CO2 Reforming of Methane

CO Adsorbed Infrared Spectroscopy Study of Ni/Al2O3 Catalyst for CO2 Reforming of Methane

Synthesis of Nanorods with Ni Cores and Porous Silica Coatings

Dispersion of Nano Nickel Particles over SBA-15 Modified by Carbon Films on Pore Walls

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