XPS study of coal liquefaction catalysts and catalyst impregnated coal

Kim, J.Y.; Reucroft, P. J.; Pradhan, V.R.; Wender, I.

doi:10.1016/0378-3820(93)90066-d

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…A Ti 2p 3/2 peak at 458.9 eV is shown, with 5.8 eV splitting between the Ti 2p 1/2 and Ti 2p 3/2 peaks. For Ti 4+ in TiO 2 , the Ti 2p 3/2 peak is at about 459.1 eV [14]. Thus, the surfaces of the asreceived Ti-6Al-4V powder and EDS compact are primarily in the form of TiO 2 .…”

Section: Resultsmentioning

confidence: 98%

Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

Lee

Hyun

2007

Applied Surface Science

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Section: Resultsmentioning

confidence: 98%

Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

Lee

Hyun

2007

Applied Surface Science

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“…The graphitization path of the carbon and the hybrid defects of the carbon structure can be observed by Raman spectrum [54][55][56]. X-ray photoelectron spectroscopy (XPS) can analyze the chemical composition of the surface and has been widely used in the characterization of coal and carbon materials [57][58][59]. Fourier transform infrared spectroscopy (FTIR) can well identify the functional groups in coal and materials.…”

Section: Introductionmentioning

confidence: 99%

Study on the microstructure of the symbiosis of coal-based graphene and coal-based graphene quantum dots: preparation and characterization

Li¹,

Tang²,

Che³

et al. 2022

Nanotechnology

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Coal-based graphene sheets (GS) and coal-based graphene quantum dots (GQDs) are usually prepared separately. In this paper, symbiosis of coal-based GS and coal-based GQDs was successfully prepared with our proposed preparation method by using three raw coals with different reflectance (collected from Qinshui coalfield, Shanxi Province) as carbon sources. The results showed that coal-based GS and coal-based GQDs can exist stably in the symbiosis and are distributed in different layers, and the GQDs are freely distributed between layers of GS. The average number of GS (N ave) in the three symbiosis is about 7 and the average interlayer spacing (d 002) is about 0.3887 nm. The average diameter of GQDs in the three symbiosis is about 4.255 nm and the average d 002 is about 0.230 nm. The average N ave of the three symbiosis was about 3 and the average d 002 is about 0.361 nm. The morphology and crystal parameters of symbiosis is more similar to that of graphene, the elements are only carbon and oxygen. In the prepared symbiosis, the higher the reflectance of raw coal, the smoother the lattice skeleton and the less vortex-layer structure of GS, and the larger the diameter and the denser the six membered ring of GQDs. The C and O functional groups of the prepared symbionts are similar. The higher the reflectance of coal, the higher the content of C–C/C=C. Under ultraviolet light, the prepared products all emit blue, and the higher the reflectance of coal, the higher the ultraviolet absorption, and the stronger the fluorescence intensity.

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“…The substance generally considered to be the most active iron-based liquefaction catalyst is the nonstoichiometric sulfide pyrrhotite, Fe 1 - x S − iron(III) oxide , and aerosols of iron oxides, iron(III) oxyhydroxide, , sulfated iron(III) oxide, ,, sulfated iron(III) oxyhydroxide, and a variety of other oxide and hydrous oxide phases . Since the iron oxides and sulfides are not soluble in common solvents, possibly making it difficult to achieve a good dispersion of small particles, so-called catalyst precursors can be used instead.…”

Section: Introductionmentioning

confidence: 99%

Hydrotreatment of 4-(1-Naphthylmethyl)bibenzyl in the Presence of Iron Catalysts and Sulfur

1996

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Catalytic hydrocracking of 4-(1-naphthylmethyl)bibenzyl (NMBB) predominantly yielded naphthalene and 4-methylbibenzyl. Various iron compounds were examined as catalyst precursors. Sulfur addition to most catalyst precursors led to substantially higher catalyst activity and higher conversion. NMBB was also treated with sulfur in the absence of iron compounds, in concentrations of 1.2-3.4 wt %, corresponding to the conditions present in reactions with added iron compounds. Increasing sulfur concentrations led to higher NMBB conversions. Furthermore, sulfur had a permanent effect on the reactor walls. A black sulfide layer formed on the surface which could not be removed mechanically. The supposed noncatalytic reactions done in the same reactor but after experiments with added sulfur showed higher conversions than comparable experiments done in new reactors. This wall catalytic effect can be reduced by treating the sulfided reactors with hydrochloric acid. The results of this work demonstrate the significant effect of sulfur addition and sulfur-induced residual wall effects on carbon-carbon bond cleavage and hydrogenation of aromatics.

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XPS study of coal liquefaction catalysts and catalyst impregnated coal

Cited by 10 publications

References 4 publications

Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

Study on the microstructure of the symbiosis of coal-based graphene and coal-based graphene quantum dots: preparation and characterization

Hydrotreatment of 4-(1-Naphthylmethyl)bibenzyl in the Presence of Iron Catalysts and Sulfur

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