Study of chemisorption and thermal desorption of hydrogen on applied rhenium catalysts

Миначев, Х. М.; Avaev, V. I.; Dmitriev, R. V.; Ryashentseva, M. A.

doi:10.1007/bf00956502

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“…These affected both the oxidized state of Re and its structural, electronic, and adsorption characteristics, thus explaining the differences in the chemisoption properties of the samples prepared by the two methods. In the same time, the different temperatures of H 2 desorption are associated with the existence of several chemisorbed forms . According to literature reports, both surface and volume defects are formed during the thermal reduction.…”

Section: Resultsmentioning

confidence: 95%

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Highly Efficient, Easily Recoverable, and Recyclable Re–SiO₂–Fe₃O₄ Catalyst for the Fragmentation of Lignin

Tudorache

Opris

Cojocaru

et al. 2018

ACS Sustainable Chem. Eng.

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A series of Fe 3 O 4 @SiO 2 @Re catalysts were prepared by deposition of rhenium by means of the precipitation−deposition and impregnation procedures. Characterization of the catalysts confirmed that the deposition of silica protected the magnetite nanoparticles, resulting in a stable SiO 2 @Fe 3 O 4 composite, which was not affected by the treatments during the further deposition of rhenium. Rhenium was silent in XRD over the range of concentrations, at which it was deposited. Furthermore, XPS detected rhenium, only in the impregnation series; this may confirm that dispersion was high. As expected, rhenium was not reduced to the metallic state and generated weakly acidic Brønsted-type centers as detected by NH 3 -TPD. H 2 -TPD and chemisorption experiments demonstrate the capacity of these catalysts to chemisorb hydrogen. In line with these properties, rhenium catalyzed both C−C hydrogenolysis and C−O hydrolysis in successive steps. The performance of these catalysts was checked for a series of lignins of different origin and by means of different separation procedures. A very important finding is that these catalysts were highly stable and easy to recover.

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Section: Resultsmentioning

confidence: 95%

“…In the same time, the different temperatures of H 2 desorption are associated with the existence of several chemisorbed forms. 39 According to literature reports, both surface and volume defects are formed during the thermal reduction. These can serve as traps for hydrogen that is released at higher temperatures.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO₂–Fe₃O₄ Catalyst for the Fragmentation of Lignin

Tudorache

Opris

Cojocaru

et al. 2018

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

Study of chemisorption and thermal desorption of hydrogen on applied rhenium catalysts

Cited by 1 publication

References 5 publications

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO₂–Fe₃O₄ Catalyst for the Fragmentation of Lignin

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO₂–Fe₃O₄ Catalyst for the Fragmentation of Lignin

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Study of chemisorption and thermal desorption of hydrogen on applied rhenium catalysts

Cited by 1 publication

References 5 publications

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO2–Fe3O4 Catalyst for the Fragmentation of Lignin

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO2–Fe3O4 Catalyst for the Fragmentation of Lignin

Contact Info

Product

Resources

About

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO₂–Fe₃O₄ Catalyst for the Fragmentation of Lignin

Highly Efficient, Easily Recoverable, and Recyclable Re–SiO₂–Fe₃O₄ Catalyst for the Fragmentation of Lignin