Mixed M2O3.ZRO2.SO4 2− (M=GA, IN, TL) Catalysts: Preparation, Characterisation and Catalytic Behaviour in Dehydroisomerisation of N-Hexane

This work establishes the primordial role played by the support’s nature when aimed at the constitution of Ni2P active phases for supported catalysts. Thus, carbon dioxide reforming of methane was studied over three novel Ni2P catalysts supported on Al2O3, CeO2 and SiO2-Al2O3 oxides. The catalytic performance, shown by the catalysts’ series, decreased according to the sequence: Ni2P/Al2O3 > Ni2P/CeO2 > Ni2P/SiO2-Al2O3. The depleted CO2 conversion rates discerned for the Ni2P/SiO2-Al2O3 sample were associated to the high sintering rates, large amounts of coke deposits and lower fractions of Ni2P constituted in the catalyst surface. The strong deactivation issues found for the Ni2P/CeO2 catalyst, which also exhibited small amounts of Ni2P species, were majorly associated to Ni oxidation issues. Along with lower surface areas, oxidation reactions might also affect the catalytic behaviour exhibited by the Ni2P/CeO2 sample. With the highest conversion rate and optimal stabilities, the excellent performance depicted by the Ni2P/Al2O3 catalyst was mostly related to the noticeable larger fractions of Ni2P species established.

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Oxygen defects-stabilized heterogeneous single atom catalysts: preparation, property and catalytic application

Journal of Materials Chemistry A ◽

10.1039/d0ta10541d ◽

2021 ◽

Author(s):

Lei Zhang ◽

Xiu-Fei Zhao ◽

Zhengqiu Yuan ◽

Ming Wu ◽

Hu Zhou

Keyword(s):

Electronic Structure ◽

Single Atom ◽

Metal Species ◽

Coordination Environment ◽

Chemical Catalysis ◽

Catalytic Application ◽

Oxygen Defects ◽

Catalysts Preparation

Single atom catalysts (SACs) show outstanding activity and selectivity in chemical catalysis owing to its unique electronic structure and unsaturated coordination environment, in which every dispersed metal species on support...

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Study of the catalytic behaviour of organo-aluminium compounds in polymerization of quaternary cyclic oxides

Polymer Science U S S R ◽

10.1016/0032-3950(79)90178-3 ◽

1979 ◽

Vol 21 (9) ◽

pp. 2366-2373 ◽

Cited By ~ 2

Author(s):

G.P. Aleksyuk ◽

Ye.B. Toporkova ◽

L.V. Alferova ◽

V.A. Kropachev

Keyword(s):

Catalytic Behaviour

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Characterization and Catalytic Behaviour of Co3(PO4)2–AlPO4 Catalysts

Adsorption Science & Technology ◽

10.1177/026361749801600405 ◽

1998 ◽

Vol 16 (4) ◽

pp. 285-293 ◽

Cited By ~ 5

Author(s):

M.R. Mostafa ◽

F.Sh. Ahmed

Keyword(s):

Pore Radius ◽

Surface Acidity ◽

Total Pore Volume ◽

Textural Properties ◽

Acid Sites ◽

Adsorption Of Nitrogen ◽

Amorphous Structures ◽

Ft Ir ◽

Catalytic Behaviour ◽

The Mean

Co3(PO4)2, AlPO4 and the binary system Co3(PO4)2-AlPO4 with different compositions were prepared by the coprecipitation method. The structural properties of these samples were determined using XRD, DTA and FT-IR techniques. The textural properties were determined from the adsorption of nitrogen at 77 K. The surface acidity was measured by a calorimetric titration method. The samples were tested as catalysts in the dehydration of ethanol and isopropanol using a pulse microcatalytic technique. The data obtained from XRD and FT-IR indicate the amorphous structures of the prepared catalysts. An increase in Co3(PO4)2 content led to a decrease in the surface area and in the total pore volume and an increase in the mean pore radius. The surface acidity of the catalyst depends on the chemical composition; the surface acidity increased with an increase in the AlPO4 content. The dehydration temperature and the distribution of acid sites are important parameters in determining the selectivity and activity of the catalyst.

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