CO2 hydrogenation on iron-containing mono- and bimetallic catalysts

Zakumbaeva, G. D.; Urumbaeva, Sh. U.; Nigmetova, D. T.; Khisametdinov, A. M.; Kuanyshev, A. Sh.

doi:10.1007/bf02069212

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(2 citation statements)

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“…The spectrum displays multiple bands between 1050 and 3010 cm −1 . The different species found at the surface of the catalyst during reaction include: La2O2CO3 (1050 cm −1 ) [46], unidentate formates on the Ni surface (1305 and 1607 cm −1 ) [47], formates on the La2O3 surface (1350 and 1500 cm −1 ) [40], bidentate formates on the γ-Al2O3 support (1375, 1395, 1590, and 3010 cm −1 ) [47], adsorbed CO on Ni in bridge configuration (1860 and 1910 cm −1 ) [47,48], adsorbed CO on Ni in linear configuration (2030 cm −1 ) [47,48], and adsorbed/gaseous CO2 (2320 and 2360 cm −1 ). Conversion of CO2 into CH4 during reaction was corroborated by the presence of the characteristic multi-peak bands observed at ca.…”

Section: Reaction Routesmentioning

confidence: 99%

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An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

et al. 2016

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LaNi 5 , known for its hydrogen storage capability, was adapted to the form of a metal oxide-supported (γ-Al 2 O 3 ) catalyst and its performance for the Sabatier reaction assessed. The 20 wt % La-Ni/γ-Al 2 O 3 particles were prepared via solution combustion synthesis (SCS) and exhibited good catalytic activity, achieving a CO 2 conversion of 75% with a high CH 4 selectivity (98%) at 1 atm and 300 • C. Characteristics of the La-Ni/γ-Al 2 O 3 catalyst were identified at various stages of the catalytic process (as-prepared, activated, and post-reaction) and in-situ DRIFTS was used to probe the reaction mechanism. The as-prepared catalyst contained amorphous surface La-Ni spinels with particle sizes <6 nm. The reduction process altered the catalyst make-up where, despite the reducing conditions, Ni 2+ -based particles with diameters between 4 and 20 nm decorated with LaO x moieties were produced. However, the post-reaction catalyst had particle sizes of 4-9 nm and comprised metallic Ni, with the LaO x decoration reverting to a form akin to the as-prepared catalyst. DRIFTS analysis indicated that formates and adsorbed CO species were present on the catalyst surface during the reaction, implying the reaction proceeded via a H 2 -assisted and sequential CO 2 dissociation to C and O. These were then rapidly hydrogenated into CH 4 and H 2 O.

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Section: Reaction Routesmentioning

confidence: 99%

“…An example of in-situ DRIFTS analysis profile for the La-Ni/γ-Al 2 O 3 catalyst immediately following a H 2 pulse is provided in Figure 6a [47,48], and adsorbed/gaseous CO 2 (2320 and 2360 cm −1 ). Conversion of CO 2 into CH 4 during reaction was corroborated by the presence of the characteristic multi-peak bands observed at ca.…”

Section: Reaction Routesmentioning

confidence: 99%