Selective hydrogenation of CO 2 into CO on a highly dispersed nickel catalyst obtained by magnetron sputtering deposition: A step towards liquid fuels

A B S T R A C T Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has all the criteria of a catalyst support, in particular its high thermal stability. However it is still less studied in the heterogeneous catalysis. For the first time, hydroxyapatite supported bimetallic Co-Ni catalysts were prepared and evaluated in the dry reforming of methane (DRM) process. Nanoparticles containing both nickel and cobalt were well formed on the surface of HAP by conventional impregnation methods. No modification of HAP structure was observed after metals deposition. DRM reaction was carried out at 700-750°C and around 1.6 bar, using a fixed-bed reactor which was fed with a mixture of 20%vol CH 4 , 20%vol CO 2 and 60%vol N 2 . CH 4 and CO 2 conversion reached up to 60 and 68% at 700°C, respectively, and 73 and 79% at 750°C, respectively during long reaction times of 50-160 h. Water as a by-product could be quantified along the catalytic reaction indicating the implication of reverse water-gas-shift reaction. TEM-EDX analysis of the used catalysts recovered after catalytic tests showed that coke deposition was limited and there was slight modification of metals particle size. The results obtained were very promising for the design of an efficient catalytic system for DRM process.

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“…8). In the literature, Ni-and Co-based catalysts were well reported as efficient catalysts for RWGS [50,51].…”

Section: Catalytic Performancementioning

confidence: 99%

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Phan

Sane

Vasconcelos

et al. 2018

Applied Catalysis B: Environmental

139

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“…It is well recognized that the size of gold nanoparticles determines both the activity and the selectivity of the final catalyst [4,5]. It is also considered that the drastic change of the catalytic properties of nanoparticles is due to their new properties (physical and chemical) which are created when their size decreases, mainly due to the significant increase in the number of atoms on the surface [5][6][7]. However, when working with supported gold nanoparticles (NPs), the support also plays a very important role.…”

Section: Introductionmentioning

confidence: 99%

Furfural Oxidation on Gold Supported on MnO2: Influence of the Support Structure on the Catalytic Performances

et al. 2018

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Featured Application: The catalysts developed in this work could be potentially used industrially for green oxidations of bio-based compounds.Abstract: A series of catalysts consisting of gold nanoparticles supported on MnO 2 presenting different morphologies were synthesized and tested in the base-free oxidation of furfural. Ultra-small Au particles (less than 3 nm) were deposited on low (commercial MnO 2 ) and high (NF, nanoflowers and NW, nanowires MnO 2 ) surface area supports. High activity was observed for Au/MnO 2 -NF material with very high selectivity to furoic acid. The X-ray photoelectron spectroscopy (XPS) study confirmed the presence of a significant amount of highly active Au δ+ species on the surface of the Au/MnO 2 -NF catalyst. These species seem to be responsible for the high activity in oxidation of furfural under mild conditions (air as oxidant, 110 • C).

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“…36,37 Aside from methanol, reverse water gas shift (RWGS) and CO2 methanation reactions can generate other chemicals such as carbon monoxide (CO) and methane (CH4), respectively, which are important building blocks for a wide range of commodities. 36,38,39 For instance, a variety of products such as olefins, gasoline, and diesel, as well as oxygenates (e.g. methanol) can be obtained from syngas (CO + H2) using the well-established technology of Fischer−Tropsch synthesis (FTS).…”

Section: Hydrogenation Of Carbon Dioxide (Co2)mentioning

confidence: 99%

“…36,89,117,118 Although there have been reports showing that Ni supported catalysts with high selectivity towards CO can be obtained by alloying Ni with other metals such as iron (Fe) or even by using Ni nanoparticles smaller than 2nm, these results cannot be properly compared to our catalyst system. 36,38,119 This is because our prepared NiO nanoparticles are about 10nm in diameter and, at least in principle, no alloying process on Ni was 54 utilized. The activity per unit nickel was observed to decrease with increasing Ni concentration (figure 13d).…”

Section: Co/zno and Ni/zno Catalysts For Co2 Hydrogenationmentioning

confidence: 99%

“…,87 Low-pressure CO2 hydrogenation processes are more economically attractive with lower installation and operation (pumping) costs. Thus, a key approach to achieve an effective utilization of CO2 via both RWGS and CO2 methanation at such working conditions is replacing Cu with more active, but nonprecious, metal components.Several studies using other oxide-supports have shown that earth-abudant 3d transition metals such as cobalt (Co) and nickel (Ni) are promising canditates for achieving such goal 36,38,[88][89][90][91]. However, the promotional effects of ZnO, which is known to possess extensive vacancy defects that can affect its interactions with supported nanoparticles, in CO and CH4 synthesis over Co/ZnO or Ni/ZnO catalysts have not yet been addressed and thus are still not fully understood 66,92.…”

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confidence: 99%

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Catalysts based on transition metals for applications in energy conversion

Araújo¹

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Energy conversion processes such as the water splitting and CO2 hydrogenation reactions have emerged as attractive approaches to mitigate environmental concerns on CO2 emissions as well as to provide an alternative source of renewable fuels. These strategic processes can capitalize on the energy of renewable resources (e.g solar and wind) to drive chemical reactions to generate, in a green and sustainable way, fuels and value-added chemicals. Economically feaseable heterogeneous catalysts play a central role in advancing such processes for globally-relevant production scales. Hence, in this work, we focused on the synthetic development of several catalyst systems based on cost-effective earth-abudant 3d transition metals such as nickel (Ni), cobalt (Co), iron (Fe) and zinc (Zn). Specifically, we turned our attention to produce a series of catalysts comprised of: i) NiFe oxyhydroxide supported on carbon for application in oxygen evolution reaction (OER), a bottleneck reaction for the water splitting process, and ii) Ni and Co nanoparticles supported on Zinc oxide (ZnO) for the CO2 hydrogenation reaction. Regarding the NiFe oxyhydroxide systems, we evaluated the catalytic performance of these materials towards the OER and benchmarked those with that of state-of-the-art OER electrocatalyts such as Ir/C. In addition to that, we also focused on rationalizing the key reasons for the significant enhancements in OER activity of such catalysts in terms of their surface and bulk compositions. For Co/ZnO and Ni/ZnO catalysts, aside from assessing their catalytic activity and selectivity behavior, we performed a systematic investigation of the catalytically important properties of such catalyst interfaces under typical CO2 hydrogenation reaction conditions using in situ ambient pressure X-ray photoelectron spectroscopy (AP-XPS). This allowed us to acquire important knowledge into the origin and the nature of the active sites associated with the catalytic activity and selectivity in these materials.

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Selective hydrogenation of CO 2 into CO on a highly dispersed nickel catalyst obtained by magnetron sputtering deposition: A step towards liquid fuels

Cited by 88 publications

References 50 publications

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Furfural Oxidation on Gold Supported on MnO2: Influence of the Support Structure on the Catalytic Performances

Catalysts based on transition metals for applications in energy conversion

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