Oxidative Depolymerisation of Lignosulphonate Lignin into Low-Molecular-Weight Products with Cu–Mn/δ-Al2O3

Abdelaziz, Omar Y.; Meier, Sebastián; Prothmann, Jens; Turner, Charlotta; Riisager, Anders; Hulteberg, Christian

doi:10.1007/s11244-019-01146-5

Cited by 26 publications

(21 citation statements)

References 30 publications

(36 reference statements)

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“…Lignin is the second most abundant natural polymer in nature and is therefore believed to have considerable potential as a value-added feedstock [1,2]. Catalytic hydrotreating processes using traditional Mo-based catalysts promoted by Ni or Co have been found to be promising in upgrading lignin and other biomass-based feedstocks into high-quality fuel [3,4,5,6]. Mo-based catalysts have played an essential role in the hydrotreating reaction in the petrochemical industry for several decades and have, therefore, been studied in in-depth [7], however, we still do not have a complete understanding of the active site of the bimetallic catalyst.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Nanoparticles as a Model System for an Industrial NiMo Catalyst

et al. 2019

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An in-depth understanding of the reaction mechanism is required for the further development of Mo-based catalysts for biobased feedstocks. However, fundamental studies of industrial catalysts are challenging, and simplified systems are often used without direct comparison to their industrial counterparts. Here, we report on size-selected bimetallic NiMo nanoparticles as a candidate for a model catalyst that is directly compared to the industrial system to evaluate their industrial relevance. Both the nanoparticles and industrial supported NiMo catalysts were characterized using surface- and bulk-sensitive techniques. We found that the active Ni and Mo metals in the industrial catalyst are well dispersed and well mixed on the support, and that the interaction between Ni and Mo promotes the reduction of the Mo oxide. We successfully produced 25 nm NiMo alloyed nanoparticles with a narrow size distribution. Characterization of the nanoparticles showed that they have a metallic core with a native oxide shell with a high potential for use as a model system for fundamental studies of hydrotreating catalysts for biobased feedstocks.

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Section: Introductionmentioning

confidence: 99%

Bimetallic Nanoparticles as a Model System for an Industrial NiMo Catalyst

et al. 2019

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“…4,24,25 A wide range of homogeneous and heterogeneous catalysts has previously been evaluated, including metal salts, metal oxides, coordination complexes, composites of metal oxides, polyoxometalates, organometallics, metal-organic frameworks, organocatalysts and enzymes. 8,12,21,[26][27][28] However, the nature of the obtained compounds is dependent on the used lignin (or lignin model compound), reaction conditions and media or oxidant. Therefore, it is rather difficult to effectively compare the performance of the aforementioned catalysts.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Oxidative depolymerization of Kraft lignin to high-value aromatics using a homogeneous vanadium–copper catalyst

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Abdelaziz

Meier

et al. 2021

Catal. Sci. Technol.

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“…In addition, the signal intensity appeared to be lower in the spent catalyst. This behavior is usually attributed to the formation of an uneven top-layer with the island of metallic nanoparticles generated on the support surface after the sulfide process on the catalyst [33]. The XRD patterns of fresh and spent catalysts are in Figure 5.…”

Section: Nimo/γ-al 2 O 3 Catalystmentioning

confidence: 99%

Molybdenum and Nickel Nanoparticles Synthesis by Laser Ablation towards the Preparation of a Hydrodesulfurization Catalyst

et al. 2020

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A clean straightforward laser ablation method in deionized (DI) water is reported for the synthesis of Molybdenum (Mo) and Nickel (Ni) nanoparticles (NPs). The structural, morphological, and optical properties of the as-synthesized nanoparticles were investigated. Particle size was estimated to be less than 10 nm, the UV–vis spectra of the samples show the formation of H2MoO4 and NiO. The XRD results for the Ni sample show the presence of two phases, cubic nickel oxide, and an fcc metallic nickel phase, indicating the possible formation of Ni/NiO compound. The nanoparticles synthesized were used as precursors in the production of a NiMo/γ-Al2O3 catalyst. The textural and structural properties, chemical composition, and catalytic performance in a hydrodesulfurization (HDS) reaction are reported. The textural and structural properties results show the lack of pore-blocking due to the small sizes and the distribution of the metallic nanoparticles on the support. Chemical composition measured by XPS shows a ratio Ni/Mo of 1.34. Therefore, possibly Ni was deposited on Mo covering part of its active area, occupying active sites of Mo, removing its effective surface and resulting in a relatively low conversion of DBT (17%). A lower Ni/Mo ratio is required to improve the model system, which could be achieved by changing parameters at the production of the nanoparticles. The model system can also be further tuned by changing the size of the nanoparticles.

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Oxidative Depolymerisation of Lignosulphonate Lignin into Low-Molecular-Weight Products with Cu–Mn/δ-Al2O3

Cited by 26 publications

References 30 publications

Bimetallic Nanoparticles as a Model System for an Industrial NiMo Catalyst

Bimetallic Nanoparticles as a Model System for an Industrial NiMo Catalyst

Oxidative depolymerization of Kraft lignin to high-value aromatics using a homogeneous vanadium–copper catalyst

Molybdenum and Nickel Nanoparticles Synthesis by Laser Ablation towards the Preparation of a Hydrodesulfurization Catalyst

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