One-pot reductive liquefaction of sawdust to renewables over MoO x -Al 2 O 3 variants: insight into structure-activity relationships

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One-pot reductive liquefaction of sawdust to renewables over MoO x -Al 2 O 3 variants: insight into structure-activity relationships

Salam, Muhammad Abdus, 1983 (author): Chalmers tekniska högskola,Chalmers University of Technology

Tran, Quoc Khanh, 1992 (author): Chalmers tekniska högskola,Chalmers University of Technology

Ho, Hoang Phuoc, 1983 (author): Chalmers tekniska högskola,Chalmers University of Technology

Cheah, You Wayne, 1993 (author): Chalmers tekniska högskola,Chalmers University of Technology

Wojtasz-Mucha, Joanna, 1989 (author): Chalmers tekniska högskola,Chalmers University of Technology

Kugge, Christian (author): SCA Research AB

Nejadmoghadam, Elham, 1984 (author): Chalmers tekniska högskola,Chalmers University of Technology

Olsson, Louise, 1974 (author): Chalmers tekniska högskola,Chalmers University of Technology

Creaser, Derek Claude, 1966 (author): Chalmers tekniska högskola,Chalmers University of Technology

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2024
2024
English.
In: Sustainable Energy and Fuels. - 2398-4902. ; 8:12, s. 2668-2681

Related links:: https://research.cha... (primary) (free); show more...; https://research.cha...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Valorization of forest residual products can offer a vital pathway to derive bio-based chemicals and fuel components. Herein, we report the effective and direct conversion of sawdust biomass over a supported Mo-oxide catalyst that results in a dominant fraction of aliphatic/cyclic alkanes and alkylbenzenes with low residual solids. The reductive liquefaction was conducted in an autoclave reactor using a series of MoOx-Al2O3 variants in the range of 340-400 °C with an initial H2 pressure of 35 bar for 4 h. At 340 °C, a correlation between Mo-loadings and reactivity for depolymerization and hydrodeoxygenation was found optimal for a surface density of 3.2 Mo-atoms per nm2 corresponding to 8 wt% Mo-loading. The liquefied fraction showed high selectivity (∼38%) for the formation of cycloalkanes and alkylbenzenes. At higher temperatures (400 °C) enhanced reactivity over the optimal catalyst showed higher cycloalkane and alkylbenzenes formation (∼57%) at a low biomass-to-catalyst feed mass ratio (3 : 1). At a higher ratio (10 : 1), alkylphenols (∼41%) are the leading product fraction followed by cycloalkanes and alkylbenzenes (∼34%) with a high liquefied monomer bio-oil product yield of 39.4 wt%. Catalyst characterization via XRD, Raman, H2-TPR, and XPS analysis revealed that the origin for this reactivity arises from the Mo species formed and stabilized over the support surface. A well dispersed, octahedral, higher fraction of easily reducible Mo-species (Mo5+) was evident over the optimal catalyst which enables enhanced C-O cleavage facilitating the hydrodeoxygenation reaction. Moreover, the solid residue yield could be reduced to below 5 wt% by optimizing the reaction conditions and particle size of the sawdust.

Subject headings

TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP -- Kemi -- Organisk kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Organic Chemistry (hsv//eng)

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Chemical Process ...

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