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- 01HAAQEM4S86D9TP17NVDH5H9F classification C3.
- 01HAAQEM4S86D9TP17NVDH5H9F date "2023".
- 01HAAQEM4S86D9TP17NVDH5H9F language "eng".
- 01HAAQEM4S86D9TP17NVDH5H9F type conference.
- 01HAAQEM4S86D9TP17NVDH5H9F hasPart 01HAAR22G8E4M9C3Q63VHYWVJX.docx.
- 01HAAQEM4S86D9TP17NVDH5H9F subject "Chemistry".
- 01HAAQEM4S86D9TP17NVDH5H9F presentedAt urn:uuid:f50c624e-1afc-408f-8684-60022bd65bc2.
- 01HAAQEM4S86D9TP17NVDH5H9F abstract "As much as 40% of all chemicals contain an aromatic moiety[1]. Currently, the main supplier of these compounds is the petrochemical industry, still one of the main sources of environmental pollution[2]. With the worsening climate change crisis and the depletion of fossil feedstocks, finding alternative sources for aromatics becomes imperative. The indigestible aromatic biopolymer lignin is the most promising candidate as it is the largest renewable source of aromatic compounds in nature[3]. Furthermore, lignin allows the straightforward derivation of functionalized aromatics, which can be used directly for multiple industrial applications; e.g., polymers, resins, foams, and dyes, thereby also replacing toxic components such as bisphenol A and phenol[4]. Mild reductive depolymerization is a highly favoured valorisation strategy due to its sustainable nature and superior selectivity to functionalized aromatics; however, the efficiency of this method is hindered by slow depolymerization rates in addition to limited insights in the depolymerization mechanism[5]. To overcome the latter, highly performant redox catalysts are needed for the selective cleavage of lignin’s beta-O-4 linkages [5], [6]. By studying the complex product pool after reaction, the depolymerization process can also be elucidated. In this work, both monometallic 5 w% Pd and 5 w% Pd-Cu nanoparticles are extensively studied on three different supports: γ-Al2O3, SiO2, and active carbon (AC). Both in-depth catalyst characterization (ICP, NH3-TPD, TEM-EDX, CO-chemisorption) and product pool analysis are performed (GPC, GC-MS, GPC-HPLC-UV/VIS, Py-GCxGC-MS and 2D-NMR). Results show that Pd-AC exhibits unique selectivity as well as the highest catalytic activity with a reduction in molecular weight of more than 80% after 6h, compared to 70% for Pd/γ-Al2O3 and Pd/SiO2. Moreover, the effect of Cu on Pd is found to be dependent on the support: the presence of Cu improves the activity of Pd on γ-Al2O3 and SiO2 and it also alters their selectivity. In contrast, the effect of Cu on the activity Pd/AC is negligible; however, it further boosts the catalyst’s selectivity towards a more deoxygenated and less hydrogenated product pool. Additionally, a two-step beta-O-4 cleavage mechanism is proposed, further substantiated by the use of model compounds. Bibliography [1] Biorizon, “Biobased aromatics: Europe leads the way,” Mar. 07, 2020. [2] M. Takht Ravanchi and S. Sahebdelfar, “Carbon dioxide capture and utilization in petrochemical industry: potentials and challenges,” Appl Petrochem Res, vol. 4, no. 1, pp. 63–77, May 2014, doi: 10.1007/s13203-014-0050-5. [3] Z. Sun, B. Fridrich, A. de Santi, S. Elangovan, and K. Barta, “Bright Side of Lignin Depolymerization: Toward New Platform Chemicals,” Chemical Reviews, vol. 118, no. 2. American Chemical Society, pp. 614–678, Jan. 24, 2018. doi: 10.1021/acs.chemrev.7b00588. [4] I. van Nieuwenhove, T. Renders, J. Lauwaert, T. de Roo, J. de Clercq, and A. Verberckmoes, “Biobased Resins Using Lignin and Glyoxal,” ACS Sustainable Chemistry and Engineering, vol. 8, no. 51. 2020. doi: 10.1021/acssuschemeng.0c07227. [5] W. Schutyser, T. Renders, S. van den Bosch, S. F. Koelewijn, G. T. Beckham, and B. F. Sels, “Chemicals from lignin: An interplay of lignocellulose fractionation, depolymerisation, and upgrading,” Chemical Society Reviews, vol. 47, no. 3. Royal Society of Chemistry, pp. 852–908, Feb. 07, 2018. doi: 10.1039/c7cs00566k. [6] A. Margellou and K. S. Triantafyllidis, “Catalytic transfer hydrogenolysis reactions for lignin valorization to fuels and chemicals,” Catalysts, vol. 9, no. 1. 2019. doi: 10.3390/catal9010043.".
- 01HAAQEM4S86D9TP17NVDH5H9F author 01EE3E14-F0EE-11E1-A9DE-61C894A0A6B4.
- 01HAAQEM4S86D9TP17NVDH5H9F author 26F69972-F0EE-11E1-A9DE-61C894A0A6B4.
- 01HAAQEM4S86D9TP17NVDH5H9F author 4206B480-AFC5-11E8-8BDC-B4165707D3EF.
- 01HAAQEM4S86D9TP17NVDH5H9F author 4EB1FBBA-5675-11E5-B03A-F334B5D1D7B1.
- 01HAAQEM4S86D9TP17NVDH5H9F author 7170D040-B25E-11E6-B104-2D2FD0AF0289.
- 01HAAQEM4S86D9TP17NVDH5H9F author F5548208-F0ED-11E1-A9DE-61C894A0A6B4.
- 01HAAQEM4S86D9TP17NVDH5H9F dateCreated "2023-09-14T20:52:19Z".
- 01HAAQEM4S86D9TP17NVDH5H9F dateModified "2024-07-09T15:43:14Z".
- 01HAAQEM4S86D9TP17NVDH5H9F name "Effects of the support and Cu as second metal on the performance of Pd catalysts in the mild reductive depolymerisation of Soda lignin".
- 01HAAQEM4S86D9TP17NVDH5H9F pagination urn:uuid:f366dc51-967a-4b08-93f4-04b8a1a068aa.
- 01HAAQEM4S86D9TP17NVDH5H9F sameAs LU-01HAAQEM4S86D9TP17NVDH5H9F.
- 01HAAQEM4S86D9TP17NVDH5H9F sourceOrganization urn:uuid:03309bd9-c571-4a47-ad06-18e8c7ccf9ef.
- 01HAAQEM4S86D9TP17NVDH5H9F type C3.