Wang Jindong, Li Wenzhi, Wang Huizhen, Ogunbiyi Ajibola Temitope, Dou Xiaomeng, Ma Qiaozhi
Laboratory of Basic Research in Biomass Conversion and Utilization, Department of Thermal Science and Energy Engineering, University of Science and Technology of China Hefei 230026 PR China
College of Materials and Energy, South China Agricultural University Guangzhou 510000 PR China.
RSC Adv. 2020 Feb 27;10(14):8558-8567. doi: 10.1039/c9ra10675h. eCollection 2020 Feb 24.
To improve the utilization of lignin, much effort has been devoted to lignin depolymerization with the aim to decrease waste and enhance profitability. Here, a dual property (acid and base) catalyst, namely SO -KO/TiO, was carefully researched. Upon loading SO and KO onto TiO, acid and base sites emerged, and SO and KO mutually enhanced the acid and base strengths of the catalyst enormously; this indeed facilitated lignin depolymerization. Under appropriate conditions, the yields of liquid product, petroleum ether soluble (PE-soluble) product and total monomer products were 83.76%, 50.4% and 28.96%, respectively. The constituents of the PE-soluble fraction, which are mainly monomers and dimers, can be used as liquid fuels or additives. In addition, after the catalyst was modified by Ni, better results were obtained. Surprisingly, it was found that the Ni enhanced not only the hydrogenation capacity but also the acidity. The highest high heating value (HHV) of the liquid product (33.6 MJ kg) was obtained, and the yield of PE-soluble product increased from 50.4 to 56.4%. The product can be utilized as a fuel additive or be converted to bio-fuel. This catalysis system has significant potential in the conversion of lignin to bio-fuel.
为提高木质素的利用率，人们致力于木质素解聚，以减少废弃物并提高经济效益。在此，对一种具有双重性质（酸性和碱性）的催化剂，即SO₄²⁻/K₂O/TiO₂进行了深入研究。在TiO₂上负载SO₄²⁻和K₂O后，出现了酸性和碱性位点，且SO₄²⁻和K₂O极大地相互增强了催化剂的酸性和碱性强度；这确实促进了木质素的解聚。在合适的条件下，液体产物、石油醚可溶（PE-可溶）产物和总单体产物的产率分别为83.76%、50.4%和28.96%。PE-可溶部分的成分主要是单体和二聚体，可作为液体燃料或添加剂。此外，用Ni对催化剂进行改性后，得到了更好的结果。令人惊讶的是，发现Ni不仅增强了氢化能力，还增强了酸性。获得了液体产物的最高高热值（HHV）（33.6 MJ/kg），PE-可溶产物的产率从50.4%提高到了56.4%。该产物可作为燃料添加剂或转化为生物燃料。这种催化体系在将木质素转化为生物燃料方面具有巨大潜力。
