A review on high catalytic efficiency of solid acid catalysts for lignin valorization

Guan, Weixiang; Tsang, Chi‐Wing; Lin, Carol Sze Ki; Len, Christophe; Hu, Haoquan; Liang, Changhai

doi:10.1016/j.biortech.2019.122432

Cited by 67 publications

(21 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This improvement can be explained by one of the possible mechanisms of the cellulose fractionation/transformation and can subsequently enhance the enzymatic hydrolysis. Firstly, zinc salts make the crystalline cellulose of CS and TP more swollen and easier to degrade by the action of the enzyme [28]; secondly, ZnCl 2 acts as a Lewis acid that can activate specific functional groups and cleave the C-O bond during the depolymerization process, especially the glycosidic connections within lignocellulosic structures [23]; finally, the Cl atom is a high electronegative element, hence, the Cl anion is an excellent hydrogen bond acceptor for lignin and a polarization reagent for C-O bonds, and it has been utilized in biomass dissolution transformation [28].…”

Section: Surface Morphologymentioning

confidence: 99%

Role of Combined Na2HPO4 and ZnCl2 in the Unprecedented Catalysis of the Sequential Pretreatment of Sustainable Agricultural and Agro-Industrial Wastes in Boosting Bioethanol Production

Elyamny

Hamdy

Ali

et al. 2022

IJMS

View full text Add to dashboard Cite

Improper lignocellulosic waste disposal causes severe environmental pollution and health damage. Corn Stover (CS), agricultural, and aseptic packaging, Tetra Pak (TP) cartons, agro-industrial, are two examples of sustainable wastes that are rich in carbohydrate materials and may be used to produce valuable by-products. In addition, attempts were made to enhance cellulose fractionation and improve enzymatic saccharification. In this regard, these two wastes were efficiently employed as substrates for bioethanol production. This research demonstrates the effect of disodium hydrogen phosphate (Na2HPO4) and zinc chloride (ZnCl2) (NZ) as a new catalyst on the development of the sequential pretreatment strategy in the noticeable enzymatic hydrolysis. Physico-chemical changes of the native and the pretreated sustainable wastes were evaluated by compositional analysis, scanning electron microscopy (SEM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). These investigations showed major structural changes after the optimized sequential pretreatment. This pretreatment not only influences the delignification process, but also affects the functionalization of cellulose chemical structure. NZ released a higher glucose concentration (328.8 and 996.8 mg/dl) than that of ZnCl2 (Z), which released 203.8 and 846.8 mg/dl from CS and TP, respectively. This work led to the production of about 500 mg/dl of ethanol, which is promising and a competitor to other studies. These findings contribute to increasing the versatility in the reuse of agricultural and agro-industrial wastes to promote interaction areas of pollution prevention, industrialization, and clean energy production, to attain the keys of sustainable development goals.

show abstract

Section: Surface Morphologymentioning

confidence: 99%

Role of Combined Na2HPO4 and ZnCl2 in the Unprecedented Catalysis of the Sequential Pretreatment of Sustainable Agricultural and Agro-Industrial Wastes in Boosting Bioethanol Production

Elyamny

Hamdy

Ali

et al. 2022

IJMS

View full text Add to dashboard Cite

show abstract

“…For the lignin fraction, the production of lignin oil using Brønsted acid catalysts was reported. [8] For the catalysis of hydration/dehydration reactions, either homogeneous Brønsted acids (such as HCl and H 2 SO 4 ) or solid acids (such as zeolites, metal oxides or metal phosphides) [9] can be used. Additionally, heteropolyacids (HPAs) show especially good results in the hydration/dehydration due of their tunable acidic and redox multi functionality.…”

Section: Introductionmentioning

confidence: 99%

Solidified and Immobilized Heteropolyacids for the Valorization of Lignocellulose

et al. 2022

View full text Add to dashboard Cite

Heteropolyacids have been identified as promising for catalyzing the reaction types, hydration and dehydration, which play an important role in the valorization of lignocellulose. Not only do they possess adaptable Brønsted acidity, but they also show a redox multi functionality. To increase the industrial applicability of this promising class of catalysts and to enable recycling, many different approaches for immobilization (such as multiphasic catalysis or grafting) and solidification (such as salt formation) have been pursued in recent years. This review summarizes these efforts and highlights the studied acidcatalyzed lignocellulose conversions, trends and current challenges.

show abstract

“…[7] For example, Guan et al reported the CTH of an α-O-4 model compound 4-(benzyloxy)phenol and lignin extracted from bioconverted rice straw over Pt/HNbWO 6 /CNTs catalyst using isopropanol as the solvent and in-situ hydrogen donor. [8] Light alcohols (methanol, ethanol, and isopropanol) are the most common solvents for CTH due to their ability to solvate/ disperse lignin degradation products and donate hydrogen atoms, [8,9] thereby conferring excellent CTH performance. Formic acid is also employed as an effective hydrogen donor, which can undergo in-situ thermal/catalytic decomposition to liberate molecular hydrogen [10,11] under acidic conditions and thereby promote hydrogenolysis/HDO reactions in lignin depolymerization; [12,13] it can also direct the non-catalytic formylation of lignin and subsequent cleavage of β-O-4 structural units.…”

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Transfer Hydrogenation of Lignin to Alkyl Guaiacols Over NiMo/Al‐MCM‐41

Guo

Chen

et al. 2022

ChemSusChem

View full text Add to dashboard Cite

Efficient deoxygenation of lignin-derived bio-oils is central to their adoption as precursors to sustainable liquid fuels in place of current fossil resources. In-situ catalytic transfer hydrogenation (CTH), using isopropanol and formic acid as solvent and in-situ hydrogen sources, was demonstrated over metaldoped and promoted MCM-41 for the depolymerization of oxygen-rich (35.85 wt%) lignin from Chinese fir sawdust (termed O-lignin). A NiMo/Al-MCM-41 catalyst conferred an optimal lignin-derived oil yield of 61.6 wt% with a comparatively low molecular weight (M w = 542 g mol À 1 , M n = 290 g mol À 1 ) and H/C ratio of 1.39. High selectivity to alkyl guaiacols was attributed to efficient in-situ hydrogen transfer from isopropanol/formic acid donors, and a synergy between surface acid sites in the Aldoped MCM-41 support and reducible Ni/Mo species, which improved the chemical stability and quality of the resulting lignin-derived bio-oils.

show abstract

A review on high catalytic efficiency of solid acid catalysts for lignin valorization

Cited by 67 publications

References 86 publications

Role of Combined Na2HPO4 and ZnCl2 in the Unprecedented Catalysis of the Sequential Pretreatment of Sustainable Agricultural and Agro-Industrial Wastes in Boosting Bioethanol Production

Role of Combined Na2HPO4 and ZnCl2 in the Unprecedented Catalysis of the Sequential Pretreatment of Sustainable Agricultural and Agro-Industrial Wastes in Boosting Bioethanol Production

Solidified and Immobilized Heteropolyacids for the Valorization of Lignocellulose

Selective Catalytic Transfer Hydrogenation of Lignin to Alkyl Guaiacols Over NiMo/Al‐MCM‐41

Contact Info

Product

Resources

About