INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Xue-Qi Wang,Zhe-Hui Zhang,Xiaohong Ren,Zeming Rong,Zhuohua Sun,Tong-Qi Yuan
Recent achievements in lignin depolymerization deliver various platform chemicals with high yields and provide great potential for further upgrading to value-added high-end products. 4-propylguaiacol as one of the most widely reported products via lignin-first depolymerization approach has been upgraded to a lot of valuable chemicals including polymer and pharma intermediates. In this work, we moved the focus to the field of flavors and fragrances, and proposed an environmental-friendly synthesis route to get the alternative of 4-tert-butylcyclohexyl acetate (an important fragrance ingredient with annual production of more than 1000 metric tonnes). The key for the methodology is the design and development of the Raney NiCu catalyst which prepared by ball milling and dealloying process. The obtained catalysts show improved activity compared to widely used Raney Ni catalyst and the highest yield of 87.8% for 4-propylcyclohexanol could be achieved at 160 °C when use 2-propanol as hydrogen donor. The second step aims to get 4-propylcyclohexyl acetate via esterification of 4-propylcyclohexanol with acetic acid. This could be proceeded at 90 °C via Amberlyst-15 catalyst with the highest yield of 88.3%. The proposed process presents the potential to produce the biobased flavors and fragrances in a sustainable way.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yunting Mao,Liyue Hou,Ligai Bai
In this work, a monolithic cartridge packed with lignin polymer (LiP)-dopped adsorbent was fabricated in a stainless steel tube via polymerization using divinyltetramethyldisilane as the monomer, which aimed for the extraction and separation of hyperin from Senecionis Scandentis Hebra (SSH). The fabricated monolithic cartridge used for the solid-phase extraction (SPE) method was characterized by scanning electron microscope, fourier transform infrared spectrometer, specific surface area measuring instrument and mercury intrusion porosimetry, which confirms a macro- and meso -porous structure with high specific surface area of 333.2 m 2 /g of the optimized adsorbent. An SPE-HPLC method was established by combining the prepared monolithic cartridge and a C18 analytical column via HPLC system for the online extraction, enrichment and quantitative determination of hyperin from SSH. The results indicate that the prepared monolithic cartridge shows not only specific selectivity for the target component of hyperin, but also outstanding removal ability for the sample matrix. Methodology validation was carried out to verify the proposed quantitative analytical method, including the regression equation and related data, the precision, the spiked recovery and the preparative repeatability of the SPE cartridge, which results confirm the feasibility of the present method for the extraction and quantitative determination of hyperin from SSH.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yu-Hui Jiang,Yu-Qing Zhang,Zhan-Hua Wang,Qing-Da An,Zuo-Yi Xiao,Ling-Ping Xiao,Shang-Ru Zhai
Superhydrophobic oil-water separation substrates with low cost, high quality and highly efficient performance are desirable in practical fields; however, utilizing the synergistic chemistry of intrinsic molecular characters of lignin (HTL) and dopamine (DA) was rarely reported, even both of which extensively studied for fabricating varied functional materials. Here, inspired by mussel chemistry, superhydrophobic melamine foam (MF) composites with stable micro-islands projections were constructed (HTL@MF-SC) by free radical addition of dopamine (DA) and hydrothermal extraction of β-O-4 bond-rich lignin (HTL) as a primer and installation of an auxiliary coating silicon coating (SC). In a certain area, MF formed porous network channels supplying space for oil absorption, while the slender MF fiber acted as a "temporary antenna" to adsorb the wee oil droplets in oily wastewater, ensuring efficient oil/water separation for oil/water mixture (98% after 10 cycles) and achieving strong adsorption capacity (57.48–147.33 g/g). Several technology-model-supported experiments presented that the HTL@MF-SC-based superhydrophobic material with micro-island projections maintained greatly mechanical stability and apparent contact angle considerable to withstand 10 friction and tape stripping cycles. Even being treated by different pH environments, as-designed superhydrophobic surface still maintained a water contact angle beyond 150°, favorably confirming its acid and alkali resistance under testing conditions.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Ming Jiang,Xiaopeng Chen,Linlin Wang,Jiezhen Liang,Xiaojie Wei,Weijian Nong
Lignin is the most abundant renewable aromatic resource in nature; thus, the development of an efficient and economical catalysts that can depolymerize lignin into value-added aromatic monomers is highly desirable. Here, we report a single-atom Ni catalyst ( x Ni/CeO 2 -S, where x represents the Ni loading), in which the single-atom Ni sites are anchored to the oxygen vacancies on CeO 2 nanospheres, for the conversion of cellulolytic enzyme lignin (CEL) via depolymerization and hydrodeoxygenation. The 1.0Ni/CeO 2 -S catalyst performed the best, achieving a lignin oil (LO) and maximum monomer yield of 84.3 wt% and 32.6 wt%, respectively; a higher heat value of 31.64 MJ/Kg is achieved for LO compared to 23.03 MJ/Kg for CEL. Thus, single-atom nickel catalyst exhibited excellent activity and stability in promoting the depolymerization of lignin. These results validate the viability of single-atom metal catalysts for the conversion of lignin resources.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiaoxiao Wei,Yuanyuan Yu,Zheng Shen,Yi Liu,Xi Liu,Shuangfei Wang,Liming Zhang,Douyong Min
To reveal the existence of p -hydroxyphenyl (H) units in compressed wood lignin, four different milled wood lignins were extracted using Pinus massoniana Lamb compressed wood, Pinus massoniana Lamb normal wood, and sugarcane bagasse as raw materials. Then, three dehydrogenation polymers (DHPs) were synthesized using coniferyl/ p -coumaryl alcohol as raw materials to reveal the interunit linkages of H units. The lignin and DHP samples were systematically characterized by 1 H, 13 C, 2D HSQC, and 31 P NMR techniques. Compared with the opposite wood milled wood lignin (OW-MWL) and the normal wood milled wood lignin (NW-MWL), the compressed wood milled wood lignin (CW-MWL) contained a large amount of H units, and the H/G ratio and the p -hydroxyphenyl OH group contents were 0.15 and 1.09 mmol/g, respectively. Through the characterization of CW-MWL and DHPs, it was revealed that p -hydroxyphenyl units mainly coupled with other units by β-O-4, β-β, and β-5 linkages. Compared to the sugarcane bagasse milled wood lignin, it was clearly demonstrated that the H unit rather than p -coumarate ester occurred in CW-MWL. This study comprehensively explored the structural characteristics and linkages of H units in compress wood lignin, and provided useful information for revealing the participation of H units in the construction of lignin macromolecules .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Chao Liu,Fei Lin,Xiangchen Kong,Yuyang Fan,Weicong Xu,Ming Lei,Rui Xiao
Lignin-first biorefinery of corn stalk via ZrCl 4 /NaOH-catalyzed aerobic oxidation for phenolic carbonyls production was reported. Under the co-catalysis of ZrCl 4 and NaOH, lignin in corn stalk was oxidized into phenolic aldehydes ( p -hydroxybenzaldehyde, vanillin, and syringaldehyde), ketones ( p -hydroxyacetophenone, acetovanillone, and acetosyringone), acids ( p -hydroxybenzoic acid and vanillic acid), and other derivatives. Reaction conditions, including time, temperature, ZrCl 4 dosage, NaOH dosage, MeCN/H 2 O ratio, and initial O 2 pressure were comprehensively screened, and the optimal lignin-derived monomer yields of 13.2 wt% was obtained. Among these aromatic compounds, phenolic aldehydes were the main products, and the overall selectivity of phenolic carbonyls was as high as 93%. Cellulose-rich residues after lignin-first oxidation were further characterized by thermogravimetry and analytical pyrolysis with corn stalk as the control, proving the good fragmentation and dissolution of lignin streams. In general, ZrCl 4 /NaOH-catalyzed lignin-first oxidation provided a novel approach for lignin valorization, and achieved the highest reported phenolic carbonyls selectivity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Weitao Wang,Xiaomei Cao,Haishun Guo,Xiufang Yang,Nianwen Guo,Yangmin Ma
The carbon-based solid acid catalyst was prepared by carbonizing lignin and polyvinyl chloride at high temperature and then sulfonating with p-aminobenzenesulfonic acid. The catalyst was characterized by FI-IR, XPS, SEM, N 2 adsorption-desorption, and acid-base titration to reveal the physical and chemical properties of the catalyst. In addition, the effects of reaction temperature, time, catalyst loading, and solvent type on transformation of xylose to furfural were also investigated. The yield of furfural can reach 84.3% from xylose in GVL solvent. In addition, five common crop wastes of corn cob, corn stalk, rice straw, rice husk, and wheat straw are employed as the substrates over the as-prepared solid acid to investigate the catalytic performance. Satisfied yield of furfural from corn cob and rice husk are achieved. The results show that the prepared solid acid has good catalytic performance for the reaction of furfural production from biomass.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xinyu Lu,Xiaoli Gu
In this study, lignin-based epoxy resins (EP) were fabricated using lignin, phenol and glyoxal as crosslinking reagents. For improving the flame retardancy, a bi-DOPO compound with bi-hydroxyl structure was successfully synthesized, containing excellent quenching and charring capacities. Good pyrolysis behaviors of as-synthesized flame retardant resulted in significant quenching effect via structure decomposition to release PO and PO 2 free radicals for capturing reactive H and OH radicals produced from epoxy combustion. With addition of 0.18 wt% phosphorus, epoxy composite (10% LPG-ER-4) passed V-0 rating with high limited oxygen index (LOI) value of 35.2%. Cone calorimeter tests showed that heat release (including heat release rate (HRR) and total heat release (THR)) from combustion was reduced with assistance of flame retardant. Char residue analyses illustrated that bi-hydroxyl structure in DOPO-based flame retardant benefited the formation of char layer with higher compactness and integrity to serve as a protective shell of interior epoxy matrix. Furthermore, exterior pore size of char residue was narrowed or blocked to avoid the release of heat and volatiles generated from combustion. This study provided a feasible method to improve flame retardancy of lignin-based EP and proposed flame-retardant mechanism both in gaseous and solid phases.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Zhansi Dou,Yang Zhang,Zhongyang Li,Zhiqiang Fang,Hao Li,Jing Fang
Lignin is a high-quality precursor of carbon materials, rich in content and low in price. Sodium lignosulfonate was used as a raw material to prepare a high-efficiency catalyst for the esterification of adipic acid and methanol to synthesize dimethyl adipate by a one-step carbonization sulfonation process. The catalyst synthesized by this method has high sulfonic acid groups, and the catalytic process does not need to use sulfuric acid and other advantages. Through characterization analysis, study the relationship between the structure of the catalyst and the catalytic performance. A preliminary study on the industrial application of the catalyst has been done. The optimal reaction conditions were reached when the catalyst dosage is 20% of the mass of adipic acid , the alkyd ratio is 8:1, the stirring speed is 600r/min, the reaction temperature is 346 K, and the reaction time is 120 min
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Shuai Wang,Thomas L. Eberhardt,Hui Pan
A lignin-derived mesoporous carbon solid acid catalyst (LDMCC) was prepared using alkali lignin as a carbon source and KCl as a salt template to generate a carbon support that was carboxylated with acrylic acid. The prepared LDMCCs were characterized by various spectroscopies (FTIR, XPS, XRD, Raman), porosity determinations (BET), microscopies (SEM, TEM), thermogravimetric analysis, and acid-base titration. The LDMCC produced at the highest carbonization temperature (900 °C) possesses a rich porous structure, high specific surface area (1197.1 m 2 ·g −1 ), large pore volume (0.63 cm 3 ·g −1 ), and abundant –COOH groups (2.4 mmol·g −1 ). This weakly acidic catalyst exhibits excellent synergistic catalytic performance with DMSO in the catalytic dehydration of fructose to prepare 5-hydroxymethylfurfural (5-HMF); the yield of 5-HMF was 96.0% using dimethyl sulfoxide as the solvent, reaction conditions of 180 °C for 2.0 h, and a catalyst loading of 0.1 mg·mg −1 . In addition, the prepared LDMCC exhibits excellent reusability over five cycles of use without significant loss in its catalytic activity. This study provides a novel green route for the preparation of a weakly acidic catalyst which may be useful for a variety of biomass conversion processes.
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Hanjun Zhou,Xianzhen Li,Haoting Jin,Diao She
A high-performance nitrogen-doped lignin-based carbon material (ILAC-N) was synthesized using industrial lignin and urea by hydrothermal and activation, as an absorbent of tetracycline hydrochloride (TC). The results showed that the ILAC-N comprises a double-channeled structure with micro and mesopores. It exhibits an excellent adsorption capacity of TC across a wide pH range (pH 2–11), with the highest adsorption capacity of 1396 mg g −1 at 323 K. Tests in actual wastewater showed that the TC removal rate by ILAC-N exceeded 97.4%. Moreover, it maintained a removal rate of 84% after 10 regeneration cycles, revealing its high reusability. Mechanisms suggested that pore filling and π–π interaction played a critical role in this process. In conclusion, ILAC-N can be broadly applied to livestock manure and pharmaceutical wastewater treatment, owing to its high adsorption capacity, good adsorption properties across a wide pH range, excellent reusability. Furthermore, this research opens a new path for lignin utilization.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jian Wang,Zibiao Liu,Jian Li,Beibei Yan,Junyu Tao,Zhanjun Cheng,Guanyi Chen
In this study, various water splitting metals (Mg, Al, Zn, and Fe) were investigated for lignin HDO-HTL. Their behaviors during autocatalyzed hydrogenation and interactions with Al–Ni alloy catalyst during non-autocatalyzed hydrogenation were studied. The relationships between Mg, Zn, and Fe with Al–Ni catalyst were synergistic in HTL for bio-oils generation, leading to higher bio-oil yields in non-autocatalytic process than in autocatalytic process and Al–Ni catalytic HDO process. In contrast, because the effect of γ-AlO(OH) was strengthened when Al was used, the coking phenomenon was induced, leading to an antagonistic effect towards bio-oil production. Additionally, although the production of hydrogen was the lowest when Fe was applied, the bio-oil yields reached the highest (44.53 wt% in non-autocatalytic process and 49.83 wt% in autocatalytic process, respectively) with the deoxygenation degrees of 8.41% in non-autocatalytic process and 9.75% in autocatalytic process. Accordingly, Fe exhibited significant potential in lignin in-situ HDO-HTL.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）