INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Yuen Wai Lui,Qingqing Tao,Geoffrey R. Akien,Alexander K.L. Yuen,Alejandro Montoya,Bun Chan,Matthew Y. Lui
Hydrothermal depolymerization techniques such as hydrothermal liquefaction (HTL) are promising methods for converting biomass into fuel and valuable chemicals. While the HTL of lignin has been extensively studied, its fundamental chemistry remains underexplored, particularly regarding the reactivity differences among various major technical lignins under HTL conditions. A deeper understanding of these variations is essential for optimizing HTL processes. In this report, four major types of technical lignins—dioxane lignin, Kraft lignin, ethanosolv lignin, and soda lignin—extracted from the same pine sawdust were thoroughly characterized and subjected to neutral or base-catalyzed HTL at 330 °C for 1 h. The bio-oils derived from these lignins were analyzed for their physical and chemical properties. The data indicate that, while the structural differences between the lignins influenced the HTL outcomes, their impact was significantly smaller compared to the effect of the presence of a catalyst. To better understand the relationship between lignin structure and the resulting monomeric products, model compounds representing key structural motifs in technical lignins (namely β-O-4, styryl ether, and phenyl glycerol) were synthesized and tested under HTL conditions to simulate the lignin depolymerization process. Additionally, computational methods were employed to elucidate its reaction pathways.
研究领域:
能源植物学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
·
IF 6.2
Chenhao Li,Yi Niu,Linlin Yi,Yaoqiang Li,Jia Fu,Fang Tang,Kaiyuan Li,Yanyan Zou
This paper explores the application of zeolitic imidazolate framework-8 (ZIF-8) in pyrolytic disposal of poly(vinyl chloride) (PVC), with the goal of assessing the in situ catalytic removal and capture effect of ZIF-8 on Cl, elucidating the migration pattern of Cl, revealing the mechanism of in situ Cl capture by ZIF-8. The results demonstrate that excellent catalytic and Cl trapping properties are exhibited by ZIF-8, and an additional 311.1 mg/g of organic Cl from PVC is facilitated to be removed at 250 ºC. The catalytic effect enhances Cl trapping at low temperatures. The solid-solid reaction between PVC and ZIF-8 during in situ pyrolysis significantly improves Cl capture compared to ex situ pyrolysis. During in situ pyrolysis, ZIF-8 shows excellent Cl capture between 250 and 350 ºC, where Cl is primarily captured in the solid phase as inorganic Cl. ZIF-8 achieves optimal Cl capture at 300 ºC, reaching a peak HCl removal rate of 89.5 %. At this temperature, the content of solid-phase inorganic Cl reaches a maximum of 442.0 mg/g, accounting for 78.7 wt% of the total Cl content. The key to Cl capture lies in the chemical adsorption sites of Zn²⁺ and organic ligands in the ZIF-8 structure, which can react with Cl in both solid-solid and gas-solid reactions. Additionally, crystals formed during pyrolysis create an adsorption barrier, ultimately enabling efficient Cl capture.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 5
·2192-2200
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IF 5.503
Zhewen Ma,Qiuyu Zhang,Wen Zhu,Darvaish Khan,Chuanzhu Hu,Tianping Huang,Wenjiang Ding,Jianxin Zou
TMA-TM (TM = Fe, Ni) MOFs were synthesized successfully by a facile method. A MgH2-TM MOF (TM = Fe, Ni) composite was obtained via ball milling and the corresponding hydrogen storage performance was investigated. Particularly, high-resolution transmission electron microscopy was performed to in situ characterize the dehydrogenation behavior of the MgH2-TM MOF composite. The results reveal that nano α-Fe and Mg2NiH4/Mg2Ni derived from the TMA-TM MOFs display a synergetic improving effect on the de/hydrogenation of MgH2. During the hydrogen desorption process, Mg2NiH4/Mg2Ni works as a “hydrogen pump” to quickly deliver hydrogen and facilitates hydrogen diffusion. Meanwhile, α-Fe accelerates the nucleation and growth of Mg by reducing the nucleation energy of Mg from MgH2. The hydriding activation energy of the MgH2-TM MOF declines to 45.3 kJ mol−1 H2. Meanwhile, the peak dehydriding temperature of the MgH2-TM MOF is 530.9 K, which is much lower compared with the MgH2–Fe MOF composite (541.7 K) and as-milled MgH2 (685.2 K). Therefore, nano Mg2Ni and α-Fe derived from the TMA-TM MOFs can remarkably improve the hydrogen storage properties of the MgH2/Mg system due to their synergetic catalytic effects.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Lihong Ding,Xiuliang Sun,Chongpin Huang,Jianwei Li,Biaohua Chen
Cumyl hydroperoxide (CHP) is an important intermediate in phenol/acetone production; however, its long reaction time and low yield remain industrial challenges. In this study, an active and promising catalyst combination—NHPI + BmimBr ionic liquid (IL)—was developed for cumene oxidation under solvent-, transition-metal-salt-, and CHP-initiator-free conditions, which exhibited a synergistic catalytic effect and excellent catalytic performance. The cumene oxidation rate was accelerated by 33.3 %, leading to the rapid synthesis of a significant amount of the target product, CHP. DFT calculations demonstrated that NHPI undergoes hydrogen atom abstraction reaction through its interaction with BmimBr, forming PINO and carbene-Br radicals that can extract hydrogen. Additionally, EPR analysis demonstrated that both radicals are involved in the reaction. The nature of the synergistic effect was confirmed using theoretical and experimental approaches. The proposed catalyst eliminates the requirement of an initiator for IL and NHPI application, paving the way for the efficient production of CHP without solvents or initiators.
研究领域:
化学工程
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Canadian Journal of Chemistry
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2021
·Vol. 99
·期 10
·
IF 1.118
Xiaoxia Li,Shuaida Zhu,Qi Jia,Haixia Zhao,Yuqi Cao,Yuying Ma,Shuangqi Hu,Xiong Cao
In this work, it is shown that MoO3-x has a positive effect on the thermal decomposition of ammonium perchlorate based molecular perovskite (H2DABCO)[NH4(ClO4)3] (DAP-4). MoO3-x was prepared by heat treatment, and the morphology, structure, and thermal decomposition performance were characterized. The morphology and structure characterization results showed that MoO3-x was an irregular layered structure material and the Mo element was mainly in the +6 chemical valence state, with a small amount of Mo5+. Thermal analysis results showed that the thermal decomposition peak temperature of DAP-4 was effectively reduced from 394.4 °C to 353.7 °C, 321.4 °C, and 312.5 °C in the presence of 1%, 5%, and 10% MoO3-x, respectively. It is particularly worth noting that the maximum heat release rate of the DAP-4/10% MoO3-x mixture was increased by 4.9 times compared with pure DAP-4. Through the two classic thermal decomposition kinetic methods, Kissinger and Starink, the reliable kinetic parameters of DAP-4/MoO3-x were obtained. The increase of the reaction rate constant k indicated that the maximum thermal decomposition reaction rate of DAP-4 was effectively improved. This work provided a feasible technology for using MoO3-x as an effective catalyst to improve the thermal performance of DAP-4.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2024
·
IF 2.8
Dongping Huang,Shuifa Shen
Monoclinic BiVO 4 material was successfully synthesized through a hydrothermal method, and silver (Ag) nanoparticles were deposited onto the surface of BiVO 4 using the photo deposition technique. The gas-sensing outcomes demonstrate that the BiVO 4 material loaded with 2 wt% Ag has a good gas-sensing response to isopropanol, which is about three times that of pure BiVO 4 . In addition, it exhibits a fast response within 10 s and well-stability. The improved gas sensing properties primarily come from the catalytic and spillover effect mechanism of Ag.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Long Liang,Chunli Wang,Mingan Ren,Shouliang Li,Zhijian Wu,Limin Wang,Fei Liang
The pivotal steps for the practical application of dehydrogenation of aluminum hydride (AlH3) have been to decrease the temperature and increase the content of AlH3. Herein, the initial dehydrogenation temperature of AlH3 decreased to 43 °C with the amount of released hydrogen of 8.3 wt % via introducing TiO2 and Pr6O11 with synergistic catalysis effects, and its apparent activation energy of the dehydrogenation reaction decreased to 56.1 kJ mol–1, which is 52% lower than that of pure AlH3. These differences in performances of the samples are further evaluated by determining the electron density of Al–H bonds during dehydrogenation. The multiple valence state conversions of TiO2 and Pr6O11 promoted the electron transfer of H in AlH3, and a novel dehydrogenation pathway of PrH2.37 formed simultaneously, which could accelerate the breakage of Al–H bonds. The density functional theory calculations further exhibit that there are fewer electrons around H in AlH3 and the Al–H bond energy is weaker at the atomic levels, which is more conducive to the release of hydrogen. A higher hydrogen storage capacity and a lower dehydrogenation temperature make AlH3 one of the most promising hydrogen source media for mobile applications.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
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2014
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IF 0
Lu Liu,Hui Ren,Qing Jie Jiao
Due to high reaction activity and high combustion heat release, magnesium is widely used in the field of explosives. The research focus of this article is the effect of magnesium powder size and content on the thermal decomposition of PTFE. Two different particle sizes of magnesium powder are regarded as research objects. The thermal behavior of Mg/PTFE energetic system was investigated by TG-DSC analyzer. The experimental results show that magnesium has a catalytic effect on the thermal decomposition of PTFE. With the increase of magnesium content , the decomposition peak temperature of PTFE decreased firstly and when passed the ratio 50% increased, the best mixing ratio is Mg: PTFE =50:50. Within nanopowder, the activation energy of PTFE decreased by 150kJ∙mol-1 compared to 112 kJ∙mol-1 by mixing with micro powder. Obviously nanopowder has a better reactivity than micro powder, so has a more obvious catalytic effect.
研究领域:
材料科学
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热力学
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
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IF 4.084
Xu Huang,Xuezhang Xiao,Xuancheng Wang,Zhendong Yao,Jiahuan He,Xiulin Fan,Lixin Chen
Li–Mg–B–H reactive hydride composite (RHC) has attracted extensive attention over the past decades for its extremely high hydrogen storage capacity (11.5 wt%). But the sluggish desorption kinetics for the second step dehydrogenation reaction need to be further improved. Herein, short rod-like TMTiO 3 (TM = Co, Ni) bimetallic oxides , which contain two kinds of transition metal elements, were synthesized and introduced into Li–Mg–B–H RHC for the first time. The NiTiO 3 exhibits excellent catalytic effect on the hydrogen desorption kinetic performance of Li–Mg–B–H RHC, and the incubation period for the second step dehydrogenation reaction is eliminated completely by reducing the apparent activation energy for the generation of MgB 2 from 296 kJ/mol to 269 kJ/mol. The NiTiO 3 doped Li–Mg–B–H RHC can desorb about 9.0 wt% H 2 without obvious attenuation of kinetic performance in five cycles. Mechanism analyses reveal that the in-situ generated nano-sized MgNi 3 B 2 and TiB 2 species (∼5 nm) both meet the critical value ( < 10%) of the edge-to-edge matching model (5.77% for MgNi 3 B 2 and 2.22% for TiB 2 ), which play a significant role in supporting the nucleation of MgB 2 . Meanwhile, the extremely fine MgNi 3 B 2 and TiB 2 heterogeneous nucleation sites can inhibit the excessive growth for a single crystal nucleus of MgB 2 . The heterogeneous nucleation and grain refinement mechanisms caused by the novel bimetallic oxide could provide alternative insights into designing an in-situ generated nano-sized catalytic hydrogen storage system with enhanced kinetics and cyclic stability for hydrogen-fueled applications.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 7
·2441-2450
·
IF 8.897
Peng Lingxin,Tian Han,Cui Xiangzhi,Su Liang,Meng Ge,Ma Zhonghua,Cao Shaowen,Shi Jianlin
Developing anode catalysts of substantially enhanced activity for hydrogen oxidation reaction (HOR) and anti-CO poisoning performance is of great importance for the application of proton exchange membrane fuel cells (PEMFCs). Herein, we report Pd cluster in situ decorated urchin-like W 18 O 49 (WO 2.72 ) electrocatalysts by a photo-reduction method for high performance HOR. The synthesized Pd-WO 2.72 -L composite of low loading amount of 0.44 wt.% Pd by Xenon light reduction exhibits markedly high HOR catalytic activity and stability in 0.5 M H 2 SO 4 , and the specific HOR current density and mass activity of Pd-WO 2.72 -L are ∼ 1.5 and ∼ 80 times those of 20 wt.% Pt/C catalyst, respectively. Moreover, excellent anti-CO poisoning ability has also been obtained. The excellent HOR activity and anti-CO poisoning performance of Pd-WO 2.72 -L have been discussed mainly in terms of the dual synergetic catalytic effects between Pd and WO 2.72 : Pd activation to Pd δ+ by the electron transfer from Pd to W promotes the hydrogen adsorption and activation to H* species, which results in largely elevated HOR activity; Pd degradation due to the CO poisoning is effectively prevented by WO 2.72 , which is responsible for the excellent CO-tolerance performance.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Runbo Xue,Min Li,Jin Pan,Dingling Yuan,Yan Yang,Xiaofeng Hao,Xiangchao Pang,Fan Zeng,Yuan Zhu
Although manganese-based driers with nitrogen- or oxygen-containing ligands can accelerate the surface drying of tung oil film, their mechanical property performance does not meet industrial requirements. To address this, the drying activities of manganese-based driers with nitrogen- and oxygen-containing ligands on tung oil film were investigated. The curing process of tung oil film catalyzed by the combination driers of Mn(OH) 2 (benz) 2 ·Mn(H 2 O) 2 (acac) 2 , MnCl 2 (bipy) 2 ·Mn(H 2 O) 2 (acac) 2 , and MnCl 2 (bipy) 2 ·Mn(OH) 2 (benz) 2 was revealed using Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The results revealed that the combination driers enhanced the drying activities of Mn 2+ in tung oil due to a synergistic effect between Mn 2+ and its ligands. This process catalyzed the crosslinking of tung oil, giving the tung oil film a faster drying time, greater scratch resistance, increased hardness, improved flexibility, and greater thermal stability. These materials may replace traditional heavy metal driers to produce tung oil films with outstanding mechanical properties. Additionally, this paper describes the drying mechanism of these manganese-based driers with a combination of nitrogen-containing and oxygen-containing ligands and provides a new tung oil drying method.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 10
·853
·
IF 4.4
Xiaohan Wang,Han Tian,Libo Zhu,Shujing Li,Xiangzhi Cui
The application of electrochemical hydrogen evolution reaction (HER) for renewable energy conversion contributes to the ultimate goal of a zero-carbon emission society. Metal phosphides have been considered as promising HER catalysts in the alkaline environment, which, unfortunately, is still limited owing to the weak adsorption of H* and easy dissolution during operation. Herein, a bimetallic NiCoP-2/NF phosphide is constructed on nickel foam (NF), requiring rather low overpotentials of 150 mV and 169 mV to meet the current densities of 500 and 1000 mA cm−2, respectively, and able to operate stably for 100 h without detectable activity decay. The excellent HER performance is obtained thanks to the synergetic catalytic effect between Ni and Co, among which Ni is introduced to enhance the intrinsic activity and Co increases the electrochemically active area. Meanwhile, the protection of the externally generated amorphous phosphorus oxide layer improves the stability of NiCoP/NF. An electrolyser using NiCoP-2/NF as both cathode and anode catalysts in an alkaline solution can produce hydrogen with low electric consumption (overpotential of 270 mV at 500 mA cm−2).
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）