APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Jinxu Xi,Qineng Xia,Yi Shao,Daqian Ding,Panpan Yang,Xiaohui Liu,Guanzhong Lu,Yanqin Wang
Liquid bio-fuels derived from renewable biomass are of great importance on the potential substitution for the diminishing fossil fuels. Aqueous-phase process of sugar and sugar-derived molecules can be used to produce a range of alkanes and oxygenates. In this work, Pt/NbOPO 4 multifunctional catalyst was used in the alkane production by the hydrodeoxygenation of sorbitol in aqueous solution. The results indicated that Pt/NbOPO 4 catalyst showed the highest activity with 60% yield of C6 and C5 alkanes at 250 °C and 4 MPa H 2 among a series of catalysts. The reaction pathway showed that this process included dehydration, hydrogenolysis and CC bond cleavage. Isosorbide is the product of dehydration reaction and also an important intermediate in this process, which undergoes ring opening and following hydrogenolysis to form C6 hexane. The activation energy of sorbitol dehydration and isosorbide hydrogenolysis was calculated, that is 72.7 kJ/mol and 147.6 kJ/mol, respectively, over Pt/NbOPO 4 catalyst, much lower than those over Pt/ZrP and Pt/H-Beta catalysts, which would be attributed to the strong and high acid amount of NbOPO 4 as well as the promotion effect of NbO x for CO bond cleavage. The above results also showed that isosorbide hydrogenolysis is the rate-determine step. More importantly, Pt/NbOPO 4 catalyst was very stable, there was nearly no decrease of sorbitol conversion and no change of products distribution after working in a fixed bed reactor for 100 h. Therefore, Pt/NbOPO 4 is an efficient and stable catalyst for hexane production from sorbitol in aqueous media.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
In this paper, the Cu-Ce based catalyst using NbOPO 4 (Nb-P) as support was firstly employed for selective catalytic reduction (SCR) of NO by NH 3 . The experimental results had illustrated that such catalyst exhibited well SCR activity and N 2 selectivity within a wide temperature range of 200–450 °C. These superior performances could be mainly attributed to its improved textural properties and strong acidity derived from NbOPO 4 support. More importantly, the sulfur tolerance of the NbOPO 4 supported Cu-Ce sample was found greatly improved compared to TiO 2 and Ti-Nb supported samples, where above 80% SCR activity of Cu-Ce/Nb-P sample was obtained at 250 °C after 10 h reaction running in the presence of 100 ppm SO 2 . This fact was the result of the enhanced acidity and the strong interactions between Cu-Ce oxides and NbOPO 4 support, which could prevent the surface oxygen species from sulfation by SO 2 . As such, these oxygen species strongly associated with NbOPO 4 support still could activate adsorbed NH 3 to fulfill the SCR reaction cycle, leading to its better sulfur resistance. The work would provide some enlightenments to the development of NH 3 -SCR catalysts with high sulfur resistance at medium-high temperature.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Lei Wang,Xiaohui Liu,Yanqin Wang,Weizhen Sun,Ling Zhao
Isosorbide is a bio-based platform compound, and the solid acid-catalyzed conversion of sorbitol to isosorbide is an environment-friendly process. The thermodynamic calculations and reaction kinetics of the sorbitol dehydration to isosorbide catalyzed by NbOPO4 were studied in this work. The thermodynamic analysis shows that the two-step dehydration of sorbitol is an endothermic process, in which the first one is an irreversible reaction while the second is a reversible one. Based on the reaction mechanism and thermodynamics, a first-order pseudo-homogeneous kinetic model for the sorbitol dehydration was proposed. The modeling fitting results show that the kinetic model established in this work can well fit the experiments in the range of 493.15–523.15 K. The kinetic investigation and thermodynamic analysis indicate that low temperatures would decrease the generation of byproducts in the first step while high temperatures promote the reaction equilibrium forward in the second step. Therefore, a two-stage temperature gradient way with high temperatures followed by low temperatures would be favorable in the conversion of sorbitol to isosorbide catalyzed by NbOPO4. Hopefully, the thermodynamics and kinetic modeling results obtained in this work would guide the design of solid acid catalysts and reactors for the sorbitol dehydration process.
研究领域:
化学工程
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催化科学
·
生物基材料
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Danni Liu,Xiaopo Niu,Zhen Guo,Kaige Zhang,Nan Jiang,Yue Qin,Wenli Zhao,Xiangwen Zhang,Qingfa Wang
Upgrading lignocellulose biomass to renewable fuels is essential to achieve carbon neutrality. However, the multiple synthetic, and purification steps as well as the employment of solvents in the production of renewable fuel inhibit the overall yields and cause the waste of energy and resources. Herein, a new catalytic strategy for one-pot solvent-free sequential synthesis (OSS) of perhydrofluorene and dicyclohexylmethane was developed from lignin-derivatives. A two-dimensional layered nanosheet niobium phosphate (NbOPO 4 -IB) catalyst was fabricated to efficiently integrate the alkylation of phenol and benzyl alcohol and sequential hydrodeoxygenation with a cocatalyst of Ru/C. The high crystalline NbOPO 4 phase and the lamellar morphology contributes to the large specific surface area to expose more active sites, especially more Brønsted acid sites. The NbOPO 4 -IB catalyst with a suitable Brønsted/Lewis acid ratio of 1.49 favors the selectivity of fuel precursors benzyl phenol in the alkylation and also provides the appropriate acid strength to promote hydrodeoxygenation activity. NbOPO 4 -IB also shows good reusability. Excessive phenol plays a vital role in promoting the alkylation reaction by dissolving the intermediates, and then into cyclohexane to enhance the H 2 dissolution in the hydrodeoxygenation. A possible mechanism of OSS from lignin-derivatives into polycycloalkanes over the cocatalysts was proposed.
研究领域:
催化化学
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可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
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2024
·
IF 2.4
Zhang Ruixuan,Wang Qiushi,Chen Liang,Zhang Jun,Liu Zhaoping
Due to the intrinsic structural stability, materials with polyanionic framework have attracted worldwide attention to build-up aqueous metal-ion batteries for large-scale energy storage. Anion-dependent electrochemical behaviors of graphene-modified Na 3 V 2 (PO 4 ) 3 (rGO/NVP/C) with rhombohedral structure have been explored. Compared to common saturated solutions, remarkable improvements on overall the electrochemical performances have been achieved in novel deep eutectic solvents (DES) based on methylsulfonylmethane, perchloride salts and water. A high-voltage aqueous lithium-ion battery consisted of rGO/NVP/C nanomaterials as cathode materials and carbon-coated NbOPO 4 as anode materials (rGO/NVP/C||DES-Li||NbOPO 4 ) exhibits a specific energy of 74 Wh kg −1 with a voltage output up to 1.8 V and excellent capacity retention that is above 80.1% after 600 cycles at 2 C current density. Kinetic studies have clearly shown that Li + (de)intercalation in rGO/NVP/C in DES is dominated by a diffusion-controlled process. During the repetitive Li + (de)intercalation, a phase transformation from Na 3 V 2 (PO 4 ) 3 phase into Li 2 NaV 2 (PO 4 ) 3 is identified. The negligible changes of lattice volume within Na 3 V 2 (PO 4 ) 3 during Li + (de)intercalation, and the wide electrochemical window of DES together with the low activity of water in DES enable the long cycle life of rGO/NVP/C||DES-Li||NbOPO 4 . Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ruiping Wei,Mingzhu Yao,Ziqi Wang,Huijun Liu,Rongying Xia,Lei Yang,Guanghui Ma,Lijing Gao,Xiaomei Pan,Guomin Xiao
The properties of support have significant effects on the catalytic performance of supported catalysts. The present study involves the synthesis of a series of Mo-modified NbOPO4 supports, which were subsequently utilized for the preparation of supported NiCu bimetallic catalysts via a hydrothermal method. All catalysts were evaluated in the HDO of oleic acid to long-chain alkanes without carbon loss, an essential procedure for contemporary industrial applications. The effects of acidity and porosity on the dispersity and valence states of the metal components were systematically investigated via BET, XRD, SEM, XPS, NH3-TPD, and H2-TPR. Catalytic performance of the materials for HDO of oleic acid was assessed and it revealed that NiCu supported on Mo-modified NbOPO4 exhibited significantly enhanced selectivity for C18 compared to those supported on NbOPO4 (53.10% VS 84.16%) under the mild reaction condition of 250 °C reaction temperature, 3 MPa initial H2 pressure and 7 h reaction time. The resluts demonstrated the significant potential of Mo-modified NbOPO4 as a support for NiCu bimetallic catalysts, enabling efficient conversion of oleic acid into C18 and highlighted the crucial role of support modification in enhancing catalytic performance.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2014
·
IF 0
Jinxu Xi,Daqian Ding,Yi Shao,Xiaohui Liu,Guanzhong Lu,Yanqin Wang
The efficient usage of lignocellulosic biomass is of great significance for large-scale low-cost biomass conversion to biofuels and other useful chemicals. Here, an interesting catalytic process was reported related to converting cellulose into ethylene glycol (EG) and ethylene glycol monoether (EGME) in methanol over a Ru/NbOPO4 catalyst, with the cleavage of a C–C bond by NbOPO4 and further hydrogenation by supported Ru particles. The influence of reaction temperature, hydrogen pressure, and reaction time was systematically investigated and showed that a 54.5% total yield of EG and EGME could be obtained at 220 °C in 3 M Pa H2, which was an exciting result. Meanwhile, the effect of solvent was also studied in detail. It was shown that methanol played an important role in the production of EG and EGME, especially in the cleavage of the C–C bond. Methanol could protect the C═O bond in glucose produced from cellulose through acetalization, thus prevent its hydrogenation, and led to the production of EG and EGME. Furthermore, the influence of dopants (W, Sn, Ni, Cu) was further investigated, and it was found that only the Ru–Ni/NbOPO4 catalyst was more effective through limiting the further hydrogenolysis of products (EG and EGME) to CO and alkanes, and as high as 64% total yield of EG+EGME was achieved. Moreover, the Ru–Ni/NbOPO4 catalyst showed good reusability, which can be reused at least four times with a little loss in EG and EGME yield.
研究领域:
化学工程
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生物质能转化
✓ 已验证
产品关联
DOI
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Qianying Fang,Zhicheng Jiang,Kai Guo,Xudong Liu,Zheng Li,Guiying Li,Changwei Hu
Two-step conversion of pubescens to aromatic monomers and small molecular weight oligomers (mainly dimers and trimers) was studied. Lignin-derived oligomers (LDO) were obtained by formic acid assisted solvo-thermal conversion of pubescens in the H 2 O-ethanol system at 160 ℃. In the second step, hydrogenolysis of LDO on Pd/NbOPO 4 catalyst was carried out over the temperature range of 60–120 ℃. Pd/NbOPO 4 showed acceptable catalytic performance for efficient degradation of oligomers at low temperature. The NbO x species on the catalyst facilitated the breakage of C O C bonds to depolymerize the oligomers toward small molecules, while Pd species accelerated the selective hydrogenation of side chain and furans. The esterification of S (Syringol) unit phenols took place simultaneously with the depolymerization of LDO. The hydrogenated mixture at 100 ℃ and reaction time of 20 h had an average molecular weight of 908 g/mol, and the yield of aromatic monomers was 22.4 wt.% based on lignin contained.
研究领域:
化学工程
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可再生资源转化
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 3
·735-745
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IF 5.365
Lin Dong,Li-Li Yin,Qineng Xia,Xiaohui Liu,Xue-Qing Gong,Yanqin Wang
One-pot depolymerization of lignin to well-defined chemicals and their further deoxygenation to arenes are extremely attractive. Based on our previous results that Nb2O5 species can promote the cleavage of C–O bonds and the synergistic effect between Ru and Nb2O5 species led to the direct transformation of lignin into arenes over a Ru/Nb2O5 catalyst [Nat. Commun., 2017, 8, 161041], the importance and influence of ruthenium particle size need to be further studied. Herein, we report the different performances of Ru/NbOPO4 catalysts with various Ru particle sizes in the hydrogenolysis of a lignin model compound. This study shows that the catalytic activities and the product distributions strongly depend on the size of Ru nanoparticles (NPs): Ru NPs with smaller diameters (1.2 and 1.8 nm) have a higher activity for the cleavage of Caliphatic–O and Caromatic–O bonds, whereas Ru NPs with larger diameters (2.5 and 5.3 nm) show a much lower activity for C–O cleavage, especially for the Caromatic–O bond, resulting in totally different product distributions. Density functional theory (DFT) calculations revealed that the presence of step and edge sites in smaller Ru particles can significantly lower the barriers for both Caromatic–O and Caliphatic–O bond cleavage. This study provides a new way for catalyst design towards highly efficient and selective hydrogenolysis of lignin to useful aromatic chemicals.
研究领域:
催化化学
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材料科学
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可再生资源转化
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Junru Liu,Qiushi Wang,Liang Chen,Jun Zhang,Jiemiao Pan,Xiaomin Wang,Zhaoping Liu
The choice of anode materials for high-voltage aqueous batteries beyond 1.5 V is still far from satisfactory, due to the narrow electrochemical stability window of aqueous electrolytes . With the inherent advantages of low working voltage and fast ionic diffusion, niobium phosphates with polyanionic framework groups built of NbO 6 octahedra and PO 4 tetrahedra are very promising anode materials for high-voltage aqueous batteries. Herein, carbon-coated NbOPO 4 (NPO/C) materials with monoclinic structure has been prepared by the solid-state reaction & chemical vapor deposition method. Between -1.34 V and 0.6 V vs. standard hydrogen electrode, it could deliver a specific capacity of 116 mAh/g with a high coulombic efficiency of 92.0% at a low current rate of 0.33C in aqueous electrolytes based on methylsulfonylmethane, LiClO 4 and H 2 O (DES). The diffusion-controlled process dominates the electrochemical reaction of NPO/C. Upon the reversible insertion/extraction of lithium ion into/from NPO/C, it maintains the monoclinic structure with a small lattice expansion, which is a characteristic of zero-strain effect. Finally, the full cell based on NPO/C anode, LiMn 2 O 4 cathode and DES electrolytes with a high specific energy 101.6 Wh/kg and a high voltage output beyond 2 V has been validated. It also shows excellent cycling performance with the capacity retention of 94.3% after 1000 times at 2C rate, which suggests that monoclinic β-NbOPO 4 can be used as a promising electrode material for aqueous lithium-ion batteries with high voltage output for energy storage in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Jianxiu Hao,Yafang Zhang,Heya Na,Na Li,Yanpeng Ban,Huacong Zhou,Quansheng Liu
Chemical recycling of polycarbonate (PC) waste can effectively upgrade PC to valuable chemicals. This work developed a novel catalytic system composed of Ru-NbOPO 4 as the catalyst and decane as the solvent for the selective hydrodeoxygenation of PC waste to cycloalkanes, a potential additive for jet fuels. The depolymerization degree and product distribution under the condition of different catalysts and solvents were investigated. The results proved that the combination of Ru-NbOPO 4 and decane exhibited the >99 % depolymerization degree of PC and > 99 % selectivity to cycloalkanes under 240 °C. The acidic sites in the NbOPO 4 framework effectively enhanced the hydrodeoxygenation capacity of the catalyst. The catalytic system can achieve the total conversion of real PC wastes (discarded CDs and water buckets) into cycloalkanes with >99 % selectivity under 240 °C. The by-product CO 2 derived from the carbonyl linking units in PC can also be converted into CH 4 along with the formation of cycloalkanes in one-pot reaction, increasing the catalytic efficiency of the system and decreasing the emission of CO 2 . With the advantages of high selectivity to cycloalkanes and efficient for real waste PC, the developed catalytic system provides a new approach for the selective upgradation of PC waste to cycloalkane fuels.
研究领域:
催化化学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2026
·
IF 10.6
Danni Liu,Kaige Zhang,Wenli Zhao,Xiaopo Niu,Xiangwen Zhang,Qingfa Wang
To address the challenges of complex separation and high energy consumption in producing high-density biofuels from biomass, developing high-efficiency bifunctional catalyst to integrate carbon-carbon coupling and hydrodeoxygenation processes is highly desired. Herein, a bifunctional catalyst with RuOx anchored on the edge of NbOPO4 nanosheets was successfully fabricated through an impregnation-calcination method, enabling one-pot solvent-free conversion of lignin-derived phenol and benzyl alcohol into polycycloalkane perhydrofluorene. The NbOPO4 nanosheet edges were enriched in oxygen vacancies and were prone to anchoring RuOx species preferentially. The optimized 3%RuOx/NbOPO4 exhibited abundant Ru-O-Nb interfacial species, which synergized with Brønsted acid sites (BASs) to enhance the alkylation performance. The in-situ generated Ru0 species from the Ru-O-Nb interfacial species exhibited superior hydrogen dissociation capability, then the synergistic interaction with BASs through hydrogen spillover significantly boosted the hydrodeoxygenation efficiency. 3%RuOx/NbOPO4 with more Ru-O-Nb interfacial species exhibited high conversion of benzyl alcohol (98%) and yield towards perhydrofluorene (72%) under mild conditions (160 °C, 3 h) with a low environmental E-factor (≤2.8). Mechanistic studies identified the cyclization hydrogenation of oxygenated intermediates as the rate-determining step, and the product dicyclohexylmethane was mainly formed from the selective ring opening of perhydrofluorene over the synergy metal-acid sites of 3%RuOx/NbOPO4. This study provides a deep insight into designing efficient bifunctional catalysts for sustainable aviation fuel production through process integration.
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产品关联
DOI
高影响因子
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