CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Lulu Sun,Shiyang Liu,Taifeng Liu,Dongqiang Lei,Nengchao Luo,Feng Wang
ABSTRACT Photocatalytic decomposition of sugars is a promising way of providing H 2 , CO, and HCOOH as sustainable energy vectors. However, the production of C 1 chemicals requires the cleavage of robust C−C bonds in sugars with concurrent production of H 2 , which remains challenging. Here, the photocatalytic activity for glucose decomposition to HCOOH, CO (C 1 chemicals), and H 2 on Cu/TiO 2 was enhanced by nitrogen doping. Owing to nitrogen doping, atomically dispersed and stable Cu sites resistant to light irradiation are formed on Cu/TiO 2 . The electronic interaction between Cu and nitrogen ions originates valence band structure and defect levels composed of N 2 p orbit, distinct from undoped Cu/TiO 2 . Therefore, the lifetime of charge carriers is prolonged, resulting in the production of C 1 chemicals and H 2 with productivities 1.7 and 2.1 folds that of Cu/TiO 2 . This work provides a strategy to design coordinatively stable Cu ions for photocatalytic biomass conversion.
研究领域:
化学工程
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材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2019
·
IF 5.439
Jiao Sun,Xin-an Xie,Di Fan,Xin Wang,Weiting Liao
Cellulose liquefaction in supercritical ethanol with 2,2,6,6-Tetramethylpiperidinooxy (TEMPO) was carried out in a stainless autoclave. The influence of process parameters on bio-oil (BO) and platform chemicals, mainly including the dosage of TEMPO, reaction temperature and reaction time, were investigated. Characterization of liquefaction products was explored by fourier transform infrared (FTIR) and gas chromatography-mass spectrometry analysis (GC-MS). The maximum yield of BO (57.98%) was obtained from cellulose liquefaction at 320 °C, 4 g TEMPO and moderate time of 60 min. It showed that the conversion rate and yield of BO was significantly improved by 46.14% and 31.87% due to temperature and TEMPO respectively. The relative contents of dominant platform chemicals in bio-oil were as follows approximately: ketones > esters > alkanes > alcohols > acids. The total yields of ketones enhanced markedly (from 20.00 to 41.83%) with the increasing of TEMPO. The results showed that TEMPO catalyst under appropriate reaction conditions improved the selectivity of platform chemicals with carbonyl, which had an obvious contribution on the converting of ketones.
研究领域:
化学工程
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可再生资源
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能源科学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Zhaojie Qin,Dongmei Bi,Bozheng Li,Xiang Zhu,Yu Ni,Lihong Wang
Furfural (FF) is a platform chemical with high value and wide application. The catalysts (Zinc oxide modified magnesium-aluminum spinel catalyst (Zn/MgAl 2 O 4 )) prepared in this paper allowed for the fast and efficient preparation of FF. Catalytic pyrolysis experiments were carried out on three typical biomass, and it was found that Zn/MgAl 2 O 4 had a significant enrichment effect on the production of FF in bio-oil. And the effect was more pronounced in the camphor wood experiments. Under pyrolysis conditions (400 °C, catalyst to biomass mass ratio is 1:1), FF relative content reached 64.31 wt%. Zn 2+ increased the acidic sites in Zn/MgAl 2 O 4 and accelerates proton transfer. Glycosidic bond cleavage and monomer degradation were significantly enhanced, resulting in improved FF conversion efficiency. The relative content of FF in the bio-oils obtained from pyrolysis of the three biomass feedstock in the temperature range of 400–600 °C was more than 50 wt%, and the results were better at low temperatures. The results of this paper can provide a theoretical basis for the preparation of FF from clean energy biomass.
研究领域:
能源生物学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Feng Lin,Yulong Ma,Yonggang Sun,Xiuqin Men,Yingbo Zhu,Tingting Gao,Kanghe Zhao
Strategies for catalytic lignin depolymerization to yield ethylbenzene chemicals are green, sustainable and environmentally friendly methods. In this study, a series of Ni-CeO 2 /H-ZSM-5 catalysts were prepared via the precipitation method, which catalytically degraded the β-O-4 chemical bonding structure to yield ethylbenzene chemicals. The 2-(2-methoxy-phenoxy)-1-phenylethanol substance (β-O-4) was selected as a typical lignin model compound for the investigation of the intrinsic depolymerization mechanism and the catalytic performance. The results demonstrated that the introduced CeO 2 active phase can effectively promote the catalytic conversion of the β-O-4 chemical bonding structure to ethylbenzene chemicals. Physicochemical data demonstrate that the reaction pathways and hydrogenation selectivity were effectively regulated and controlled by the tuning of the dehydration and hydrogenolysis processes via the introduction of CeO 2 , which realized the selective adjustment of the redox properties and the surface valence states of active species in the catalytic process due to its excellent oxygen transfer performance.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Ting Lu,Yucui Hou,Weize Wu,Muge Niu,Shuhang Ren,Zengqi Lin,Vijay K. Ramani
The transformation of biomass into platform chemicals is a key intermediate step to establish biomass-based sustainable chemical processes. The preparation of oxygenated chemicals by conversion of biomass is of significant conceptual and practical interest. In this work, an efficient catalytic system for carbohydrate-based biomass oxidation to oxygenated chemicals (including formic acid, dimethoxymethane and methyl formate) with O 2 using H 5 PV 2 Mo 10 O 40 as catalyst is presented. Conversions of glucose and cellulose in a methanol/water medium achieved total product yields of oxygenated chemicals up to 92.9% and 89.7%, respectively (based on carbon). A conversion pathway to clarify the mechanism of product formation was proposed. Protecting reactive functional groups of sugars and reaction intermediates via acetalisation and etherification in methanol effectively suppressed CO 2 formation and remarkably enhanced the production of oxygenated chemicals. The effect of solvent composition on catalyst H 5 PV 2 Mo 10 O 40 was investigated, and it was found that the structural stability of the catalyst increased by the addition of methanol. The catalyst was reused four times without significant decline in activity.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 3
·586
·
IF 3.426
Changbo Zhao,Caijuan Huang,Qin Chen,Ian D. V. Ingram,Xiankui Zeng,Tianhua Ren,Haibo Xie
The design and preparation of polymers by using biobased chemicals is regarded as an important strategy towards a sustainable polymer chemistry. Herein, two aromatic diols, 4-(hydroxymethyl)-2-methoxyphenol and 2-(4-(hydroxymethyl)-2-methoxyphenoxy)ethanol, have been prepared in good yields through the direct reduction of vanillin and hydroxyethylated vanillin (4-(2-hydroxyethoxy)-3-methoxybenzaldehyde) using NaBH4, respectively. The diols were submitted to traditional polycondensation and polyaddition with acyl chlorides and diisocyanatos, and serials of new polyesters and polyurethanes were prepared in high yields with moderate molecular weight ranging from 17,000 to 40,000 g mol−1. Their structures were characterized by1H NMR,13C NMR and FTIR, and their thermal properties were studied by TGA and differential scanning calorimetry (DSC), indicating that the as-prepared polyesters and polyurethanes have Tgin the range of 16.2 to 81.2 °C and 11.6 to 80.4 °C, respectively.
研究领域:
材料科学
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有机化学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Zhan-Ku Li,Hai-Tao Wang,Hong-Lei Yan,Jing-Chong Yan,Zhi-Ping Lei,Shi-Biao Ren,Zhi-Cai Wang,Shi-Gang Kang,Heng-Fu Shui
Ethanolysis is an efficient approach for converting lignites into chemicals under mild conditions. However, yield of soluble portion from lignite ethanolysis is limited and product distribution cannot be well regulated. In this paper, a series of catalysts (MMgAlO x , M = Cu, Zn, Co, Ni) were prepared by a coprecipitation method. The catalysts were characterized by X-ray powder diffraction, high resolution transmission electron microscope, N 2 physisorption, and CO 2 - and NH 3 -temperature-programed desorption. The results show that the catalysts have layered and mesoporous structures with tunable acidity/basicity. Catalytic ethanolysis of Xilinguole lignite was performed and the resulting ethanol-soluble portions (ESPs) were analyzed with a Fourier transform infrared spectrometer, thermogravimetric analyzer, and gas chromatograph/mass spectrometer. The results suggest that except NiMgAlO x , other catalysts significantly increased the yields of the ESPs, especially CuMgAlO x and ZnMgAlO x , which is probably related to the amount of H 2 produced from ethanol. Four major platform chemicals, i.e., arenes, phenols, alcohols, and esters, can be produced via the catalytic ethanolysis. The catalysts have high ethanolysis activity and low hydrogenation ability and therefore aromatic rings can be reserved. Distribution of the platform chemicals could be tuned by altering the catalysts. In addition, possible pathways on the catalytic ethanolysis were proposed.
研究领域:
化学工程
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能源化学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Yanyan Yu,Yilin Li,Yuhan Lou,Mengyuan Chen,Yongzhuang Liu,Haipeng Yu
Catalytic refining of lignin holds promise for producing sustainable platform chemicals. In this work, a gaseous hydrogen-free catalytic hydrodeoxygenation system is developed for upgrading lignin-derived phenols to alkane chemicals. Commercially available Raney Ni and HZSM-5 are used as a combinational catalyst, with isopropanol serving as the hydrogen-donating solvent. By modifying the temperature and the ratio of Raney Ni to HZSM-5, the reaction pathways for hydrogenation and deoxygenation can be tailored to specific requirements. As a result, a 97.1% yield of alkane fuels is achieved, with 64.4% propylcyclohexane and 32.7% propylbenzene obtained in one-pot reaction from the hydrodeoxygenation of 2-methoxy-4-propylphenol using a 3:1 mass ratio of Ni to HZSM-5, further increasing the ratio of HZSM-5 leads to a selectively production of propylbenzene in 62.0% yield. Through careful regulation of the catalytic system and the design of hydrogenation–deoxygenation pathways, excellent yields of 4-propylcyclohexanol (92.2%), propylcyclohexene (93.3%), and propylcyclohexane (93.2%) are directionally achieved. The catalyst maintained a conversion rate of over 99% after five cycles, demonstrating excellent robustness. This study offers a strategic system that expedites the selective upgrading of lignin-derived chemicals, heralding a pathway toward sustainable fuels and chemicals.
研究领域:
化学工程
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可再生能源
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Shurong Wang,Haizhou Lin,Yuan Zhao,Jingping Chen,Jinsong Zhou
Humin, a solid by-product formed during the acid-catalyzed conversion of carbohydrate to platform chemicals, can be further utilized by pyrolysis technology. In this study, two humins derived from glucose (humin-g) and xylose (humin-x) were characterized by elemental analysis, FTIR and 13 C NMR. Both humins were polymers rich in furan rings, and their carbon contents were more than 66%. Thermogravimetry and pyrolysis kinetic analyses based on Flynn-Wall-Ozawa and Friedman methods suggested that the activation energies for both humins increased as their conversion rates increased. At low conversion rates, the activation energy of humin-x was higher than that of humin-g, but this was reversed at high conversion rates. The results suggest that humin-g has better thermal stability following the removal of weak linkages at low temperature. Finally, Py-GC/MS was employed to study the product distribution from humin pyrolysis. The mechanisms for formation of typical products and the influence of temperature on product distribution are discussed.
研究领域:
化学工程
·
生物质能源
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Guojun Deng,Mengnan Sun,Yongqian Shi,Yuezhan Feng,Yuancai Lv,Longcheng Tang,Jiefeng Gao,Pingan Song
The leaked hazardous chemicals pose significant risks due to their harmful and combustible nature. Removing them from the environment has become an arduous task for both the industrial sector and academic community. In this paper, Ti 3 C 2 T x (MXene) nanosheets and metal-organic framework (ZIF-8 MOFs) functionalized polyurethane (PU) sponges (PU-Ti 3 C 2 T x -MOF sponges) were prepared by immersion coating and in-situ growth techniques. The as-prepared PU-Ti 3 C 2 T x -MOF sponge exhibited superior hydrophobicity with a water contact angle of 135°. Additionally, it demonstrated a higher adsorption capacity and rapid adsorption ability for liquid hazardous chemicals within 1 min, while still maintaining good reusability for adsorption. The PU-Ti 3 C 2 T x -MOF 2 sponge had the highest adsorption capacity of 48–91 times of its own mass for liquid hazardous chemicals. Furthermore, it demonstrated excellent reusability, maintaining its high adsorption capacity for oils and organic solvents even after being used 5 times. These results surpass previously reported data and highlight the superior capabilities of the PU-Ti 3 C 2 T x -MOF 2 sponge. Meanwhile, the PU-Ti 3 C 2 T x -MOF sponge maintained the excellent flame retardancy and compressibility . This work provides a new pathway for the design of functional polymer sponges and their potential application in rapid elimination of the leaked hazardous chemicals.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Sanping Zhao,Hailing Xi,Yanjun Zuo,Shitong Han,Yongbing Zhu,Zhanguo Li,Ling Yuan,Zhicheng Wang,Changcai Liu
The activation process of the B(OH) 3 -activated H 2 O 2 solution and its performance toward toxic industrial chemicals (TICs) and chemical warfare agents (CWAs) were investigated to find an efficient way to destroy TICs and CWAs. 11 B NMR analysis proved that B(OH) 3 reacted rapidly with basic H 2 O 2 to produce peroxoborates ([B(OH) (4− x ) (OOH) x ] − ), and the proportional contents were closely related to the pH and temperature. 1 O 2 and ·O 2 − were generated, and their production increased exponentially with pH. TICs thioanisole and paraoxon were used as simulants of CWAs to investigate the decontamination performance and nucleophilic/oxidizing reactivity of the B(OH) 3 -activated H 2 O 2 . Batch experiments proved that peroxoborates acted as the oxidants for the primary oxidation of the sulfide at a pH range of 8–12 and that ·O 2 − was responsible for the further oxidation of sulfoxide. Paraoxon degraded through OOH − -mediated S N 2 displacement with high stereo-selectivity, and the degradation rate increased exponentially with pH. Mustard gas, soman, and VX degraded effectively into nontoxic products in the B(OH) 3 -activated H 2 O 2 solution. A pH of 9–11 was recommended as the suitable acidity for developing the B(OH) 3 -activated H 2 O 2 solution to be a candidate for nucleophilic/oxidizing decontaminant, with advantages in rapid activation and low loss rate of reactive oxygen species .
研究领域:
环境科学
·
化学工程
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biofuels Bioproducts & Biorefining-Biofpr
·
2022
·Vol. 17
·期 2
·355-362
·
IF 5.239
Yanqian Gu,Shasha Liu,Gang Wu,Yinlong Wu,Shoujun Zhang,Yong Huang,Shu Zhang,Hong Zhang
Biomass is the sole carbon-containing renewable resource on Earth, and has high potential for the production of platform chemicals. Phenol, one of the most important platform chemicals, is generally derived from lignin conversion. In this study, the production of phenol from co-pyrolysis of cellulose and sodium borohydride at different mass ratios is investigated in detail. The results show that even a small amount of sodium borohydride (cellulose–sodium borohydride = 10:1) could effectively promote the conversion of cellulose to phenol through cellulose-derived levoglucosan intermediates. As the mass ratio of cellulose–sodium borohydride decreased, the relative content of phenol in the products significantly increased, and could be as high as 11.0% when the ratio of cellulose to sodium borohydride was 2:1. Glycosidic bonds in cellulose were considered to play an important role in its catalytic conversion. Furthermore, the resulting solid product could be used as a B-doping carbon material, which is desirable in various research fields. This study provided a novel method for the highly efficient utilization of cellulose. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
生物质能
·
化学工程
·
催化转化
✓ 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）