ACS Omega
·
2025
·
IF 4.3
Yong Qu,Jingmei Liu,Xiaodong Zhou,Lang Liu,Ruitao Ma,Yongguo Su,Chunmei Ma,Pengtao Sun
Low-temperature coal tar (LTCT) is the preferred raw material for the catalytic hydrogenation of coal tar. In order to study and popularize the technology of preparing fuel oil by hydrogenation of LTCT, it is necessary to research its composition and structural characteristics. Heavy hydrogenated coal tar (HHCT) from a company in Xinjiang, which is a mixture of hydrorefined tail oil distillate (>350 °C) and hydrotreated circulating tail oil (>350 °C). To make scientific and customized use of HHCT, the chemical composition and molecular structure characteristics of HHCT and its subcomponents were investigated by using elemental analysis (EA), infrared analysis (FT-IR), and nuclear magnetic resonance (1H NMR and 13C NMR) through fraction separation. Compared to other low-temperature coal tar (LTCT), the content of saturates (SA) in HHCT is 95.01 wt %, considerably higher than other LTCT samples, and the content of aromatics (AR), resins (RE), and asphaltenes (AS) is all much lower than other LTCT samples. Compared with the basic properties, elemental content, and refining performance of other crude oils, HHCT is good-quality oil with relatively small density, high H/C ratio, fewer heteroatoms, and low metal impurities, and is easy to refine and process. FT-IR and NMR results show that HHCT and SA are primarily constituted of long-chain n-alkanes possessing longer aliphatic chains and fewer branched chains. Aromatics are predominantly present in AR and mainly encompass bicyclic and tricyclic aromatics. HHCT and other fractions contain a small quantity of aromatic structures.
研究领域:
能源化学
·
石油加工
·
燃料化学
·
分析化学
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煤化工
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有机地球化学
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材料化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Zhen-Yi Du,Xia Wang,Zhi-Hua Zhang,Jie Feng,Yu-Hong Qin,Bin-Bin Zhang,Wen-Ying Li
The reforming characteristics of biomass volatiles on anthracite chars were investigated by comparing the structural evolution of tars derived from cellulose and lignin as the major biomass components. In a two-stage quartz reactor, the pyrolysis volatiles of cellulose and lignin were produced in the first stage and then reformed in the second stage with or without the presence of anthracite chars between 600 and 900 °C. The results show that the presence of anthracite chars enhanced the destruction of volatiles of both feedstocks. Furthermore, the tar yields of lignin showed a slower decreasing trend with temperature than those of cellulose, suggesting that the lignin volatiles were more refractory to be reformed. The lignin tars had higher molecular weights and contained higher percentage of compounds with large aromatic ring systems (≥3 fused benzene rings) than cellulose tars in the studied temperature range. Compositional analysis revealed that tars of both feedstocks experienced the transition from phenolic compounds to polycyclic aromatic hydrocarbons with increasing temperature. The surface areas of anthracite chars were reduced because of coke deposition after interacting with the volatiles of both feedstocks below 800 °C, above which the net gasification of chars took place.
研究领域:
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 7
·816
·
IF 2.881
Ziang Xu,Guiying Xu,Beibei Han,Kun Wang,Hui Ge,Baigang An,Dongying Ju,Maorong Chai,Lixiang Li,Weimin Zhou
To provide an effective method of green aquaculture, the photocatalysts of CuO/ZrO2/CB/coal-tar-pitch-SAC, which have visible light sterilization capacity, were successfully fabricated by coating ZrO2and CuO on the surface of CB/coal-tar-pitch-SAC. The structures of synthesized CuO/ZrO2/CB/coal-tar-pitch-SAC were investigated by XRD, XPS and SEM measurements in detail. It was observed that CuO/ZrO2/CB/coal-tar-pitch-SAC materials possess obvious heterojunction structure and excellent visible light sterilization capacity when the prepared weight ratio of CuO, ZrO2and CB/coal-tar-pitch-SAC is controlled as 0.03:0.3:1. Our studies can provide a beneficial reference for the design of photocatalysts with sterilization capacity in visible light.Keywords:photocatalyst;heterojunction;coal tar pitch;green aquaculture;ZrO2
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
WASTE MANAGEMENT
·
2019
·
IF 5.431
Chenyu Wang,Wei Zhu,Hao Zhang,Cheng Chen,Xihui Fan,Ying Su
The hydrothermal gasification of dewatered sewage sludge converts waste into syngas fuel (gas containing H 2 , CH 4 , CO, and CO 2 ), but the formation of char and tar by a side reaction restricts practical applications. In this study, the formation of char/tar by the hydrothermal gasification of dewatered sewage sludge at 300–400 °C for 5–90 min with a heating rate of 8–50 °C/min is investigated. The results showed that the formation of tar/char reached equilibrium after 30 min, and an increase in the temperature and heating rate reduced the char yield. However, a higher tar yield was achieved at the highest temperature. Experiments on sludge with different moisture contents were also conducted, and the formation of char/tar was inhibited at a higher moisture content. The addition of NaOH and H 2 O 2 can effectively reduce the char and tar yields, respectively. A lumped kinetic model for describing carbon conversion during the hydrothermal gasification of sewage sludge was developed to elucidate the char/tar formation mechanism. The experimental data were used to determine the model parameters, and the fitting results showed that solid–solid conversion from organic matter in sludge was the predominant char/tar formation pathway, with an activation energy of 7.1 kJ/mol. The experiments using the model compounds indicated that humus and protein are the main precursors of char and tar, respectively. This study provides insights for understanding the formation of char/tar from sewage sludge following hydrothermal gasification, which is vital for controlling the formation of char and tar to improve the gasification efficiency.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Gao Feiyue,Zhou Chuncai,Cao Yachuan,Yu Yue,Li Yunfei,Liu Guijian
As a highly toxic rare metal, the removal of thallium (Tl) from wastewater has been widely investigated, and adsorption is considered one of the most promising treatment technologies for Tl-containing contaminated water because of its cost-effectiveness, convenience, and high efficacy. In this work, coal tar residue (CTR)-based porous carbon was synthesized through K 2 FeO 4 activation, and applied in adsorbing Tl(I). K 2 FeO 4 could synergistically produce porosity and load iron oxide on the produced porous carbon surface because of the catalytic cracking and oxidative etching during the activation of CTR. The adsorbent was synthesized at 800 ℃ with a mass ratio of K 2 FeO 4 /CTR being 3 (PC 3–800 ) showed optimal Tl(I) adsorption performance. The removal efficiency and distribution coefficient of PC 3–800 were above 95 % and 10 4 mL/g, respectively, in a wide pH range (4−10). Furthermore, the selection and reusability of PC 3–800 were favorable. The adsorption was a spontaneous, exothermic, and entropy increase process. The adsorption process was dominated by electrostatic attraction, surface complexation, and surface oxidation . The results suggested that removing Tl(I) from contaminated water via CTR-based porous carbon was feasible.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Tingwei Wang,Hanpeng Liu,Sam Toan,Zhao Sun,Zhiqiang Sun
Deoxygenation-based biomass gasification provides a feasible solution for the effective utilization of biomass and value-added syngas production. However, the behavior of bio-oil formation during the pyrolysis stage and the characteristics of tar abatement at the gasification stage with applied deoxidizer still require exploration. Thus, this study investigates the effects of different deoxidizer/biomass (D/B) mass ratios, pyrolysis-gasification temperatures, and water-injection velocities on the composition and yield of bio-oil and tar-elimination law. The techniques of 2D HSQC nuclear magnetic resonance, attenuated total reflectance, gel permeation chromatography, and gas chromatography-mass spectrometer are used to investigate the formation behavior and evolution law of the bio-oil produced. The results indicate that the addition of the deoxidizer not only improves the quality and yield of syngas but promotes the deoxygenation of oxygen-containing bio-oil by donating electrons. Specifically, the phenolic compounds decreased by 12.4% under D/B = 0.3 as compared with D/B = 0. The results also confirm the promoting effect of tar elimination via reforming and cracking by Fe and CaO, respectively: Tar production during the gasification stage decreased by 54% under D/B = 0.3, as compared with non-deoxygenation. This study demonstrates the superiority of iron-calcium-based deoxidizer in bio-oil deoxygenation and tar elimination, which will promote the development of deoxygenation-based bio-oil and syngas poly-generation.
研究领域:
能源与燃料
·
环境科学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2021
·
IF 5.061
Chenlong Liu,Plaifa Hongmanorom,Jangam Ashok,Dong Chen,Qiao Wu,Wenju Wang,Zhigang Wang
Conversion of biomass tar to useful hydrogen-rich syngas will solve environmental issues related to tar emission as well as increase the overall efficiency of biomass conversion . There are various catalysts to achieve that. In this study, La 1-x Ce x Ni 0.8 Fe 0 . 2 O 3 (0 ≤ x ≤ 1) is selected, and acetic acid has been used as a biomass tar model. Fixed-bed reactor was used for this investigation, while the catalyst characterization has been done mainly by X-ray Adsorption spectroscopy (XAS), X-ray diffraction (XRD), CO 2 -temperature programmed desorption (TPD). The results showed that La 0 . 8 Ce 0 . 2 Ni 0 . 8 Fe 0 . 2 O 3 has the highest acetic acid conversion (68.7%) and hydrogen yield (63.6%). Which is attributed to its more catalytic defect, stable structure and stronger basicity . Furthermore, to express more comprehensively on tar models, La 0 . 8 Ce 0 . 2 Ni 0 . 8 Fe 0 . 2 O 3 were investigated with blends of acetic acid and acetone with different mole ratios (1:0, 4:1, 3:2, 2:3, 1:4 and 0:1) in temperature ranges (500 °C–900 °C), and weight hourly space velocity (WHSV = 12.02 h −1 -15.63 h −1 ). The highest carbon conversion (85.7%) and hydrogen yield (88.5%) were obtained at 600 °C, mole ratio = 4:1, and WHSV = 14.43 h −1 . It is noted that the result of the blend was better; however, based on in situ diffuse reflectance infrared fourier transform spectroscopy ( in-situ DRIFTS) investigation, the enhancement ascribed to inhibition of ketonization reaction was occurred with pure acetic acid. In addition, high reaction temperature and weight hourly space velocity decrease the catalytic activity by accelerating sub-reaction and graphitization coke deposition. In a word, La 0 . 8 Ce 0 . 2 Ni 0 . 8 Fe 0 . 2 O 3 catalyst shows good performance with hydrogen yield over 70% during 1440 min at optimum conditions.
研究领域:
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Xiaoning Zhang,Buning Chen,Jianwei Wang,Yusheng Zhou,Xueli Huang,He Huang
Background Molybdenum disulfide is one of the main catalysts used in slurry-bed reactors. However, monolayer molybdenum disulfide with high hydrogenation activity is extremely difficult to obtain owing to the van der Waals forces between layers. Methods MoTi-X catalysts with different MoS 2 loadings were synthesized using a hydrothermal method. Changes in the active phase of MoTi-X during hydrogenation were also analyzed by TEM, XPS, and Raman spectroscopy. Significant findings MoTi-X catalysts synthesized by a two-step hydrothermal process allowed for the simultaneous generation of monolayer MoS 2 and hydrogenation. The results of the phenanthrene-phenol co-hydrogenation system showed that the different active sites on MoS 2 were responsible for its Hydrogenation and Hydrodeoxygenation properties. Using MoTi-X to catalyze coal tar (CT) hydrogenation, the total content of gasoline and diesel fractions was increased by 11.3 %, which is 3.3 times more effective than industrial four-stage hydrogenation. The average molecular mass, viscosity, and density of the coal tar were reduced by 35 %, 96 %, and 6 %, respectively. The application of MoTi-X catalysts for CT hydrogenation can fill the gap in the research on CT slurry-bed hydrogenation catalysts and improve the competitiveness of enterprises.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xiaoning Zhang,Buning Chen,Jianwei Wang,Yusheng Zhou,Xueli Huang,He Huang
The high content of heteroatoms and trace metals makes it difficult to upgrade poor-quality oils (PQO). The co-pyrolysis or co-hydrogenation of coal tar (CT)/vacuum residue (VR) is a new approach for the efficient utilization of PQO. The products of CT/VR co-pyrolysis and co-hydrogenation were characterized by RV, TG-FTIR, and GC × GC-TOF. Co-pyrolysis reduces the reaction harshness by lowering the activation energy of pyrolysis. Co-pyrolysis changes the reaction paths of oxygen-containing free radicals by promoting the generation of oxygen-containing organic compounds and inhibiting coke generation by increasing the pyrolysis spillover of unsaturated hydrocarbons. Co-hydrogenation increased the gasoline and diesel yields while reducing coke production. The saturates, aromatics, resins, and asphaltenes of CT and VR experienced a significant increase in the gasoline and diesel fractions after hydrogenation. The gasoline and diesel content enhancement in the four-component hydrogenation products of CT increased with increasing polarity, whereas the opposite trend was observed for the four-component hydrogenation of VR. There was a clear synergistic effect between the aromatics of CT and VR in terms of hydrogenation saturation, while the synergistic effect of the aromatics was somewhat weaker. The saturates and resins had an inhibitory effect on each other.
研究领域:
能源化学
·
石油化工
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2018
·
IF 1.171
Hai-xiao Yang,He-xiang Han,Ji-tong Wang,Wen-ming Qiao,Li-cheng Ling
Novel high-carbon-yield pitches were prepared through the iodination of 1-methylnaphthalene (1-MNP) followed by dehydroiodination/polycondensation. 1-MNP was first iodinated by I 2 with the aid of I 2 O 5 , yielding mainly 1-iodo-4-MNP. Then, a thermal-dehydroiodination reaction at a comparatively low temperature of 130–180 o C was carried out to condense the iodinated products to obtain the pitches. The structures of the iodinated products and pitches were investigated by TG, GC-MS, 1H-NMR and FT-IR. Results indicated that the iodination selectivity ( S mb) reached 96.4% when 0.75 mol I 2 and 0.18 mol I 2 O 5 reacted with 1 mol 1-MNP at 60 o C for 24 h in acetic acid. Ring-hydrogenation products (tetralin, 5-methyltetralin) and methyl migration products (2-MNP, dimethylnaphthalene and trimethylnaphthalene) were found in the pitches by analyzing their methanol-soluble fractions. Dehydroiodination substantially increased the degree of polymerization and carbon yield of the pitches. The pitches exhibited high polymerization degrees (toluene soluble fraction less than 12 wt%), high carbon yields (54–66 wt%) and complicated 1-MNP molecular assembly patterns including α-α′, α-β′, β-β′, depending on dehydroiodination temperature and time. The iodination/dehydroiodination approach is simple, mild and clean for preparation of high quality pitches for high performance carbon materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zhirong Yang,Jing Zhang,Jiejie Huang,Gang Qian,Xuezhi Duan,Xinggui Zhou
To promote biomass-derived tar and coke upgrading, biomass pyrolysis intensification was utilized by the co-pyrolysis of biomass and caking coal with suitable particle size. The intensification led to a 15% increase in light tar fraction in tar, indicating a transformation from heavy tar to light components (phenols, aliphatic hydrocarbons). Moreover, the resulting coke achieved high strength (M25 > 80%) that can meet the requirement for moving bed gasification. To further facilitate tar upgrading and alleviate secondary reactions of volatiles that result in more secondary-coke and less gas, calcium-based Ca@Cu catalysts were synthesized and then loaded along the predicted coke cracks to improve tar quality without compromising coke granularity and strength. The results indicated that the catalytic upgrading mitigated the formation of pyrolytic water and secondary-coke, and dramatically improved tar quality as the light tar fraction in tar increased by 15–30%. Specifically, the upgraded light tar contains more phenols, naphthalenes, and anthracenes but less acids, ketones, and furfurals. It was postulated that selective cleavage of oxygen-containing functional groups (mainly ether bonds) promoted tar reconstruction to release more light aromatics during the catalysis. The coke strength continued to increase by 3–6%, possibly due to mitigation of H2O formation as indicated by more oxygen-containing groups retained in the aromatics during the Ca@Cu catalysis. The current study provided a new strategy to simultaneously upgrade coke and tar during catalytic pyrolysis of biomass for efficient utilization of the biomass.
研究领域:
能源与燃料
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Linlin Huang,Xuwen Zhang,Tingting Liu,Lin Wang,Lixin Li,Da Li,Tao Sheng,Zilong Dong,Xinyue Zhao
A coal tar pitch-based porous carbon adsorbent (CPA) was synthesized through a straightforward method involving the heating of a mixture of KOH and coal tar pitch (CTP). This CPA exhibited a high surface area of 1811.2 m2 g–1 and a large pore volume of 0.94 cm3 g–1 when prepared with a CTP to KOH mass ratio of 1:4 at 800 °C. Parameters such as the heating temperature and activator dose were optimized to enhance the adsorption efficiency. The prepared CPA was extensively characterized by SEM, XRD, FTIR, and BET measurements. Notably, CPA presented a distinct adsorption performance for Orange G (OG), achieving a maximum adsorption capability of 449.7 mg g–1. Kinetic studies indicated that the adsorption process followed the pseudo-second-order model, while the adsorption isotherm data demonstrated that both chemical and physical interactions favored OG adsorption. Thermodynamic analysis revealed that the adsorption of OG on CPA was spontaneous and exothermic and increased the entropy. Density functional theory (DFT) calculations provided insights into the adsorption mechanism, highlighting electrostatic interactions, hydrogen bonds, and π–π interactions as the dominant processes governing OG adsorption onto the adsorbent.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）