JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2026
·
IF 6.2
Zong-Pin Fu,Yun-Peng Zhao,Yu-Fa Wu,Qi-Jie Zhou,Shu-Ting Hu,Le-Le Qiu,Fang-Jing Liu,Mei Zhong,Jing Liang,Jing-Pei Cao
Mild thermal dissolution is an effective method for the clean, low-carbon conversion of lignite. However, the resulting products still contain numerous oxygen-bridged bonds and heavy molecular compounds, requiring further upgrading to serve as suitable feedstocks for fuels and chemicals. In this study, a supported Cu-Ni bimetallic catalyst was synthesized via a co-precipitation method and applied to the catalytic hydroconversion (CHC) of thermal dissolution portions from Zhaotong lignite (ZT) and lignite-related model compounds (LRMCs). Catalyst characterization revealed that metal particles were uniformly dispersed on the surface of the Cu-Ni/CoOx-CeO 2 catalyst, along with the formation of defect sites. The CoOx-CeO 2 support promoted surface oxygen vacancy formation. Furthermore, the incorporation of Ni altered the local coordination environment of Cu species through multicomponent interactions. The synergy between interfacial oxygen vacancies and Cu-Ni bimetallic sites significantly enhanced catalytic activity. Tests with LRMCs indicated that the Cu-Ni/CoOx-CeO 2 catalyst selectively cleaves C-O ether bonds under mild conditions, exhibiting both high selectivity and strong hydrogenation activity in the CHC of phenolic compounds. The catalyst also effectively promoted the CHC of macromolecular species in the soluble portion from ZT thermal dissolution, thereby converting phenolic compounds into cycloalkanol. These finding provides valuable insights for developing staged conversion routes and achieving value-added utilization of lignite.
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ACS Catalysis
·
2025
·
IF 13.1
Jingrong Li,Ying Wang,Tingting Xiao,Xinluona Su,Haiyang Cheng,Fengyu Zhao
Hydrogenation of aromatic molecules is a crucial industrial process that has been extensively employed in the synthesis of fundamental chemicals. In this work, the hydrogenation of bisphenol A (BPA) was studied over a kind of Ru/TiO2 catalyst. The catalytic activity of Ru/TiO2 was adjusted via manipulation of the metal–support interaction (MSI) by thermal treatment. The Ru/TiO2 exhibited a volcano-shaped dependence on calcination temperature, with the highest activity presented at 300 °C for the hydrogenation of BPA at mild conditions, produced 4,4′-isopropylidenedicyclohexanol (HBPA) with a yield of 99% at 80 °C, 4 MPa H2. The MSI could be adjusted by varying the calcination temperature, and flat Ru islands were formed at elevated temperatures, which facilitate the adsorption of the benzene ring of BPA. However, small-sized and electron-deficient Ru species prefer to adsorb H2. The Ru/TiO2-300 catalyst contains an appropriate composition of Ru nanoparticles and Ru flat islands, effectively balancing the competitive adsorption of H2 and BPA molecules, and thus exhibits high catalytic performance. Moreover, the Ru/TiO2-300 catalyst is highly efficient for a variety of aromatic compounds, producing the desired products selectively under mild conditions. Furthermore, it presented high stability without any loss in activity after 10 recycles. This work developed an efficient catalyst for the hydrogenation of aromatic compounds, and the insights into the catalytic mechanism will provide useful information to researchers in wide fields.
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JOURNAL OF CHROMATOGRAPHY A
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2022
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IF 4.601
Yang Feng,Min Sun,Mingxia Sun,Jiaqing Feng,Haili Sun,Juanjuan Feng
Polyamidoamine dendrimers with different generations (G1-G5) were synthesized in situ on silica progressively via Michael addition and amidation reactions. A sequence of materials was characterized by elemental analysis and Brunauer-Emmett-Teller test, the content of each element (C, H and N) was increased but the surface area was reduced gradually from G1 to G5. These materials were separately packed in a stainless steel column (10 × 4.0 mm, i.d.) for SPE . These SPE columns were combined with high performance liquid chromatography (HPLC) to establish an online SPE-HPLC analysis. According to the chemical structures of materials, polycyclic aromatic hydrocarbons (PAHs) and bisphenols as model analytes were selected to investigate the extraction performance and the extraction mechanism, so as to reveal the extraction performance-structure relationship of G1-G5. The extraction performance was improved with the increase of functional groups from G1 to G4 or G5, the hydrophobic effect played main role accompanied with possible weak hydrophilic, hydrogen-bonding and electrostatic interactions in extraction mechanism. The adsorption capacity, enrichment factor, partition coefficient and extraction efficiency for PAHs and bisphenols reached to 17.52 µg g −1 and 2.70 µg g −1 , 5353 and 3002, 5066 and 1197, and 90.09% and 60.05% respectively. Compared with commercial SPE materials, these dendrimer-grafted silica materials were inferior to C18, but better than silica. Furthermore, the G4 and G5 were separately selected to develop two online SPE-HPLC analytical methods for determining trace PAHs and bisphenols in real water samples, and satisfactory results were obtained.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
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IF 19.503
Chong Wang,Yuchen Hou,Jiajia Cheng,Mei-Jin Lin,Xinchen Wang
Oxidation, especially selective oxidation by a heterogeneous catalyst with molecular oxygen, is a core technology for the conversion of petrochemical feedstock to commodity chemicals and pharmaceuticals. Existing catalytic approaches for efficient aerobic oxidation normally rely on the engagement of organometallic centers or transition-metal nanoparticles. In light of the necessity to develop sustainable production methodologies, multiple approaches for the metal-free polymeric carbon nitride (PCN) photocatalytic selective oxidation have been evaluated. However, the insufficient visible light optical absorption, poor charge-carriers separation and the weak driving force towards oxidation reaction impart a serious restriction on the efficiency and selectivity of the organic photosynthesis, especially under extended wavelength solar light irradiation. Here, we report a surface engineering photochemical modification method to fabricate a donor-acceptor (D-A) functional carbon nitride photocatalyst (ECN) under ambient conditions. The well-developed d -A structure, preserved high crystallinity and enlarged π-conjugation framework of the hybrid semiconductor-molecule ECN samples favor the improvement of the optical absorption, as well as the enhanced separation and migration of the photo-generated charge carriers. As a result, the obtained ECN photocatalysts exhibited remarkable enhancement in the photocatalytic aerobic oxidation of alcohols, even under an extended light wavelength of 620 nm red-light irradiation. The photocatalytic aerobic sulfides and sp 3 C–H oxidation reactions were also considerably accelerated over ECN and may serve as a direct approach for the construction of value-added sulfoxide and ketone products.
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AICHE JOURNAL
·
2021
·Vol. 67
·期 6
·e17197
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IF 3.993
Liyun Huang,Kui Wu,Qian He,Chao Xiong,Tao Gan,Xiaohui He,Hongbing Ji
Single atom catalysts (SACs), featured with atomically dispersed metal species, have been considered as one of the most promising catalytic materials because of the excellent performance in various high-value-added reactions. However, the large-scale and continuous-type production of such SACs is still challenging. Herein, a novel and facile microcapsule strategy for the quasi-continuous synthesis of iron SACs supported on S, N co-doped carbon (Fe/SNC) is developed, and the Fe species are presented as isolated active sites and stabilized as the FeN 3 S-like structure. The as-prepared Fe/SNC catalysts exhibit excellent catalytic properties for selective oxidation of arylalkanes, which followed pseudo-first-order kinetics with an E a = 41.5 kJ/mol. More importantly, the two Fe/SNC catalysts synthesized at different continuous times showed essentially identical catalyst structure and catalytic performance, demonstrating the superior reliability of our microcapsule strategy for the quasi-continuous production of SACs, which can be easily scaled up to industrial application.
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FUEL
·
2020
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IF 5.578
Xingfei Tang,Wentao Ding,Hao Li
Bio-oil, one of significant renewable energy, was blocked from its direct application by thermodynamic instability due to the high oxygen content, so its deoxygenation needs urgent solution. Avoiding the disadvantages of the traditional catalytic method, such as harsh reaction conditions, potential explosion risk and environmental pollution, we utilize solid-acidic zeolites as low-load Pd-based catalyst supports instead of corrosive acid additives, with polymethylhydrosiloxane (PMHS) as the hydrogen-supplying agent, to achieve efficient hydrodeoxygenation of bio-oil models (carbonyl compounds) under mild conditions. The reaction conditions such as Si/Al ratio of HZSM-5 zeolite, temperature, solvent, and the type of Pd salts precursor are optimized. In particular, we have found that polar protic solvents improve catalytic efficiency by promoting proton transfer in the reaction. In an open-to-air, 97.9% ethylbenzene yield can be obtained for acetophenone conversion under mild conditions (0.5 wt% Pd/HZSM-5(18), 65 °C, 3 h, n-butanol as solvent), which is more efficient and environmental friendly than currently reports. Meanwhile, hydrogenation–dehydration mechanism was proposed, and the Brønsted acid in HZSM-5 promotes the dehydration of the alcohol (rate-limiting step) by efficiently accelerating the removal of hydroxyl groups and the proton transfer of the reaction. Furthermore, the catalytic scheme exhibits the excellent stability (reusable seven times) and versatility. The potential of a green catalytic technology using with PMHS opens attractive opportunities for bio-oil upgrading.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Qifeng Yang,Yiming Mo
Selective oxidation of high-energy C–H bonds to produce carbonyl compounds is a fundamental transformation in fine chemical synthesis. Despite tremendous efforts, the development of green and safe strategies often suffers from harsh reaction conditions and uses homogeneous transition-metal catalysts. Herein, we present an electrochemical oxidation strategy that is green and safe for the direct oxidation of benzylic C–H bonds using La2O3 nanoparticles supported on a carbon paper (La2O3/CP) anode. La2O3/CP can selectively oxidize indane to indanone in 83% yield with 73% Faraday efficiency at room temperature. It also can oxidize different kinds of compounds with benzyl C–H bonds to produce the corresponding ketones with moderate-to-excellent yields. The oxygen source was confirmed to be water by an oxygen isotope (18O) tracer experiment. Additionally, the La2O3@C/CP composite electrode was reconfigured through carbonizing oleic acid to stabilize La2O3 on CP, resulting in an improved stability due to the reinforced catalyst embedding on CP, and retaining 81% initial activity after five cycles.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
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IF 4.4
Haobo Xie,Mingu Zhou,Xiaorui Cui,Chao Li,Yongjun Wu,Xinjuan Luo,Mao-Sen Yuan
The vitamins of riboflavin and folate are necessary nutrients for maintaining the proper functioning of human body. Riboflavin and folate deficiency will cause nerve damage, leading to peripheral neuritis, depression, tongue inflammation and other diseases. The sensitive detection of riboflavin and folate keeps its significance for patients and food quality control. In this study, a quinoline-pyridine-combined chemosensor ( HQ-TPE ) modified by tetraphenylethene was developed. After chelating Cd 2+ , the chemosensor exhibited high selectivity and sensitivity for riboflavin and folate. Moreover, it can discriminate the two different vitamins through different fluorescent responses, which should arise from the different intermolecular π-π interactions between the sensor HQ-TPE and the analyte upon coordination of riboflavin or folate with Cd 2+ . More importantly, the chemosensor could be used in visual semi-quantitative determination of riboflavin and folate in real samples (milk and lettuce). Therefore, the sensor presented here will not only be a powerful tool for the detection of riboflavin and folate, but also provides a new template for the design of metal complex as fluorescent sensor.
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Molecular Catalysis
·
2018
·
IF 0
Shanshan Jie,Congqiang Yang,Yuan Chen,Zhigang Liu
The highly dispersed active sites are desirable to optimize the atom efficiency. In this study, a series of novel cobalt grafted in N-doped carbon (Co-N-C) catalysts for selective oxidation of ethylbenzene are synthesized by heating a solution of cobalt porphyrin and peptides in ionic liquids, which are also characterized by techniques such as FT-IR, XRD, SEM-EDX, HR-TEM, and XPS. The results show that the as-prepared catalysts have an attractive catalytic performance, namely, 40% of ethylbenzene conversion and 75% of selectivity to acetophenone. Especially, the activity and selectivity of the as-prepared catalysts remain almost similar even after the 10th run. Moreover, the modified-complexometry method is verified to improve the dispersion of metal active sites. The remarkable catalytic performance of the as-prepared catalysts is attributed to the highly dispersed active sites and strong interactions between Co and N species in Co-N x moieties.
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ACS Omega
·
2024
·
IF 3.7
Xuan Yan,Yucheng Liu,Zhengmeng Hou,Lina Yuan,Jun Yang,Wenxin Dong
The chemical cleaning method is the simplest approach for degreasing oil-based drilling cuttings (ODCs), with the effectiveness of the treatment relying mainly on the selection of the surfactant and the cleaning conditions. However, achieving the standard treatment of ODCs directly using conventional surfactants proves challenging. In light of this, this study introduces a synthesized and purified Gemini surfactant named DCY-1. The structure of DCY-1 was confirmed through Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) analyses. The characterization in this article encompasses the use of an interface tension meter, nanoparticle size analysis, scanning electron microscopy, and infrared oil measurement. The critical micelle concentration (CMC) of DCY-1 was determined to be 3.37 × 10–3 mol/L, with a corresponding γcmc value of 37.97 mN/m. In comparison to conventional surfactants, DCY-1 exhibited a larger micelle size of 4.52 nm, approximately 24.52% larger than that of SDS. Moreover, the residual oil rate of 3.96% achieved by DCY-1 was the lowest among the chemical cleaning experimental results. Through a single-factor experiment, the optimal cleaning ability of DCY-1 for ODCs was determined as follows: a surfactant concentration of 3 mmol/L, a temperature of 60 °C, an ODC/liquid mass ratio of 1:4, a cleaning duration of 40 min, and a stirring speed of 1000 rad/min. Under these optimal conditions and after merely two cleaning procedures, the residual oil content of ODCs was reduced to 1.64%, accompanied by a smooth and loose surface structure.
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DYES AND PIGMENTS
·
2016
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IF 4.055
Miao Luo,Sheng Wang,Meiling Wang,Shaorong Huang,Chengpeng Li,Lin Chen,Xiang Ma
Two novel aggregation-induced emission compounds harnessing Excited-State Intramolecular Proton Transfer process based on salicylideneaniline derived from tetraphenylethylene and cholesterol moieties were synthesized and characterized. One of the compounds could gelate in cyclohexane exhibiting gelation-induced enhanced emission and the emission intensities can be reversibly changed with the gel-solution transition by alternate cooling and heating. Moreover, this compound showed photochromic behavior both in gel and solid states under UV light irradiation due to the loose packing of the molecules and permitting the molecule to rotate, which may be a potential candidate for external stimuli-responsive materials through tuning the self-assembly process of the functional gelator.
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FUEL PROCESSING TECHNOLOGY
·
2017
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IF 3.752
Zhong-Qiu Liu,Xian-Yong Wei,Xiao Zhou,Yu-Chuan Xiao,Zhan-Ku Li,Xian-Hou Guo,Sheng-Kang Wang,Yang-Yang Zhang,Zhi-Min Zong,Feng-Yun Ma,Jing-Mei Liu
An acidic ionic liquid modified microfiber attapulgite (MFA)-supported nickel was prepared by thermally decomposing nickel tetracarbonyl onto MFA modified with an acidic ion liquid (AIL, 1-sulfobutyl-3-methylimidazolium trifluoromethanesulfonate). It was characterized with multiple instruments and used for catalyzing hydroconversion of coal-related model compounds (CRMCs) di(1-naphthyl)methane, diphenylmethane , bibenzyl, and 1,3-diphenylpropane. The results indicate that Ni/MFA@AIL effectively catalyzes hydroconversion of the CRMCs to afford cyclanes and alkylcyclanes by inducing the formation of H + , H − , and biatomic active hydrogen species.
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危险品化学品经营许可证（带存储）