APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Cederick Cyril Amoo,Joshua Iseoluwa Orege,Qingjie Ge,Jian Sun
Fuel production is an option for valorizing CO 2 , yet deficient catalysts meeting the standard fuel production has impeded progress of this promising technology. Herein, liquid fuel synthesis is rationalized over a catalyst consisting ‘C′, ‘Na’, and ‘Fe’, as in NaFe@C, configured with ZSM-22 and ZSM-5 in CO 2 hydrogenation. While the ‘Na’ and ‘C′ functioned as structural promoters on Fe to enhance CO 2 conversion and olefins synthesis, the characteristics of the zeolites facilitated oligomerization of lighter hydrocarbons. A high C 5 + selectivity was obtained over the HZSM-22 composite in CO 2 hydrogenation dominated by olefins and isoparaffins. Model reactions for exemplar oligomerization activity over the zeolites revealed ZSM-5 as highly active with selectivity towards isoparaffins and aromatic. The ‘Na’ cations induce Lewis’s acid sites (LAS) which suppresses hydrocracking during chain growth. This consistency, revealed between the model and CO 2 hydrogenation unlocks a door to zeolite usage in CO 2 hydrogenation to clean heavy hydrocarbons.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Haidong Xie,Chunping Hou,Yuqing Qu,Hui Tian,Hui Lu,Jiandong Wu,Shaolin Yang,Yong Ma
SiO x has become one of the most promising anode materials for lithium ion batteries due to its high specific capacity, abundant natural resources and suitable lithium insertion and extraction voltage. However, the low conductivity and the poor cycle performance seriously hinder its practical application. In here, a simple and effective method is proposed to disperse SiO x between carbon materials including flake graphite, reduced graphene oxide (rGO) and carbon nanotubes (CNTs), and then micron-sized N-SiO x /graphite/rGO-CNTs@C (N-SiO x /C@C) composite with dense structure is prepared by coating and pyrolysis of pitch. The synergistic effect of various carbon materials is beneficial to improve the conductivity of the material, and maintain the structural integrity during the cycle. The obtained N-SiO x /C@C anode exhibits high reversible capacity (980.2 mAh·g −1 ), excellent cycle stability (70 % capacity retention after 500 cycles at 0.5 A·g −1 ) and excellent rate performance (491.9 mAh·g −1 specific capacity of at 5 A·g −1 ). The strategy provided here effectively improves the electrochemical performances of SiO x , and the prepared materials show great application potential in the field of lithium ion batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongyu Niu,Xing-Bao Wang,Jingjie Luo,Jiaxin Liu,Chuang Li,Wen-Ying Li,Changhai Liang
Desulfurization plays a critical role in refining crude oil to produce fuel and the manufacture of fine chemicals. However, its low efficiency becomes a great challenge for the present desulfurization if only the C-S cleavage is considered a promising approach to reducing hydrogen consumption under atmospheric pressure. Accordingly, we investigate the critical factors necessary to achieve high C-S cleavage of dibenzothiophenes under mild conditions of 0.1 MPa and H 2 /oil = 100. The mechanism of reactive adsorption desulfurization of dibenzothiophenes with or without steric hindrance at atmospheric pressure on Pt/ZnO is proposed by studying the adsorption model of active metal sites, the Pt efficiency in C-S cleavage influenced by the steric hindrance and the structural evolution of Pt active centers in the presence of sulfur adsorption/deposition. Based on both experimental and DFT results, we report C-S cleavage of dibenzothiophenes with (TOF = 15 h −1 ) or without steric hindrance (TOF = 128 h −1 ) that can be highly efficiently fractured (99.9%) by the interface between PtS x and ZnO . This work has great practical significance for developing atmospheric industrial adsorbents for ultra-deep reactive adsorption desulfurization.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Changzhi Yin,Kang Du,Zhengyu Zou,Xiaoqiang Song,Ying Xiong,Fei Wang,Meng Zhang,Weicheng Lei,Yaodong Liu,Wenzhong Lu,Chunchun Li,Wen Lei
A novel microwave dielectric ceramic of SrGa 2 Si 2 O 8 was synthesized using the traditional solid-state method. Its phase composition, microstructure, and microwave dielectric properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy , and network analyzer . XRD results indicated that the space group of the ceramic transformed from I 2 /c to P 21 /a at 700 °C. A combination of good microwave dielectric properties was obtained at 1260 °C with ε r = 6.3, Q × f= 96,600 GHz and τ f = −45.2 ppm/°C at 16.5 GHz. The negative τ f can be tuned to near zero by adding 15 mol% CaTiO 3 . The densification temperature can be reduced to 940 °C by adding 4 wt% LiF. Moreover, the SrGa 2 Si 2 O 8 ceramic had good chemical compatibility with the Ag electrode. A patch antenna was designed using the 0.85SrGa 2 Si 2 O 8 + 0.15CaTiO 3 + 4 wt% LiF ceramic. The antenna had a high radiation efficiency of 99.2 % and a gain of 2.988 dBi at the center frequency of 4.261 GHz. All results indicated that the SrGa 2 Si 2 O 8 ceramic has promising potential for applications in 5 G wireless communication technology.
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Catalysts
·
2022
·Vol. 12
·期 11
·1328
·
IF 4.501
Liang-Qiu Huang,Zhi-Jun Diao,Bo Chen,Qing-Pan Du,Kai-Yang Duan,Si-Jia Zhao
Efficient depolymerization of C–O linkages is essential for converting lignin into fuels and higher value-added chemicals. In this work, CoRuP/SiO2, an amorphous Ru-Co phosphide composite, was fabricated for the efficient hydrogenolysis of ether linkages. The 4–O–5 andα–O–4 linkages containing lignin-related compounds, such as diphenyl ether, benzyl phenyl ether, 3-methyl diphenyl ether, and dibenzyl ether, are selected as representatives of linkages in lignin. Under mild conditions, Ru-containing metallic phosphides have high-performance for the catalytic depolymerization of C–O linkages. Compared with other catalysts, CoRuP/SiO2shows an outstanding selectivity for benzene and excellent efficiency in depolymerizing diphenyl ethers, yielding only a small amount of by-products. Furthermore, the total acidity shows a linear relationship with the hydrogenolysis reactivity in cleaving aromatic ether bonds. The mechanisms for the catalytic hydrogenolysis of 4–O–5 andα–O–4 bonds over CoRuP/SiO2are proposed. Moreover, two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance spectroscopic analysis demonstrates that CoRuP/SiO2could effectively depolymerize C–O bonds of lignin. These dominant hydrogenolysis products from lignin have excellent potential in the production of high value-added drugs or pharmaceutical intermediates. The hydrogenolysis of lignin can be a highly efficient alternative to the existing method of lignin utilization.Keywords:hydrogenolysis;C–O linkages;metallic phosphides;reaction pathway
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NEUROCHEMICAL RESEARCH
·
2022
·Vol. 48
·期 2
·393-403
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IF 4.414
Ma Zijian,Ma Yang,Cao Xuefeng,Zhang Yunpeng,Song Tieying
Postoperative neurocognitive impairment (POCD) is a common complication after surgery and anesthesia, especially in elderly patients. Avenanthramide-C (AVC) test is a vascular endothelial cell adhesion molecule inhibitor with strong anti-inflammatory and antioxidant effects. The aim of this study was to investigate the effect and mechanism of AVC on POCD in aged rats to clarify the effect of AVC on POCD in aged rats. The aging rat model was established by continuous 200 mg/kg propofol anesthesia. Repeated propofol anesthesia could severely impair spatial learning ability, memory and cognitive function, and could promote hippocampal apoptosis, oxidative stress injury, neuroinflammation and ferroptosis in aging rats. In addition, AVC not only improved cognitive dysfunction, but also significantly inhibited apoptosis, neuroinflammatory response, ferroptosis and oxidative stress level in the hippocampus of aging rats induced by repeated anesthesia. Further mechanistic studies manifested that the above protective effects of AVC on aging rats induced by repeated propofol anesthesia may be achieved by activating Nrf2/ARE pathway activity. AVC pretreatment has a preventive effect on cognitive dysfunction induced by repeated propofol anesthesia in aging rats, and the preventive effect of AVC may be realized by activating the Nrf2/ARE signaling pathway activity. Our results demonstrate that AVC preconditioning reduces postoperative neuronal loss and neuroinflammation, activates the Nrf2/ARE pathway, reduces oxidative stress injury, and improves POCD in aged rats.
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PubMed
高影响因子
ChemPlusChem
·
2022
·Vol. 87
·期 10
·e202200312
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IF 3.21
Yujun Wang,Rongxiu Tu,Chuantao Hou,Zonghua Wang
Graphical A porous Fe−N−C aerogel catalyst was synthesized by pyrolysis of porous metal-organic aerogels. The Fe−N−C aerogel shows enhanced catalytic performance for oxygen reduction reaction (ORR) under alkaline condition. The markedly enhanced ORR performance for Fe−N−C aerogel can be assigned to the synergistic catalytic effect between Fe−N catalytic sites and graphitized carbon and excellent mass transport due to the unique hierarchically porous architecture. Synthesis of Fe−N−C electrocatalysts by pyrolysis of porous materials has been shown to be a promising pathway for the oxygen reduction reaction (ORR). Metal-organic aerogels (MOAs) with unique micropores and mesopores should provide an excellent precursor for Fe−N−C electrocatalysts. This work reports a Fe−N−C aerogel synthesized by pyrolysis of MOA. The Fe−N−C aerogel shows excellent ORR performance in alkaline condition with an onset potential of 0.96 V (vs. RHE) and a limiting current density of 5.02 mA cm −2 . The markedly enhanced ORR performance for Fe−N−C aerogel can be assigned to the synergistic catalytic effect between Fe−N catalytic sites and graphitized carbon and excellent mass transport due to the unique hierarchically porous architecture. In addition, satisfactory durability and methanol tolerance were obtained, demonstrating a promising material for ORR.
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Haiping Zhao,Ziyi Zhang,Yong Han,Weixia Yang,Wenzhi Tang,Tianli Yue,Zhonghong Li
A nanocomposite (UiO-66/Ce-MnO 2 ) was fabricated by combining UiO-66 with cerium-doped manganese dioxide (Ce-MnO 2 ) for colorimetric detecting vitamin C (Vc). Compared with traditional artificial enzymes, the as-synthesized UiO-66/Ce-MnO 2 were simple to prepare and did not require the participation of other active substances. The doping of cerium increased the oxygen vacancies and the UiO-66 as a carrier improved the dispersibility. The formation of superoxide anion (O 2 − ) and the inside Ce 4+ /Ce 3+ and Mn 4+ /Mn 3+ redox couples of UiO-66/Ce-MnO 2 endowed UiO-66/Ce-MnO 2 with a high catalytic capability, which could catalytically oxidize 3, 3′, 5, 5′-tetramethylbenzidine (TMB) into oxidation state TMB (oxTMB) without H 2 O 2 , accompanying with color change and a prominent peak at 652 nm in UV–vis spectra. Based on the inhibitory effects of Vc on catalytic oxidation of TMB, detection of Vc can be achieved, exhibiting a linear relationship in the concentration of 1.13–17.01 μmol L −1 with a low detection limit of 65.82 nmol L −1 . This system can also be detected by smartphone, the linear detection range is 12.47–22.67 μmol L −1 . Vc contents in fruits and vegetables detected by the sensor were in good agreement with the 2, 4-Dinitrophenylhydrazine colorimetry method ( P > 0.05), indicating a reliable sensor for Vc detection.
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PubMed
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 8
·期 1
·64-76
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IF 5.2
Haosheng Xin,Haiyong Wang,Xiaohong Hu,Xiuzheng Zhuang,Long Yan,Chenguang Wang,Longlong Ma,Qiying Liu
Cellulose hydrolysis and further conversion to diketones and alcohols was performed with graphene layer encapsulated cobalt catalysts (Co@C) in phosphoric acid aqueous solution. A total of 60.5% yield of the products mainly including ethanol, 2,5-hexanedione (2,5-HD) and diols could be achieved in 0.06 M H3PO4 solution. A series of characterization methods such as XRD, XPS, TEM, TG-MS, BET, ICP, H2-TPD, NH3-TPD, and Raman were carried out to explore the catalyst formation mechanism and reaction activity. The results of the analysis indicated that the calcination temperature had a deep influence on the structure formation of the Co@C catalysts, thus leading to differences in the reaction activity. While the calcination temperature was determined at 700 °C, the Co@C catalyst meets with the requirements of optimal reaction activity, appropriate particle size, suitable surface area, and pore size. Besides, it was found that H3PO4 is not only favorable in cellulose hydrolysis but also cooperates with the Co@C catalyst in the hydrogenolysis of C–O bond and C–C bonds for the formation of products. This work provides a possible way for renewable cellulose conversion to diketone and alcohols over encapsulated non-noble metal catalyst combined with phosphoric acid aqueous solution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hongxia Chen,Yutian Yang,Rihuang Nie,Cheng Li,Shuangwu Xu,Mengcheng Zhou,Xinyu Zhang,Hongming Zhou
Na 3 V 2 (PO 4 ) 3 has been widely studied due to its stable three-dimensional transmission channel structure as a cathode electrode of sodium ion batteries , but its micro particle size and low intrinsic electronic conductivity limit its further development. Therefore, hierarchical porous micro-nano NVP/C materials were successfully prepared using a metal-organic frameworks (MOFs) precursor. Because of the unique hierarchical porous micro-nano structure, 3D highly conductive network between surface and particles, and high specific surface area, M-NVP/C exhibits outstanding rate capability (95.0 mAh g −1 at a current density of 10 C) and extraordinary stable cycle life (the capacity decays from 111.2 mAh g −1 to 108.8 mAh g −1 after 500 cycles at 1 C, with a capacity retention rate of 97.8 %). This method provides a promising pathway for the application of MOFs in battery materials and promotes the development of SIBs in large-scale energy storage systems.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Zhaofei Wang,Xuemin Zhang,Wansheng Yao,Yong Dong,Baiyao Zhang,Xiaoyu Dong,Huagao Fang,Guobing Zhang,Yunsheng Ding
Thermosetting waterborne polyurethanes (WPUs) have received wide attention because of their excellent chemical resistance, mechanical properties, and low water absorption. However, their permanent network structure hinders their reprocessing applications, making it vital to prepare reprocessable thermosetting WPUs to minimize plastic pollution. Herein, for the first time, the cross-linked WPUs with excellent reprocessability were designed and synthesized by introducing covalent adaptable networks (CANs) in the form of quaternary ammonium alkyl chains. Our methodology combined CO2-triggered WPUs (CO2-triggered WPUs) with 1,6-diiodohexane. After the CO2 evaporated during film formation, the CO2-triggered WPUs left tertiary amine groups as reaction precursors, which could cross-link into a WPU CAN with 1,6-diiodohexane. All cross-linked WPUs possessed classic vitrimer performance including stress relaxation and malleability, as confirmed by stress-relaxation and hot-press tests. The results showed that cross-linked WPUs had excellent reprocessability and high mechanical properties, and the recovery ratios of the mechanical properties for the recycled samples were over 80% and the tensile strength was more than 17 MPa. More importantly, the cross-linked WPUs’ antibacterial rates of Staphylococcus aureus and Escherichia coli were 94.3 and 89.5%, respectively. This research offers a new method to synthesize high-performance WPUs via facile quaternary ammonium reversible cross-linking and demonstrates that WPU CANs have great potential as sustainable materials.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Zhiwen Gan,Tian Zhang,Xuanxuan An,Qin Tan,Shujun Zhen,Xiaoli Hu
Numerous ratiometric fluorescence nanozyme sensors are developed, though, fluorescence-scattering ratiometric sensors based on nanozymes are hardly reported. First-order scattering (FOS) could be quenched due to inner filter effect of quenchers on scattering signals. Meanwhile, Second-order scattering (SOS) depended on FOS. Based on the principle, we designed a novel nanozyme sensor by coupling fluorescence (FL) and SOS. Specifically, Fe-N-C nanozyme (Fe-HCNP) was fabricated by doping Fe into carbon-nitrogen polymers via formamide condensations . Fe-HCNP possessed robust oxidase-like activity, effectively transforming O 2 into ·O 2 - and ·OH. Then, Fe-HCNP and o-phenylenediamine (OPD) severed as a hybrid system to construct an FL-SOS ratiometric sensor for ascorbic acid (AA). Fe-HCNP with large size possessed strong SOS. After being added into the Fe-HCNP/OPD system, AA could fast be oxidized to dehydroascorbic acid (DAA) due to Fe-HCNP as oxidase mimics. Subsequently, fluorescent quinoxaline derivative (DFQ) was produced after condensation reactions between DAA and OPD, causing an increase in fluorescence. Meanwhile, the intensity of FOS was reduced because FOS peaks of Fe-HCNP overlapped absorption bands of DFQ, causing a decrease in SOS. The FL-SOS ratiometric sensor for AA showed outstanding advantages of high specificity and fast. Overall, this work provided a new strategy for nanozyme ratiometric sensors.
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