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Fe_(3)C@C/C for catalytic ozonation of silicon-containing wastewater:Dual improvement of silicon resistance and catalytic effect

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Journal of Materials Science & Technology 2023年第5期136卷 65-77页

作者： Shengzhe Wang Lei Ma Rui Wang Chengyu Jin Ying Zhao Xuefei Tan Yanan Zhang Mengyang Liu Chenxing Yao Huangzhao Wei Chenglin Sun Dalian institute of Chemical Physics Chinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology/College of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China College of Materials and Chemical Engineering Heilongjiang Institute of TechnologyHarbin 150050China School of light Industry and Chemical Engineering Dalian Polytechnic UniversityDalian 116034China

The improvement of catalysts’stability under harsh reaction conditions is vital for their practical ***,iron carbide(Fe_(3)C)nanoparticles were encapsulated in graphitic carbon in situ and a carbon ball served as the *** synthesized Fe_(3)C@C/C was first utilized to treat an m-cresol wastewater containing Si via catalytic *** with the commercial Fe/Al_(2)O_(3)catalyst,the resistance to Si of the Fe_(3)C@C/C was improved 22.68 times,while the TOC removal rate increased by a factor of 2.9,and it remained stable during 10 cycles and 12000 min of continuous reaction,which further demon-strated its potential for diverse *** catalyst exhibits improved resistance to Si because of the dual protection from the carbon-encapsulated structure and carbon *** functional theory calculations show that the encapsulation of Fe_(3)C using carbon significantly increases the resistance to adsorption of Si on its active *** addition,the activation of O_(3)is unimpeded on the Fe_(3)C adsorption sites by the protection from C,thus the generation of reactive oxygen species(ROS)by ozone is largely *** mechanism associated with the resistance of the Fe_(3)C@C/C catalyst to Si and its elevated activity are also elucidated.

关键词： Catalytic ozonation Silicon-resistant catalyst Carbon-encapsulated Fe_(3)C@C/C Density functional theory

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SYNTHESIS OF A NOVEL SELF-ASSEMBLING NLO POLYMERIC FILM

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Chinese Journal of Polymer Science 1999年第5期17卷 417-422页

作者：张榕本 Polymer Chemistry Laboratory Chinese Academy of Sciences and Chia Petrochemical Corporation institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

By covalently binding chromophore NPP, N-(4-nitrophenyl)-(L)-prolinol, to a structurally controlled cage-like cross-linking polymer (SCCP), a modified nonlinear optical (NLO) polymeric film prepared by 'in situ poling and sol-gel' process successfully overcame the fundamental problem of NPP chromophores subliming out from the cages of the 'doped'' NLO polymeric film when heated or placed under UV light. Its d(33) (coefficient of second harmonic generation) is 2.0 X 10(-8) esu. measured by IR dichroism. The modified film has a low decay of the SHG signal and preserves 94% of the initial value after 50 days at room temperature These properties match that of the 'doped' film, indicating that the modified film also retains the main advantages of the 'doped' film.

关键词： self-assembling orientation covalently linked sol-gel process

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Effect of Steam Treatment on the Catalytic Performance of ZSM-5 in the Co-conversion of Methanol and n-Hexane to Aromatics

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China Petroleum Processing & petrochemical Technology 2024年第3期26卷 73-81页

作者： Wei Shumei Xu Yarong Yang Fan Zhu Kake Zhu Xuedong State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China research institute of Urumqi petrochemical Company PetrochinaUrumqi 830019China

Steam pretreatment is a widely used method for modifying the acidity and structure of zeolites,thereby enhancing their catalytic *** study systematically investigated the effects of steam treatment on ZSM-5 zeolites at varying treatment temperatures and *** structural evolution of the catalysts was monitored using N2 adsorptiondesorption,X-ray diffraction,inductively coupled plasma optical emission spectroscopy,scanning electron microscopy,NH3 temperature-programmed desorption,in situ pyridine infrared spectroscopy,and thermogravimetric *** characterization results revealed that mesopores were introduced into the ZSM-5 zeolite catalysts through dealumination induced using steam treatment at moderate temperatures(400 and 500℃).Moreover,compared with the parent catalyst,the steam-treated catalysts exhibited a lower amount of acid sites and relative crystallinity,while the n(Si)/n(Al)ratio *** the co-conversion of methanol and n-hexane in a fixed bed reactor at 400℃and 0.5 MPa(N2 atmosphere),with a weight hourly space velocity of 1 h−1 and a stoichiometric ratio of 1:1(CH3OH to n-hexane),the steam-treated catalysts displayed a prolonged catalyst ***,the parent zeolite had a lifetime of 96 h,while the catalyst treated at 500℃for 12 h had a lifetime of up to 240 ***,the steam-treated catalysts maintained stable n-hexane conversion and improved aromatic ***,these treated catalysts exhibited a lower deactivation rate than the parent catalyst,and would be conducive to industrial scale-up production.

关键词： steam ZSM-5 zeolites co-conversion aromatization methanol n-hexane

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Applications of metal–organic frameworks for green energy and environment: New advances in adsorptive gas separation, storage and removal

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green Energy & Environment 2018年第3期3卷 191-228页

作者： Bin Wang Lin-Hua Xie Xiaoqing Wang Xiao-Min Liu Jinping Li Jian-Rong Li Beijing Key Laboratory for green Catalysis and Separation and Department of Chemistry and Chemical Engineering College of Environmental and Energy EngineeringBeijing University of Technology research institute of Special Chemicals Taiyuan University of Technology

The separation of gas molecules with similar physicochemical properties is of high importance but practically entails a substantial energy penalty in chemical industry. Meanwhile, clean energy gases such as H_2 and CH_4 are considered as promising candidates for the replacement of traditional fossil fuels. However, the technologies for the storage of these gases are still immature. In addition, the release of anthropogenic toxic gases into the atmosphere is a worldwide threat of growing concern. Both in academia and industry, considerable research efforts have been devoted to developing advanced porous materials for the effective and energy-efficient separation, storage, or capture of the related gases. In contrast to conventional inorganic porous materials such as zeolites and activated carbons, metal–organic frameworks(MOFs) are considered as a type of promising materials for gas separation and storage. In this contribution, we review the recent research advance of MOFs in some relevant applications, including CO_2 capture, O_2 purification, separation of light hydrocarbons, separation of noble gases, storage of gases(CH_4,H_2, and C_2 H_2) for energy, and removal of some gaseous air pollutants(NH_3, NO_2, and SO_2). Finally, an outlook regarding the challenges of the future research of MOFs in these directions is given.

关键词： Metal–organic frameworks Gas separation and storage light hydrocarbon Harmful gas Air purification

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Ni_(x)Co_(1-x)S as an effective noble metal-free cocatalyst for enhanced photocatalytic activity of g-C_(3)N_(4)

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Journal of Materials Science & Technology 2020年第21期56卷 227-235页

作者： Yuting Gao Feng Chen Zhe Chen Hongfei Shi School of Material Science and Technology Jilin Institute of Chemical TechnologyJilin132022China Jinlin petrochemical Company Organic Synthetic Plants Jinlin132021China

Solar photocatalysis,as a method of green energy production and sustainable technology,has been regarded as one of the most effective strategies to resolve environmental issues and the current energy *** this work,intimate contact hollow Ni_(x)Co_(1-x)S polyhedron/g-C3N4 nanosheet composites were prepared in-situ through a facile one-step hydrothermal *** as-prepared Ni_(x)Co_(1-x)S/g-C_(3)N_(4) composites showed superior photocatalytic activity and high stability for H2 generation and methyl orange(MO)degradation under visible light *** optimized 4 wt.%Ni_(x)Co_(1-x)S/g-C_(3)N_(4) composite attained a maximum H2 evolution rate of 1420μmol g^–1 h^–1,which was about 157 times higher than that of pure *** addition,the Ni_(x)Co_(1-x)S/g-C_(3)N_(4) composite also exhibited greatly improved photocatalytic activity for dye degradation,which for MO was at 98.14%in 9 *** outstanding photocatalytic performance was predominantly attributed to the unique architecture of hollow Ni_(x)Co_(1-x)S polyhedrons,which not only provided more active sites at the edges and surface as convenient charge transfer channels,but also promoted the separation and transport of electron-hole *** work provides some novel ideas for the design and development of highly efficient noble metal-free cocatalyst/semiconductor systems for photocatalytic H2 generation and dye degradation.

关键词： Non-noble metal cocatalyst Ni_(x)Co_(1-x)S g-C_(3)N_(4) Photocatalytic hydrogen production Dye degradation

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High value-added fluorescence upconversion agents-assisted nanosemiconductors for efficient wide spectral response photocatalysis:Exerting energy transfer effect and applications

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Journal of Rare Earths 2021年第3期39卷 243-260,I0001页

作者： Kailian Zhang Man Zhou Changlin Yu Xiaoxiao Li Kai Yang Shi Yang Wenxin Dai Weiya Huang Qizhe Fan Lihua Zhu School of Chemistry and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Pharmaceutical Sciences Gannan Medical UniversityGanzhou 341000China School of Chemical Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China Key Laboratory of green Energy and Environment Catalysis(Ningde Normal University) Fujian Province UniversityNingde 352100China research institute of Photocatalysis State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou 350002China

The design of the photocatalytic materials has made a great of remarkable progress in the area of the enhancement photocatalytic activity,but there are still lots of problems such as wide band gap,low utilization of sunlight,low quantum efficiency and poor stability,which further limit the extensive practical ***,it is a hot research topic and key scientific problem to be solved that how to design and prepare the catalysts,which can respond to visible and near-infrared light in *** by efficient nonlinear optical upconversion materials,upconversion-based nanocomposites can indirectly broaden the absorption ranges of semiconductors by co nverting the captured long-band visible and near-infrared incident light into high-energy short-band visible or ultraviolet light,which can be adopted as the promising candidate in wide-spectral-light-activating photocatalytic materials coupling with conventional *** to our recent works and literature reports,recent review summarizes the research progress of photocatalytic materials with upconversion effect on photolysis of water for hydrogen production,degradation of organic and inorganic pollutants,reduction of CO_(2) and photodynamic *** prepared nanocomposites can suppress the recombination of electrons and holes,and greatly improve the photocatalytic efficiency by the synergistic *** maybe stimulates a great interest in rational design and preparation of efficient full-spectrum photocatalytic systems and their wide application in solar energy conversion.

关键词： Fluorescence upconversion Hydrogen production Photocatalysis Treatment of pollutants Photodynamic therapy Rare earths

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Low group velocity in a photonic crystal coupled-cavity waveguide

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Chinese Physics B 2012年第4期21卷 357-363页

作者：张昌莘许兴胜 State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083China Department of Physics Guangdong University of Petrochemical Maoming 525000 China

A two-dimensional photonic crystal coupled-cavity waveguide is designed and optimized, the transmission spectrum is calculated by using the finite-difference time-domain method, and the group velocity of c/1856 is obtained. To our knowledge, this value of group velocity is the lowest group velocity in a photonic crystal waveguide calculated from its transmission spectrum so far. The result is confirmed by the photonic band structure calculated by using the plane wave expansion method, and it is found that the photonic crystal waveguide modes in a photonic band structure are in accordance with those in the transmission spectrum by using the finite-difference time-domain method. The mechanism of slow light in the coupled-cavity waveguide of photonic crystal is analysed.

关键词： photonic crystal wavguide coupled cavity slow light

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Genesis of Marine Carbonate Natural Gas in the Northeastern Sichuan Basin,China

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Acta Geologica Sinica(English Edition) 2008年第3期82卷 577-584页

作者： ZHANG Qu TENGER MENG Qingqiang QIN Jianzhong JIANG Qigui ZHENG Lunju institute of Petroleum Geology Petroleum Exploration and Production Research Institute Sinopec Wuxi Jiangsu 214151 China State Key Laboratory for Petroleum Resource and Prospecting Beijing 102249 China Key Laboratory of Minister for hydrocarbon Accumulation Mechanism in China University of Petroleum Ministry of Education Beijing 102249 China Basin and Reservoir research Center China University of Petroleum Beijing 102249 China

Sichuan Basin is one of the structurally stable and gas-rich basins, being regarded as one of China＇s important natural gas industry bases. Puguang and Jiannan gas fields, located in the eastern Sichuan Basin are two large fields with gas derived from Permian and Lower Triassic marine carbonate. The genesis of marine carbonate natural gas was examined using carbon isotope composition and hydrocarbon components of natural gas samples from the eastern and western Sichuan Basin, and compared with that of acidolysis gas derived from marine source rock in the eastern Sichuan Basin. It is concluded that the natural gas in the marine carbonate reservoir originated from pyrolysis of the earlier crude oil and light-oil, and then mixed with kerogen pyrolysis gas of the Permian and Lower Silurian source rock.

关键词： Sichuan Basin natural gas carbon isotope acidolysis gas genesis

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Optimal design of the zeolite exhibiting CHA topology for the MTO conversion from first-principles

Optimal design of the zeolite exhibiting CHA topology for th...

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第十六届全国分子筛大会

作者： Chuanming Wang Yangdong Wang Hongxing Liu Zaiku Xie Shanghai research institute of petrochemical Technology SINOPEC

＜正＞In order to improve the performance of the methanol-to-olefins（MTO）conversion,the catalyticactivity and selectivity of polymethylbenzenes encapsulated in CHA zeolite with different compositions has been investigated from first principles based on the hydrocarbon pool *** is shown that divalent ions substituted CHA zeolite is more active than tetravalent substituted CHA zeolite in the MTO conversion.

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Constructing the Al deficiency in Si-O(H)-Al units based on Pt/ZSM-5 for enhanced hydrocracking of polyethylene into high-quality liquid fuel

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Nano research 2024年第11期17卷 10088-10098页

作者： Xia Zhong Jie Liu Li Gao Junnan Chen Xiyang Wang Ying Zhang Yimin A. Wu Mozaffar Shakeri Xia Zhang Bingsen Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China Department of Chemistry College of Science Northeastern University Shenyang 110819 China Department of Mechanical and Mechatronics Engineering Waterloo Institute for Nanotechnology University of Waterloo Waterloo Ontario N2L 3G1 Canada School of petrochemical Engineering Liaoning Petrochemical University Fushun 113001 China Laboratory of Heterogeneous Catalysis Department of Chemical and Petroleum Engineering Chemistry and Chemical Engineering Research Center of Iran Tehran 16363 Iran

Hydrocracking catalysis is a controllable route to plastic waste upgrading. However, the mismatched acid site-driven C-C cleavage and C=C hydrogenation process on metal restrict the efficiency and selectivity in conventional metal/acid bi-functional catalyst. Herein, we introduce Al deficiency in Si-O(H)-Al structural units of Pt/zeolite socony mobil-5 (Pt/ZSM-5) through discharge driven reduction (DR) process to precisely control the ratio of metal to acid, achieving hydrocracking of low-density polyethylene (LDPE) waste at 270 °C with 87.7% conversion and liquid fuel (C5-C21) selectivity of 77.8%. Pair distribution function (PDF) and nuclear magnetic resonance (NMR) spectroscopy demonstrate the partial absent Al sites further resulting short-range local disorder Si-O(H)-Al. Upon pyridine infrared spectroscopy (Py-IR) and CO diffuse reflectance Fourier-transform infrared (CO DRIFT) analysis, the extraction of Al modulates Brønsted acid density of Pt/ZSM-5 with DR process (Pt/Z5DR), improves the interaction between Pt and ZSM-5 support, enhances the cationic of Pt. The metal-acid balance and electron-deficient Pt favor the matching speed of light olefins hydrogenation and the cracking of macromolecule intermediates. Moreover, density functional theory (DFT) calculations identify the thermodynamic stability of Pt/Z5DR and moderate adsorption capability towards light olefins. This work confirms the great potential of precisely controlled molar of metal to acid in metal/zeolite catalysts for LDPE upcycling, providing a viable path for dealing with PE plastic wastes.

关键词： plastic upcycling hydrocracking low-density polyethylene liquid fuel Pt zeolites

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