Materials Today Nano
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2022
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IF 13.364
H. Wang,Y. Liu,H. Wang,J. Song,D. Ma,Z. Dai
Efficient utilization of hydrocarbon fuels holds great significance for the current vehicle low-emission requirements and future carbon-neutral society. However, the scenario that limits the effective fuel use and combustion is the present undesirable hydrocarbon-cracking catalysts of low activity, serious coking, and easy degradation. To tackle these issues, we rationally designed and synthesized an active, anti-coking, and recyclable all-in-one zeolite@Ru–Al 2 O 3 catalyst on FeCrAl support by steam-assisted crystallization and atomic layer deposition . Ru nanoclusters dispersedly on ZSM-5 can boost the catalytic efficiency for hydrocarbon cracking and anti-coking, while the protective Al 2 O 3 thin layers further ensure the reusable economy. As for n-dodecane (C 12 H 26 ) cracking reaction, the ZSM-5@Ru–Al 2 O 3 showed a high unit activity up to 0.1253%·ml·mg −1 ·min −1 , low-carbon deposition rate, and the enhanced first-cycle carbon removal rate of 78.3% for recyclable use. Density functional theory (DFT) calculations have further confirmed that high catalytic efficiency and low-carbon deposition benefit from the timely adsorption of C 12 H 26 and timely transfer of reactant products at the composite interface. This work opens interesting possibilities for the rational design and fabrication of high-efficient, anti-coking, and recyclable hydrocarbon cracking catalysts through multifunctional structural regulations.
研究领域:
催化化学
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材料科学
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能源工程
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 71
·40989-40995
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IF 2.936
Ruifeng Wang,Lungang Chen,Xinghua Zhang,Qi Zhang,Yuping Li,Chenguang Wang,Longlong Ma
Novel catalytic material with high catalytic activity and hydrothermal stability plays a key role in the efficient conversion of levulinic acid (LA) to γ-valerolactone (GVL) in water. In this study, mixed oxides Al2O3–TiO2, Al2O3–MoO3 and Al2O3–Co3O4 were synthesized by co-precipitation using aqueous solution of NaOH as precipitant. Ru catalysts supported on mixed oxides were prepared by impregnation method and their catalytic performances were tested in the hydrogenation of LA to GVL on a fixed bed reactor. The physicochemical properties of the catalysts were characterized by XRD, H2-TPR, NH3-TPD, and BET techniques. The TiO2 component significantly affected the acidity of the catalyst, and thus its catalytic activity for the GVL yield was affected. The desired product GVL with a yield of about 97% was obtained over the Ru/Al2O3–TiO2 catalyst under mild conditions (WHSV = 1.8 h−1, T = 80 °C). Moreover, the catalyst Ru/Al2O3–TiO2 exhibited excellent thermal stability in the test period of time.
研究领域:
催化
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化学工程
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材料科学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Liyan Zhang,Yinze Yang,Leilei Zhou,Fengyu Zhao,Haiyang Cheng
The synthesis of 1,6–hexamethylenediamine via the reductive amination of 1,6–hexanediol is a fascinating green process and a challenging topic. We developed a kind of Ru/PRL(x)–Al 2 O 3 catalyst for the reductive amination of 1,6–hexanediol, the active Ru species was highly dispersed and anchored by the CN x species formed from 1,10-phenanthroline (PRL). The Ru particle dispersion, electronic interaction, and acid–basic property as well as the catalytic mechanism and the rate determining step were discussed in detail. The new and more acid–base pairs formed, and the electron deficient Ru species and smaller nanoparticles are responsible for the improved catalytic performances of Ru/PRL–Al 2 O 3 catalyst. The yield of 1,6–hexamethylenediamine could reach to 54%, which is the best results reported up to now. The present catalytic process is of great potential for industrial application as it is a green process compared to the traditional method for 1,6–hexamethylenediamine production.
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Science China-Chemistry
·
2017
·Vol. 60
·期 7
·920-926
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IF 4.132
Li Yan,Cheng Haiyang,Zhang Chao,Zhang Bin,Liu Tong,Wu Qifan,Su Xinluona,Lin Weiwei,Zhao Fengyu
Hexamethylenediamine (HMDA) is an important reagent for the synthesis of Nylon-6,6, and it is usually produced by the hydrogenation of adiponitrile using a toxic reagent of hydrocyanic acid. Herein, we developed an environmental friendly route to produce HMDA via catalytic reductive amination of 1,6-hexanediol (HDO) in the presence of hydrogen. The activities of several heterogeneous metal catalysts such as supported Ni, Co, Ru, Pt, Pd catalysts were screened for the present reaction in supercritical ammonia without any additives. Among the catalysts examined, Ru/Al 2 O 3 presented a high catalytic activity and highest selectivity for the desired product of HMDA. The high performance of Ru/Al 2 O 3 was discussed based on the Ru dispersion and the surface properties like the acid-basicity. In addition, the reaction parameters such as reaction temperature, time, H 2 and NH 3 pressure were examined, and the reaction processes were discussed in detail.
研究领域:
化学工程
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环境科学
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高影响因子
Catalysts
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2024
·Vol. 14
·期 11
·827
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IF 3.8
Yumeng Song,Ping Chen,Hui Lou,Xiaoming Zheng,Xiangen Song
In this work, the highly efficient hydrogenation of guaiacol catalyzed by ruthenium supported on Al2O3-TiO2(Ru/Al2Ti1) at very mild conditions was carried out. At temperatures as low as 25 °C and 2 MPa H2, about 60% of guaiacol could be converted to 2-methoxycyclohexanol (MCH) with a selectivity as high as 94% on the Ru/Al2Ti1catalyst with an appropriate hydrogen pressure. At temperatures above 50 °C, almost all of the guaiacol could be converted with the catalyst of Ru/Al2Ti1, mainly into hydrogenated products such as MCH. The surprisingly efficient hydrogenation of guaiacol at low temperatures was most likely due to the ability of Ru particles loaded on the specific complex metal oxide carriers, particularly the reduction of the edge effect of Ru, to activate phenyl and hydrogen and reduce the competition of the dimethoxy process. These findings about the high activity of the Ru/Al2Ti1catalyst at nearly room temperature may be helpful to upgrading the industrial process of the pyrolysis bio-oils.
研究领域:
催化化学
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可再生能源
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工业化学
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高影响因子
APPLIED CATALYSIS A-GENERAL
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2026
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IF 4.8
Yu Han,Yu-Wei Xiang,Zhi-Rong Fu,Xin Zhang,Jia-Yi Zhou,Xiang-Sen Wu,Yong Luo
The 8H-NEC was synthesized by different organic routes and used as the substrate for kinetic studies. • Ru/Al 2 O 3 catalysts with controllable Ru particle sizes were prepared. • Smaller Ru particles showed higher TOF and lower apparent activation energy. • Low-coordinated Ru line-edge sites enhanced 8H-NEC adsorption. N -ethylcarbazole (NEC) is a promising liquid organic hydrogen carrier (LOHC) for hydrogen storage, and Ru/Al 2 O 3 catalyst is one of the most widely used catalysts for NEC hydrogenation. However, previous studies have primarily focused on the chemical electronic effect of Ru/Al 2 O 3 catalyst, while neglecting the influence of geometric structure. In this work, Ru particle size effect on the rate-determining step of 8H- N -ethylcarbazole (8H-NEC) hydrogenation has been considered. Firstly, a series of Ru/Al 2 O 3 catalysts with controllable Ru particle sizes were prepared. After that, 8H-NEC was synthesized by different organic routes to serve as the substrate for catalytic and kinetic experiments. Results showed that as the Ru particle size increased from 1.4 to 5.3 nm, the turnover frequency (TOF) decreased from 59.7 to 32.2 min −1 and the apparent activation energy increased from 44.55 to 74.00 kJ·mol −1 . CO probe diffuse reflection infrared Fourier transform spectrum (CO-DRIFTS) and density functional theory (DFT) results demonstrated that superior catalytic performance of smaller Ru particles was associated with the exposure of more low-coordinated line-edge sites, which exhibited stronger adsorption toward 8H-NEC. This study offers new insights into the design of highly efficient catalysts of NEC hydrogenation. Download: Download high-res image (169KB) Download: Download full-size image
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高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Peng Gao,Min Zheng,Mengni Zhou,Yiwei Ma,Guirong Bao,Chengyan Wang
The valorization and toxicity reduction of phenolic substances are critical challenges for achieving green and sustainable development in the petroleum, coal, and biomass industries. This study investigated the phenolic model compound guaiacol hydrodeoxygenation over Ru/Al 2 O 3 catalysts, demonstrating that synthesis within an anaerobic glovebox significantly enhances catalytic activity compared to ambient synthesis. Four solvents (ethanol, methanol, tetrahydrofuran, and n-dodecane) were evaluated for their impact on guaiacol conversion and product distribution. Experimental results demonstrated that non-polar n-dodecane achieved 100 % guaiacol conversion and 92.8 % cyclohexane selectivity, attributed to weak catalyst-solvent interactions verified by first-principles calculations. Reaction optimization enabled > 90 % yields of 2-methoxycyclohexanol, cyclohexanol, and cyclohexane. Crucially, a novel low-temperature demethoxylation pathway via the intermediate 2-methoxy-1-cyclohexen-1-ol was identified through quantum chemistry calculations, offering a strategy to enhance cyclohexanol production. Kinetic analysis revealed apparent activation energies of 55 kJ/mol (demethoxylation) and 72 kJ/mol (dehydroxylation). The catalyst maintained stable performance over five cycles. These findings underscore the critical importance of catalyst synthesis, solvent environment, and reaction control in achieving efficient and selective guaiacol hydrodeoxygenation, offering strategies for green valorization and toxicity reduction of phenols.
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高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 9
·242
·
IF 2.5
Shi Guopu,Shi Fangxu,Liang Fuxin,Wei Yulin,Li Yuanguang,Han Yubing,Wu Junyan,Huang Sai,Wang Honglei,Ji Jun,Wu Chao
Ethyl 3-piperidine-carboxylate is an important intermediate in the pharmaceutical field. To break through the limitations of poor mechanical strength and thermal stability of catalysts and low catalytic efficiency of foam ceramic carriers due to the lack of active sites in traditional synthesis, this study used the hydrogenation synthesis of ethyl nicotinate to produce this intermediate as the probe reaction. Pd-Ni/Ru-Al 2 O 3 -SiO 2 foam ceramic catalysts were prepared by the sol-gel method and the impregnation method. Relying on the bimetallic differentiated synergistic effect of Ni, Ru, and Pd, the above technical bottlenecks were overcome. A variety of characterization techniques reveal its core mechanism of action: Pd serves as the catalytic core, and Ni can optimize the electronic structure, enabling the Pd-Ni alloy to obtain the optimal d-band center and adsorption energy, laying an electronic foundation for efficient catalysis. Ru can precisely control the particle size of Pd-Ru alloy, which is 4.5 nm smaller than that of single-metal Pd, significantly improving the metal dispersion and the utilization rate of active sites. The three-dimensional network structure of foam ceramics enhances mass transfer efficiency. The γ-Al 2 O 3 -SiO 2 coating provides abundant active sites and excellent stability. The catalytic performance of this system has been significantly enhanced. Among them, the yield of the corresponding product of the Pd-Ni bimetallic catalyst reached 92.57%, and it still remained above 80% after five cycles of use, providing new prospects for the green and efficient synthesis of ethyl 3-piperidine-carboxylic acid esters and the development of low-cost hydrogenation catalysts. Graphical
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高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2023
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IF 10.4
Liangyong Chen,Daocheng Liu,Guoqiang Wei
Integrated Capture and Methanation of CO 2 (ICCM) with H 2 produced from renewable energy is a novel Power-to-Gas technology. The combination of ICCM with CO 2 point source, such as coal-fired power plant, is anticipated, which greatly motivates the investigations into the influences of coal ash on the key performance of dual function material (DFM) used in ICCM process. Via the experimental study on the coal ash impacts, this work explored the adaptability of DFM and ICCM to coal-fired power plant. Na-Ru/Al 2 O 3 DFM and two ashes collected from the electrical precipitators of supercritical coal-fired power plants were used for experiments. It showed that fly ashes contaminated CO 2 adsorbents and active sites of DFMs, and caused successive drops in carbonates conversion and CH 4 selectivity upon cyclic ICCM reactions. The CO 2 -TPD and H 2 -TPSR tests revealed that the declined supply capability of hydrogen atoms by Ru sites, and the increased rate gap between CO formation and the following CO hydrogenation were responsible for the declined methanation ability of ash-contaminated DFMs. The roles of SiO 2 and Fe 2 O 3 phases in ashes were identified, indicating that SiO 2 reacted with adsorbent components and masked Ru sites, and then induced DFM deactivation by affecting the transport processes of key reactants; Fe 2 O 3 successively invaded both Ru sites and Na 2 CO 3 /γ-Al 2 O 3 interface, leading to successive losses in methanation ability and CO 2 desorption capacity with cyclic ICCM reactions.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Bo Feng,Yaxuan Jing,Xiaohui Liu,Yong Guo,Yanqin Wang
The upcycling of waste polyvinyl chloride (PVC) is a grand challenge because of the unmanageable Cl species. Here, we develop a Cl-transfer strategy to upcycle waste PVC into value-added organic chlorides and PE-like polymer with various Cl acceptors (tetrahydrofuran, dibutyl ether and butanol) over Ru/Al 2 O 3 catalyst. The high utilization efficiency of Cl (> 80 %) can be obtained over Ru/Al 2 O 3 at 180 °C, 2Mpa H 2 with tetrahydrofuran as an acceptor within tens of hours. The excellent performance is attributed to key features including Al 2 O 3 for the C-O bond activation and metal Ru for C-Cl bond activation and H 2 dissociation. The remaining PE-like polymer after removing Cl could be regarded as PE-like feedstock and further converted into methane through the same Ru/Al 2 O 3 catalyst. The Cl-transfer system also enables the upcycling of several common PVC-contained wastes and works well in the scale-up test. This work offers a catalytic path to integrate waste PVC plastic into the supply chain of organic chlorides under the context of circular economy.
研究领域:
化学工程
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材料科学
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环境科学
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催化
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 107
·105338-105346
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IF 3.289
Deyuan Xie,Ye Sun,Tianle Zhu,Xing Fan,Xiaowei Hong,Wenhao Yang
NH3 synthesis from H2O + N2, H2 + N2 or H2O + H2 + N2 by dielectric barrier discharge combined with an Ru/Al2O3 catalyst is studied at atmospheric pressure and room temperature. Additionally, the effects of reaction gas composition, energy density, and discharge frequency on NH3 yield and by-product formation are investigated. The results show that NH3 can be formed from reaction gases consisting of H2O and N2. The NH3 yield of the reaction gas containing H2 is much higher than that of the reaction gas consisting of H2O and N2. The presence of H2O has a promotion effect on NH3 synthesis from H2 and N2, especially for reaction gases with an H2 content less than 10%. The NH3 yield first increases and then decreases with an increase in the energy density. The maximum yield of 680 mg kW−1 h−1 occurs at the energy density of 1400 J L−1 and in the reaction gas of 0.14% H2O, 40% H2 and N2. The discharge frequency has a great effect on the NH3 yield, and maximum NH3 yield is obtained at the frequency of 13 kHz. Besides NH3, some by-products, such as N2O and NO2, are also formed with reaction gases containing H2O. However, their formation can be suppressed in the presence of H2, which is attributed to the reduction effect of H2 on the by-products.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
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2023
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IF 5.7
Bowen Luo,Zhengchen Zhu,Xuebin Liang,Zhipeng Tian,Riyang Shu,Chao Wang,Ying Chen,Jianping Liu
The property of metal site affects the catalyst activity significantly. Herein, the effect of metal site influenced by metal particle size on lignin hydrogenolysis was explored. Four different preparation methods were employed to obtain Ru/Al 2 O 3 catalysts with different Ru metal particle size. Ru/Al 2 O 3 -IM catalyst with 10.5 nm Ru particle size only had 16.9 wt% yield of aromatic monomer products. While, Ru/Al 2 O 3 –BH catalyst that possessed the metal particle size of 3.6 nm obtained the high monomer yield of 31.7 wt%, with the a low selectivity of methoxy-containing products. Small metal particle size enabled to enhance hydrogen absorption and activation ability, which provided more active hydrogen species and improved lignin hydrogenolysis performance. It can also expose more metal sites to contact with substrates and promote the demethoxylation reaction to achieve more phenols products. The ratio of phenols/guaiacols product kept a good linear relation with Ru particle size. Moreover, Ru/Al 2 O 3 –BH catalyst with a small Ru particle size had a high TOF of 0.57 mol guaiacol mol Ru −1 min −1 , which was much larger than that of the other Ru/Al 2 O 3 catalysts with a large Ru particle size.
研究领域:
催化
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化学工程
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材料科学
·
可再生能源
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DOI
高影响因子
危险品化学品经营许可证（带存储）