JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Wei Li,Shuang Wang,Jinping Li
A series of BaCeO 3 modified with different rare earth elements (La, Y, Pr) were synthesized by co-precipitation and calcination and the effect of rare earth elements for catalytic ammonia synthesis under mild conditions was studied. The ammonia synthesis performance tests show that 2.5% Ru/BaCe 0.9 La 0.1 O 3– δ catalyst (All the percentages of Ru in this article are in mass fraction) exhibits the highest ammonia synthesis rate (34 mmol/(g·h)) at 3 MPa, 450 °C, and no sign of deactivation after 100 h of reaction. H 2 -TPR and XPS analyses indicate that the introduction of La increases the amount of oxygen vacancies of the catalyst, which is beneficial to increasing the electron density of Ru surface. HRTEM analysis shows that the Ru particle size is reduced greatly after La is introduced, which facilitates the catalyst generating more B 5 -type sites (active sites of Ru species for N N dissociation). CO 2 -TPD analysis indicates that BaCe 0.9 La 0.1 O 3– δ has stronger basicity , which promotes electrons transfer from support to Ru. This work provides an effective method for design and synthesis of Ru-based multi-element composite perovskite oxide catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 11
·3370-3377
·
IF 8.506
Wenjing Yang,Haiyang Cheng,Bin Zhang,Yan Li,Tong Liu,Mingli Lan,Yancun Yu,Chao Zhang,Weiwei Lin,Shin-ichiro Fujita,Masahiko Arai,Fengyu Zhao
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) was studied with a homogeneous RuCl2(PPh3)3 catalyst in supercritical CO2 (scCO2). The conversion of LA was observed to increase with CO2 pressure and the possible reasons for this rate acceleration were discussed, including the molecular interactions of CO2 with the reacting and catalytic species as well as the acidity and phase behavior of the reaction mixture. The interaction between CO2 and RuCl2(PPh3)3 was significant, which resulted in the production of an active RuHCl(CO)(PPh3)3 complex and thus enhanced the rate of hydrogenation in the presence of CO2.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Shuang Ji,Zhourong Xiao,Haocui Zhang,Ling Li,Guozhu Li,Li Wang,Guozhu Liu
A high surface area (HSA) Ce 0.75 Zr 0.25 O 2 (CZ) support was synthesized by hydrothermal synthesis method with assistance of surfactant (cetyltrimethyl ammonium bromide , CTAB), and then 2.0 wt% Ru was impregnated on it to obtain a steam reforming catalyst for n-dodecane. The surface area of Ru/HSA-CZ catalyst is 107.6 m 2 g −1 , which is ca. three times higher than that prepared through the sol-gel (sg) method (34.3 m 2 g −1 , Ru/CZ-sg) and ca. 40% higher than that without CTAB (76.7 m 2 g −1 , Ru/CZ-wo). Catalytic steam reforming of n-dodecane, shows the completely conversion of n-dodecane over Ru/HSA-CZ and slightly drops about 6% (650 °C, LHSV = 12 mL/g h, S/C = 4, time on stream = 7 h) while 81% and 70% were observed for the Ru/CZ-wo and Ru/CZ-sg but with twice (or triple) deactivation rates. The possible reason for observed better performance of Ru/HSA-CZ should be attributed to the high metal dispersion of Ru over HSA-CZ, and the favorable Ru-support interaction as evidenced by H 2 -Temperature programmed reduction (H 2 -TPR), and high redox ability of high surface area Ce 0.75 Zr 0.25 O 2 support thanks to high Ce 3+ content. Further steam reforming of n-dodecane over Ru/HSA-CZ at higher LHSV (750 °C, LHSV = 36 mL/g h, S/C = 4) exhibits completed conversion and without significant deactivation.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
L. Lv,S. Wang,Z. Zhang,L. Wang,P. He
Supported Ru catalysts over TiO 2 with various crystal phases were prepared, which involved rutile, anatase, and their mixed phase. And their catalytic activities for CH 3 Br complete oxidation were investigated. Results showed Ru/TiO 2-700-4 that TiO 2-700-4 is sourced from anatase TiO 2 calcined at 700 °C for 4 h is the most active catalyst among these catalysts. The content of rutile phase on the surface is lower than the bulk. Strong metal support interaction occurs owing to lower lattice mismatch between RuO 2 and rutile TiO 2 . It was further verified by H 2 -temperature programmed reduction, ultraviolet-Raman and transmission electron microscopy . Especially mixed-phase TiO 2 is more conductive to higher dispersion of RuO 2 than pure phase TiO 2 , which is easier to form epitaxial growth . The catalytic activity for CH 3 Br complete oxidation was not in exact accord with the dispersion of Ru. It is possibly attributed to the combination of arguably favorable physico-chemical properties of more Ru active sites, electron transfer , and appropriate surface acidity. At the low reaction temperature, more Ru active sites are beneficial for the total oxidation of CH 3 Br. With the increase of temperature, higher activity is prone to strong surface acidity and electron transfer, as was confirmed by X-ray photoelectron spectra and NH 3 -temperature programmed desorption analysis.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 8
·2578-2588
·
IF 6.177
Leilei Zhou,Weiwei Lin,Xinchao Wang,Zhuangqing Wang,Yinze Yang,Liyan Zhang,Haiyang Cheng,Masahiko Arai,Fengyu Zhao
The production of biofuels (hydrocarbons) from renewable biomass resources has attracted much attention in the fields of green energy and sustainable chemistry. Herein, catalytic hydrodeoxygenation of methyl laurate (n-C11H23COOCH3) to produce hydrocarbons n-C12H26 and n-C11H24 has been investigated over Ru dispersed on acidic supports H-ZSM-5, Al2O3 and SiO2, and the reaction rate and the product distribution were discussed and correlated with surface Brønsted and Lewis acid sites and active Ru species in detail. The reaction rate at the initial stage increased with the amount of the total acid sites, and the ratio of n-C12H26/n-C11H24 and the selectivity to n-C12H26 were positively correlated with the amount of Brønsted acid sites. The Ru active species presented to be more electron-deficient on the catalysts with a larger amount of Brønsted acid sites on which an η1-(O) adsorption configuration of 1-C11H23CHO was confirmed, which favoured the formation of n-C12H26, thus varying the product distribution. Besides, Brønsted acid sites could provide protons to promote the hydrogenolysis of n-C11H23COOCH3 and the following dehydration to produce n-C12H26.
研究领域:
绿色能源
·
催化化学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Ru Jia,Xiaoxue Zhang,Li Gan,Muhammad Tahir,Zhen-Feng Huang,Lun Pan,Ruijie Gao,Chengxiang Shi,Xiangwen Zhang,Guidong Yang,Ji-Jun Zou
The nitrate reduction reaction (NO3RR) represents a promising route for water treatment and NH3 generation. This process involves the deoxygenation of NO3− to form nitrite (NO2−), followed by its subsequent hydrogenation. However, discrepancies in the rates of these two steps result in a decrease in faradaic efficiency (FE) and NH3 yield rate. Herein, we demonstrated a tandem catalyst of (Cu7/Ag3)7-Ru3/C achieving a high NH3 yield rate of 3.45 mmol h−1 cm−2 (2.30 mol gcat−1 h−1) and a FE of 93.48% at −0.9 V vs. the reversible hydrogen electrode. The Cu/Ag heterostructure greatly enhanced the conversion of NO3− to NO2− over a wide potential window due to the synergistic effect, while Ru, selectively adsorbing NO2−, provided active hydrogen derived from water hydrolysis to facilitate NH3 synthesis. Furthermore, (Cu7/Ag3)7-Ru3/C exhibited stable performance in a membrane electrode assembly over 60 hours, achieving an average NH3 yield rate of 6.90 mmol h−1. The ammonium chloride solid product was successfully obtained using an air stripping methodology. In situ characterization revealed that the surface microenvironment of Ru influenced the adsorption configuration of *NO and on-top adsorbed NO was more favorable for ammonia synthesis compared to bridge-adsorbed NO. The overall reaction pathway involved stepwise deoxygenation to form *N and subsequent gradual hydrogenation.
研究领域:
电催化
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Materials
·
2025
·Vol. 5
·期 8
·N
·
IF 11.2
Baoyu Wang,Ximing Yan,Ming Zhou,Hu Li
Lignin-based guaiacol and its derivatives can be hydrogenated to synthesize 2-methoxycyclohexanols (2-MCHs), widely used in the pharmaceutical industry, while the efficient catalytic conversion of guaiacols into 2-MCHs is challenging due to the interference of the side reaction of CAr-OCH3 bond cleavage. In this work, highly selective hydrogenation of various guaiacyl lignin-derived phenols to 2-MCHs (yields of 86%-97%) was realized over a single-atom Ru-based catalyst (Ru1/o-CeO2-ov) that preferentially exposes the CeO2(111) plane and has abundant oxygen vacancies. Control experiments and mechanism studies expounded that Ru-O-Ce is the active site for hydrogenation of aromatic ring in guaiacols, and the exposed (111) plane and abundant oxygen vacancies of ceria can reduce the activation energy of aromatic ring hydrogenation, thereby enabling guaiacols to generate the corresponding hydrogenated products with high selectivity. Response surface optimization experiments indicated that temperature and time have relatively more significant effects on the 2-MCH yield. Moreover, the Ru1/o-CeO2-ov catalyst exhibited excellent reusability, and was extensively applicable to the hydrogenative dearomatization of different types of lignin-derived phenols, providing a unique solution for upgrading biomass feedstock into specific structural chemicals.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Haijiao Jia,Xinyu Xu,Yuchen Cui,Mengqi Cheng,Guirong Borjihan,Xiao Zhang,Shengbo Yang,Youxin Li
A novel magnetic heterogeneous ruthenium catalyst (Fe 3 O 4 @SiO 2 -DTPA-Ru) was prepared by using magnetic silicon spheres as support, ethylenediaminepentaacetic acid (DTPA) as functional ligands, ruthenium chloride as catalyst precursor. The results obtained after a series of characterizations showed that the catalyst Fe 3 O 4 @SiO 2 -DTPA-Ru was 5–15 nm in size with a 0.205 nm lattice and contained 0.31 mmol Ru/g catalyst. It also had a good thermal stability under 232°C which was verified by thermal filtration method. Besides, the saturation magnetic intensity was as high as 20.54 emu/g. The catalyst Fe 3 O 4 @SiO 2 -DTPA-Ru was applied for the first time into thirteen oxidation reactions of aromatic alcohols and showed good catalytic activity even the yields of eleven aromatic alcohols were all over 90%. In catalyzing 1-phenylethanol to acetophenone, its TOF and TON were 9677 h −1 and 6991, respectively. The Fe 3 O 4 @SiO 2 -DTPA-Ru catalyst could still maintain good reusability and catalytic performance after 15 cycles of 1-phenylethanol oxidation, which was superior to many reported catalysts and had great potential in future industrial production.
研究领域:
化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Tongtong Zhang,Xibo Zhang,Fei Chang
The industrial production of ammonia predominantly relies on the well-established Haber-Bosch process, which operates under harsh conditions (350–500 °C and 15–35 MPa). This process consumes nearly 2% of the world’s energy production and is associated with significant carbon emissions. Consequently, there is an urgent need to develop efficient catalytic processes for ammonia synthesis that can operate at milder temperatures and pressures. In this work, we introduce a synergistic photothermal ammonia synthesis process using ruthenium (Ru) catalysts supported on defective titania (TiO2-x). A solid-state mechanical reduction method was employed to create oxygen vacancies in TiO2, resulting in the formation of TiO2-x. The Ru nanoparticles on TiO2-x with moderate oxygen vacancies exhibited high dispersion, with an average particle size of 2–3 nm. Owing to the plasmonic hybridization effect between TiO2-x and Ru nanoparticles, the Ru/TiO2–x system demonstrated full-spectrum solar-light absorption and enabled photothermal ammonia synthesis at low temperature (250 °C). This system achieved nearly a 300% enhancement in activity compared to that of traditional thermal catalytic processes. Kinetic studies revealed a decrease in apparent activation energy and reaction orders of N2 and NH3 upon solar illumination of Ru/TiO2–x, indicating its remarkable photothermal promotion of nitrogen activation and ammonia desorption. Our findings underscore the significance of the photothermal effect in activating inert nitrogen molecules and achieving ammonia synthesis under mild conditions, providing valuable insights into the design of future catalysts.
研究领域:
催化化学
·
材料科学
·
化学工程
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jie Wang,Liu Chen,Wen Liu,Chaozhang Huang,Daoquan Wang,Weiping Fang,Wenjing Song,Quanxing Zheng,Weikun Lai
High-value utilization of cellulosic biomass proves critical to advancing sustainable development and unlocking circular economy potential. This work reports a bifunctional zirconium phosphate (ZrP)-supported Ru catalyst (Ru/ZrP) for efficient cellulose-to-sugar alcohol conversion, delivering a 56.4% C6 sugar alcohol yield under reaction conditions of 200 °C and 3 MPa H2. The performance shows a 24-fold enhancement relative to Ru/ZrO2 (2.4% yield), with combined characterization and kinetic studies confirming that Brønsted–Lewis acid (P–OH/Zr4+) synergy governs the catalytic enhancement. Brønsted acid sites drive cellulose hydrolysis to glucose by accelerating β-1,4-glycosidic bond cleavage, while Lewis acid sites synergize with Ru sites to promote hydrogenation of glucose into sorbitol. Notably, the optimized Ru/ZrP1.4 catalyst also enabled effective disaccharide-to-sugar alcohol conversion, achieving a 54.3% C6 sugar alcohol yield using cellobiose as the substrate and maintaining stability over five cycles without any obvious deactivation. This work elucidates the critical roles of Brønsted–Lewis acid sites in mediating cellulose conversion, establishing a robust and efficient multifunctional Ru/ZrP catalyst for aqueous-phase biomass catalysis.
研究领域:
催化
·
生物质转化
·
绿色化学
·
材料科学
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Ruofan Shen,Yanyan Liu,Hao Wen,Tao Liu,Zhikun Peng,Xianli Wu,Xianghong Ge,Sehrish Mehdi,Huaqiang Cao,Erjun Liang,Jianchun Jiang,Baojun Li
High activity catalysts used for eliminating the energy barrier in water breaking-up are of great significance for accelerating those reactions retarded by water molecules dissociation. In this work, an oxygen vacancy (V O )-Ti ensemble engineering on Ru catalyst was established to boost the catalytic activity toward water dissociation. The V O in V O -Ti ensemble plays as electron promoter to transfers electrons to surface Ru atoms. The rich electron state of Ru boosts the catalytic activity toward water dissociation. As an experimental verification, the turnover frequency of 1.5-RTV O -4 in ammonia borane hydrolysis reaches up to 1370 min −1 (9710 min −1 depend on the dispersion of Ru), exceeding the benchmark value set up by Ru-based catalysts. This research provides a novel electronic tuning strategy for V O as imaginary atom via electron promoter effect to enhance the intrinsic catalytic activity of metal catalysts toward inert molecule dissociation in the next generation energy chemistry field.
研究领域:
催化
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Hao Wen,Fubin Ma,Haoyang Li,Yi Yue,Jiacheng Luo,Ruiyang Qu,Hepeng Zhang,Yueling Cao
Fabrication of metal/porous carbon catalysts with high catalytic activity and stability is highly desirable but challenging because the metal nanoparticles in these catalysts cannot have both high exposure and strong interaction with carbon support. Here, for the first time, a facile CO 2 -assisted one-pot pyrolysis (CAOP) strategy was developed to in situ liberate the inaccessible Ru sites without obviously affecting the size of Ru nanoparticles . The Ru@CN-700-80 prepared with the assistance of CO 2 exhibits a remarkable improvement in catalytic activity for levulinic acid hydrogenation compared with that without CO 2 during pyrolysis, giving a TOF of 28449 h −1 under mild conditions, which is superior to the reported Ru-based catalysts. Additionally, the Ru@CN-700-80 also demonstrates an excellent stability without activity loss after 10 cycles. We anticipate that this CAOP strategy addresses a crucial issue that currently plagues the design of metal/porous carbon catalyst with high catalytic performance applied in energy and environmental fields.
研究领域:
催化
·
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）