RSC Advances
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2016
·Vol. 6
·期 81
·77499-77506
·
IF 3.289
Kai Zhang,Shubin Wu,He Yang,Huimin Yin,Gang Li
As promising and environmentally friendly catalysts, tungsten-containing heteropoly acids combined with supported noble metals were used for one-pot hydrothermal conversion of cellulose into polyols in the presence of pressurized hydrogen. The microcrystalline cellulose was completely converted over a mixed catalyst consisting of a low concentration of phosphotungstic acid (PTA) (0.03 wt%) and Ru/activated carbon (Ru/AC) via an one-pot hydrothermal reaction, with an ethylene glycol (EG) yield of up to 53.1% under optimal conditions. The catalytic activity of the mixed catalyst gradually decreased with increasing reaction runs, which could be mainly ascribed to the aggregation of Ru/AC particles, and to the coverage of the active sites of Ru due to the deposition of organic materials. Cellobiose was used as a model feedstock for a comparative study on the reaction pathways of the conversion of cellulose, and the results revealed that catalytic conversion of cellobiose consisted of at least three important parallel reactions under the present hydrothermal conditions, which were also most likely involved during the catalytic conversion of cellulose for EG production. Effective control of these reactions would be helpful to further maximize the EG yield during the catalytic conversion of cellulose.
研究领域:
化学工程
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可再生资源转化
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Qi-Ying Liu,Yu-He Liao,Tie-Jun Wang,Chi-Liu Cai,Qi Zhang,Noritatsu Tsubaki,Long-Long Ma
ZrP with large surface, mesoporous volume, and size was prepared. Its catalytic performance was evaluated in hydrolytic hydrogenation of cellulose to sorbitol/mannitol combined with commercial Ru/C. A significantly enhanced sorbitol/mannitol yield was obtained as compared with that of the water-soluble acidic phosphates and buffer solution of potassium acid phthalate combined with the same Ru/C. The enhanced yield was attributed to the Lewis and Brönsted acid on ZrP surface improving the surface’s absorption and activation for cellulose and accelerating the rate-determined hydrolysis step. The maximal sorbitol/mannitol yield of 63% and 81% could be obtained by using microcrystalline and ball milling cellulose as the feedstock, respectively. The ZrP combined with Ru/C was adaptable to the high concentrated cellulose and obtained 5.8 wt % of sorbitol/mannitol concentration. The remarkably enhanced cellulose hydrolysis by ZrP sharply decreased the use of Ru/C, which is significant for the essential application.
研究领域:
化学工程
·
可再生资源转化
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2017
·
IF 2.651
Shi-Yuan Liu,Lin-Yan Xu,Chun-Yu Liu,Zhi-Gang Ren,David James Young,Jian-Ping Lang
An efficient catalytic system containing [RuCl 2 (η 6 -p-cymene)] 2 and one P,N ligand, N-diphenylphosphino-2-aminopyridine ( L1 ) was loaded in catalyzing the alkylation of ketones with primary alcohols for a diverse array of substrates. Other five P,N ligands based on pyridin-2-amine and pyrimidin-2-amine were also examined in this reaction to explore the influence of steric hindrance and electronic effects. Monitoring by 1 H NMR and ESI-MS reveals a stable cationic L1 -coordinated ruthenium hydride intermediate, identified as [Ru(η 6 -p-cymene)(κ 2 - L1 )H] + . Organic intermediates consistent with a three-step dehydrogenation , alkylation and hydrogenation pathway were also observed. The final step in this reaction, the ruthenium-catalysed transfer hydrogenation reduction of α,β-unsaturated ketone with benzyl alcohol was performed separately.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Wei Lv,Xiaohong Hu,Yuting Zhu,Ying Xu,Shijun Liu,Peili Chen,Chenguang Wang,Longlong Ma
Herein, the catalysts of ruthenium and molybdenum oxide nanoparticles supported on activated carbon (AC) were synthesized by precursor stepwise impregnation and employed for the hydrodeoxygenation (HDO) of lignin oil. The XRD, TEM, XPS and NH 3 -TPD-MS result of RuMoO x /AC catalysts confirm that the method of loading molybdenum precursor before ruthenium precursor is advantageous for the MoO x and Ru nanoparticles high dispersion and the reduction of MoO x species enhance the amount of acidity of catalyst. Meanwhile, the reduction temperature of RuMoO x /AC-1-T catalysts could effectively regulate the MoO x species that determine the activity and product distribution of HDO. The conversion of aromatic monomers/dimers were up to 96% with high selectivity of hydrocarbon over RuMoO x /AC-1-350 catalyst at 160 °C and 30 bar H 2 . Which is attributed to the MoO 3 and Ru species possess the excellent activity of benzene ring deep hydrogenation, ether bond breaking and acid dehydration. The RuMoO x /AC-1-350 catalyst effectively converted lignin oil (from the depolymerization of cornstalk hydrolysis residue) into hydrocarbons (56.9 wt%) and cyclohexanol/ethers (18.7 wt%) under 280 °C and 3 bar H 2 . The durability of the RuMoO x /AC-1-350 catalyst for HDO of lignin oil was also investigated and showed that the RuMoO x /AC-1-350 catalyst had good stability, regenerability and repeatability.
研究领域:
催化化学
·
能源化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 42
·15724-15734
·
IF 8.307
Shaohua Chai,Shuangde Li,Le Zhang,Guijun Fan,Linfeng Nie,Xin Zhou,Wuxinchen Yang,Weiman Li,Yunfa Chen
The regulation of oxygen vacancies and Ru species using metal–organic frameworks was synergically adopted in a rational design to upgrade Ru/TiO2 catalysts, which are highly active for the catalytic oxidation of dichloromethane (DCM) with less undesired byproducts. In this work, Ru/M-TiO2 and Ru/N-TiO2 catalysts were synthesized by the pyrolysis of MIL-125 and NH2-MIL-125 incorporated with Ru, the existence of Ru nanoclusters and nanoparticles was detected by XAFS, respectively, and the catalytic performance was analyzed comprehensively. Complete oxidation of DCM was obtained at ∼290 °C over Ru/M-TiO2 and Ru/N-TiO2 catalysts, while Ru/N-TiO2 showed quite less monochloromethane (MCM) and higher CO2 yields, and better dechlorination capacity in oxidation. The distinction comes down to that the easier desorption of chlorine could be achieved over Ru4+ which act as the main activated adsorption sites for DCM in Ru/N-TiO2, compared to oxygen vacancies that serve as the main dissociation sites in Ru/M-TiO2. Additionally, Ru/N-TiO2 exhibited superior stability and excellent resilience in moisture. An in situ DRIFTS experiment further indicated the different DCM catalytic degradation process as well as the reaction mechanism over the as-prepared catalysts.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jingwei Du,Jinjun Li,Zhixiong You
This study explores the preparation of a Cs-doped Ru/ZrO 2 catalyst using a low eutectic system and its application in ammonia synthesis. Additionally, it examines the effect of Cs doping on enhancing the catalyst's resistance to hydrogen poisoning. Compared to the undoped Ru/ZrO 2 catalyst and the Cs–Ru/ZrO 2 –B catalyst prepared through the grinding method for promoter incorporation, the Cs–Ru/ZrO 2 -A catalyst synthesized using the low eutectic system demonstrated significantly enhanced activity. At 400 °C and 0.1 MPa, the Cs–Ru/ZrO 2 -A catalyst achieved an ammonia synthesis activity of 1769 μmol g cat −1 h −1 , which is approximately 35 times higher than that of the undoped Ru/ZrO 2 catalyst. The structure of the catalyst was analyzed using various material characterization techniques, including XRD, XPS, and SEM. The results showed that the Cs–Ru/ZrO 2 -A catalyst, prepared under identical conditions, exhibited no significant structural differences compared to other catalysts. However, further TPR and TPD analyses revealed that Cs interacts with Ru to some extent, affecting its reduction behavior and enhancing the catalytic reaction rate for ammonia synthesis. Additionally, detailed XPS analysis of all catalysts was conducted, leading to a proposed relationship between the catalytic reaction rate and the oxidation states of the metal components. The study revealed that the presence of Cs significantly inhibits hydrogen poisoning of the catalyst. Furthermore, it demonstrated that the addition of promoters enhances H 2 dissociation by supplying electrons to the active metal Ru, while Cs plays a crucial role in effectively suppressing hydrogen poisoning.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Hongming Liu,Junhui Liang,Jiaxin Li,Yuhui Du,Hangning Chen,Chenhao Du,Liuqi Wang,Yincheng Li,Yuexiang Huang,Da Chen
While ammonia serves as a carbon-free hydrogen carrier, addressing challenges in hydrogen energy storage and transportation, the present technology for thermocatalytic ammonia decomposition encounters constraints owing to elevated decomposition temperatures. Alkali metal promoters have been demonstrated to effectively lower the reaction temperature. However, their precise role in the process of ammonia dehydrogenation remains not fully understood. Herein, we investigated the impact of alkali metals by incorporating various base treatments (with (i.e., KOH) or without alkali metals (i.e., NH3·H2O)) during the deposition process. The results indicate that compared to samples without alkali metal treatment, catalysts with added alkali metals (5 wt % Ru/CeO2-NP(KOH)) show a 16.7% improvement in ammonia decomposition efficiency and a 5.54 mmol gcat–1 min–1 increase in hydrogen production rate under the same test conditions (500 °C, gas hourly space velocity (GHSV) of 30,000 mL gcat–1 h–1). This phenomenon may be attributed to the dual promotion of alkali metal K in regulating both vacancy defects and metal active sites. The regulatory mechanism of alkali metal activity proposed by us not only provides a better understanding of the specific role of alkali metals in the reaction process but also holds significant implications for guiding the design of novel catalysts.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 11
·827
·
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
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Ya-Qi Shan,Lin-Xin Yin,Oraléou Sangué Djandja,Zhi-Cong Wang,Pei-Gao Duan
Ru supported on activated carbon (C), Al 2 O 3 , CeO 2 , MgO, TiO 2 , and ZrO 2 were prepared and employed to boost supercritical water gasification (SCWG) of microalgae hydrothermal liquefaction (HTL) downstream water at 600 °C for 1 h. Effects of catalysts, water density, and Ru/C loading on total organic carbon (TOC) reduction, carbon gasification efficiency (CGE), and gas yield were examined. All the Ru catalysts showed a positive effect on TOC reduction and converted organics in the HTL downstream water to fuel gas, with H 2 and CH 4 as the two most abundant component. With the addition of Ru/C, almost complete removal of TOC, the highest CGE, and H 2 yield were achieved due to its largest metal dispersion. With the addition of Ru/C, increasing water density and catalyst loading favored TOC reduction and CGE increase as well as the total gas yield. The highest H 2 content of 50% and yield of 2.62 mmol/g (aq.) were obtained at the highest catalyst loading of 12.0 mg (Ru/C) /mL (aq.) . This study suggested that SCWG with the addition of Ru/C was a promising strategy to produce fuel gas rich in H 2 , from the organics in the microalgae HTL downstream water.
研究领域:
环境科学
·
能源工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Tao Ding,Yishuang Wu,Xun Zhu,Guiying Lin,Xun Hu,Hongqi Sun,Yong Huang,Shu Zhang,Hong Zhang
Co-doping of heteroatoms into the support of metal-supported catalysts is a prevalent method to improve the catalytic performance by adjusting metal–support interactions. This paper investigated the catalytic performances of Ru supported on biomass-derived char (Ru@Char), N-doped char (Ru@N-Char), and N,P-co-doped char (Ru@NP-Char) in the emerging lignin-first depolymerization for both poplar (hardwood) and pine (softwood) samples, with an emphasis on the production of phenolic monomers. Various characterizations of the prepared catalysts showed that the codoping of N,P not only facilitated the formation of micropores in the char but also introduced weak and moderate acid sites. Furthermore, the sizes of Ru nanoparticles on the codoped char became smaller, and the proportion of metallic Ru species was increased, resulting from electron transfer from Ru to the codoped char. The yields of the phenolic monomers from poplar and pine over Ru@NP-Char were as high as 57.98 and 17.53 wt % Klason lignin, respectively, which were improved by factors of 1.4–2.5 in comparison to Ru@Char and Ru@N-Char. Full delignification during the depolymerization of both poplar and pine was also achieved over Ru@NP-Char.
研究领域:
催化化学
·
生物质能
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2017
·
IF 10.614
Guangyue Xu,Ying Zhang,Yao Fu,Qingxiang Guo
A catalytic system over Ru-HAP catalyst is established to hydrodeoxygenate various oils to long-chain alkanes in water, for potential large-scale renewable diesel production, which has the following advantages. (i) This system is versatile to different oil sources, including Jatropha oil, palm oil, waste cooking oil, and cooking waste. (ii) Ru-HAP is highly efficient at achieving full conversion from stearic acid to alkanes at as low as 100 °C, and the isolated yield from Jatropha oil, palm oil, and waste cooking oil to long-chain alkanes reached up to 95, 96, and 87 mol % at 180 °C and 2 MPa H2 within 4–4.5 h, respectively. (iii) The catalyst showed high stability during five runs of recycling, ICP-OES analysis, and a hydrothermal treatment. The activity decreased less than 5% after the catalyst was treated in water at 200 °C for 24 h with a stirring speed of 1000 rpm due to the strong metal and hydrothermally stable support interaction. (iv) Ru-HAP is compatible with most impurities such as various salts, sugars, and macromolecules. (v) The system required low cost for operation since no dehydration before the reaction was necessary and the alkane product can be easily separated from water. The reaction route was investigated and indicated that the coexisting hydrodehydration and hydrodecarbonylation are affected by water, temperature, and H2 pressure. The catalyst was also characterized in detail, and its high reactivity and stability may result from the fact that highly distributed Ru nanoclusters anchored on the HAP support absorbed fatty acids by forming a metastable calcium carboxyl phosphate.
研究领域:
催化化学
·
可再生能源
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Fanghui Wang,Yimeng Luo,Yajun Zhang,Yanan Wang,Hong Zhu
A NiO–Ni foam composite carrier was prepared by the hydrothermal method. Ruthenium metal was supported on the NiO–Ni foam by electroplating, obtaining a highly active bush-like Ru/NiO–Ni foam catalyst. To investigate the effect of NiO on the structure and performance of the catalyst, a Ru/Ni foam catalyst was prepared as a reference. The structures of the carrier and both catalysts were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, and the performances of both catalysts were evaluated in alcoholytic hydrogen production from sodium borohydride. On the carrier with the NiO-treated surface, the active component Ru developed a three-dimensional bush-like structure that enhanced the catalytic activity. Indeed, the hydrogen production from alcoholysis of sodium borohydride was three times higher on the Ru/NiO–Ni foam catalyst than on the Ru/Ni foam catalyst, and the highest rate exceeded 6 L/g/min. The repeated-use stability of the Ru/NiO–Ni catalyst (10 times) also exceeded that of Ru/Ni foam (8 times). However, as both catalysts used the same active component (i.e., Ru), their activation energies were almost identical.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）