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Journal Article 6

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2023 1

2017 1

2015 2

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2007 1

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ruthenium 2

Bromate 1

Catalyst Support 1

Crystal structure 1

Fischer-Tropsch synthesis 1

Iron 1

Molybdenum 1

Rhenium 1

Rhodium 1

Ruthenium 1

Size effect 1

ascension 1

catalyst prepared 1

cellulose 1

cobalt and ruthenium carbides 1

dimethyl phthalate 1

disinfection byproduct 1

ethane 1

hexitols 1

hydrogenation 1

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Light olefins synthesis from С

Anton SHALYGIN, Evgenii PAUKSHTIS, Evgenii KOVALYOV, Bair BAL’ZHINIMAEV

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 3, Pages 279-288 doi: 10.1007/s11705-013-1338-1

Abstract: A two-step process was employed to convert methane or ethane to light olefins via the formation of an intermediate monoalkyl halide. A novel K RuOCl /TiO catalyst was tested for the oxidative chlorination of methane and ethane. The catalyst had high selectivity for methyl and ethyl chlorides, 80% and 90%, respectively. During the oxychlorination of ethane at ≥250°C, the formation of ethylene as a reaction product along with ethyl chloride was observed. In situ Fourier transform infrared studies showed that the key intermediate for monoalkyl chloride and ethylene formation is the alkoxy group. The reaction mechanism for the oxidative chlorination of methane and ethane over the Ru-oxychloride catalyst was proposed. The novel fiber glass catalyst was also tested for the dehydrochlorination of alkyl chlorides to ethylene and propylene. Very high selectivities (up to 94%–98%) for ethylene and propylene formation as well as high stability were demonstrated.

Keywords： oxychlorination methane ethane light olefins ruthenium catalyst

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Catalytic reduction of water pollutants: knowledge gaps, lessons learned, and new opportunities

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 2, doi: 10.1007/s11783-023-1626-z

Abstract:

● Advances, challenges, and opportunities for catalytic water pollutant reduction.

Keywords： Molybdenum Rhenium Rhodium Ruthenium Catalyst Support Bromate

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Catalytic ozonation of organic compounds in water over the catalyst of RuO

Jianbing WANG,Guoqing WANG,Chunli YANG,Shaoxia YANG,Qing HUANG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4, Pages 615-624 doi: 10.1007/s11783-014-0706-5

Abstract: This research investigates the performances of RuO /ZrO -CeO in catalytic ozonation for water treatment. The results show that RuO /ZrO -CeO was active for the catalytic ozonation of oxalic acid and possessed higher stability than RuO /Al O and Ru/AC. In the catalytic ozonation of dimethyl phthalate (DMP), RuO /ZrO -CeO did not enhance the DMP degradation rate but significantly improved the total organic carbon (TOC) removal rate. The TOC removal in catalytic ozonation was 56% more than that in noncatalytic ozonation. However this does not mean the catalyst was very active because the contribution of catalysis to the overall TOC removal was only 30%. The adsorption of the intermediates on RuO /ZrO -CeO played an important role on the overall TOC removal while the adsorption of DMP on it was negligible. This adsorption difference was due to their different ozonation rates. In the catalytic ozonation of disinfection byproduct precursors with RuO /ZrO -CeO , the reductions of the haloacetic acid and trihalomethane formation potentials (HAAFPs and THMFPs) for the natural water samples were 38%–57% and 50%–64%, respectively. The catalyst significantly promoted the reduction of HAAFPs but insignificantly improved the reduction of THMFPs as ozone reacts fast with the THMs precursors. These results illustrate the good promise of RuO /ZrO -CeO in catalytic ozonation for water treatment.

Keywords： ozonation ruthenium oxalic acid dimethyl phthalate disinfection byproduct

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Preparation and influence of performance of anodic catalysts for direct methanol fuel cell

WANG Zhenbo, YIN Geping, SHI Pengfei

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1, Pages 20-25 doi: 10.1007/s11705-007-0005-9

Abstract: This research aims at increasing the utilization of platinum-ruthenium alloy (Pt-Ru) catalysts and thusThe structure of the catalyst was modified, and there was an increase in the conversion of ruthenium

Keywords： catalyst prepared stability ascension potentiostatic polarization platinum-ruthenium

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Particle Size and Crystal Phase Effects in Fischer-Tropsch Catalysts

Jin-Xun Liu, Peng Wang, Wayne Xu, Emiel J. M. Hensen

Engineering 2017, Volume 3, Issue 4, Pages 467-476 doi: 10.1016/J.ENG.2017.04.012

Abstract:

Fischer-Tropsch synthesis (FTS) is an increasingly important approach for producing liquid fuels and chemicals via syngas—that is, synthesis gas, a mixture of carbon monoxide and hydrogen—generated from coal, natural gas, or biomass. In FTS, dispersed transition metal nanoparticles are used to catalyze the reactions underlying the formation of carbon-carbon bonds. Catalytic activity and selectivity are strongly correlated with the electronic and geometric structure of the nanoparticles, which depend on the particle size, morphology, and crystallographic phase of the nanoparticles. In this article, we review recent works dealing with the aspects of bulk and surface sensitivity of the FTS reaction. Understanding the different catalytic behavior in more detail as a function of these parameters may guide the design of more active, selective, and stable FTS catalysts.

Keywords： Fischer-Tropsch synthesis Iron cobalt and ruthenium carbides Size effect Crystal structure

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Selective conversion of cellulose to hexitols over bi-functional Ru-supported sulfated zirconia and silica-zirconia catalysts

Zhiqiang Song,Hua Wang,Yufei Niu,Xiao Liu,Jinyu Han

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 4, Pages 461-466 doi: 10.1007/s11705-015-1543-1

Abstract: We report a process of selective conversion of microcrystalline cellulose to hexitols over bi-functional Ru-supported sulfated zirconia and silica-zirconia catalysts. A 58.1% yield of hexitols and a 71.0% conversion of cellulose were achieved over Ru/SZSi(100:15)-773 catalyst at 443 K. The as-synthesized catalysts were characterized by X-ray diffraction (XRD), BET, thermogravimetric analysis and pyridine adsorption Fourier transform infrared spectroscopy (FTIR). XRD results indicated that the sulfated catalysts were pure tetragonal phase of ZrO when calcined at 773 K. Monoclinic zirconia appeared at the calcination temperature of 873 K, and the content of monoclinic phase increased with the elevating temperature. Compared with sulfated zirconia catalyst, sulfated silica-zirconia catalysts possessed a higher ratio of Brønsted to Lewis on the surface of catalysts, as shown from pyridine adsorption FTIR results. The reaction results indicated that the tetragonal zirconia, which is necessary for the formation of superacidity, was the active phase to cellulose conversion. The higher amounts of Brønsted acid sites can remarkably accelerate the cellulose depolymerization and promote side reactions that convert C5–C6 alcohols into the unknown soluble degradation products.

Keywords： hexitols cellulose hydrogenation sulfated zirconia ruthenium