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Complete oxidation of methane on CoO-SnO catalysts

Xingfu TANG , Jiming HAO , Junhua LI ,

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 3, Pages 265-270 doi: 10.1007/s11783-009-0019-2

Abstract: CoO-SnO hybrid oxides were prepared by the coprecipitation method and were used to oxidate methane (CHExperimental results showed that the catalysts were considerably stable in the CH combustion reaction

Keywords： Co₃O₄-SnO₂ complete oxidation methane (CH₄)

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A density functional theory study of methane activation on MgO supported NiM cluster: role of M on C–H

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 10, Pages 1485-1492 doi: 10.1007/s11705-022-2169-8

Abstract: chemicals via methane steam/dry reforming reactions.CH₄ adsorption on Cu promoted Ni cluster requires overcoming an energy of 0.07 eV, indicatingThe role of M on the first C–H bond cleavage of CH₄ was investigated.In addition, doping the elements of the same family, like Pd and Pt, for CH₄ activation is₄ raises with the CH₄ electron gain increasing.

Keywords： CH₄ dissociation Ni–M C–H bond activation charge transfer

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The catalytic effect of both oxygen-bearing functional group and ash in carbonaceous catalyst on CH 4

Weidong ZHANG, Yongfa ZHANG,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 2, Pages 147-152 doi: 10.1007/s11705-009-0242-1

Abstract: A kind of new catalyst—carbonaceous catalyst—for CH-CO reformation has been developed inIt has been found that the carbonaceous catalyst is an efficient catalyst on CO-CH reforming.; the ash components in carbonaceous catalyst also have an important influence on the CO-CH reformingFeO, NaCO, and KCO in the ash can catalyze the CO-CH reforming reaction; CaO has little effect on CO-CHCaO can catalyze the gasification between carbonaceous catalyst and CO; AlO and MgO inhibit the CO-CH

Keywords： oxygen-bearing functional carboxyl phenolic hydroxyl CH-CO reformation CO-CH reforming

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CH₄ and N₂O emissions from double-rice cropping system as affected by Chinese milk

Heshui XU,Dengyun LI,Bo ZHU,Kai ZHANG,Yadong YANG,Chen WANG,Ying JIANG,Zhaohai ZENG

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 1, Pages 59-68 doi: 10.15302/J-FASE-2017137

Abstract: However, little is known about the integrated impacts of CMV and RS incorporation on CH and N O emissionsestimate the integrated impacts of CMV and RS incorporation in the early- and late-rice seasons on CHHowever, both CMV and RS incorporation increased CH emissions.Annual CH emissions ranged from 321 to 614 kg·hm from CMV and RS amendment treatments, which were 1.5RS amendments replacing N fertilizer, maintained stable yield, mitigated N O emission, but enhanced CH

Keywords： Chinese milk vetch CH₄ double-rice cropping system grain yield N₂O rice straw

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Frontier science and challenges on offshore carbon storage

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 7, doi: 10.1007/s11783-023-1680-6

Abstract:

● The main direct seal up carbon options and challenges are reviewed.

Keywords： Offshore carbon storage Direct CO₂ injection CO₂-CH₄ replacement

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Ni-Co bimetallic catalyst for CH

Xiaohong LI, Jun AI, Wenying LI, Dongxiong LI

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4, Pages 476-480 doi: 10.1007/s11705-010-0512-y

Abstract: reduction (TPR), temperature-programmed desorption (CO -TPD), and temperature-programmed surface reaction (CHbimetallic catalyst could provide more active sites and CO adsorption sites (C+ CO = 2CO) for the methane-reformingAccording to the CH -CO -TPSR, there were 80.9% and 81.5% higher CH and CO conversion over Ni-Co/AlO -ZrO catalyst, and its better resistance to carbon deposition, less than 0.5% of coke after 4 h reaction

Keywords： Ni-Co bimetallic catalyst composite support CH₄ reforming with CO₂

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Effect of TiO

Navid Azizi, Mojgan Isanejad, Toraj Mohammadi, Reza M. Behbahani

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 3, Pages 517-530 doi: 10.1007/s11705-018-1781-0

Abstract: The effects of the titanium dioxide nanoparticle load on the morphology and CO /CH separation performanceThe incorporation of TiO nanoparticles into the polymeric MMMs improved the CO /CH gas separation performanceThe CO permeability and ideal CO /CH selectivity values of the nanocomposite membrane loaded with 8

Keywords： mixed matrix membrane TiO₂ nanoparticles PEBAX-1657 CO₂/CH₄ separation

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Review on cryogenic technologies for CO removal from natural gas

Yujing BI, Yonglin JU

Frontiers in Energy 2022, Volume 16, Issue 5, Pages 793-811 doi: 10.1007/s11708-022-0821-0

Abstract: In this paper, the phase behavior of the CH₄-CO₂ binary mixture is summarized,

Keywords： cryogenic CO₂ removal purification of natural gas (NG) biogas upgrading CH₄-

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Effect of carbon deposition over carbonaceous catalysts on CH

Yongfa ZHANG, Meng ZHANG, Guojie ZHANG, Huirong ZHANG

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4, Pages 481-485 doi: 10.1007/s11705-010-0523-8

Abstract: bed reactor to understand the influence of carbon deposition obtained under different conditions on CHIt was found that the carbonaceous catalyst is an efficient catalyst in methane decomposition and CHdoes not affect methane decomposition significantly.The carbon deposition Type I generated at 900°C has a minor effect on CH -CO reforming and it easilywith carbon dioxide, but the carbon deposition Type II generated at 1000°C and 1100°C clearly inhibits CH

Keywords： carbon deposition carbonaceous catalyst CH₄-CO₂ reforming

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Dissolved methane in anaerobic effluent: Emission or recovery?

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-022-1537-4

Abstract: However, dissolved methane in anaerobic effluent appears to be a barrier towards the energy and carbonAlthough several dissolved methane recovery methods have been developed, their engineering feasibilityIn this perspective, we thus intend to offer additional insights into the cost-benefit of dissolved methane

Keywords： Anaerobic treatment Municipal wastewater Dissolved methane Methane recovery Carbon emission

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Design and analysis of dual fuel methanol-power poly-generation

Minghua WANG , Zheng LI , Weidou NI ,

Frontiers in Energy 2009, Volume 3, Issue 3, Pages 341-347 doi: 10.1007/s11708-009-0023-z

Abstract: A dual fuel head poly-generation flowsheet was designed based on coal gas and coke oven gas. To help clearly understand the system performance, a 1.2×10−3.2×10kg methanol and 274―496MW power poly-generation system was simulated by using the commercially available software ASPEN Plus and GT Pro. The technology scheme, the operating parameters, and the efficiency of the system were also analyzed and evaluated, which will be used for building industrial devices.

Keywords： dual fuel methanol-power poly-generation CO₂ and CH₄ reforming splitting ratio

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Artificial intelligence in gastroenterology: where are we heading?

Joseph JY Sung, Nicholas CH Poon

Frontiers of Medicine 2020, Volume 14, Issue 4, Pages 511-517 doi: 10.1007/s11684-020-0742-4

Abstract: Artificial intelligence (AI) is coming to medicine in a big wave. From making diagnosis in various medical conditions, following the latest advancements in scientific literature, suggesting appropriate therapies, to predicting prognosis and outcome of diseases and conditions, AI is offering unprecedented possibilities to improve care for patients. Gastroenterology is a field that AI can make a significant impact. This is partly because the diagnosis of gastrointestinal conditions relies a lot on image-based investigations and procedures (endoscopy and radiology). AI-assisted image analysis can make accurate assessment and provide more information than conventional analysis. AI integration of genomic, epigenetic, and metagenomic data may offer new classifications of gastrointestinal cancers and suggest optimal personalized treatments. In managing relapsing and remitting diseases such as inflammatory bowel disease, irritable bowel syndrome, and peptic ulcer bleeding, convoluted neural network may formulate models to predict disease outcome, enhancing treatment efficacy. AI and surgical robots can also assist surgeons in conducting gastrointestinal operations. While the advancement and new opportunities are exciting, the responsibility and liability issues of AI-assisted diagnosis and management need much deliberations.

Keywords： artificial intelligence endoscopy robotics gastrointestinal diseases

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Greenhouse gas emissions during co-composting of cattle feedlot manure with construction and demolition (C&D) waste

Xiying Hao, Francis J. Larney

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 3, doi: 10.1007/s11783-017-0955-1

Abstract: The CK and DG manures were co-composted with (4:1) C&D waste (treatments: CK_CD DG_CD), composted aloneIn contrast, CH emissions were reduced by the inclusion of C&D waste (64 gC·m with C&D vs. 244 gC·mwithout C&D) while the manure stockpile emitted the greatest amount of CH (464 gC·m ).Additionally, only 0.48% of C was emitted in CH form with C&D waste, compared to 1.68% when compostingThe lower CH emissions with C&D waste are beneficial in reducing overall GHG emissions from manure composting

Keywords： Livestock manure greenhouse gas flux straw bale compost bin N₂O CH₄ CO₂

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Online gasoline blending with EPA Complex Model for predicting emissions

Stefan JANAQI, Mériam CHÈBRE, Guillaume PITOLLAT

Frontiers of Engineering Management 2018, Volume 5, Issue 2, Pages 214-226 doi: 10.15302/J-FEM-2017022

Abstract: The empirical Complex Model developed by the US Environmental Protection Agency (EPA) is used by refiners to predict the toxic emissions of reformulated gasoline with respect to gasoline properties. The difficulty in implementing this model in the blending process stems from the implicit definition of Complex Model through a series of disjunctions assembled by the EPA in the form of spreadsheets. A major breakthrough in the refinery-based Complex Model implementation occurred in 2008 and 2010 through the use of generalized disjunctive and mixed-integer nonlinear programming (MINLP). Nevertheless, the execution time of these MINLP models remains prohibitively long to control emissions with our online gasoline blender. The first objective of this study is to present a new model that decreases the execution time of our online controller. The second objective is to consider toxic thresholds as hard constraints to be verified and search for blends that verify them. Our approach introduces a new way to write the Complex Model without any binary or integer variables. Sigmoid functions are used herein to approximate step functions until the measurement precision for each blend property is reached. By knowing this level of precision, we are able to propose an extremely good and differentiable approximation of the Complex Model. Next, a differentiable objective function is introduced to penalize emission values higher than the threshold emissions. Our optimization module has been implemented and tested with real data. The execution time never exceeded 1 s, which allows the online regulation of emissions the same way as other traditional properties of blended gasoline.

Keywords： emissions reformulated gasoline online control global optimization