Ethylene in Soil

Arshad, Muhammad; FrankenbergerJr., William T.

doi:10.1007/978-1-4615-0675-1_5

Cited by 2 publications

(4 citation statements)

References 106 publications

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“…Raman spectra of 0Ce and 5Ce catalysts were acquired between 200 and 1200 cm –l , showing only the vibrations of Cr oxide and chromate species (Figure a). The Raman peaks at 303, 350, 553, and 613 cm –1 are attributed to crystalline α-Cr 2 O 3 species. , The primary broadband between 750 and 1050 cm –1 originated from Cr 6+ species (852 cm –1 from hydrated di-chromate species Cr 2 O 7 , − ,, 888 cm –1 from symmetric stretching of hydrated surface mono-chromate species CrO 4 , − , and 1002 cm –1 from chromates with a higher degree of polymerization , ). Comparing the peak intensity of 0Ce and 5Ce catalysts indicates that the former contained more crystalline α-Cr 2 O 3 than the latter, which agrees with the XRD result (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…Ethylene is one of the most important chemical products in the world, which is utilized as a raw material in around 75% of chemical products including chemical fibers, plastics, and rubber. , The output of ethylene is the level of a country’s petrochemical industry development . For decades, the dehydrogenation of light alkanes to olefins has attracted extensive attention from academia and industry, and typically ethane is dehydrogenated to ethylene under the action of catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al₂O₃ for Direct Ethane Dehydrogenation to Ethylene

Luo

Wang²,

Jia

et al. 2023

J. Phys. Chem. C

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For the improvement of commercial catalyst 13 wt % Cr-γ-Al2O3 for the dehydrogenation of light alkanes to olefins, 13 wt % Cr-x wt % Ce-γ-Al2O3 catalysts with x equaling 0, 2.5, 5, 7.5, and 10, named as 0Ce, 2.5Ce, 5Ce, 7.5Ce, and 10Ce, are prepared by the incipient wetness impregnation method, characterized by X-ray diffraction, transmission electron microscopy, Raman, UV–vis, X-ray photoelectron spectroscopies, and temperature-programmed reduction and evaluated for ethane dehydrogenation to ethylene. Their performance increases with Ce addition to 5 wt % and then decreases and attenuates with time. 5Ce demonstrates the highest dehydrogenation activity and better regeneration ability than 0Ce. It is found that the as-prepared 5Ce contains more active amorphous Cr6+ species and less crystalline Cr3+ species (α-Cr2O3) than 0Ce, other than the Ce species of CeO2. The reasons for the better dehydrogenation and regeneration performance of 5Ce are that the CeO2 particles in 5Ce physically separate the Cr species, promoting the formation of Cr6+ species, preventing their aggregation and migration to form less active α-Cr2O3 and inactive α-(Cr, Al)2O3, and preserving more active Cr6+ species in the as-prepared and regenerated catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al₂O₃ for Direct Ethane Dehydrogenation to Ethylene

Luo

Wang²,

Jia

et al. 2023

J. Phys. Chem. C

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“…C 2 H 4 is produced by most plant parts, and can also be produced by microbial activity. In soil even extremely low concentrations of a few ppb can have a strong effect on root growth [25]. In water saturated soil C 2 H 4 can accumulate and reach concentrations > 10 ppm [26].…”

Section: Why Soil Gases?mentioning

confidence: 99%

“…C 2 H 4 can be produced and consumed in the soil, similar to CH 4 and N 2 O. The local concentration of C 2 H 4 in the soil represents the balance of production and consumption and depends on the diffusivity of the aerated soil [25,27].…”

Section: Why Soil Gases?mentioning

confidence: 99%

Long Term Soil Gas Monitoring as Tool to Understand Soil Processes

et al. 2020

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Soils provide many functions as they represent a habitat for flora and fauna, supply water, nutrient, and anchorage for plant growth and more. They can also be considered as large bioreactors in which many processes occur that involve the consumption and production of different gas species. Soils can be a source and sink for greenhouse gases. During the last decades this topic attracted special attention. Most studies on soil-atmosphere gas fluxes used chamber methods or micro-meteorological methods. Soil gas fluxes can also be calculated from vertical soil gas profiles which can provide additional insights into the underlying processes. We present a design for sampling and measuring soil gas concentration profiles that was developed to facilitate long term monitoring. Long term monitoring requires minimization of the impact of repeated measurements on the plot and also minimization of the routine workload while the quality of the measurement needs to be maintained continuously high. We used permanently installed gas wells that allowed passive gas sampling at different depths. Soil gas monitoring set ups were installed on 13 plots at 6 forest sites in South West Germany between 1998 and 2010. Until now, soil gas was sampled monthly and analysed for CO2, N2O, CH4, O2, N2, Ar, and C2H4 using gas chromatography. We present typical time series and profiles of soil gas concentrations and fluxes of a selected site as an example. We discuss the effect of different calculation approaches and conclude that flux estimates of O2, CO2 and CH4 can be considered as highly reliable, whereas N2O flux estimates include a higher uncertainty. We point out the potential of the data and suggest ideas for future research questions for which soil gas monitoring would provide the ideal data basis. Combining and linking the soil gas data with additional environmental data promises new insights and understanding of soil processes.

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Ethylene in Soil

Cited by 2 publications

References 106 publications

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al₂O₃ for Direct Ethane Dehydrogenation to Ethylene

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al₂O₃ for Direct Ethane Dehydrogenation to Ethylene

Long Term Soil Gas Monitoring as Tool to Understand Soil Processes

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Ethylene in Soil

Cited by 2 publications

References 106 publications

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al2O3 for Direct Ethane Dehydrogenation to Ethylene

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al2O3 for Direct Ethane Dehydrogenation to Ethylene

Long Term Soil Gas Monitoring as Tool to Understand Soil Processes

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Product

Resources

About

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al₂O₃ for Direct Ethane Dehydrogenation to Ethylene

Improved Performance of Commercial Catalyst 13 wt % Cr-γ-Al₂O₃ for Direct Ethane Dehydrogenation to Ethylene