Light olefins by methane partial oxidation using hydrated waste eggshell as catalyst

Lima, Dirléia dos Santos; Perez‐Lopez, Oscar W.

doi:10.1016/j.fuel.2021.120947

Cited by 3 publications

(3 citation statements)

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“…These radicals are responsible for activating methane, forming methyl radicals, which are then coupled in the gas phase, forming ethane. Ethylene is finally produced through ethane dehydrogenation reaction 23 or partial oxidation 24 . Another point that can be observed from Fig.…”

Section: Resultsmentioning

confidence: 81%

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Ethylene production by partial oxidation of biogas using lime as catalyst

May,

Perez‐Lopez

2023

J of Chemical Tech & Biotech

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The oxidative coupling of methane (OCM) is an interesting route for direct conversion of methane into ethylene and ethane. Nevertheless, COx is a secondary product of this route, which decreases the selectivity of hydrocarbons. In this work it is proposed to overcome this drawback by using biogas as source of methane. In addition to being a renewable source of methane, the presence of CO2 in biogas may shift the balance of the methane combustion. For this purpose, it was evaluated how process conditions such as O2 and CO2 flow rates and temperature affect biogas‐based OCM, in the temperature range of 650 – 800 °C, using lime as catalyst. The increase in CO2 flow from 0 to 15 mL.min‐1 increased the ethylene selectivity from 25.9% to 44.5% at 800 °C. As consequence, CO2 formation dropped from 53.9% to 18.3%. Methane conversion was not affected significantly by CO2 flow rate, remaining in the range of 22 – 25%. O2 flow was essential to activate the OCM reaction and the presence of higher concentrations of O2 favored the selectivity of ethylene, but also increased the CO2 produced through methane combustion. In the OCM experiments with variable flow of CO2, the highest C2 yield of 18% was obtained for the highest flow of co‐fed CO2, whereas the experiments with biogas and variable O2 flow showed the highest yield of ethylene for the highest flow of air co‐fed. Thus, biogas‐based OCM was shown to be a promising route to improve C2 selectivity, since the CO2 present in the biogas minimizes the formation of CO2 in the reaction. The use of lime as a low‐cost catalyst proved to be viable for the OCM reaction, presenting results compatible with those obtained for catalysts with more complex composition.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 81%

“…Ethylene is finally produced through ethane dehydrogenation reaction 23 or partial oxidation. 24 Another point that can be observed from Fig. 6, for the condition without air flow, is that CO 2 alone does not act as a good oxidizing agent for OCM reaction when using lime as the catalyst.…”

Section: Catalyst Characterizationmentioning

confidence: 88%

Ethylene production by partial oxidation of biogas using lime as catalyst

May,

Perez‐Lopez

2023

J of Chemical Tech & Biotech

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“…Due to increasing demand for light alkenes and their products, the conversion of starting materials such as light alkanes, 1-11 alcohols, [12][13][14][15][16] carbon dioxide, [17][18][19][20][21][22][23] has become an important industrial process. Steam cracking of natural gas 16,[24][25][26][27][28][29][30][31] and naphtha [32][33][34] as well as fluid catalytic cracking in oil refining has been among the earliest techniques employed. Recent efforts have focused on developing less energy intensive and more selective alternatives to steam cracking.…”

Section: Introductionmentioning

confidence: 99%

Insight into Dehydrogenation of C2HX Species in Ethane Steam Reforming on Ir(100): A DFT Study

Ore,

Wu,

Wang

2023

Preprint

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The reaction barrier and heat of formation of various dehydrogenation reactions involved in the steam reforming of ethane (SRE) are critical parameters in the understanding and improving the technology of SRE. Focusing on Ir-based catalyst, we report a comprehensive reaction network of dehydrogenation of ethane on Ir(100) based on extensive density functional theory (DFT) calculations on 10 C-H bond cleavage reactions. The geometric and electronic structures of the adsorption of C2Hx species with corresponding transition-state and product structures are reported. We found that the C-H bond in CH3C required the most energy to activate, due to the most stable four-fold hollow configuration of the adsorption site. Ethane can easily dissociate to CH3CH and CH2CH2 on Ir(100). By using the degree of dehydrogenation of the reactant species as a variable to correlate the C-H bond cleavage barrier as well as reaction energy, DFT results reveal that the Ir(100) surface to a great extent promotes ethane dehydrogenation when compared to other surfaces.

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