Improvement of methane activation using n-hexane as co-reactant over Zn/HZSM-11 zeolite

Anunziata, Oscar A.; Mercado, Griselda Verónica González; Pierella, Liliana B.

doi:10.1016/j.catcom.2004.04.008

Cited by 52 publications

(47 citation statements)

References 10 publications

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“…[4,6] Apart from approaches to the indirect conversion of methane via syngas, [7] numerous attempts have been devoted in the past decades to direct transformation of methane into more valuable products. [4,[8][9][10][11][12][13][14][15][16] Recent investigations have implied that co-conversion [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] of methane and hydrocarbons/ oxygenates on metal-containing (e.g., Ga, Zn, Mo, In, Ag, and Pt) zeolite catalysts could be promising processes performed at much lower temperatures under non-oxidative conditions. Rational development of these co-conversion processes will certainly benefit from the understanding of mechanisms involved in both methane activation and further transformation on the working catalysts.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Wang

et al. 2010

Chemistry A European J

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Solid‐state 13C magic angle spinning (MAS) NMR spectroscopy investigations identified zinc methyl species, formate species, and methoxy species as C1 surface species formed in methane activation on the zeolite Zn/H‐ZSM‐5 catalyst at T≤573 K. These C1 surface species, which are possible intermediates in further transformations of methane, were prepared separately by adsorption of 13C‐enriched methane, carbon monoxide, and methanol onto zinc‐containing catalysts, respectively. Successful isolation of each surface species allowed convenient investigations into their chemical nature on the working catalyst by solid‐state 13C MAS NMR spectroscopy. The reactivity of zinc methyl species with diverse probe molecules (i.e., water, methanol, hydrochloride, oxygen, or carbon dioxide) is correlated with that of organozinc compounds in organometallic chemistry. Moreover, surface formate and surface methoxy species possess distinct reactivity towards water, hydrochloride, ammonia, or hydrogen as probe molecules. To explain these and other observations, we propose that the C1 surface species interconvert on zeolite Zn/H‐ZSM‐5. As implied by the reactivity information, potential applications of methane co‐conversion on zinc‐containing zeolites might, therefore, be possible by further transformation of these C1 surface species with rationally designed co‐reactants (i.e., probe molecules) under optimized reaction conditions.

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Section: Introductionmentioning

confidence: 99%

Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Wang

et al. 2010

Chemistry A European J

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“…Thanks to the studies by Choudhary et al, the enhanced activation of methane at mild conditions (i.e., 400-600 °C) is observed when higher alkanes and/or alkenes are co-fed with methane [13]. Based on this discovery, similar results are reported using various catalysts when methane was co-fed with a series of hydrocarbons, like ethane, propane, pentane, hexane, light gasoline, liquefied petroleum gas, and even oxygenated hydrocarbons such as methanol [14][15][16][17][18][19].…”

Section: Nonoxidative Methane Activation In Heavy Oil Upgradingmentioning

confidence: 53%

“…5. 15 The hypothetic reaction mechanism of methane activation and addition to the broken pieces formed during hydrocarbon cracking over Ag-Zn/ZSM-5 (M = Zn 2+ or Ag + ) [31] (Reproduced from Ref. [31] with permission from the Royal Society of Chemistry) 5.3 Heavy Oil Upgrading with Methane: Model Compound Studies bond is broken, the H atom bonds with the O atom of the zeolite framework and the formed methyl group interact with the metal cation.…”

Section: Heavy Oil Upgrading With Methane: Model Compound Studiesmentioning

confidence: 99%

Catalytic Upgrading of Heavy Oil Resources Under Methane

Song

Jarvis

Meng

et al. 2021

Methane Activation and Utilization in the Petrochemical and Biofuel Industries

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“…Drawn with reference to [11] pioneering work for new paths of methane utilization. Subsequent studies further revealed that despite the inert nature of methane, if it was co-fed with other compounds such as hydrocarbons or oxygenated species, the interactive reaction could occur at much milder reaction conditions with the assistance of zeolite catalysts, and the hydrogen atoms in methane can be fully used as hydrogen donors to produce valuable products [18][19][20][21]. After that, zeolites have become the main choice as the catalyst supports for the upgrading process in the presence of methane for decades.…”

Section: Catalysts For Biomass Valorization Under Methane Environmentmentioning

confidence: 99%

Biomass Valorization Under Methane Environment

Song¹,

Jarvis²,

Meng³

et al. 2021

Methane Activation and Utilization in the Petrochemical and Biofuel Industries

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Biomass Valorization Under Methane Environment IntroductionEnergy consumption continues to increase, while the use of unrenewable energy resources such as fossil fuels brings a myriad of problems such as energy crises, environment pollution, greenhouse gas accumulation, deglaciation, and ecosystem destruction [1]. Therefore, developing renewable energy resources is of great urgency. Biomass refers to faunal and floral materials used for energy generation or the production of a range of chemicals, which can be regarded as a renewable substituent of conventional resources. Biomass also covers a variety of agricultural and domestic waste materials such as wheat straw, corn cobs, manure, and household garbage [2]. Therefore, the utilization of biomass not only compensates the shortage of energy supply but also converts various intractable wastes into valuable products, namely, turning "trash" into "treasure" [3]. As a result, corresponding studies are critical for environment protection and sustainable development.Current biomass utilization techniques include biological conversion, gasification, liquefaction, pyrolysis, and hydrodeoxygenation [4]. Corresponding research of these pathways provides solutions for using biomass effectively, while several intrinsic drawbacks are still hard to overcome. Biological processes (Fig. 7.1) are often operated at mild conditions, and the selectivity towards valuable products is often favorable. However, the product yield and efficiency are still undesirable, leading to high operational cost and low profitability of the whole process [5]. Gasification (Fig. 7.2) is less costly and can handle biomass with high water content, but the operation temperature is relatively high, and the product distribution is hard to control, resulting in extra energy consumption and greenhouse gas emissions [6]. Liquefaction (Fig. 7.3) occurs at much milder temperatures and produces more liquid products, while a solvent is usually needed, and the intricacy and high cost limit its practical applications [7]. Pyrolysis (Fig. 7.4) also adopts relatively mild reaction temperatures and pressures. In this process, gas, liquid, and solid

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Improvement of methane activation using n-hexane as co-reactant over Zn/HZSM-11 zeolite

Cited by 52 publications

References 10 publications

Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Catalytic Upgrading of Heavy Oil Resources Under Methane

Biomass Valorization Under Methane Environment

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Improvement of methane activation using n-hexane as co-reactant over Zn/HZSM-11 zeolite

Cited by 52 publications

References 10 publications

Reactivity of C1 Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Reactivity of C1 Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Catalytic Upgrading of Heavy Oil Resources Under Methane

Biomass Valorization Under Methane Environment

Contact Info

Product

Resources

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Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite