Some technological aspects of methane aromatization (direct and via oxidative coupling)

Skutil, Krzysztof; Taniewski, M

doi:10.1016/j.fuproc.2005.12.001

Cited by 70 publications

(57 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They insisted that catalyst regeneration at lower temperatures suppresses the sublimation and migration of MoO x species, and thereby can effectively preserve the activity and stability, but characterization of the regenerated catalysts was not presented. However, Skutil et al [124] showed that catalysts regenerated in either air or 1% O 2 /N 2 were found to exhibit lower methane conversion and benzene yield, and even lost their activity faster than fresh catalysts [125].…”

Section: Catalyst Deactivation and Regenerationmentioning

confidence: 99%

“…They further showed that Mo-zeolite catalyst was dramatically stabilized by co-addition of both 5.4% H 2 and 1.8% H 2 O to methane feed, compared with the addition of either H 2 or steam alone. Both Taniewski et al [124] and Tan et al [219] concluded that H 2 enhances the stability of the catalyst by preventing excessive dehydrogenation of reaction intermediates.…”

Section: Boudouard Reaction and Methane Reformingmentioning

confidence: 99%

“…These products serve as scavengers to remove coke formed during MDA reaction via a reverse Boudouard reaction, as well as the water-gas shift reaction. Subsequently, Taniewski et al [124] also reported single-pass coupling using Na/CaO as OCM catalyst and 4.5%Mo/HZSM-5 as aromatization catalyst, although almost no aromatic products were observed. This could have been due to the presence of relatively large amounts of CO 2 and H 2 O formed over OCM catalyst which cause deactivation of aromatization catalyst.…”

Section: Oxidative Coupling Of Methane (Ocm)mentioning

confidence: 99%

See 2 more Smart Citations

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Guo

Zhao

et al. 2013

Journal of Energy Chemistry

227

183

View full text Add to dashboard Cite

Section: Catalyst Deactivation and Regenerationmentioning

confidence: 99%

Section: Boudouard Reaction and Methane Reformingmentioning

confidence: 99%

Section: Oxidative Coupling Of Methane (Ocm)mentioning

confidence: 99%

See 1 more Smart Citation

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Guo

Zhao

et al. 2013

Journal of Energy Chemistry

227

183

View full text Add to dashboard Cite

“…Up to now, most a ention was devoted to the integration of the OCM process with dry and steam reforming of methane [2,[4][5][6][7][8][9]. Several other possibilities for the integration of OCM with aromatization [10][11][12], benzene alkylation [13], pyrolysis [14], conversion to acetic acid and/or ethanol [15], synthesis Fischer-Tropscha [16], oxidative dehydrogenation of ethane [12,[17][18][19], methanation of CO x [20,21] were also explored.…”

Section: Introductionmentioning

confidence: 99%

Study of oxidative coupling of methane integrated with CO oxidation

Michorczyk¹,

Hędrzak²

2017

View full text Add to dashboard Cite

In this work, the process of OCM carried out over Mn-Na 2 WO 4 /SiO 2 integrated with selective oxidation over Ag/support was investigated. the e ect of feed gas composition and OCM bed temperature as well as the position of Ag/support bed and additional oxygen injection before this bed were investigated. At optimal OCM conditions for the Mn-Na 2 WO 4 /SiO 2 catalyst (CH 4 /O 2 = 3.75; V tot = 77 cm 3 /min; T = 780°C), the injection of additional 4 cm 3 /min of oxygen into the bed of Ag/support (working at 250-300°C) leads to a preferential oxidation of CO to CO 2 .Keywords: oxidative coupling of methane, integration with oxidation, ethylene, silver catalyst Streszczenie W pracy zbadano proces OCM w obecności Mn-Na 2 WO 4 /SiO 2 zintegrowany w jednym reaktorze z procesem selektywnego utleniania CO prowadzonym na katalizatorze Ag/nośnik. Zbadano wpływ zmiany parametrów prowadzenia procesu OCM, takich jak skład surowca i temperatury oraz efekt dodatku tlenu nad złoże Ag/nośnik. Wykazano, że w optymalnej temperaturze pracy złoża OCM (CH 4 /O 2 = 3,75; V cał. = 77 cm 3 / min; T = 780°C) wprowadzenie dodatkowo 4 cm 3 /min tlenu nad złoże Ag/nośnik (pracującego w temp. 250-300°C) prowadzi do preferencyjnego utleniania CO do CO 2 .Słowa kluczowe: utleniające sprzęganie metanu, integracja z utlenianiem, etylen, katalizatory srebrowe

show abstract

“…Indeed, catalyst instability has been found to be one of the most detrimental factors hindering large-scale implementation of the most attractive process proposals. [46][47][48] We therefore investigated an alternative system that should overcome the problems of carbon loss and long-term catalyst stability. A completely oxide-, oxygen-or water-free Lewis-acidassisted conversion of methyl bromide into light hydrocarbons fulfils these requirements and offers an integrated methane conversion process.…”

Section: Introductionmentioning

confidence: 99%

Direct Coupling of Bromine‐Mediated Methane Activation and Carbon‐Deposit Gasification

Osterwalder¹,

Stark²

2007

ChemPhysChem

View full text Add to dashboard Cite

The direct bromination of methane offers a quite selective (>98 %) route towards methane activation but shifts the problem of fuel production to converting and handling corrosive methyl bromide. The direct conversion of methyl bromide, at about 200 degrees C, into light hydrocarbons can be catalyzed under pressure by AlBr(3) resulting in the formation of propane-rich mixtures of light hydrocarbons, carbonaceous deposits, and HBr. After releasing the gaseous products, the addition of hydrogen at 260 degrees C allows a quantitative conversion of the carbonaceous deposits into the same range of light hydrocarbons. These second-stage products efficiently contribute to the overall process yield while enabling a full regeneration of the catalyst's activity. This oxygen-free process is compared to the conversion of methyl bromide on zeolites and the currently used methanol-to-gasoline (MTG) process in terms of product distributions and apparent energy of activation. A detailed chemical analysis of the intermediates revealed the presence of a carbon pool consisting of highly substituted benzene and cyclopentadiene derivatives, as observed on zeolites used in the MTG process. This similarity suggests that the currently used oxygen-based syngas/MTG process for methane conversion may be extended to a bromine-mediated process by using methyl bromide as an intermediate instead of methanol.

show abstract

Some technological aspects of methane aromatization (direct and via oxidative coupling)

Cited by 70 publications

References 16 publications

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Study of oxidative coupling of methane integrated with CO oxidation

Direct Coupling of Bromine‐Mediated Methane Activation and Carbon‐Deposit Gasification

Contact Info

Product

Resources

About