Hexane—carbon dioxide reaction catalyzed by alkaline earth metal oxides

Matsukata, Masahiko; Sekine, Satoshi; Kobayashi, Kenichiro; Kikuchi, Eiichi; Morita, Yoshiro

doi:10.1016/s0166-9834(00)80392-9

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…2H,(,, + C(s) <===> CH4(,) magnesium oxide can be ascribed to the low catalytic activity of MgO for gasifmg the carbonaceous materials (Matsukata et al, 1988). Thus, dolomites and quicklime are more effective catalysts for this reaction, with the conditions of these experiments, than dolomitic magnesium oxide.…”

Section: Catalytic Steam Pyrolysismentioning

confidence: 78%

Catalytic steam pyrolysis of a selected saturated hydrocarbon on calcined mineral particles

Taralas

1998

Can J Chem Eng

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At a total pressure of 101.3 kPa, and in the presence of water vapor (PH20 = 32 Ha), the impact of commercially available Norwegian and Swedish quarried mineral rocks on the gaseous product yields and selectivities generated during the catalytic steam pyrolysis of n-heptane (Pn-C7H,6 = 2.9-4.7 kPa) in the intermediate temperature range of 973-1073 K and GHSV 1200-4000 h-' was investigated. The results indicate that the choice of calcined mineral particles as the bed material influences the product distribution of alkenes. In particular, calcined dolomites [CaMg(0)2] suppressed the evolution of unsaturated and aromatic hydrocarbon species; however, the formation of ethylene (C2H4) was correlated. A LangmuirHinshelwood mechanism has also been proposed to describe the rate equation of the vapor-phase steam pyrolysis of nheptane on calcined dolomite at 973 K.On a etudie, a une pression totale de 101,3 kPa et en presence de vapeur d'eau ( P H~~ = 32 kPa), l'impact de roches minerales de carrieres norvegiennes et suedoises, sur les rendements de produits gazeux et les selectivites generees au cours de la pyrolyse a la vapeur catalytique du n-heptane (P.-c-~,~ = 2,9-4,7 kPa) dans la gamme de temperatures intermediaires de 973-1073 K et un GHSV de 1200-1400 h-'. Les resultats indiquent que le choix de particules minerales calcinees comme materiau de lit influence la distribution de produits des alcenes. En particulier, les dolomites calcinees [CaMg(0)2] suppriment I'evolution d'especes d'hydrocarbures aromatiques et non satures; toutefois, la formation d'ethylene (C2H4) a ete correlee. On propose egalement un mecanisme de Langmuir-Hinshelwood pour decrire l'equation de vitesse de la pyrolyse a la vapeur du n-heptane en phase vapeur sur la dolomite calcinee a 973 K.Keywords: calcined dolomite, CaO, limestone, MgO, steam pyrolysis, n-heptane. evelopment of thermal gasification technologies has D enabled a significant increase of the utilization of biomass (foresty and agricultural residues) including municipal solid waste or parts of it, RDF, and desified digested sewage sludges in energy production (Nilsson, 1995). Thermal gasification of biomass produces permanent gas ( e g , H,, CO, CO,, CH,) which is withdrawn from the gasification reactorzone and subjected to a cleaning operation to rid the flue gas of various contaminants (tar, VOC, particulates in the form of carbon, dust, ash, alkali trace metals, etc). Tar mitigation in the flue gas has been one of the key processes in biomass gasification in the last 20 years due to plugging of downstream equipment from tar condensation (Taralas, 1988;Taralas and Koukios, 1996). The basic idea in processing tm elimination is to benefit from the chemical energy of the he1 gas that includes the tar conversion into H2, CH, and lighter hydrocarbons (Sjostrom et al., 1988; Rensfelt and Ekstrom, 1989).There exists a significant amount of literature on tar cracking and sulphur absorption on dolomite and related carbonate mineral materials practicing gasification engineering of fossil (...

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Section: Catalytic Steam Pyrolysismentioning

confidence: 78%

Catalytic steam pyrolysis of a selected saturated hydrocarbon on calcined mineral particles

Taralas

1998

Can J Chem Eng

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Assessment of Performance and Deactivation Resistance of Catalysts in the Pyrolysis of Polyethylene and Post‐Consumer Polyolefin Waste

Mesquita,

Pinto,

Pacheco

2024

Macro Reaction Engineering

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In the present work, the catalyst performances of USY and REY zeolites and MgO, ZnO and MgxAlOy oxides were investigated in the pyrolysis of virgin high‐density polyethylene (HDPE) and of post‐consumer polyolefin waste. The influence of operation parameters and catalyst deactivation resistance over four reaction cycles were evaluated. The results indicated that basic oxides did not show relevant cracking activity, so that the only identified effect for these catalysts was the production of liquid products with higher contents of paraffins, when compared to thermal pyrolysis. Among the evaluated oxides, MgxAlOy was the most active and resistant to deactivation. The zeolites promoted cracking and secondary reactions of isomerization, cyclization, and aromatization. Particularly, USY promoted the production of higher quality oils and showed higher deactivation resistance, when compared to REY. Additionally, significant loss of catalyst activity was identified in reactions conducted with post‐consumer polyolefin wastes. However, increase of rates of coke formation and presence of contaminants (such as halogens and metals) were not detected in the catalysts after the reactions.This article is protected by copyright. All rights reserved

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Effects of feedstock on co-pyrolysis of biomass and coal in a free-fall reactor

Wei

Zhang

2011

Journal of Fuel Chemistry and Technology

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Hexane—carbon dioxide reaction catalyzed by alkaline earth metal oxides

Cited by 3 publications

References 16 publications

Catalytic steam pyrolysis of a selected saturated hydrocarbon on calcined mineral particles

Catalytic steam pyrolysis of a selected saturated hydrocarbon on calcined mineral particles

Assessment of Performance and Deactivation Resistance of Catalysts in the Pyrolysis of Polyethylene and Post‐Consumer Polyolefin Waste

Effects of feedstock on co-pyrolysis of biomass and coal in a free-fall reactor

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