Oxidation of methane to methanol and formaldehyde over Co–ZSM-5 molecular sieves: Tuning the reactivity and selectivity by alkaline and acid treatments of the zeolite ZSM-5 agglomerates

Beznis, Nadzeya V.; Laak, Adri N.C. van; Weckhuysen, Bert M.; Bitter, Johannes H.

doi:10.1016/j.micromeso.2010.09.009

Cited by 104 publications

(67 citation statements)

References 51 publications

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“…Figure 4, scanning electron micrographs of parent and desilicated zeolite Beta and ZSM-5, show the corroded edges of the crystals treated with alkalis as also had been reported by Beznis et al [19] This indicates that mesopore formation initiates preferentially at the boundaries of zeolite crystals [20]. Further, one may suggest that increased mesoporosity observed might be due to corroded edges leading to increased inter-crystalline mersoporosity also [19]. In fact, Beznis et al [19] had observed an average meso-pore diameter of 30 nm with zeolite crystal size of 20-100 nm.…”

Section: Catalytic Testsupporting

confidence: 73%

“…Further, one may suggest that increased mesoporosity observed might be due to corroded edges leading to increased inter-crystalline mersoporosity also [19]. In fact, Beznis et al [19] had observed an average meso-pore diameter of 30 nm with zeolite crystal size of 20-100 nm. Due to comparable crystal-and poresizes, the mesoporosity generated by them had been suggested to be of inter-crystal in nature.…”

Section: Catalytic Testmentioning

confidence: 95%

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Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

et al. 2011

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Catalytic performance of Pt impregnated parent and desilicated nano-crystalline zeolites, ZSM-5 and Beta for n-hexane isomerization was studied. Difference in channel systems of the zeolites and absence/presence of mesopores therein were found to be reflected in product distributions. ZSM-5 was desilicated by NaOH and zeolite Beta with tetramethylammonium hydroxide (TMAOH.) Desilication was found to afford comparable catalytic performance to that of the parent counterpart at reaction temperature lower by 25°C. Observed product distributions could be substantiated with characterizations such as ammonia TPD, surface area determination and SEM. Desilicated zeolite Beta was seen to be less prone to coking as deduced from the TGA study. Location of Pt with reference to proton sites within the channels and that inside the pores viz a viz external surface also have been discussed briefly.

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Section: Catalytic Testsupporting

confidence: 73%

Section: Catalytic Testmentioning

confidence: 95%

Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

et al. 2011

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“…[186] Somit führte dieses Gasgemisch zu einer erhebli- [187] wurde in einem Chemical-Looping-Modus analog zum System mit Kupferkatalysatoren bestimmt. [188] Diese Befunde sind relevant fürd ie Entwicklung eines methanolselektiven DMTM-Verfahrens,d as hohe Ausbeuten liefert, da sowohl die Ausbeute als auch die Selektivitätv on einer grçßeren Außenoberfläche des Materials profitieren. Dies ergänzt eine frühere Untersuchung,b ei der eine Veränderung der Mikround Mesoporositätv on Co-ZSM-5 die selektive Oxidation von Methan zu Methanol beeinflusste.…”

Section: Methanoxidation Mit Eisen-haltigen Zeolithenunclassified

Die direkte katalytische Oxidation von Methan zu Methanol – eine kritische Beurteilung

2017

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Es gibt vielzählige direkte, selektive Ansätze, um Methan partiell zu oxidieren, jedoch ist noch keiner von ihnen zur industriellen Reife gelangt. In diesem Zusammenhang ist die Oxidation von Methan zu Methanol eine schwierige, aber lohnende Aufgabe, da sie eine wirkungsvolle Methode ist, um das Abfackeln von Erdgas, das als Nebenprodukt in der Erdölindustrie anfällt, zu unterbinden, und zugleich die Möglichkeit bietet, Methan zu valorisieren. Dieser Aufsatz berücksichtigt die Synthese von Methanol und seinen Derivaten ausgehend von Methan durch homogen‐ und heterogenkatalytische Methoden. Er zeigt die starken Einschränkungen der direkten katalytischen Synthese von Methanol aus Methan auf und unterstreicht dabei die enorme Überlegenheit von Systemen, die Methanolderivate produzieren oder sich durch Besonderheiten wie die Verwendung von Mehrkomponenten‐Katalysatoren zur Methanolstabilisierung auszeichnen. Für die zukünftige Forschung erweist sich die Stabilisierung von Methanol in der homogenen und heterogenen Katalyse als unentbehrlich.

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“…Other researchers have studied other methods for formaldehyde production. Some recent studies (Beznis et al 2011, Polnišer et al 2011, Carlsson et al 2012, Wang et al 2012, Zhang et al 2012a have targeted the methane reactivity and the selectivity toward formaldehyde production in the process of direct oxidation of methane to formaldehyde. Exposing the reactants to nitrogen oxide using low residence time (Zhang et al 2012a,b), using periodic operating conditions (Carlsson et al 2012), and using copper-iron pyrophosphate as the catalyst (Polnišer et al 2011) were suggested.…”

Section: Latest Advancements In Formaldehyde Productionmentioning

confidence: 99%

Critical review and exergy analysis of formaldehyde production processes

Bahmanpour

Hoadley

Tanksale

2014

Reviews in Chemical Engineering

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AbstractFormaldehyde is one of the most important intermediate chemicals and has been produced industrially since 1889. Formaldehyde is a key feedstock in several industries like resins, polymers, adhesives, and paints, making it one of the most valuable chemicals in the world. However, not many studies have been dedicated to reviewing the production of this economically important product. In this review paper, we study the leading commercial processes for formaldehyde production and compare them with recent advancements in catalysis and novel processes. This paper compares, in extensive detail, the reaction mechanisms and kinetics of water ballast process (or BASF process), methanol ballast process, and Formox process. The thermodynamics of the reactions involved in the formaldehyde production process was investigated using HSC Chemistry™ software (Outotec Oyj, Espoo, Finland). Exergy analysis was carried out for the natural gas to methanol process and the methanol ballast process for formaldehyde production. The former process was simulated using Aspen HYSYS™ and the latter using Aspen Plus™ software (Aspen technology, Burlington, MA, USA). The yield and product specifications from the simulation results closely matched with published experimental data. The exergy efficiencies of the natural gas to synthesis gas

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Oxidation of methane to methanol and formaldehyde over Co–ZSM-5 molecular sieves: Tuning the reactivity and selectivity by alkaline and acid treatments of the zeolite ZSM-5 agglomerates

Cited by 104 publications

References 51 publications

Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization

Die direkte katalytische Oxidation von Methan zu Methanol – eine kritische Beurteilung

Critical review and exergy analysis of formaldehyde production processes

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