Two practical equations for methanol dehydration reaction over HZSM-5 catalyst – Part I: Second order rate equation

Tavan, Yadollah; Hasanvandian, Reza

doi:10.1016/j.fuel.2014.10.078

Cited by 11 publications

(11 citation statements)

References 12 publications

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“…The P−OH groups of these phosphate groups (as in (CO) 2 −PO 2 , C−PO 2 −O−C, and/or C 2 −PO 2 ), conferred to the carbon-surface Bronsted acid sites, which were of primary importance in the acid character of these type of activated carbon catalysts for 2-butanol 30 and isopropanol 20 dehydration reactions. The total acidity obtained for ACP2800 is significantly lower than that obtained also from NH 3 -TPD, by conventional catalysts for the decomposition of methanol, such as HZSM-5 (Si/Al = 25) 17,42 and Al 2 O 3 43 with values about 1000 and between 227 and 608 μmol/g, respectively.…”

Section: Resultsmentioning

confidence: 67%

Phosphorus-Containing Mesoporous Carbon Acid Catalyst for Methanol Dehydration to Dimethyl Ether

Valero-Romero

Calvo-Muñoz

Ruiz-Rosas

et al. 2019

Ind. Eng. Chem. Res.

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Catalytic dehydration of methanol on an acid carbon catalyst prepared by chemical activation of olive stone with H3PO4 is reported. This preparation methodology produces carbons with a well-developed porous texture and highly thermally stable phosphorus surface complexes in the forms of C–O–PO3 and C–PO3. These P groups confer the carbon with a high oxidation resistance, surface acid, and redox sites. In the absence of oxygen, the catalyst experiment demonstrated a gradual deactivation due to coke deposition on the strong acid sites (P–OH) and reduction of the moderate-strength acid P-surface groups (from C–O–P to C–P type ones). The novelty of this research concerns the high catalytic stability in air atmosphere of this type of carbon with a steady-state methanol conversion of 20% at 300 °C and selectivity towards dimethyl ether of 95%. The presence of oxygen in the reaction gas avoids coke deposition by continuous (re)oxidation of reduced P-surface groups, without gasification of the carbon catalyst.

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Section: Resultsmentioning

confidence: 67%

Phosphorus-Containing Mesoporous Carbon Acid Catalyst for Methanol Dehydration to Dimethyl Ether

Valero-Romero

Calvo-Muñoz

Ruiz-Rosas

et al. 2019

Ind. Eng. Chem. Res.

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“…In the high temperature range, i.e., above 600 K, the correlations of Tavan and Hasanvandian [113] and Diep and Wainwright [111] also yield satisfying results (see Equations (9) and (10), respectively):…”

Section: Thermodynamicsmentioning

confidence: 76%

“…3. Equilibrium constants for the system methanol/DME/water, taken from different references [109][110][111][112][113] and compared with our own solution according to Figure 1, as a function of temperature: (a) with a regular scale; and (b) with a logarithmic scale. Figure 3 shows that only the correlation published by Aguayo et al [109] closely matches the solution derived from thermodynamics.…”

Section: Thermodynamicsmentioning

confidence: 99%

Kinetic Modeling of Catalytic Olefin Cracking and Methanol-to-Olefins (MTO) over Zeolites: A Review

Hinrichsen

2018

Catalysts

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The increasing demand for lower olefins requires new production routes besides steam cracking and fluid catalytic cracking (FCC). Furthermore, less energy consumption, more flexibility in feed and a higher influence on the product distribution are necessary. In this context, catalytic olefin cracking and methanol-to-olefins (MTO) gain in importance. Here, the undesired higher olefins can be catalytically converted and, for methanol, the possibility of a green synthesis route exists. Kinetic modeling of these processes is a helpful tool in understanding the reactivity and finding optimum operating points; however, it is also challenging because reaction networks for hydrocarbon interconversion are rather complex. This review analyzes different deterministic kinetic models published in the literature since 2000. After a presentation of the underlying chemistry and thermodynamics, the models are compared in terms of catalysts, reaction setups and operating conditions. Furthermore, the modeling methodology is shown; both lumped and microkinetic approaches can be found. Despite ZSM-5 being the most widely used catalyst for these processes, other catalysts such as SAPO-34, SAPO-18 and ZSM-23 are also discussed here. Finally, some general as well as reaction-specific recommendations for future work on modeling of complex reaction networks are given.

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“…Reversible second-order equations were used for DME synthesis reaction [48]. For the hydrocarbon synthesis step, our previous data [24] were fitted to obtain the lumped kinetic constant k 2.…”

Section: Reactor Design and Reaction Kineticsmentioning

confidence: 99%

Design of a Compact Microreactor/Heat-Exchanger for a Distributed Production of Liquid Hydrocarbons from Methanol

Cherkasov

Rebrov

2021

Reactions

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The paper compares conceptual designs of a microstructured reactor/heat-exchanger for the small-scale production of C8+ range hydrocarbons from methanol over H-ZSM-5 catalytic coatings. In these designs, air was used as a cooling fluid in the adjacent cooling channels. The heat transfer characteristics of a single-zone reactor (with channels 500 μm in diameter) and a two-zone reactor (with an additional coolant inlet) have been compared. A single reaction zone was not able to reduce the temperature gradient below 15 K, while a two-zone configuration, with a counter-current fluid flow in the upstream section and co-current flow in the downstream section, demonstrated a near-isothermal behaviour, with a mean temperature of 653 K.

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Two practical equations for methanol dehydration reaction over HZSM-5 catalyst – Part I: Second order rate equation

Cited by 11 publications

References 12 publications

Phosphorus-Containing Mesoporous Carbon Acid Catalyst for Methanol Dehydration to Dimethyl Ether

Phosphorus-Containing Mesoporous Carbon Acid Catalyst for Methanol Dehydration to Dimethyl Ether

Kinetic Modeling of Catalytic Olefin Cracking and Methanol-to-Olefins (MTO) over Zeolites: A Review

Design of a Compact Microreactor/Heat-Exchanger for a Distributed Production of Liquid Hydrocarbons from Methanol

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