A priori selection of shape-selective zeolite catalysts for the synthesis of 2,6-dimethylnaphthalene

Millini, Roberto; Frigerio, Francesco; Bellussi, Giuseppe; Pazzuconi, G.; Perego, Carlo; Pollesel, Paolo; Romano, U.

doi:10.1016/s0021-9517(03)00071-x

Cited by 94 publications

(52 citation statements)

References 34 publications

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“…Figure 3 shows the variation of the calculated adsorption selectivities with temperature. Interestingly, it was found that the selectivities increase with the Millini et al (2003). increase in the temperature and decrease with the temperature higher than 160 • C. This result could be explained by the improvement on both the DMNs diffusion and the diffusion rate by thermal energy as previously discussed.…”

Section: Figsupporting

confidence: 57%

“…All in all, it seems that the adsorption of the DMNs on NaY is controlled by the molecular diffusion, called as the rate-selective mechanism. However, it was observed that the elution order of the DMNs does not agree well with that of the calculated barrier energy of diffusion through FAU (Millini et al, 2003) as listed in Table 2. Generally, the molecule that has the lowest diffusion energy would deliberately diffuse through the zeolite pore slower than that with the higher diffusion energy resulting in the higher NRV as observed in the cases of n-paraffins adsorption (De Meyer et al, 2003;Wei, 1994;Gorring, 1973).…”

Section: Figmentioning

confidence: 87%

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Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

2006

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Adsorption of the equilibrium mixture of 1,5-, 1,6-and 2,6-dimethylnaphthalene (DMN) was investigated on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites using pulse test and breakthrough techniques. It was found that the adsorption of the DMNs would proceed through a complex mechanism governing by at least molecular diffusion, acid-base interaction, preferential interaction with cation and molecular displacement. All ion-exchanged faujasite zeolites only provided rejective systems for 2,6-DMN and some of them were potential adsorbents for the 2,6-DMN purification.

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Section: Figsupporting

confidence: 57%

Section: Figmentioning

confidence: 87%

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

2006

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“…It is known that this larger poly-aromatic has very slow diffusion in ZSM-5 [22] and therefore, it might be speculated that naphthalene is not formed within the pores. However, naphthalene has a sufficiently small kinetic diameter (*6.2 Å ) to fit within the ZSM-5 pore (*6.2 Å with Norman radii adjustment [23]), and furthermore at the elevated reaction temperature (600°C), the energetic barrier to diffusion will be decreased.…”

Section: Chemistry Of Catalytic Fast Pyrolysismentioning

confidence: 99%

Aromatic Production from Catalytic Fast Pyrolysis of Biomass-Derived Feedstocks

et al. 2009

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The conversion of biomass compounds to aromatics by thermal decomposition in the presence of catalysts was investigated using a pyroprobe analytical pyrolyzer. The first step in this process is the thermal decomposition of the biomass to smaller oxygenates that then enter the catalysts pores where they are converted to CO, CO 2 , water, coke and volatile aromatics. The desired reaction is the conversion of biomass into aromatics, CO 2 and water with the undesired products being coke and water. Both the reaction conditions and catalyst properties are critical in maximizing the desired product selectivity. High heating rates and high catalyst to feed ratio favor aromatic production over coke formation. Aromatics with carbon yields in excess of 30 molar carbon% were obtained from glucose, xylitol, cellobiose, and cellulose with ZSM-5 (Si/Al = 60) at the optimal reactor conditions. The aromatic yield for all the products was similar suggesting that all of these biomass-derived oxygenates go through a common intermediate. At lower catalyst to feed ratios volatile oxygenates are formed including furan type compounds, acetic acid and hydroxyacetaldehyde. The product selectivity is dependent on both the size of the catalyst pores and the nature of the active sites. Five catalysts were tested including ZSM-5, silicalite, beta, Y-zeolite and silica-alumina. ZSM-5 had the highest aromatic yields (30% carbon yield) and the least amount of coke.

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“…Millini and Perego reported that the energy barrier for α,β-DMN formation within the pores of MTW-type zeolite and it was assumed that it is quite difficult for α,β-DMN to diffuse inside the pores 3) . Therefore, it is considered that the β,β-DMN produced isomerizes into α,β-DMN on the outer surface of the zeolite because the 2,6-DMN/1,6-DMN ratio decreased over Al-MTW with higher a Si/Al ratio, as shown in Fig.…”

Section: Methylation Of 2-mn Over Mtw Zeolites With Different Acidmentioning

confidence: 99%

Mtw型ゼオライト構造を有するアルミノシリケートおよびフェリシリケートを用いた2-メチルナフタレンのメチル化反応とその速度解析

Watanabe

Nakasaka

Masuda

2017

J. Jpn. Petrol. Inst.

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Aluminosilicate and ferrisilicate with the MTW-type zeolite structure were hydrothermally prepared and used to catalyze the methylation of 2-methylnaphthalene (2-MN) under supercritical conditions in a batch-type reactor. Dimethylnaphthalene (DMN) and 1-methylnaphthalene (1-MN) yields increased with decreasing Si/Al ratio of the zeolite. In contrast, ferrisilicate with the MTW-type zeolite structure (Si/Fe 100) exhibited higher DMN selectivity and the β,β-DMN fraction in total DMNs was higher than that over aluminosilicate with MTW structure (Si/ Al 100). Kinetic analysis of 2-MN methylation over MTW zeolites was conducted, to obtain the reaction rate constants and apparent activation energies. The activation energy for the methylation of 2-MN over aluminosilicate with MTW structure was 176 kJ mol -1 , which was almost the same as that for the ferrisilicate with MTW structure. This indicates that the mechanism for methylation is independent of hetero-atoms species in the MTW zeolite framework. The introduction of Fe atoms into the framework significantly decreased the rate constant for the isomerization of 2-MN compared with that for the methylation of 2-MN. Therefore, ferrisilicate with MTW structure is effective for 2-MN methylation due to the decrease of the isomerization rate.

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A priori selection of shape-selective zeolite catalysts for the synthesis of 2,6-dimethylnaphthalene

Cited by 94 publications

References 34 publications

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

Study on the adsorption of 1,5-, 1,6- and 2,6-dimethylnaphthalene on a series of alkaline and alkaline earth ion-exchanged faujasite zeolites

Aromatic Production from Catalytic Fast Pyrolysis of Biomass-Derived Feedstocks

Mtw型ゼオライト構造を有するアルミノシリケートおよびフェリシリケートを用いた2-メチルナフタレンのメチル化反応とその速度解析

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