Standardization of catalyst preparation using reference catalyst: ion exchange of mordenite type zeolite

Katada, Naonobu; Takeguchi, Tatsuya; Suzuki, Tatsuya; Fukushima, T.; Inagaki, Kinya; Tokunaga, Setsuo; Shimada, Hiromichi; Sato, Koichi; Oumi, Yasunori; Sano, Tsuneji; Segawa, Kohichi; Nakai, Kenta; Shoji, Hiroshi; Wu, Peng; Tatsumi, Takashi; Komatsu, Takayuki; Masuda, Toshio; Domen, Kazunari; Yoda, Eisuke; Kondo, Junko N.; Okuhara, Toshio; Kageyama, Yasuyoshi; Niwa, Miki; Ogura, Masaru; Matsukata, Masahiko; Kikuchi, Eiichi; Okazaki, Noriyasu; Takahashi, Motoi; Tada, Akio; Tawada, Shogo; Kubota, Yoshihiro; Sugi, Yoshihiro; Higashio, Yasuhiko; Kamada, Masahiko; Kioka, Yukiyo; Yamamoto, Kohei; Shouji, Takayuki; Arima, Yusaku; Okamoto, Yasuaki; Matsumoto, Hideyuki

doi:10.1016/j.apcata.2004.12.036

Cited by 17 publications

(1 citation statement)

References 57 publications

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“…This technique is used to locate Brønsted acid sites in H-MOR. We expect that the Al distribution in Na-MOR is the same as in H-MOR, as H-MOR is usually obtained by exchanging Na + with H + …”

Section: Resultsmentioning

confidence: 95%

Adsorption and Diffusion of Alkanes in Na-MOR: Modeling the Effect of the Aluminum Distribution

Ban

Vlugt

2009

J. Chem. Theory Comput.

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We investigated the adsorption and the diffusion of alkanes in the sodium-exchanged zeolite Mordenite (Na-MOR) using molecular simulations. MOR-type zeolite consists of main channels (6.5 × 7 Å) oriented along the z crystallographic axis that are connected to small side pockets (3.4 × 4.8 Å). It is well-known that the adsorption of alkanes in Na-MOR strongly depends on the precise location of the framework Al atoms either in the main channel or the side pockets (Calero and co-workers, Angew. Chem. Int. Ed. 2007, 46, 276). We found that this effect can be characterized by a single-order parameter: the number of framework Al in the main channel divided by the number of framework Al in the side pocket (M/S ratio). For any M/S ratio, the adsorption isotherm follows from a linear interpolation between the reference isotherms. This enabled us to predict adsorption isotherms for any distribution of the Al framework atoms or estimate the M/S ratio for a given isotherm. We found that the same model can predict the effect of the M/S ratio on the self-diffusion coefficient, the Maxwell-Stefan diffusion coefficient, and the accessible micropore volume.

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Section: Resultsmentioning

confidence: 95%

Adsorption and Diffusion of Alkanes in Na-MOR: Modeling the Effect of the Aluminum Distribution

Ban

Vlugt

2009

J. Chem. Theory Comput.

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para-Selectivity of silicalite-1 coated MFI type galloaluminosilicate in aromatization of light alkanes

et al. 2015

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MFI type galloaluminosilicates (GaAlMFI) were coated with inert silicalite-1 layers. The silicalite-1 coating could improve the para-selectivity for xylene production in aromatization of propane. In the silicalite-1 coating step, low alkali concentration in the synthesis solution enhanced para-selectivity. A proton-exchange procedure also had an impact on the para-selectivity. Significant decrease of para-selectivity was observed over the silicalite-1 coated GaAlMFI with repeated proton-exchange. From the 71 Ga and 27 Al MAS NMR measurements, demetalation occurred during the proton-exchange process, and those metal species is likely to become catalytically active sites without para-selectivity. From the aromatization of propane and n-butane, para-selectivity in n-butane aromatization was found to be higher than that in propane aromatization. From the product distribution, naphthalene and its derivatives were easier to be produced in propane aromatization compared to n-butane aromatization. The formation of naphthalene and its derivatives may relate to decrease in the para-selectivity in propane aromatization.

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