Gas chromatographic determination of the paraffin and naphthene content in saturated hydrocarbon distillates with porous layer open tubular columns of molecular sieve 13X

Soulages, Nestor L.; Brieva, A.M.

doi:10.1016/s0021-9673(00)82853-8

Cited by 16 publications

(1 citation statement)

References 13 publications

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“…If the catalytically active sites of such microporous catalysts are located on the surface of a cellular structure, the educts have direct access without intrapore diffusion and without undesired catalytic influence of any binder material. Zeolite coatings have been reported to be anchored on a c-Al 2 O 3 foam surface by wash coating [26][27][28][29] or by binderless in situ synthesis on a silicon carbide foam substrate. 7 In these manufacturing procedures the ceramic foam support is considered to be inert under zeolite synthesis conditions.…”

Section: Introductionmentioning

confidence: 99%

Zeolite covered polymer derived ceramic foams: novel hierarchical pore systems for sorption and catalysis

Scheffler¹,

Zampieri²,

Schwieger³

et al. 2005

Advances in Applied Ceramics

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Open cell polymer derived ceramic foams were prepared by a self-foaming process of a filler loaded poly(silsesquioxane) and subsequent pyrolysis at 1000uC in nitrogen atmosphere. A 1 : 1 mixture by weight of elemental Si and SiC was introduced as particulate filler. Foam samples without and with addition of a small amount (1 . 5 wt-% ) of Cu 2 O were prepared. Open cell ceramic foams with average cell diameter of 0 . 5-1 . 5 mm, compressive strength of up to 3 MPa and porosity of up to 90% were used as supports for direct crystallisation of MFI type zeolite under partial dissolution/recrystallisation of the ceramic foam. The partial transformation of the Si-O-C based foam material by hydrothermal crystallisation at 150uC for 0-96 h resulted in a well distributed zeolite coating with excellent adhesion on the foam surface. Characterisation of the zeolite/ceramic foam composites was carried out by XRD measurements in order to determine the amount of zeolite in the composite. 29 Si MAS NMR experiments were conducted to investigate the influence of Cu 2 O addition on the crystallisation behaviour.

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Section: Introductionmentioning

confidence: 99%

Zeolite covered polymer derived ceramic foams: novel hierarchical pore systems for sorption and catalysis

Scheffler¹,

Zampieri²,

Schwieger³

et al. 2005

Advances in Applied Ceramics

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Modified Gas‐Solid Chromatography

Berezkin¹,

Zeeuw²

1996

Capillary Gas Adsorption Chromatography

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Modified Gas-Solid ChromatographyThe solution of many difficult analytical problems of practical importance and the development of gas-solid chromatography can be achieved, in our opinion, by using modified gas-solid chromatography. Modified gas-solid chromatography is a variant of gas chromatography which uses an adsorbent covered by stable (under the experimental conditions) continuous or island-type layer of organic or inorganic volatile or involatile compounds, whose presence modifies the chemical or structural composition of the adsorbent surface, thus changing the nature and intensity of molecular interactions taking place between different analytes and the surface of the adsorbent. Fig. 5-1 shows the main variants of modified gas-solid chromatography. Of course, hybrid modified chromatography set-ups are some-times also useful (for example, simultaneous operation of both variant II and variant IV).In one of the versions of modified gas-solid chromatography, adsorbents covered by a stable layer of organic or inorganic compounds are used. The presence of modifier changes the chemical composition of the adsorbent surface and therefore the nature and intensity of molecular interactions taking place between the modified surface and the various analytes of a mixture under study. As a result, the adsorption energy of each component of the mixture usually decreases, permitting use of sorbent material at a much lower temperature. The selectivity of the modified stationary phase increases concomitantly. Finally, by changing the nature of the modifying compound and its surface concentration, it is possible to change the absolute and relative retention over a wide range. Capillary Gas Adsorption Chromatography

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Preparation of Adsorbent Layer Open Tubular Columns

Berezkin¹,

Zeeuw²

1996

Capillary Gas Adsorption Chromatography

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Gas chromatographic determination of the paraffin and naphthene content in saturated hydrocarbon distillates with porous layer open tubular columns of molecular sieve 13X

Cited by 16 publications

References 13 publications

Zeolite covered polymer derived ceramic foams: novel hierarchical pore systems for sorption and catalysis

Zeolite covered polymer derived ceramic foams: novel hierarchical pore systems for sorption and catalysis

Modified Gas‐Solid Chromatography

Preparation of Adsorbent Layer Open Tubular Columns

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