Comparison of microporous MFI and dense Pd membrane performances in an extractor-type CMR

Dyk, L. Van; Miachon, S.; Lorenzen, L.; Torres, M.; Fiaty, Koffi; Dalmon, J.A.

doi:10.1016/s0920-5861(03)00229-3

Cited by 38 publications

(19 citation statements)

References 14 publications

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“…This has been seen for hydrogen extraction in CMR experiments with similar membranes as used in this study [28]. With a decrease in sweep flow rate from 10 to 7 ml/min a small decrease in para-xylene permeance is observed.…”

Section: Discussionsupporting

confidence: 73%

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Xylene isomerization in an extractor type catalytic membrane reactor

et al. 2005

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A zeolite / alumina pore plugging membrane was used to successfully separate xylene isomers. It was then applied as a selective membrane in an extractor type Catalytic Membrane Reactor (CMR), used to enhance the xylene isomerization reaction selectivity towards para-xylene. The results of the CMR in different configurations (permeate-only and combined permeate-&-retentate mode) were compared to conventional fixed-bed reactor results. In both cases, the selectivity was significantly enhanced (up to 100% in permeate-only mode). In the combined mode, the CMR also provided a net increase in productivity over the conventional reactor.

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Section: Discussionsupporting

confidence: 73%

“…Operation of the CMR at lower temperatures is necessary to investigate the advantages of the higher para-xylene permeance at lower temperatures. These two arguments show once again, that catalysts for CMRs need specific designs [28,30].…”

Section: Prospectsmentioning

confidence: 93%

Xylene isomerization in an extractor type catalytic membrane reactor

et al. 2005

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“…The advantages 46 brought for by this method are that shorter synthesis 47 times are needed for a continuous zeolite layer to grow 48 on the support and that preferential orientation is more 49 easily achieved. 50 On the other hand, quite recent studies [34,35] have 51 tackled the issue of membrane reactors, studying the 52 applicability of such aforementioned zeolite membranes 53 54 to continuous membrane reactors (CMRs) [34] or as 55 selectivity enhancers for reactive gas sensors [35], In 56 the latter case, the addition of a zeolite membrane im-57 proves the selectivity of semiconductor-based sensors. 58 Although finally applied to a system that could be 59 named a membrane reactor, the zeolite membrane itself 60 is only used as a molecular sieve layer, in what is known 61 as an inert membrane reactor.…”

mentioning

confidence: 99%

Preparation of silicalite-1 layers on Pt-coated carbon materials: a possible electrochemical approach towards membrane reactors

Berenguer-Murcia

Morallón

Cazorla‐Amorós

et al. 2005

Microporous and Mesoporous Materials

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10A novel kind of composites is synthesized due to the outstanding properties of carbon materials. Metallic platinum is deposited 11 on porous carbon discs by means of Potential Step Deposition (PSD) under potentiostatic conditions. Afterwards, the Pt-coated 12 discs were covered completely with colloidal zeolite (silicalite-1) crystals by means of the novel Electro Phoretic Deposition 13 (EPD) methodology. After standard hydrothermal treatment, the seed crystal coating becomes continuous, crack-free and well-14 intergrown, giving rise to a layer of silicalite-1 crystals of different sizes. It must be noted that Pt combined with the secondary 15 growth methodology has a extremely important effect on the orientation of the growing zeolite crystals. These novel materials have 16 a wide range of potential applications as membrane reactors and/or catalyst membranes after activation (i.e. template removal by 17 calcination) of the zeolite crystals. 22As a direct consequence of the many applications of 23 crystalline zeolites, such as ion exchangers, adsorbents, 24 and molecular sieves fl], and all the possibilities implied 25 therein, increasing attention has been paid to preparing 26 zeolite membranes over the years [2], 27 Considering the many different strategies that have 28 been employed nowadays [3][4][5][6][7] and the wide variety of 29 supports that have been tested already , one might 30 think that the issue of preparing a supported zeolite 31 membrane has been successfully achieved. This, how-32 ever is not so, because even from the initial approach 33 of the direct treatment of the support with a zeolite pre-34 cursor solution [8]

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“…Note that compared to other type of MRs the H 2 permeance of the DD3R membrane is relatively low (Table 1). In those studies typically the catalyst activity is the factor limiting the MR performance [9,10,13].…”

Section: Performance Evaluationmentioning

confidence: 99%

“…Therefore, many types of membranes [4] have been investigated for this type of application. For example, isobutane dehydrogenation has been studied using ␥-alumina [5], zeolite MFI [5][6][7][8][9], Pd/Ag [10][11][12], Pd [9,13], dense silica [14] and carbon molecular sieve [15] membranes. Comparison of the achieved improvements of the different MR is difficult, since the operating conditions vary considerably.…”

Section: Introductionmentioning

confidence: 99%