Glycerol dehydration catalyzed by MWW zeolites and the changes in the catalyst deactivation caused by porosity modification

Rodrigues, Mariana Veiga; Vignatti, Charito Ivana; Garetto, Teresita Francisca; Pulcinelli, Sandra Helena; Santilli, Celso Valentim; Martins, Leandro

doi:10.1016/j.apcata.2015.02.010

Cited by 56 publications

(60 citation statements)

References 33 publications

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“…Recently, two similar studies employing MWW-type catalysts in this reaction have been reported. 406,407 In both cases, MCM-22, pillared MCM-36 and delaminated ITQ-2 zeolites were compared under gas phase conditions. ITQ-2 stood out as the best catalyst in terms of conversion, selectivity (Fig.…”

Section: Hierarchical Zeolites In Catalytic Pyrolysismentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

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Section: Hierarchical Zeolites In Catalytic Pyrolysismentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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“…Rodrigues et al 299 and Kikhtyanin et al 300 studied the formation of coke in the comparative studies of MCM-22, pillared MCM-36 and delaminated ITQ-2. In both studies it was found that the hierarchization of the structure prevented excessive coke formation and the catalyst life-time was substantially increased.…”

Section: Layered Zeolitesmentioning

confidence: 99%

Layer like porous materials with hierarchical structure

et al. 2016

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Many chemical compositions produce layered solids consisting of extended sheets with thickness not greater than a few nanometers. The layers are weakly bonded together in a crystal and can be modified into various nanoarchitectures including porous hierarchical structures. Several classes of 2-dimensional (2D) materials have been extensively studied and developed because of their potential usefulness as catalysts and sorbents. They are discussed in this review with focus on clays, layered transition metal oxides, silicates, layered double hydroxides, metal(iv) phosphates and phosphonates, especially zirconium, and zeolites. Pillaring and delamination are the primary methods for structural modification and pore tailoring. The reported approaches are described and compared for the different classes of materials. The methods of characterization include identification by X-ray diffraction and microscopy, pore size analysis and activity assessment by IR spectroscopy and catalytic testing. The discovery of layered zeolites was a fundamental breakthrough that created unprecedented opportunities because of (i) inherent strong acid sites that make them very active catalytically, (ii) porosity through the layers and (iii) bridging of 2D and 3D structures. Approximately 16 different types of layered zeolite structures and modifications have been identified as distinct forms. It is also expected that many among the over 200 recognized zeolite frameworks can produce layered precursors. Additional advances enabled by 2D zeolites include synthesis of layered materials by design, hierarchical structures obtained by direct synthesis and top-down preparation of layered materials from 3D frameworks.

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“…This behaviour, higher carbon formation with smaller pores, has been reported in literature [33]. In this paper, this insight is used to thermally modify catalysts and thereby improving their lifetime and yield of acrolein.…”

Section: Introductionmentioning

confidence: 79%

“…In a previous paper by the authors [4] as well as a few available reviews [5][6][7] gives a good overview of the subject; the classes of catalysts used include: heteropoly acids and other supported inorganic acids [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], zeolites [21,[27][28][29][30][31][32][33], mixed oxides [34][35][36][37][38][39][40][41], and sulphated zirconia [42,43], all of which are solid acid materials. The acids usually contain or are promoted with P, W, S, Mo, and B, Abstract Pore condensation has been suggested as an initiator of deactivation in the dehydration of glycerol to acrolein.…”

Section: Introductionmentioning

confidence: 99%