Novel catalyst PTMA-PILC: structural properties and catalytic performance for the dehydration of bioethanol to ethylene

Xie, Xianmei; Li, Zheng; Li, Baoru; Wu, Xu; An, Xia

doi:10.1039/c5ra02055g

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…from 21 to 335 m 2 /g) and formation of large mesopores, generated by smaller packets of layers arranged disorderly. 233 Pillaring with metal cation oligomers followed by calcination introduces metal oxide species between the layers, thus generating the interlayer pores (supermicropores and narrow mesopores) as described above. Porosity of such systems depends on many parameters, including type of the clay (especially charge density of the layers), type and content of the metal as well as chemistry of oligomeric cations used for pillaring (see Figure 13).…”

Section: Claysmentioning

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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Section: Claysmentioning

confidence: 99%

Layer like porous materials with hierarchical structure

et al. 2016

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“…9. It was found that all catalysts exhibited the similar trend of the TGA patterns 31 . The results are shown in Fig.…”

Section: Catalytic Dehydration Of Ethanolmentioning

confidence: 78%

Catalytic Ethanol Dehydration over Different Acid-activated Montmorillonite Clays

Krutpijit

Jongsomjit

2016

J. Oleo Sci.

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“…Therefore, the key point for industrial ethanol dehydration to ethylene is to obtain higher selectivity and reaction stability through catalyst development [11,12]. Extensive studies have been carried out to develop heterogeneous catalysts for the dehydration of ethanol, including alumina [13][14][15][16], zeolites [17][18][19], metal oxides [20,21], and heteropoly acids [22,23]. Outstanding catalysts such as zeolite and heteropoly acid present high selectivity and lower reaction temperature when applied to ethanol dehydration at the laboratory scale, yet problems such as the short catalyst life and the narrow range of reaction temperatures need to be solved.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Dehydration to Ethylene over High-Energy Facets Exposed Gamma Alumina

Wang

Peng

et al. 2023

Catalysts

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Highly efficient and stable catalysts are among the key factors in industrial ethanol dehydration to ethylene. Among the widely studied catalysts, alumina is the most suitable for industrial application. In this study, novel gamma alumina was synthesized by solvent protection and a hydrothermal procedure. HRTEM, XRD, FT-IR, NH3-TPD, H-D exchange, and 29Si MAS NMR were employed to compare the difference in physicochemical properties between the novel gamma alumina and commercial alumina. Characterization results show that the as-synthesized novel gamma alumina mainly exposes the high-energy crystal plane (111) while the commercial alumina mainly exposes the thermostatically stable (110) crystal plane. The dominating (111) plane, according to the characterizations, endows the novel gamma alumina with a higher density of surface hydroxyl groups, higher acid content, and higher surface energy compared to the commercial alumina. The catalytic performance of the two catalysts for industrial ethanol dehydration to ethylene was studied. The novel (111) plane-exposed alumina showed a higher yield of ethylene than commercial alumina under the same reaction conditions. This could be related to the difference in atomic arrangement and the unsaturated aluminum coordination of different crystal planes. Stability testing under severe reaction conditions (450 °C, 1 MPa, 4 h−1) indicates that novel gamma alumina shows better stability (catalyst life cycle increased by 50%) and produces less acetaldehyde as a byproduct. The effects of steam treatment on the catalytic performance were further investigated. The surface acidity and the catalytic performance of novel gamma alumina present a volcanic curve with the increase in steam treatment temperature. Under the optimal water vapor treatment temperature of 650 °C, the conversion of ethanol and selectivity of ethylene were both higher than 99%.

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Novel catalyst PTMA-PILC: structural properties and catalytic performance for the dehydration of bioethanol to ethylene

Abstract: Novel phosphomolybdic acid-pillared interlayer clay (PTMA-PILC) catalysts were prepared by three steps: acid treatment, ion-exchange and impregnation method.

Cited by 8 publications

References 46 publications

Layer like porous materials with hierarchical structure

Layer like porous materials with hierarchical structure

Catalytic Ethanol Dehydration over Different Acid-activated Montmorillonite Clays

Ethanol Dehydration to Ethylene over High-Energy Facets Exposed Gamma Alumina

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