Development on hydrophobic modification of aluminosilicate and titanosilicate zeolite molecular sieves

Wang, Baohe; Qin, Qiaoyun; Liu, Hongxia; Zhu, Jing

doi:10.1016/j.apcata.2020.117952

Cited by 32 publications

(17 citation statements)

References 132 publications

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“…The FAS layer was incorporated through the surface silanization procedure between FAS molecules and the silanol groups, forming new Si−O bonds. 21,27 Comparing the spectrum of xFAS-Pt/SBA-15 with that of Pt/SBA-15, a decrease of the intensity of the peak at 3740 cm −1 assigned to -SiO-H was observed indeed. 28 Also, three new adsorption peaks (centered at 2982, 2938, and 2903 cm −1 ) were observed in xFAS-Pt/SBA-15, corresponding to the −C−H stretching vibrations in the FAS molecule.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…The FAS pulse process was in situ monitored by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with the molecular layer deposition equipment (Figure A). The FAS layer was incorporated through the surface silanization procedure between FAS molecules and the silanol groups, forming new Si–O bonds. , Comparing the spectrum of x FAS-Pt/SBA-15 with that of Pt/SBA-15, a decrease of the intensity of the peak at 3740 cm –1 assigned to -SiO-H was observed indeed . Also, three new adsorption peaks (centered at 2982, 2938, and 2903 cm –1 ) were observed in x FAS-Pt/SBA-15, corresponding to the −C–H stretching vibrations in the FAS molecule. , With the increase of the FAS pulse number, the peak intensity of the hydroxyl gradually decreased, and the peak intensity of the −C–H bond in ethyl gradually increased.…”

Section: Resultsmentioning

confidence: 99%

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Improving the Efficiency of Hydrogen Spillover by an Organic Molecular Decoration Strategy for Enhanced Catalytic Hydrogenation Performance

et al. 2023

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Hydrogen migration from metal particles to the support, known as hydrogen spillover, has provided insights for designing highly efficient catalysts in catalytic processes involving hydrogen. A facile and controllable strategy is highly desired to achieve an effective hydrogen spillover effect on nonreducible oxides for catalytic performance optimization and clarifying the catalytic function of hydrogen spillover. Here, we provide an organic molecular decoration (OMD) strategy obtained by the molecular layer deposition-like pulse method for facilitating hydrogen spillover over the nonreducible silica support. After decorating with the fluoroalkylsilane (FAS) molecular layer, the hydrogen spillover effect over the catalysts (xFAS-Pt/SBA-15) is greatly enhanced due to the presence of carbonaceous species compared with the original Pt/SBA-15. The amount of hydrogen spillover can also be precisely regulated by controlling the FAS pulse number. For cinnamaldehyde hydrogenation, xFAS-Pt/SBA-15 presents superior catalytic performance versus its untreated counterpart and the sample decorated via the traditional method. Also, the catalytic activity varies based on the FAS pulse number, showing a linear correlation with the amount of hydrogen spillover. The altered adsorption behavior of the reactant plays an important role in the hydrogenation selectivity. This facile OMD strategy for efficient hydrogen spillover is general and may have potential applications in many heterogeneous reactions.

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Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Improving the Efficiency of Hydrogen Spillover by an Organic Molecular Decoration Strategy for Enhanced Catalytic Hydrogenation Performance

et al. 2023

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“…Zeolite catalysts are a significant class of commercial heterogeneous catalysts, with vast application in the petrochemical sector, and growth prospects in ecological catalysis and the production of fine chemicals 135‐139 . Zeolites are crystalline microporous aluminosilicates that can be modified in a variety of ways, providing a wealth of possibilities for further development of their characteristics 140‐142 . Presently, over 200 different structural kinds have been identified, each with a unique size, shape, and connection of their channels, with most of them ranging from 8 to 30 rings 129 .…”

Section: Developments and Viewpoints In Low‐alcohol Catalysismentioning

confidence: 99%

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Anekwe

Isa

Oboirien

2023

J of Chemical Tech & Biotech

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Bioethanol, synthesized through the valorization of biomass resources, is of great importance to many industries. As bioethanol has become more abundant and its price has decreased, it has become an attractive candidate for application as a base material for the synthesis of a variety of petrochemicals and fuel through catalysis. In this article, a comprehensive review of the catalytic conversion of bioethanol into hydrocarbons, including olefins and gasoline, is presented. In addition, developments and potential research opportunities in the field of bioethanol catalysis are provided to enhance bioethanol conversion. According to the findings of the study, despite significant progress in bioethanol conversion, further research is needed to address several challenges that will enable improved biofuel and chemical production.

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“…A 3A molecular sieve (3A-MS) is a material with a large number of uniform pores and orderly arranged holes in its internal structure, giving it an intensive polarity and coulomb field [18]. Therefore, it has a high adsorption capacity for polar molecules such as water.…”

Section: Introductionmentioning

confidence: 99%

Improvements in the Water Retention Characteristics and Thermophysical Parameters of Backfill Material in Ground Source Heat Pumps by a Molecular Sieve

et al. 2022

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The thermophysical properties of backfill material (BM) in a heat exchange borehole significantly influence the heat exchange effect of ground source heat pumps (GSHPs). Several treatments such as compaction and adding bentonite, cement, and fine sands are often used to improve the thermophysical properties. In this study, a 3A molecular sieve (3A-MS), a type of porous material, was added to the BM to enhance its water maintaining capacity. Three types of backfill materials with different additive contents, named as BM-0, BM-1, and BM-2, were examined. The variation of the BM properties such as the soil–water characteristic curve (SWCC), thermal conductivity, specific heat capacity, and thermal diffusivity with the groundwater content were investigated through a series of experiments and simulations. A scanning electron microscope (SEM), an energy dispersive spectrometer (EDS), and the BET method for specific surface area pore size analysis were used to characterize the material. The results indicated that the specific heat capacity improved with the water content whereas the thermal conductivity and thermal diffusivity decreased with the water content. The variation of the buried pipe outlet temperature with the change of the thermal physical parameters of the BM were researched by a numerical simulation and theoretical calculations; the results showed that BM-2 could raise the heat transfer rate per meter by 45.9% in summer and 118.4% in winter compared with the backfill materials without groundwater (NW). The research results provide theoretical support for the improvement of BM for ground source heat pump projects where abundant groundwater is available.

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Development on hydrophobic modification of aluminosilicate and titanosilicate zeolite molecular sieves

Cited by 32 publications

References 132 publications

Improving the Efficiency of Hydrogen Spillover by an Organic Molecular Decoration Strategy for Enhanced Catalytic Hydrogenation Performance

Improving the Efficiency of Hydrogen Spillover by an Organic Molecular Decoration Strategy for Enhanced Catalytic Hydrogenation Performance

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Improvements in the Water Retention Characteristics and Thermophysical Parameters of Backfill Material in Ground Source Heat Pumps by a Molecular Sieve

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