Cooperative bimetallic catalyst for thio-etherification reaction prepared by crystal-facet engineering of γ-Al2O3 support

Wang, Lei; Liu, Haiyan; Fan, Yu; Yuan, Pei; Huang, Deqi; Oyama, S. Ted; Wang, Tinghai; Bao, Xiaojun

doi:10.1016/j.cattod.2020.06.062

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…The periodic planes correspond to the d-spacing of 0.280, 0.290 and 0.241 nm with (022), ( 220) and (111) lines, respectively. These planes are indicative of a regular arrangement of γ-Al 2 O 3 , spinel Co 3 O 4 and cubic NiO, in agreement with the findings [41,43]. The nanoparticles have somewhat small sizes ranging from 1 to 5 nm, being finely dispersed throughout the bulk (top right, Figure 6(A 3 )) some of them included in the large pores of the sample, as shown by the selected area (inset top right, Figure 6(A 3 )).…”

Section: Textural and Morphological Propertiessupporting

confidence: 90%

“…The HRTEM image suggests lattice spacings of ca. 0.280 and 0.456 nm, which are indexed to be in the (022) and (111) planes of γ-Al 2 O 3 , as found elsewhere [40,41]. Additionally, inset Figure 5(A 3 ) illustrated a dark particle too large to be discerned, suggesting segregation of La 2 O 3 , in agreement with EDS results (Figure S1 in Supplementary Materials).…”

Section: Textural and Morphological Propertiessupporting

confidence: 86%

“…With the addition of the basic promoters to the alumina, the sol-gel prepared binary support oxides decrease their amounts of surface acid sites, prevailing very few weak to medium acid sites. Based on the reports, MgO, ZnO and La 2 O 3 are assumed to be basic oxides and therefore, the absence of acid sites is not expected [41][42][43][44]46]. In contrast, alumina itself has both acid and base sites characteristic of an amphoteric oxide [42,44].…”

Section: Acidity Of the Catalystsmentioning

confidence: 99%

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Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

et al. 2022

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A facile strategy for the design of porous supports was obtained by modifying the sol-gel method followed by the wet impregnation technique. In this respect, herein, the acidity of the γ-Al2O3 phase was modulated by adding basic MgO, La2O3 or ZnO promoters to form binary supported catalysts. The Ni and Co dispersion on the supports associated with their tunable acidity and morphologies resulted in highly porous supported alumina-based catalysts. The physicochemical properties of the solids were comprehensively investigated by XRD, textural properties, Raman and FTIR spectroscopy, SEM-EDS, TEM, EPR and XPS analyses. The catalytic performances in the esterification of glycerol in the presence of acetic acid (EG) for the acetins production were evaluated. The highly dispersed NiO and Co3O4 active species on binary porous supports produced synergistic effects appearing to be the reason for the activity of the solids in the EG reaction. Under the optimized reaction conditions, NiCo/MgO-Al2O3 was found to be a robust solid with superior catalytic performance and improved stability in four reaction cycles with 65.0% of glycerol conversion with an exclusive selectivity of 53% for triacetin. The presence of Co2+/Co3+ and Ni2+ strongly interacting with the spinel γ-Al2O3 and MgAl2O4 phases, the latter having a large number of lattice oxygen species, was considered another active component besides those of Ni and Co in the esterification of glycerol.

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Section: Textural and Morphological Propertiessupporting

confidence: 90%

Section: Textural and Morphological Propertiessupporting

confidence: 86%

Section: Acidity Of the Catalystsmentioning

confidence: 99%

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Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

et al. 2022

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“…1 b-d, showing a uniform Al 2 O 3 shell with an average thickness of ~ 25.5 nm over the FSA core. The lattice spacings of 0.28 and 0.45 nm were observed in HREM analysis corresponds to (022) and (111) planes of Al 2 O 3 shell, respectively [ 34 ]. Similarly, ZnO shell deposition on FSA core results in a smooth surface with an average thickness of ~ 17.6 nm, showing a lattice spacing of 0.25 nm, assigned to the (101) plane of the ZnO as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Atomic-Scale Layer-by-Layer Deposition of FeSiAl@ZnO@Al2O3 Hybrid with Threshold Anti-Corrosion and Ultra-High Microwave Absorption Properties in Low-Frequency Bands

et al. 2021

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Developing highly efficient magnetic microwave absorbers (MAs) is crucial, and yet challenging for anti-corrosion properties in extremely humid and salt-induced foggy environments. Herein, a dual-oxide shell of ZnO/Al2O3 as a robust barrier to FeSiAl core is introduced to mitigate corrosion resistance. The FeSiAl@ZnO@Al2O3 layer by layer hybrid structure is realized with atomic-scale precision through the atomic layer deposition technique. Owing to the unique hybrid structure, the FeSiAl@ZnO@Al2O3 exhibits record-high microwave absorbing performance in low-frequency bands covering L and S bands with a minimum reflection loss (RLmin) of -50.6 dB at 3.4 GHz. Compared with pure FeSiAl (RLmin of -13.5 dB, a bandwidth of 0.5 GHz), the RLmin value and effective bandwidth of this designed novel absorber increased up to ~ 3.7 and ~ 3 times, respectively. Furthermore, the inert ceramic dual-shells have improved 9.0 times the anti-corrosion property of FeSiAl core by multistage barriers towards corrosive medium and obstruction of the electric circuit. This is attributed to the large charge transfer resistance, increased impedance modulus |Z|0.01 Hz, and frequency time constant of FeSiAl@ZnO@Al2O3. The research demonstrates a promising platform toward the design of next-generation MAs with improved anti-corrosion properties.

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“…Hence, the γ-Al 2 O 3 films with (100), (110), and (111) plane [23,24] and well-defined surfaces of α-Al 2 O 3 [25] with different facets were synthesized. It was found that the facets of Al 2 O 3 crystal not only determined the morphology, sulfidation rate, orientation, and reactivity of MoS 2 nanoparticles, but also affected the surface acid/base properties [26]. Compared with α polymorphs, γ-Al 2 O 3 is less straightforward and possess different surface OH speciation and surface properties [20].…”

Section: Introductionmentioning

confidence: 99%

Management of γ-Alumina with High-Efficient {111} External Surfaces for HDS Reactions

Liang

Sun

et al. 2020

Catalysts

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A series of γ-alumina samples with different exposure ratio of {111} facet were synthesized by an efficient hydrothermal method via adjusting the pH value of the gel precursor. The nanorod alumina supported catalyst with the highest exposure of {111} facet exhibited the best hydrodesulfurization (HDS) activities of both thiophene and dibenzothiophene (DBT). Characterization of the sulfided NiMo/Al2O3 catalyst with preferential exposure of {111} facet showed that the MoS2 nano slabs were inclined to distribute in the direction along the edges of alumina nanocrystal in reduced stacking layers. The selective exposure of {111} facet played a decisive role in obtaining alumina-supported HDS catalysts with improved intrinsic activity. This work helps to better understand the relationship between catalytic properties and varied support surfaces, which demonstrate a proper design of the catalyst support morphology on the facet-level.

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Cooperative bimetallic catalyst for thio-etherification reaction prepared by crystal-facet engineering of γ-Al2O3 support

Cited by 7 publications

References 46 publications

Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

Atomic-Scale Layer-by-Layer Deposition of FeSiAl@ZnO@Al2O3 Hybrid with Threshold Anti-Corrosion and Ultra-High Microwave Absorption Properties in Low-Frequency Bands

Management of γ-Alumina with High-Efficient {111} External Surfaces for HDS Reactions

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