Identification of Vicinal Silanols and Promotion of Their Formation on MCM-41 via Ultrasonic Assisted One-Step Room-Temperature Synthesis for Beckmann Rearrangement

Wang, Zichun; Jiang, Yijiao; Zhang, Yunyao; Jun, Shi; Stampfl, Catherine; Hunger, Michael; Huang, Jun

doi:10.1021/acs.iecr.8b00274

Cited by 20 publications

(3 citation statements)

References 57 publications

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“…[ 31 ] For (AEV)[Pb 2 Br 8 ], the radicals could be stable at room temperature due to most likely shielding effect of the 1D lead chain. [ 32,33 ]…”

Section: Resultsmentioning

confidence: 99%

Radical Hybrids with Multiple Responses to Thermal Stimuli via Electron Transfer

Sang

Zeng

et al. 2022

Adv Funct Materials

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It is desirable to develop semiconductors with simultaneously multiple responses to single stimuli. Herein, a thermally responsive hybrid semiconductor (AEV)[Pb 2 Br 8 ] (AEV 4+ = 1,1′-bis(2-ammonioethyl)-[4,4′-bipyridine]-1,1′diium) is successfully prepared by introducing functionalized organic cations into 1D lead(II) chains. The lead(II) chain contains an edge-sharing PbBr 6 octahedron with highly electron-deficient cations distributed in the interspace of the inorganic framework. Interestingly, the as-formed hybrid exhibits extraordinary thermochromic behavior along with intriguing temperaturedependent conductivity and thermal conductivity due to the thermal motion of the electrons in the hybrid. Specifically, the color of the pristine hybrid changes from yellow to brown when the temperature rises to 70 °C, and gradually deepens as the temperature continues to rise, accompanied by the continuous decline in electric conductivity and thermal conductivity. Once heating is stopped, the color and conductivity recover to the original state in a few minutes. As demonstrated by electron paramagnetic resonance and X-ray photoelectron spectroscopy studies, the thermal-induced electron transfer is likely responsible for the intriguing thermally responsive behaviors. This work provides a paradigm for the modular and functional design of hybrid materials that manifest potential applications in semiconductor refrigeration, thermal power generation, intelligent circuit, and other opt-electronic devices.

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“…[ 31 ] For (AEV)[Pb 2 Br 8 ], the radicals could be stable at room temperature due to most likely shielding effect of the 1D lead chain. [ 32,33 ]…”

Section: Resultsmentioning

confidence: 99%

Radical Hybrids with Multiple Responses to Thermal Stimuli via Electron Transfer

Sang

Zeng

et al. 2022

Adv Funct Materials

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“…This may be the reason for the enhanced porosity of some sonochemically synthesized products. SSA values and potential applications of porous silicas and organosilicas obtained via sonochemical-assisted methods are summarized in Table 1 [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ].…”

Section: Sonochemical Synthesis Properties and Applications Of Nanopo...mentioning

confidence: 99%

Recent Developments in Sonochemical Synthesis of Nanoporous Materials

et al. 2023

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Ultrasounds are commonly used in medical imaging, solution homogenization, navigation, and ranging, but they are also a great energy source for chemical reactions. Sonochemistry uses ultrasounds and thus realizes one of the basic concepts of green chemistry, i.e., energy savings. Moreover, reduced reaction time, mostly using water as a solvent, and better product yields are among the many factors that make ultrasound-induced reactions greener than those performed under conventional conditions. Sonochemistry has been successfully implemented for the preparation of various materials; this review covers sonochemically synthesized nanoporous materials. For instance, sonochemical-assisted methods afforded ordered mesoporous silicas, spherical mesoporous silicas, periodic mesoporous organosilicas, various metal oxides, biomass-derived activated carbons, carbon nanotubes, diverse metal-organic frameworks, and covalent organic frameworks. Among these materials, highly porous samples have also been prepared, such as garlic peel-derived activated carbon with an apparent specific surface area of 3887 m2/g and MOF-177 with an SSA of 4898 m2/g. Additionally, many of them have been examined for practical usage in gas adsorption, water treatment, catalysis, and energy storage-related applications, yielding satisfactory results.

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“…The peaks at 3.9 and 1.4 ppm remarkably decrease when the sample was dehydrated at 350 °C. An additional peak observed at 2.1 ppm is assigned to SiOH groups. , These 1 H MAS NMR spectra were simulated, and the corresponding results are summarized in Table S2. The concentration of the peak at 3.9 ppm strongly decreases from 24.5% at RT to 0% at 350 °C.…”

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confidence: 99%

Formation and Location of Pt Single Sites Induced by Pentacoordinated Al Species on Amorphous Silica–Alumina

Zhao

Wang

Kochubei

et al. 2021

J. Phys. Chem. Lett.

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Alumina and its mixed oxides are popular industrial supports for emerging supported metal catalysts. Pentacoordinated Al (Al V ) species are identified as key surface sites for anchoring and stabilizing metal single-site catalysts; however, Al V is rare in conventional amorphous silica−alumina (ASA). Recently, we have developed Al V -enriched ASA, which was applied as a support for the synthesis of Pt single-site catalysts in this work. Each preparation stage and the interaction between Pt and surface Al species were explored by 1 H and 27 Al solid-state nuclear magnetic resonance spectroscopy, and the formation of the dominant Pt single sites on the surface of Al V -enriched ASA was confirmed by high-angle annular dark-field imaging scanning transmission electron microscopy and energy dispersive spectroscopy line scanning. On the surface of supports without a significant Al V population (Pt/Al 2 O 3 and Pt/SiO 2 ), mainly Pt nanoparticles were formed. This indicates that Al V contributes to the strong metal−support interaction to stabilize the Pt single sites on Pt/ASA, which was characterized by diffuse reflectance infrared Fourier transform spectroscopy combined with CO adsorption, X-ray photoelectron spectroscopy, and electron energy loss spectroscopy. Pt single sites supported on Al V -enriched ASA exhibit excellent chemoselectivity in the hydrogenation of CO groups, affording 2−3-fold higher yields compared to those of Pt nanoparticles supported on Al 2 O 3 and SiO 2 .

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Identification of Vicinal Silanols and Promotion of Their Formation on MCM-41 via Ultrasonic Assisted One-Step Room-Temperature Synthesis for Beckmann Rearrangement

Cited by 20 publications

References 57 publications

Radical Hybrids with Multiple Responses to Thermal Stimuli via Electron Transfer

Radical Hybrids with Multiple Responses to Thermal Stimuli via Electron Transfer

Recent Developments in Sonochemical Synthesis of Nanoporous Materials

Formation and Location of Pt Single Sites Induced by Pentacoordinated Al Species on Amorphous Silica–Alumina

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