Synthesis and characterization of mesoporous composite silica monolith

Guli, Mina; Yao, Jie; Chen, Lei; Xiao, Li; Rao, Wangping; Zhao, Jianguo

doi:10.1016/j.apt.2014.03.004

Cited by 4 publications

(1 citation statement)

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“…The textural properties of SBA‐15 can be altered in a wide range and various morphologies, such as rod, fiber, sphere, film, monolith, etc., which are obtained by adjusting the synthetic conditions. Zhou et al ., successfully synthesized 3D‐ SBA‐15 with net‐linked microscopic structure by controlling the shearing force and the acidity of the system . Yang et al reported that compared with unsupported Co 3 O 4 –CeO 2 particles, the CoCe/ 3D‐ SBA‐15 catalysts with optimized Co 3 O 4 –CeO 2 loading showed much higher catalytic ability, which was attributed to the high dispersion of Co 3 O 4 –CeO 2 on 3D‐ SBA‐15 and the cross‐linked macroporous structure of 3D‐ SBA‐15 that could house the soot particulates, thus providing closer contact between the soot and catalytically active sites .…”

Section: Introductionmentioning

confidence: 99%

Sodium Tungstate Supported on a Three‐dimensional and Networked SBA‐15 for Knoevenagel Reaction

2019

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Sodium tungstate (ST) supported on a three-dimensional and networked SBA-15 (3D-SBA-15) was utilized as a novel efficient catalyst for the Knoevenagel condensation of aldehydes with active methylene compounds such as malononitrile and ethyl cyanoacetate to afford substituted olefins through the conventional magnetic stirring or under ultrasound irradiation. ST/3D-SBA-15 catalyst was prepared using an incipient wetness impregnation method and confirmed by series of characterizations such as Fourier-transform infrared spectra (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD), N 2 adsorption-desorption and inductively coupled plasma-optical emission spectroscopy. The reaction proceeded smoothly under the both stirring and ultrasound-assisted conditions at room temperature. The 30ST/3D-SBA-15 catalyst with 30 wt% loading of Na 2 WO 4 showed the highest catalytic performance with excellent yield within short time, and improvements were observed by carrying out the reactions under ultrasound irradiation. In addition, the solvent effect was significant in this work, and the optimum solvent was ethanol and water with volume ratio of 1 : 1.

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Section: Introductionmentioning

confidence: 99%