Ultrasound-assisted sequentially precipitated nickel-silica catalysts and its application in the partial hydrogenation of edible oil

Lim, Mitchell S.W.; Yang, Thomas C.-K.; Tiong, Timm Joyce; Pan, Guan‐Ting; Chong, Siewhui; Yap, Yeow Hong

doi:10.1016/j.ultsonch.2021.105490

Cited by 7 publications

(1 citation statement)

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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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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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Silica extraction from rice hull ash through the sol–gel process under ultrasound

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Irigon

et al. 2022

Environ Sci Pollut Res

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Rice is among the main foods produced in the world and is part of the daily diet of most families. The main waste from rice processing is rice husk (RH), which has been used as biomass for energy generation through combustion. In this process, rice husk ash (RHA) is generated as a residue, and its silica (SiO 2 ) content varies from 85-98%. The present work describes the study of the extraction of silica from RHA by the ultrasoundassisted sol-gel method. An experimental design based on the Response Surface Methodology (RSM) with the symmetrical, second-order Rotational Central Composite Design (RCCD) was applied to determine the best extraction conditions considering extraction time and molar ratio (n) as variables = n NaOH / n Silica ). These optimal conditions were then applied to three ash samples, two obtained by the combustion process in a boiler furnace, with a mobile grate system (RHAC 1 and RHAC 2 ), and one obtained by the pyrolysis process (RHAP) carried out in a xed bed reactor. Results showed that a molar ratio of 4.4, and an extraction time of 107 minutes were the best extraction conditions, leading to a yield of 73.3% for RHAP, 43.9% for RHAC 1 , and 31.1% for RHAC 2 . It was found that the extraction yield and textural properties of the silica obtained depend on the characteristics of the ash used. The silica extracted from RHAC 1 presented a surface area of 465 m 2 .g − 1 , mesopores of 4.69 nm, purity greater than 95%, and an ultra-ne granulometric distribution, reaching nanoparticle dimensions, characteristics comparable to commercially available silicas.

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