02914nas a2200265   4500008004100000022001400041245014500055210006900200260000800269300001200277490000700289520193600296653002302232653001402255653003102269653003002300653004002330653002902370100002502399700002202424700002502446700002102471700002402492856013202516       2024                        eng d  a1380-222400aInvestigation of structural and morphological insights of nanostructured layered double hydroxides: catalytic activity in aldol condensation0 aInvestigation of structural and morphological insights of nanost  cAPR  a759-7780 v313 a<p>
	Layered double hydroxides (LDHs) materials finds extensive applications in numerous fields such as medical science, industrial sector, agriculture and food, catalysis, polymers, nanotechnology, etc. The LDHs properties (structural, textural, morphological, spectroscopic and theoretical insights) can be design for achieving required materials for particular application in scientific areas. In the current investigation, we have synthesized mesoporous nanostructured LDHs materials via microwave, sonication and stirring method. The nanostructured LDHs was scientifically characterized by various physico-chemical techniques like XRD, N2 sorption, TGA, solid state one-dimensional 27Al magic angle spinning NMR spectroscopy, XPS, Raman Spectroscopy, FT-IR, ICP-OES, Electron Microscopy (SEM, FE-SEM, TEM and HR-TEM), EDX, elemental analysis, etc. On the basis of experimental study, it can be evidently witnessed that nanostructured LDHs materials was formed with good crystalline mesoporous nature. Solid state 27Al NMR showed single and sharp 27Al NMR signal at chemical shift value of + 1.4 ppm, strongly suggesting the presence of octahedral (Oh) AlO6 coordination site in all as-synthesized LDHs. Microwave and sonication techniques furnishes regularly dispersed well-developed flower-shaped nanocrystals however, stirring method gives mostly agglomerated nano-sized platelets. The mechanistic insights for the fabrication of nanostructures LDHs via microwave, sonication and stirring process were also highlighted. The different LDHs materials were utilized in the aldol condensation reaction of furfural with acetone for understanding structure-activity correlation. Microwave and sonication methodologies can be further exploited for the synthesis of many other inorganic-organic nanocomposites materials with stable and good dispersion of nanocrystals in addition to desired morphology and catalytic activity.</p>
10aAldol condensation10acatalysis10aFlower-shaped nanocrystals10alayered double hydroxides10aMicrowave and sonication techniques10aNanostructured materials1 aBhagat, Shailesh, K.1 aNagpure, Atul, S.1 aLanjewar, Mamata, R.1 aGode, Nilesh, G.1 aThakare, Sanjay, R.  uhttps://library.ncl.res.in/content/investigation-structural-and-morphological-insights-nanostructured-layered-double-hydroxides02641nas a2200265   4500008004100000022001400041245015200055210006900207260000800276300001100284490000800295520166500303653002301968653003001991653003102021653002802052653003402080100002502114700002202139700002502161700002102186700002502207700001602232856012702248       2025                        eng d  a1387-700300aUpgradation of biomass-derived furfural by nanostructured layered double hydroxides: Influence of stirring rate on structural features of materials0 aUpgradation of biomassderived furfural by nanostructured layered  cFEB  a1137560 v1723 a<p>
	The proficient conversion of biomass-derived compounds into the high-quality platform chemicals and bio-fuels is enormously imperative to decrease dependence on fossil feedstock. Furfural is a significant bio-based chemical which can be efficiently converted to valuable 4-(2-furyl)-3-buten-2-one (FAc) via aldol condensation. In this work, we have developed prominent layered double hydroxides (LDHs) catalysts for mild aldol condensation of furfural and acetone to acquired high performance with admirable FAc selectivity. Various nanostructured Mg-Al LDHs were synthesized through co-precipitation procedure under different stirring rate conditions. The structural, morphological and optical attributes of materials as well as recyclability aspect and structure-activity relationship was examined by characterizing the fresh and spent catalysts via numerous techniques (XRD, N2 sorption, DLS, CO2-TPD, NH3-TPD, FT-IR, UV-Visible spectroscopy, TGA, SEM, TEM, ICP-OES, 27Al NMR spectroscopy, XPS, Raman spectroscopy, etc). Several reaction parameters were also optimized. Among the catalysts tested, LDH-1200 catalyst exhibits outstanding performance by delivering 100% furfural conversion with 99% FAc selectivity. Moreover, catalyst illustrates excellent recyclability and stability. The mechanistic insight for aldol condensation was also investigated by monitoring the intermediates at different stages and intervals during the course of the reaction. This study confirms that stirring rate has significant influence on physico-chemical attributes of materials and the amount of weak basic sites plays imperative role in catalytic performance.</p>
10aAldol condensation10aBiomass-derived compounds10aFlower-shaped nanocrystals10aheterogeneous catalysis10aNanostructured mesoporous LDH1 aBhagat, Shailesh, K.1 aNagpure, Atul, S.1 aLanjewar, Mamata, R.1 aGode, Nilesh, G.1 aDeshmukh, Ganpat, D.1 aSaini, Ajay  uhttps://library.ncl.res.in/content/upgradation-biomass-derived-furfural-nanostructured-layered-double-hydroxides-influence