Fast, low-pressure, low-temperature microwave synthesis of ABW cesium aluminosilicate zeolite nanocatalyst in organotemplate-free hydrogel system
作者： Tamara Mahmoud Ali Ghrear , Ying-Wai Cheong , Gin Keat Lim , Daniel Chateigner , Tau Chuan Ling
DOI: 10.1016/J.MATERRESBULL.2019.110691
关键词:
摘要: Abstract Cs-ABW zeolite nanocrystals were synthesized using a microwave-assisted hydrothermal technique without an organic template. Using powder X-ray diffraction Rietveld refinement and spectroscopy, we found that pure ABW-type CsAlSiO4 (Si/Al ratio = 1.08) with orthorhombic structure (space group Pc21n, a = 9.4425(21) A; b = 5.4437(11) c = 8.9152(19) A) can be crystallized from clear precursor solution of 4SiO2:1Al2O3:16Cs2O:160H2O (180 °C, 6 min). The nanoparticles had mean particle size 68 nm thermally colloidally stable. nanocrystals—which high accessible basic sites, (Si–O–Al)−Cs+, located at their external surface—were active in catalyzing the cyanoethylation aliphatic alcohols under non-microwave instant heating, 100 % selectivity to desired product catalyst reusability. Furthermore, methanol catalyzed by nanocrystalline heating equal or better reactivity than those other solid base catalysts.
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