The C–Si–Zr material synthesized from bio-derived waste glycerol, ZrO(NO3)2 and TEOS exhibits excellent catalytic activity for tri-acetin production from low-value glycerol.
Correction for ‘One-pot synthesis of ordered nanoporous amorphous H-Zn-aluminosilicate for catalysis of bulky molecules’ by Jitendra Diwakar et al., Sustainable Energy Fuels, 2018, 2, 1693–1698, https://doi.org/10.1039/C8SE00150B.
A versatile, bi-functional, acido-basic
catalyst efficient
for
two industrially important acetalization and aldol condensation reactions
is developed through the grafting of lanthanum into the beta zeolite
lattice. The grafting is achieved through the controlled dealumination
of a zeolite framework by oxalic acid treatment followed by lanthanum
impregnation, leading to the substitution of aluminum in the zeolite
framework by lanthanum. The first-of-its-kind catalyst composition
with rare-earth metal grafted into a zeolite framework confers highly
desirable catalyst properties like high lanthanum dispersion, stability,
and the close proximity of acid and base sites. The structure–property
relationship, nature, and location of the catalytically active center
and conceivable cooperative synergism are realized through the various
characterization techniques like X-ray diffraction, Fourier transform
infrared spectroscopy, 27Al NMR, 29Si NMR, NH3 temperature-programed desorption (TPD), CO2-TPD,
UV–vis spectroscopy, and Raman spectroscopy. The studies allowed
us to propose the acid–base pair in the Si–O–La–O–Si
group along with the adjacent Bronsted acid site is the active center
for the reactions.
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