Abstract
Conformal hydrotalcite coatings over hierarchically-ordered SBA-15 exhibit exceptional activity for transesterification of bulky triglycerides.
Highlights
Facile route to conformal hydrotalcite coatings over complex architectures: a hierarchically ordered nanoporous base catalyst for fatty acid methyl esters (FAMEs) production†
An alkali- and nitrate-free hydrotalcite coating has been grafted onto the surface of a hierarchically ordered macroporous–mesoporous SBA-15 template via stepwise growth of conformal alumina adlayers and their subsequent reaction with magnesium methoxide
The resulting low dimensional hydrotalcite crystallites exhibit excellent per site activity for the base catalysed transesterification of glyceryl triolein with methanol for FAME production
Summary
We extend our previous methodology to create crystalline, catalytically active hydrotalcite coatings via a versatile two-step methodology, permitting (i) the first genesis of an ultrathin alumina adlayer over a complex (hierarchically ordered) template, and (ii) facilitating its subsequent reaction with Mg(OCH3)[2] to form a stoichiometric HT/ MM-SBA-15 hydrotalcite catalyst. This novel methodology opens the way to a new class of solid bases built upon the tunable interconnectivity and porosity afforded by underlying silica architectures. A conventional hydrotalcite reference material was prepared via our alkali-free, co-precipitation method from Mg(NO3)2·6H2O and Al(NO3)3·9H2O precursors,[26] with the Mg: Al atomic ratio tuned to match that of the MM-SBA-15
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