![]() Therefore, semi-finished intermediates repeatedly transfer between the two types of catalytic sites until the ultimate formation of ethanol with high efficiency (ethanol yield, 4.53 mmol h −1 g cat. ![]() The Zr 6 cluster is in charge of molecular dissociation, while the TCPP-Cu unit is responsible for molecular assembly. Two types of catalytic sites in PCN-224-Cu, i.e., the Zr 6 cluster and TCPP-Cu unit, act like organelles, which can complete a class of reactions instead of particular one. Herein, with a series of control experiments and stepwise theoretical derivation based on the calculations of density functional theory and a semi-empirical method, a generalized cascade catalysis is discovered for the chemocatalytic conversion of CO 2 to higher alcohols over a porphyrinic zirconium metal–organic framework, PCN-224-Cu. Basic barriers simply 'push back' against the projectile, slowing it to a harmless speed or (if strong enough) stopping it entirely. A kinetic barrier uses mass effect technology to create a force field that repels or deflects objects that enter the field at dangerous speeds. However, except for biocatalysis with enzymes, most chemocatalytic cascades in essence combine several reactions that occur over mutually independent catalytic sites in a container. A kinetic barrier is a type of defensive shield used in Mass Effect. ![]() ![]() Reproducing the highly efficient catalytic cascade system to mimic life behaviors in vitro has been intensively investigated over the past few decades. ![]()
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