Quantitative principle of shape-selective catalysis for a rational
screening of zeolites for methanol-to-hydrocarbons
Abstract
The production of hydrocarbons for the synthesis of readily available
energy and multifunctional materials is of great importance in modern
society. Zeolites have proven to be a boon for the targeted regulation
of specific hydrocarbon as shape-selective catalyst in converting carbon
resources. Yet our mechanistic understanding and quantitative
description of shape-selectivity of zeolite catalysis remains rather
limited, which restricts the upgrade of zeolite catalysts. Herein, we
proposed quantitative principle of shape-selectivity for zeolite
catalysis using methanol-to-hydrocarbons (MTH) as model. Combining with
molecular simulations and infrared imaging, we unveil the competition of
thermodynamic stability, preferential diffusion and favored secondary
reactions between different hydrocarbons within zeolite framework are
the essence of zeolite shape-selective catalysis. Notably, we provide
methodology to in silico search for the optimal combination of framework
topology and acidity properties of zeolites with operating conditions
that potentially outperform commercial MTH catalysts to achieve high
selectivity of desired hydrocarbon products.