10.1002/anie.202104859
Angewandte Chemie International Edition
COMMUNICATION
In conclusion, we have developed a strategy combining surface
modification, diffusion measurements, and catalytic tests, in order
to quantify the effect of external surface diffusion barriers on
zeolite catalysis. In this work, SiO2 deposition by chemical liquid
deposition was used to modify the surface of zeolite Beta and,
subsequently, to regulate surface barriers; then, the apparent
diffusivity of the reactant (i.e., n-pentane) was measured using the
ZLC method to reveal how SiO2 deposition affects surface
barriers; lastly, the catalytic performance for isomerization of n-
pentane was tested in a fixed-bed reactor to quantify the influence
of surface barriers on zeolite catalysis. The results show that SiO2
deposition can only lead to a very slight change in textural
properties, but an obvious reduction in BAS number. After the
surface modification, surface barriers are significantly reduced,
leading to a 121–148% increase in the apparent diffusivity of n-
pentane and a 51–131% improvement in the apparent catalytic
activity. This work provides a new strategy to investigate and
control the role of surface barriers in zeolite catalysis, and the
results suggest that surface barriers should be accounted for
when developing zeolite catalysts used in industry.
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Keywords: Zeolite Beta • surface modification • surface barriers
G. Ye, Z. Guo, Y. Sun, K. Zhu, H. Liu, X. Zhou, M. O. Coppens,
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