A quantitative study of the structure-activity relationship in hierarchical zeolites using liquid-phase reactions
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- Dept. of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis Minnesota 55414
- Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang Korea 37673
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena California 91125
- Dept. of Chemical Engineering, The Petroleum Institute, Khalifa University of Science and Technology, Abu Dhabi UAE
- Dept. of Chemical and Biomolecular Engineering, University of Maryland, College Park Maryland 20740
- Dept. of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis Minnesota 55414; Dept. of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore Maryland 21218; Institute for NanoBioTechnology, Johns Hopkins University, Baltimore Maryland 21218
Micro/meso/macroporous (hierarchical) zeolites show remarkable catalytic performance for reactions involving bulky reactants. However, quantitative assessment of the microstructural characteristics contributing to the observed performance remains elusive. Here, structure–activity relationships are established for a set of micro/mesoporous self-pillared pentasil (SPP) zeolites using two parallel liquid-phase reactions (benzyl alcohol alkylation and self-etherification) based on analysis of mass transport and reaction kinetics. A reaction–diffusion mathematical model is developed that quantitatively assigns the catalytic contributions of the external surface and micropores of SPP zeolites for these reactions. In addition, the effect of the zeolite external surface structure on the corresponding catalytic activity is quantitatively assessed by comparing SPP zeolites (with MFI structure) with MCM-22 (with MWW structure). This work demonstrates that reaction–diffusion modeling allows quantitative description of the catalytic performance of hierarchical zeolites and provides a model reaction to assess nm-sized characteristic diffusion lengths in MFI.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI); Univ. of Delaware, Newark, DE (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC0001004
- OSTI ID:
- 1566399
- Journal Information:
- AIChE Journal, Vol. 65, Issue 3; ISSN 0001-1541
- Publisher:
- American Institute of Chemical Engineers
- Country of Publication:
- United States
- Language:
- English
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