Image courtesy of Dawn Adin and John Buchner
Sheets of zeolite catalysts form an open pore structure like a “house-of-cards”.
Repetitive branching, a novel and simple synthesis method, produces crystals of zeolite, an important industrial chemical, with large-pore “highways” that improve transport and utilization of chemicals within the crystal.
Zeolite catalysts have many applications in petrochemicals, pharmaceuticals, biomass, and water purification. This synthesis method improves the effectiveness of traditional zeolites with no increase in cost or unwanted change in functionality.
Increasing demand for energy and materials has led to an accelerated research effort in the development of renewable chemicals for a sustainable economy. Efforts within the Catalysis Center for Energy Innovation (CCEI), a DOE-funded Energy Frontier Research Center (EFRC), are aimed at realizing novel catalytic processes for production of chemicals and fuels from biomass-derived feedstocks by bridging catalyst design, reaction engineering and fundamental understanding of reaction mechanism. The researchers used a novel and simple synthesis technique, called repetitive branching, to stack the thin zeolite sheets at right angles generating a "house-of-cards" shaped crystal. By creating zeolite crystals with large-pore "highways," which are about 10 times bigger than the zeolite pores, chemicals and molecules can pass rapidly through the channels to reach the smaller, reactive pores within the crystal. This results in faster, more selective, and more stable catalysts, produced at the same cost as traditional zeolite catalysts. Research was performed at the University of Minnesota and has been licensed to Argilex.
University of Minnesota
Director of the Catalysis Center for Energy Innovation EFRC
DOE Office of Science Basic Energy Sciences program, Energy Frontier Research Centers (EFRC) program (all aspects of self-pillared pentasil zeolite); Abu Dhabi-Minnesota Institute for Research Excellence (partial support for synthesis and catalytic testing of comparison zeolites); National Science Foundation (partial support for synthesis and catalytic testing of comparison zeolites); University of Minnesota Institute on the Environment—Initiative for Renewable Energy and the Environment (partial support for synthesis and catalytic testing of comparison zeolites); University of Minnesota Characterization Facility partially supported by NSF; Minnesota Supercomputing Institute (computing resources); University of Minnesota Graduate School doctoral dissertation fellowship (X.Z.); ADGAS and GASCO (Y.A.W.).
Zhang, X. Y. et al. “Synthesis of Self-Pillared Zeolite Nanosheets by Repetitive Branching” Science 336 1684-1687 (2012). [DOI: 10.1126/science.1221111]
Varoon, K, et al. "Dispersible exfoliated zeolite nanosheets and their application as a selective membrane." Science 334 72-75 (2011). [DOI: 10.1126/science.1208891]
Office of Science Stories of Discovery & Innovation
Catalysis Center for Energy Innovation EFRC
Technology Impact, Collaborations, Non-DOE Interagency Collaboration, International Collaboration