Exploring Zeolite Chemistry with the Tools of Surface Science: Challenges, Opportunities, and Limitations
The complexity of catalysts that the surface science community has been able to address has increased substantially in a systematic manner, starting with metal and oxide single crystal surfaces and evolving to an atomistic description of clusters and nanoparticles on well-defined, planar supports. The next step in adding complexity is now to address surfaces of porous oxide materials, in particular of zeolites, which are the most extensively used catalysts in the industry. The recently reported successful fabrication of well-ordered thin films, consisting of planar arrangement of aluminosilicate polygonal prisms on a metal substrate counting with highly acidic bridging hydroxyl groups on the surface, represents the limiting case of infinitely large pore and cages in zeolites. This model system allows one to study reactions catalyzed by zeolites using the toolkit of surface science. In this Perspective, we describe the zeolitic model system, with its virtues and limitations, as well as the challenges, opportunities and expectations for the future in modelling porous catalysts by a surface science approach.
KeywordsHeterogeneous catalysis Zeolites Brönsted acid catalysis Thin films Oxide supports MTH
We gratefully thank Prof. H.-J. Freund and all our coworkers cited in the references, in particular the theory group of Prof. J. Sauer, for their tremendous contribution to the work presented here. J.A.B thanks the A. von Humboldt Foundation and the Center for Functional Nanomaterials at BNL, under DOE contract No. DE-AC02-98CH10886.
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