日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

This paper examines the ability to use new organo-cations in the search For new high silica zeolite structures. A strong correlation can be found for the space-filling demands of the organic guest with the available space in the host lattice.For this reason it is sensible to construct rigid guest molecules. However,spatial factors are not enough We therefore also examine the role of lattice-substituting elements in the outcome of the synthesis experiments Experimental work on probing thermodynamic and kinetic issues for the directing function of the guest molecule in the synthesis is also presented. One emerging feature is the importance of van der Waals interactions from guest to developing host at the nucleation stage. Zeolite catalysts have an increasing role in the successful manufacture of a variety of chemical-and petroleum-based products Manufacturing countries throughout the world are watchful foropportunities involving enhanced selectivity,reactivity or lifetime for these inorganic,crystalline oxides used as catalysts. The discovery of new structures,which are then tested as catalysts, is an event which,researchers in the field look forward to The discussion given in this paper attempts to outline some of the approaches taken at Chevron Reserch and Technology Company to tailor organic guest molecules which, in concert with other variables, can influence the host lattice which eventually crystallizes.