Great current progress in the materials science offers an enormous choice of novel adsorbents which may be promising for transformation and storage of low temperature heat, e.g. from renewable heat sources. This paper gives an overview of recent trends and achievements in this field. We consider possible optimization of zeolites by dealumination, further development on aluminophosphates, composites salt in porous host matrice and metal-organic frameworks which are currently receiving the largest share of scientific attention. The particular attention is focused on the chemical nano-tailoring and tunable adsorption behavior of these materials to satisfy the demands of appropriate heat transformation cycles. We hope that this review will give new impact on target-oriented research on the novel adsorbents for heat transformation and storage

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8473support of the Basic Research Fund administered by the Israeli Academy of Sciences, the contribution of David Yogev to the design of the system and preliminary measurements, and the help of Ofra Levi in some of the calculations. R e t r y NO. Ag, 7440-22-4. References and Notes(1) Yogev, D.; Efrima, S.A series of dealuminated mordenites (with Si/Alf ratios between 7 and 48) was prepared by acid leaching and characterized by using different physicochemical methods. The A1 content of the framework and the distribution of the tetrahedral and octahedral aluminum were determined by 27Al MAS NMR measurements and chemical analysis. Attempts to quantify the number of SiOH defect groups by ' %i MAS NMR measurements (following a procedure given in the literature) failed. The number of silanol groups (and Bransted sites) were determined using 'H MAS NMR investigations. The micro-and mesopore volumes of the samples were derived from measurements of the benzene adsorption isotherms. It was found that low dealumination of the H-mordenites transforms small-into large-port mordenites. The micropore volume diminished again at a high degree of dealumination.

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Mordenite Acidity:Dependence on the Si/Al Ratio and the Framework Aluminum Topology. Part 1. Sample Preparation and Physicochemical Characterization.-A series of dealuminated mordenites with Si/Al ratios between 7 and 48 is prepared by acid leaching (8 N HNO3, 338-385 K, 8-24 h) of commercial Na-mordenite and characterized by 27Al, 29Si, and 1H MAS NMR, and benzene adsorption or ammonia desorption measurements. The micro-and mesopore volumes increase with increasing dealumination up to a maximum at Si/Al ∼ =18 and then decrease slowly. The dealumination procedure increases the adsorption capacity for benzene. -(STACH, H.; JAENCHEN, J.; JERSCHKEWITZ, H.-G.; LOHSE, U.; PARLITZ, B.; ZIBROWIUS, B.; HUNGER, M.; J.