This paper presents experimental data on the thermal conductivity for three types of adsorbent, namely, pure CaCl2 powder, simple composite adsorbent and consolidated composite adsorbent. The thermal conductivities were measured by the "hot wire method" at a fixed pressure and temperature under an ammonia atmosphere. Effective thermal conductivities of the expanded graphite-CaCl2 center dot nNH(3) (n = 2, 4, 8) consolidated composite adsorbent are in the range of 7.05-9.2 W m(-1) K-1, which are significant higher values than those of the powders bed of 0.3-0.4 W m(-1) K-1. The obtained results show that the composite adsorbent thermal conductivity lambda has a strong dependence on the bulk density, the weight fraction of expanded graphite and the ammoniated state of CaCl2. (c) 2005 Elsevier Ltd. All rights reserved.