This paper presents experimental data on the thermal conductivity for three types of adsorbent, namely, pure CaCl 2 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–CaCl 2 ·nNH 3 (n=2, 4, 8) consolidated composite adsorbent are in the range of 7.05–9.2Wm −1 K −1 , which are significant higher values than those of the powders bed of 0.3–0.4Wm −1 K −1 . The obtained results show that the composite adsorbent thermal conductivity λ has a strong dependence on the bulk density, the weight fraction of expanded graphite and the ammoniated state of CaCl 2 .