A series of tungstate-impregnated aluminium phosphate samples are prepared by varying the tungstate weight percent from 3 to 20 and characterised by XRD and Nz-adsorption-desorption method. Surface areas are found to decrease with increase in tungstate loading. However, tungstate-loaded samples exhibit an increasing trend in acidity and catalytic activity. The sample with 10 wt.% tungstate loading shows highest dehydration and dehydrogenation activity for isopropanol and cumene conversion, respectively. The low C-2(+) hydrocarbon selectivity indicates that the new acid sites formed due to tungstate impregnation is not strong enough to dehydrate methanol to hydrocarbons. (C) 2000 Elsevier Science B.V. All rights reserved.
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