Synthesis of CrOx/Al2O3 catalyst in sol-gel conditions

A series of CrO$\text{}_{x}$/Al$\text{}_{2}$O$\text{}_{3}$ samples with various Cr/Al molar ratios (0.1-1.0) have been synthesized by the sol-gel technique from Al(C$\text{}_{3}$H$\text{}_{7}$O)$\text{}_{3}$ (aluminium isopropoxide) and chromic acid precursors. The synthesis applied allowed obtaining the final product in monolithic (nonfractured upon drying) form with no use of drying control chemical additives. All samples are characterized by thermal analysis, XRD, and TEM. The low temperature nitrogen adsorption measurements indicate the presence of mesopores. The use of the sol-gel technique permitted a high degree of homogeneity of binary systems up to the Cr/Al molar ratio of 0.5