Synthesis of CrOx\text{}_{x}/Al2\text{}_{2}O3\text{}_{3}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

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

The influence of the small platinum clusters on hydrogen sorption properties

Hydrogen sorption abilities of Pt-B2O3/Al2O3 systems with different molar ratio of oxides obtained by sol-gel method were examined. Platinum was introduced by surface impregnation. Main goal of the research was to check an influence of metallic component (platinum) on sorption properties of B2O3/Al2O3 binary oxides. The oxide systems were characterized using XRD and TEM. Hydrogen adsorption was tested in the volumetric system and TPD measurements were taken. Results show that the amount of adsorbed hydrogen depends not only on the amount of platinum in the system but also on the type of oxide support and mainly on the content of boria