SYNTHESIS PROCEDURE AND PHYSICO-CHEMICAL CHARACTERIZATION OF ALUMINA SUPPORTED THORIA AND ........

Using thorium nitrate hexahydrate and the impregnating process, a series of alumina and K-ion modified supported thoria oxide catalysts (3–20 wt percent thoria oxide) were created at varying loading levels (3–20 wt percent thoria oxide). The catalysts were studied using diverse techniques such as N2 adsorption (BET-SA), Pore volume, X-ray diffraction, and Fourier Transform Infrared Spectrophotometry to better understand their catalytic function. With increasing the loading level of thoria and modifier K-ion, the total pore volume and average pore diameter were observed to decrease, which can be attributed to the filling of small pores and the narrowing of the pore diameter of the larger pores as a result of thorium deposition on the porous surface of the support. With increasing the loading level of thoria up to 20% wt%, XRD results of alumina supported thoria catalysts (xThAl) reveal the production of crystalline and scattered thoria on alumina. The development of carbonate on the surface of alumina supported thorium oxide catalysts increased as the loading level of thorium oxide rose, according to IR spectra. However, the modified catalyst produces more surface carbonate species, indicating that the modified catalysts boost the basicity of alumina and supported thoria catalysts by employing K-ion.

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