This project consists of four experimental sections and one theoretical part. In all experimental parts, SBA-15 was used as a high area surface silica substrate for the preparation of acid catalysts. Several catalysts with different weight of aluminium including 2.2, 6.1, 6.8 and 19% were prepared, and a covalent organic polymer based on triazine sulfonated on SBA-15. Also, two bimetallic catalysts consisting of aluminium and zirconium elements were constructed directly using Al(NO 3 ) 3 . 9H 2 O and ZrO(NO 3 ) 2 . xH 2 O, with tetraethyl orthoethyl silicate (TEOS) as a precursor for SBA-15. Structural and texture features of SBA-15 and catalysts prepared using XRD-low angle and XRD-wide angle, nitrogen absorption-desorption, FESEM, EDX/elemental mapping, ICP-OES, pyridine adsorption, TEM, CHNS and TGA were identified. The catalysts prepared were used in the fructose conversion to value-added materials. Dehydration of fructose to ethyl levulinate was performed using Al-5-SB catalyst. In order to improve the ethyl levulinate yield and increase its selectivity, the effect of various parameters on the reaction was investigated. In this reaction, the yield of 58% and 86% selectivity for ethyl levulinate by using 2.2% aluminium weight on the SBA-15 at 190 ? and 4 h with a 1: 1 ratio of catalyst and amount fructose was obtained in ethanol solvent. The catalytic activity of aluminium coated on SBA-15 was studied in the fructose dehydration to HMF using ultrasound at ambient temperature. In optimum conditions, with an amount of 8.6% aluminum weight, the power of 300 W, the reaction time of 2.5 h, the catalyst amount of 225 mg, and 300 mg of fructose in dimethyl sulfoxide as the solvent, HMF yield and 47% fructose conversion were gained 47 and 68%, respectively. The introduction of the triazine-based covalent organic polymer to SBA-15 and then its sulfonation to enhance the acidity of the catalyst showed a good activity to the conversion of fructose and other carbohydrates including glucose, sucrose and maltose to HMF. To improve the yield of HMF, the effective parameters on the reaction were optimized and reported at a reaction temperature of 120 ?, the reaction time of 1 h, 55 mg catalyst and 100 mg fructose, HMF yield and fructose conversion were obtained 78 and 99%, respectively. Two aluminium and zirconium metals were directly introduced into the SBA-15 with two different amounts of ZrO(NO 3 ) 2 . xH 2 O and the performance of these catalysts were investigated in the dehydration of fructose and other carbohydrates including glucose, sucrose and maltose to butyl levulinate. To obtain the maximum yield for Butyl Levulinate, the effect of different parameters on the reaction was investigated using the Taguchi experimental design. According to the results, Zr/Al (2) -SB catalyst containing more zirconium content at 170 ° C, the reaction time of 5 h, 50 mg catalyst, and initial concentration of fructose 10000 ppm was obtained maximum yield of butyl levulinate (72.8%). At the end of each section, in order to investigate the stability of the catalysts and their reusability, the dehydration reactions were carried out in several consecutive runs according to optimal reaction conditions. In the theoretical part, the absorption of glycerol in different states on the TiO 2 anatase surface (100) was performed using the density functional theory method. Also, the mechanism of conversion of glycerol to acrolein including two steps of loss of water molecules and one step tautomerization on TiO 2 anatase surface was investigated using the density functional theory method. Three paths for this reaction were proposed. Among these three paths, the third pathway was selected as an acceptable path because of having the minimum activation energy for the various steps of the route. Also, the energy absorption, reaction energy and the distances changes between atoms on the TiO 2 anatase surface were studied.