_____________________________________________ 1 Research Scholar PDA Engineering College, Kalaburgi ,Karnataka, India 2 Department of I& P Engg.. PDA Engineering College, Kalaburgi Karnataka ,India SOLUTION COMBUSTIONING OF ALUMINA USING COMBINED UREA+CAMPHOR FUEL Bheem Mallappa K 1 , Dr. Prashant G Kamble 2 I. INTRODUCTION Nanocrystalline (γ) alumina is a polytype of alumina that find extensive applicat ions as a catalyst and catalytic supports due to its high surface area and porosity. These properties result primarily from the nano-scale character of the alumina. Many attempts have been made in literature to address the synthesis of gamma alumina by using kaolin [1,2], boehmite sol [3], saccharide molecule template [4] hydrothermal method [5,6] , precipitation method [7,8,9], sol-gel process [10,11], resin synthesis method [12] , solvothermal route [13], reduction–magnetic separation method [14]. But these methods are time consuming, expensive and complex. Solution Combustion Synthesis (SCS) provides simple, low cost fast process, with energy and time saving to produce pure nano crystalline ceramic powders [15]. (γ) alumina is synthesized by oxalyl dihydrazide (ODH) fuel which is hydrazine hydrate derivative and a carcinogenic. Except urea and camphor, most of the other fuels (ODH, carbohydrazide etc) used in the SCS are hydrazine derivatives. J.C .Toniolo et al [16] obtained amorphous product during aluminum nitrate camphor combustion with varying the oxidizer to fuel ratio. Only on heating as prepared powder to 1073 K γ alumina phase is formed. Usage of mixed fuel approach to synthesis various ceramics have been done earlier [17, 18, 19]. However, till now there is no report of synthesis of gamma alumina by Solution Combustion Synthesis using mixed fuel approach explaining the thermodynamic concept. In this work effect of mixed fuel approach using urea and camphor fuels on aluminiumnitrate fuel combustion was investigated. Theoretical temperature and enthalpy of reaction were calculated on thermodynamic concept and correlated with the measured temperature. Urea to camphor ratio was optimized to achieve pure gamma alumina phase in as prepared state. II. EXPERIMENTAL PROCEDURE The reactants analytical grade aluminium nitrate nonahydrate Al (NO3)3·9H2O was used as oxidizer. The urea Abstract- A Solution Combustion method used to synthesis nano crystalline γ-Alumina powders by reaction between aluminium nitrate as oxidizer and a mixture of urea and camphor fuel as reducer. stoichiometric fuel is Urea and camphor was added as excess fuel to alter the exothermicity of redox reaction between aluminium nitrate and urea. The ratio of urea to camphor had been optimized to obtain single phase gamma alumina. The variation of adiabatic flame temperature was calculated theoretically for different urea/camphor mixture ratios according to thermodynamic concept and correlated with the observed flame temperatures. These powders were characterized by XRD, SEM, An interpretation based on maximum combustion temperature and the amount of gases produced during reaction for various urea to camphor ratio composition had been proposed for the nature of combustion and its correlation with the characteristics of as synthesized Powder. Key Words: Solution Combustion Adiabatic flame temperature; Solution combustion route; multi fuel mixture, Multi channel thermocouple setup, X-ray diffraction. International Journal of Latest Trends in Engineering and Technology Vol.(16)Issue(1), pp.026-031 DOI: http://dx.doi.org/10.21172/1.164.04 e-ISSN:2278-621X