NITROGEN OXIDES (NOX), PRODUCED BY COMBUSTION OF FOSSIL FUELS AT HIGH TEMPERATURES, HAVE CAUSED A VARIOUS HUMAN AND ENVIRONMENT PROBLEMS [1]. THEREFORE GREAT EFFORTS OF RESEARCHERS HAVE BEEN ATTRACTED TO LIMIT THE EMISSION OF NOX POLLUTANTS [2]. CATALYTIC REDUCTION OF NOX WITH AMMONIA IS A WELL-PROVEN AND EFFECTIVE TECHNOLOGY TO NOX CONTROL. IN THIS PROCESS, AMMONIA HAS BEEN EMPLOYED AS REDUCTANT WHICH CONVERTS NO INTO N2, N2O AND H2O VIA CATALYTIC REACTIONS [3]. IN THE PAST FEW DECADES, VARIOUS METAL OXIDES CONTAINING CATALYSTS (SUPPORTED, UNSUPPORTED AND/OR THEIR MIXED OXIDES) ARE BEING DEVELOPED IN CATALYTIC REDUCTION OF NOX [3-4].IN PRESENT STUDY, CEO2-MNOX Solid Solution CATALYSTS WITH DIFFERENT MN/(MN+CE) MOLAR RATIO (0, 0.25, 0.5, 0.75 AND 1) ARE PREPARED BY SOL-GEL METHOD. IN THE SYNTHESIS, CITRIC ACID IS USED AS THE COMPLEXATION AGENT WITH THE EQUIMOLAR OF TOTAL METAL IONS. THE GEL DECOMPOSITION ARE CARRIED OUT UNDER CONTROLLED CONDITION (HEATING AT 300 °C FOR 1 H) SO THAT GEL DECOMPOSED BY SELF-IGNITED COMBUSTION [5]. X-RAY DIFFRACTION (XRD), TEMPERATURE PROGRAMMED REDUCTION (H2-TPR) AND N2-ADSORPTION (BET) ANALYSES ARE CONDUCTED TO CHARACTERIZE THE PHYSICAL-CHEMICAL PROPERTIES OF THE CATALYSTS. THE XRD DIFFRACTO GRAMS OF CATALYSTS WITH MN/(MN+CE) MOLAR RATIO 0.25, 0.5, 0.75 SHOWED DIFFRACTION PEAKS ATTRIBUTED TO CUBIC FLUORITE STRUCTURE OF CEO2 (JCPDS #34-0394) AND NO DIFFRACTION PEAKS RELATED TO MN PHASES WERE RECOGNIZED. THE XRD RESULTS REPRESENT THAT MN ATOMS CAN BEEN REPLACED INSTEAD OF SOME CE SITES IN THE CEO2 LATTICE TO FORM A Solid Solution CATALYST. FURTHERMORE, IT IS PROBABLE THAT THE NANO SIZED MNOX PHASES HAVE BEEN FORMED BESIDE THE CEO2 LATTICE TO PRODUCE A NANO COMPOSITE CATALYST. H2-TPR ANALYSIS CONFIRMED ADDITION OF MN SPECIES INTO CEO2, LEADS TO SHIFT THE REDUCTION TEMPERATURES TO LOWER TEMPERATURES. IT SUGGESTS THAT THERE IS A STRONG INTERACTION OR SYNERGISTIC EFFECTS BETWEEN THE CE AND MN SPECIES.THE ACTIVITY OF PREPARED Solid Solution CATALYSTS IS EVALUATED IN CATALYTIC REMOVAL OF NOX WITH AMMONIA IN A GAS HOURLY SPACE VELOCITY (GHSV) OF 12000 H-1. IT WAS FOUND THAT THE CATALYTIC PERFORMANCE OF CEO2-MNOX MIXED OXIDES WAS STRONGLY INFLUENCED BY THE MOLAR RATIO OF MN. THE CEO2-MNOX (0.25) EXHIBITED HIGHEST CATALYTIC ACTIVITY AT LOW TEMPERATURE OF 200 °C (83% NO CONVERSION AND 68% N2 YIELD). IT CAN ASCRIBE TO PRESENCE OF WELL DISPERSED EASILY REDUCIBLE SITES OF MN4+ AND MN3+ AND SYNERGISTIC EFFECT BETWEEN CE AND MN THAT ARE APPROVED BY XRD AND H2-TPR RESULTS.

LITI2 (PO4) 3 BASED COMPOUNDS WITH NASICON TYPE STRUCTURES ARE KNOWN AS LOW TEMPERATURE Solid ELECTROLYTES WITH FAST LI+ION TRANSPORT. SUBSTITUTION OF TI4+→M3++LI+ IN THE SYSTEM LI1+X MXTI2−X (PO4) 3 (WHERE M=FE, SC, AL, Y, B, IN, GA) LEADS TO HIGHER CONDUCTIVITIES BY SEVERAL ORDERS HIGHER THAN THOSE OF HOST COMPOUNDS. LI1.3AL0.3TI1.7 (PO4)3 (LATP) IS ONE OF THE MOST HIGHLY CONDUCTIVE, AIR STABLE, LITHIUM CERAMIC ELECTROLYTES THAT HAVE BEEN USED IN LI-AIR BATTERIES RECENTLY AS Solid ELECTROLYRE INTERFACE. THE SIGNIFICANT ADVANTAGE OF CERAMIC BASED ARTIFICIAL SEI IN LI AIR BATTERIES IS THAT IT PROTECTS THE LITHIUM METAL FROM ALL ATMOSPHERIC CONTAMINATION. MOST STUDIES ON LATP HAVE ADOPTED Solid STATE REACTION AND MELTING–QUENCHING METHODS FOR THE LATP PREPARATION. THESE METHODS CANNOT BE EASILY APPLIED TO THE MASS PRODUCTION DUE TO HIGH ENERGY CONSUMPTION AND CONTAMINATION OF IMPURITIES IN THE FINAL PRODUCTS. ON THE OTHER HAND Solution BASED SYNTHESIS METHOD FAVORS THE PREPARATION OF POWDER WITH CONTROLLED COMPOSITION AND METALLURGY. IN THIS STUDY WE HAVE PREPARED LATP POWDERS BY A Solution BASED SYNTHESIS METHOD CONTINUED BY SINTERING TO OBTAIN THE HIGHEST IONIC CONDUCTIVITY.50 ML OF NH4OH AND 25 ML OF TI (OC3H8) 4 WAS USED AS PRECURSOR PRODUCING A WHITE GELATINOUS PRECIPITATE. THE PRECIPITATE WAS WASHED WITH 500 ML OF DEIONIZED WATER TO REMOVE THE EXCESS BASE AND PLACED IN 100 ML OF DEIONIZED WATER. TO THIS Solution WAS ADDED 200 ML OF A 1 M Solution OF ANHYDROUS OXALIC ACID. AL (NO3) 3·9H2O, (NH4) 2HPO4, AND 5% EXCESS LINO3 WERE ADDED UNDER STIRRING WITH STOICHIOMETRIC RATIOS TO THE Solution. THE FINAL Solution WAS THEN HEATED ON A HOT PLATE UNTIL ALL THE WATER WAS EVAPORATED, WHICH PRODUCES A WHITE PRECIPITATE OF WELL MIXED PRECURSORS FOR ANNEALING.