Adsorção dos gases NH3, NO e H2S em fosfato de vanadila, hidrogeno fosfato de vanadila e fosfatos de vanadila dopados por Al, Co, Mn e Cr

摘要

In this work were synthesized the materials called vanadyl phosphate, hydrogenvanadyl phosphate and vanadyl phosphate doped by transition metals with the aim inadsorption the following compounds: ammonia, hydrogen sulfide and nitrogen oxide. Tocharacterize the starting compounds was used DRX, FTIR, FRX and TG analysis. After thecharacterization of substrates, proceeded de adsorption of NH3 and H2S gases in reactor,passing the gases with continuous flow for 30 min and room temperature. Gravimetric dataindicate that the matrices of higher performance in adsorption of ammonia was those dopedby aluminum and manganese, obtaining results of 216,77 mgNH3/g and 200,40 mgNH3/g ofmatrix, respectively. The matrice of higher performance in adsorption of hydrogen sulfidewas that doped by manganese, obtaining results of 86,94 mgH2S/g of matrix. The synthesis ofsubstrates VOPO4.2H2O and MnVOPO4.2H2O with nitrogen oxide was made in solution,aiming the final products VOPO4.G.nH2O and MnVOPO4.G.nH2O (G = NO and n = numberof water molecules). The thermo analytical behavior and the infrared spectroscopy areindicative of formation of VOPO4.2,5NO.3H2O compound. Results of scanning electronmicroscopy (SEM) and Energy dispersive spectroscopy (EDS) of materials vanadyl phosphateand vanadyl phosphate modified after reaction in solid state or in solution with the gases showmorphology changes in substrates, beyond the formation of orthorhombic sulfur crystals overtheir respective hosts when these adsorb hydrogen sulfide