Preparation and Performance of Lanthanum Manganate Perovskite Desulfurizer

Abstract:

Perovskite lanthanum manganate hightemperature desulfurizer was prepared using lanthanum nitrate, manganese nitrate, and zeolite as the support via citric acid method. The fabrication, phase, and microstructure of asprepared adsorbents were characterized by the nitrogen adsorption/desorption, Xray diffraction, and scanning electron microscope and energy dispersive Xray spectrum techniques, respectively. The desulphurization mechanism was investigated based on the characterization results. The effects of reaction temperature, space velocity, inlet hydrogen sulfide content, and the support on desulphurization performance were studied. The results show that the desulfurizer has a high breakthrough sulfur capacity and exhibits a high degree of purification in the temperature range of 500 to 700 ℃, and the optimal reaction temperature is 600 ℃. As the space velocity and inlet hydrogen sulfide content increase, the breakthrough sulfur capacity and breakthrough time decrease. Compared to aluminium oxide and nanosilica, zeolite supported perovskite lanthanum manganate desulfurizer has a larger breakthrough sulfur capacity and a higher desulfurization precision.