title: [Preparation by different methods and characterization of desulfurization mixed oxides derived from hydrotalcites].
abstract: Hydrotalcite-based MgAl mixed oxides were synthesized by urea hydrolysis and constant-pH coprecipitation methods, and characterized by means of X-ray diffraction (XRD) , thermal gravity analysis-differential thermal gravity (TG-DTG) , scanning electron microscope (SEM), N2-adsorption/desorption and CO2 temperature programmed desorption (CO2-TPD), and their adsorption performances for SO2 were also tested. It was found that MgAl mixed oxides prepared by coprecipitation method would facilitate the catalyst to maintain a high specific area (148. 1 m2.g-1) and more basic sites, which resulted in higher SO2 adsorption capacity and velocity. The SO2 adsorption capacity of the mixed oxides prepared by urea hydrolysis and constant-pH coprecipitation methods were 0.55 g.g-1and 0. 79 gg-1 respectively at 700 degreeC.
authors: Chun-Lei
authors: CL
authors: Zhu
authors: Hai-Lin
authors: HL
authors: Wang
authors: Chun-Bao
authors: CB
authors: Sun
mesh_terms: D000327:Adsorption; D000536:Aluminum Hydroxide / Q000737:chemistry*; D002384:Catalysis; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008276:Magnesium Hydroxide / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry*; D013696:Temperature; D014508:Urea / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D013458:Sulfur Dioxide; C010467:hydrotalcite; D000536:Aluminum Hydroxide; D014508:Urea; D008276:Magnesium Hydroxide