Catalytic oxidative decomposition of H2S over MoS2/gamma-Al2O3
FUEL
Authors: Vaiano, Vincenzo; Barba, Daniela; Palma, Vincenzo; Colozzi, Michele; Palo, Emma; Barbato, Lucia; Cortese, Simona; Miccio, Marino
Abstract
MoS2 phases supported on Al2O3 with different content in the range 5-20 wt% were prepared, characterized and tested as catalysts for the H2S oxidative decomposition for the simultaneous production of hydrogen and sulphur. The chemical-physical characterization results have evidenced a good dispersion of MoS2 on Al2O3 support. With respect to the Al2O3, MoS2 loading influenced particularly the value of H-2 yield and minimized the SO2 production without substantial differences in H2S conversion (similar to 50%). In particular, the highest H-2 yield was observed for the catalyst having a nominal MoS2 loading of 10 wt%. A predictive mathematical model of the H2S oxidative decomposition reaction in presence of 10 wt% MoS(2)based catalyst was developed through the identification of the main reactions occurring in the system. The predictive capability of the model was verified in the temperature range between 1073 and 1273 K by varying also the H2S inlet concentration.
Effects of Dietary Mannan-Oligosaccharides and Phytase Supplementation Alone or in Combination on Growth Performance, Serum Metabolites, Cecal Microbiota Activity and Intestinal Morphology in Broiler Chickens
POULTRY SCIENCE JOURNAL
Authors: Karimian, R. A.; Rezaeipour, V
Abstract
This study evaluated the effect of a combination of mannan-oligosaccharides (MOS) and microbial phytase (MP) on growth performance, some blood biochemical metabolites, intestinal morphology and cecal microbial population of ROSS 308 broiler chickens from d 0 to 35 of age. A total of 200 one-day-old broiler chickens (mixed sex) were randomly distributed into four treatments with five replicates and 10 birds per each. The dietary treatments included a basal diet, the basal diet supplemented with MOS (as 2 g/kg of diet), MP (as 100 g/t Phyzyme XP 5000), and the combination of MOS and MP (MOS+MP). Supplementation of MOS+MP improved feed conversion ratio and body weight gain of broilers compared with the control group (P < 0.05). Dietary treatments had no significant effect on carcass traits. In the intestinal morphometric indices, villus length was greater in the birds which received MP individually or in combination with MOS (P < 0.05). Supplementation of MP, MOS or MOS+MP increased serum concentration of calcium in the broilers compared with control treatment (P < 0.05). Broiler chickens fed diets containing MOS+MP had lower numbers of E. coli, but higher count of Lactobacilli rather than control group (P < 0.05). Based on these results, it is concluded that dietary supplementation of MP in combination with MOS improved growth performance and intestinal microbial ecosystem of broiler chickens.