The solid solution （CeZr）02 catalyst was synthesized, and it was modified with metal oxides by incipient impreg- nation. Morphology and structure were characterized by X-ray diffraction, transmission electron micros...The solid solution （CeZr）02 catalyst was synthesized, and it was modified with metal oxides by incipient impreg- nation. Morphology and structure were characterized by X-ray diffraction, transmission electron microscope, ni- trogen ad/desorption and H2-temperature program reduction techniques. The catalytic properties of methane oxidation were also investigated. The results showed that solid solution possessed a mesoporous structure and exhibited excellent catalytic performance. The activity of solid solution was improved effectively by nickel dop- ing, and the optimal loading is 15 wt%. The stability of （CeZr）02 and modified （CeZr）02 indicated that the struc- ture of pristine solid solution played a key role in promoting molecules diffusion and spatial confining oxide particle sintering.展开更多
The aim of this study was to characterize 103 mango accessions of the field germplasm collection of Embrapa semi-arid region, located in Juazeiro, Bahia, Brazil and to apply 50 morphological descriptors established by...The aim of this study was to characterize 103 mango accessions of the field germplasm collection of Embrapa semi-arid region, located in Juazeiro, Bahia, Brazil and to apply 50 morphological descriptors established by the Brazilian Ministry of Agriculture, livestock and supply to help in the development of new mango cultivars for the Northeastern region of Brazil. Four trees were selected for each accession and eight adult leaves, eight flowers and 16 fruits were collected from each tree. Morphological characteristics ranging from plant size to seed embryo were evaluated. Simple percentages were estimated for all the descriptors. Only the descriptors for leaf symmetry and fruit waxiness did not show variability among the accessions. Eight accessions did not show fruits with fibers, while nine other accessions presented flesh firmness, which is an important characteristic to improve breeding. The soluble solids content was high, above 14 ~Brix for 95% of the accessions with Tommy Atkins showing the lowest value, 12.5 ~Brix. A great diversity was found in the color of the epidermis ranging from green to red. The accessions Amrapali and Salitre presented a dark orange flesh color. The obtained data set, are the most comprehensive so far in Brazil, it allows choosing the best parents to develop new cultivars and will also contribute to the protection of mango cultivars in Brazil.展开更多
基金Supported by the National Natural Science Foundation of China(21136007 and51572185)the Natural Science Foundation of Shanxi Province(2014011016-4)the Coal-Based Key Scientific and Technological Project of Shanxi Province(MQ2014-10)
文摘The solid solution （CeZr）02 catalyst was synthesized, and it was modified with metal oxides by incipient impreg- nation. Morphology and structure were characterized by X-ray diffraction, transmission electron microscope, ni- trogen ad/desorption and H2-temperature program reduction techniques. The catalytic properties of methane oxidation were also investigated. The results showed that solid solution possessed a mesoporous structure and exhibited excellent catalytic performance. The activity of solid solution was improved effectively by nickel dop- ing, and the optimal loading is 15 wt%. The stability of （CeZr）02 and modified （CeZr）02 indicated that the struc- ture of pristine solid solution played a key role in promoting molecules diffusion and spatial confining oxide particle sintering.
文摘The aim of this study was to characterize 103 mango accessions of the field germplasm collection of Embrapa semi-arid region, located in Juazeiro, Bahia, Brazil and to apply 50 morphological descriptors established by the Brazilian Ministry of Agriculture, livestock and supply to help in the development of new mango cultivars for the Northeastern region of Brazil. Four trees were selected for each accession and eight adult leaves, eight flowers and 16 fruits were collected from each tree. Morphological characteristics ranging from plant size to seed embryo were evaluated. Simple percentages were estimated for all the descriptors. Only the descriptors for leaf symmetry and fruit waxiness did not show variability among the accessions. Eight accessions did not show fruits with fibers, while nine other accessions presented flesh firmness, which is an important characteristic to improve breeding. The soluble solids content was high, above 14 ~Brix for 95% of the accessions with Tommy Atkins showing the lowest value, 12.5 ~Brix. A great diversity was found in the color of the epidermis ranging from green to red. The accessions Amrapali and Salitre presented a dark orange flesh color. The obtained data set, are the most comprehensive so far in Brazil, it allows choosing the best parents to develop new cultivars and will also contribute to the protection of mango cultivars in Brazil.
