In order to improve the properties of alumina-carbon refractories,specimens were prepared using white fused corundum,zirconia-mullite and flake graphite as the raw materials,phenolic resin as the binder,adding differe...In order to improve the properties of alumina-carbon refractories,specimens were prepared using white fused corundum,zirconia-mullite and flake graphite as the raw materials,phenolic resin as the binder,adding different mass fractions(1.5%,2.0%,and 2.5%,respectively)of glass dust,cold isostatic pressing by 120 MPa,drying and firing at 900℃for 3 h.Effects of the glass dust addition on the apparent porosity,bulk density,cold modulus of rupture,hot modulus of rupture and thermal shock resistance were studied.The results show that the cold modulus of rupture of the specimens is improved significantly as the results of glass dust accelerating sintering.However,the hot modulus of rupture decreases.As the glass phase buffers the strain produced by thermal shock,the thermal shock resistance of alumina-carbon specimens is improved,especially for low carbon alumina-carbon materials.展开更多
To overcome the shortcomings of single component carrier supported platinum(Pt)-based catalysts,herein,we demonstrate the fabrication of alumina combined mesoporous carbon to prepare a series of alumina-carbon composi...To overcome the shortcomings of single component carrier supported platinum(Pt)-based catalysts,herein,we demonstrate the fabrication of alumina combined mesoporous carbon to prepare a series of alumina-carbon composites and their corresponding Pt-based catalysts.The alumina-carbon composites Al@PhFC are synthesized by using phloroglucinol-formaldehyde resin as carbon source and aluminum acetylacetone as the aluminum source.Further,the effect of alumina content on the properties of the composites is investigated.The composites and catalysts are characterized by using XRD,XPS,N2 sorption,and TEM.The Pt/Al@PhFC-1.8 composite with appropriate amounts of alumina,pore diameter,and moderate Pt nanoparticle size,resulted in 99.5%of conversion efficiency and 77.4%of optical selectivity in the asymmetric hydrogenation of ethyl 2-oxo-4-phenylbutanoate(EOPB).Intere stingly,this composite can be used more than 20 times without a significant decrease in its performance.展开更多
基金National Natural Science Foundation of China (51772277)the National Key R&D Program of China (2017YFB0304000)
文摘In order to improve the properties of alumina-carbon refractories,specimens were prepared using white fused corundum,zirconia-mullite and flake graphite as the raw materials,phenolic resin as the binder,adding different mass fractions(1.5%,2.0%,and 2.5%,respectively)of glass dust,cold isostatic pressing by 120 MPa,drying and firing at 900℃for 3 h.Effects of the glass dust addition on the apparent porosity,bulk density,cold modulus of rupture,hot modulus of rupture and thermal shock resistance were studied.The results show that the cold modulus of rupture of the specimens is improved significantly as the results of glass dust accelerating sintering.However,the hot modulus of rupture decreases.As the glass phase buffers the strain produced by thermal shock,the thermal shock resistance of alumina-carbon specimens is improved,especially for low carbon alumina-carbon materials.
基金supported by the National Natural Science Foundation of China(Nos.51603077,21603077)the Natural Science Foundation of Fujian Province(No.2019J01077)+2 种基金Marine High-Tech Industry Development Project of Fujian Province[No.(2016)17]Promotion Program for Young and Middle-AgedTeacher in Science and Technology Research of Huaqiao University(No.ZQN-PY516)Subsidized Project for Postgraduates’Innovative Fund in Scientific Research of Huaqiao University。
文摘To overcome the shortcomings of single component carrier supported platinum(Pt)-based catalysts,herein,we demonstrate the fabrication of alumina combined mesoporous carbon to prepare a series of alumina-carbon composites and their corresponding Pt-based catalysts.The alumina-carbon composites Al@PhFC are synthesized by using phloroglucinol-formaldehyde resin as carbon source and aluminum acetylacetone as the aluminum source.Further,the effect of alumina content on the properties of the composites is investigated.The composites and catalysts are characterized by using XRD,XPS,N2 sorption,and TEM.The Pt/Al@PhFC-1.8 composite with appropriate amounts of alumina,pore diameter,and moderate Pt nanoparticle size,resulted in 99.5%of conversion efficiency and 77.4%of optical selectivity in the asymmetric hydrogenation of ethyl 2-oxo-4-phenylbutanoate(EOPB).Intere stingly,this composite can be used more than 20 times without a significant decrease in its performance.
