Mesoporous materials with the highest surface area were synthesized by hydrothermal treatment from coal-measure kaolin using cetyltrimethylammonium bromide（CTAB）as template.The effect of several factors on surface a...Mesoporous materials with the highest surface area were synthesized by hydrothermal treatment from coal-measure kaolin using cetyltrimethylammonium bromide（CTAB）as template.The effect of several factors on surface area of products also had been discussed.The products were characterized by FT- IR,HRTEM and N 2 adsorption and desorption isotherm plot methods.There was typical structure as Si-O,Si- OH and Si-O-Si of mesoporous materials in the framework of synthesized materials;the pore size distributions of the products showed a sharp peak at 3.82 nm.The effect of hydrothermal treatment time and the amount of template on the specific surface area of mesoporous materials was important,when the Surf/Si=0.135,and hydrothermal time=12 h,and the surface area of the product reached up to 1 070 m2/g,which was higher than other products.展开更多
A Y-zeolite-containing composite material with micro/mesoporous structure had been synthesized from kaolin by means of the in-situ crystallization method. The obtained samples were investigated by XRD and BET methods....A Y-zeolite-containing composite material with micro/mesoporous structure had been synthesized from kaolin by means of the in-situ crystallization method. The obtained samples were investigated by XRD and BET methods. Evaluation of catalytic activity of both the commercial Y-zeolite and the novel Y-zeolite-containing composite material was carried out in the pulse micro-chromatography platform with two probe molecules of different molecular sizes： VGO feedstock and 1,3,5 tri-isopropyl benzene. It was found that the Y-zeolite-containing composite material was richer in external surface and meso-/macro-pores; the Y-zeolite-containing composite material demonstrated a smaller rate of deactivation compared to the commercial Y-zeolite.展开更多
A direct synthesis method of preparing alkaline earth or transition metal oxides supporting mesoporous materials is reported. Distinguishing from those traditionaltechniques characterized by “synthesis at first and t...A direct synthesis method of preparing alkaline earth or transition metal oxides supporting mesoporous materials is reported. Distinguishing from those traditionaltechniques characterized by “synthesis at first and then modification”, this new method adds the precursor salts that have no perturbation in the strong acid synthetic system but easily form oxides after calcinations, into the initial syntheticmixture, performing the “synthesis” and “modification” in one-pot procedure.展开更多
Mesoporous LiFePO4 microspheres were simply synthesized by a low temperature(130℃),template-free hydrothermal route using low cost LiOH,Fe(NO3)3 and NH4H2PO4 as starting raw materials.These microspheres are composed ...Mesoporous LiFePO4 microspheres were simply synthesized by a low temperature(130℃),template-free hydrothermal route using low cost LiOH,Fe(NO3)3 and NH4H2PO4 as starting raw materials.These microspheres are composed of densely aggregated LiFePO4 nanoparticles and filled with interconnected mesochannels,which demonstrates not only a high tap density(≥1.4 g cm-3),a high capacity of 150 mAh g-1(～90% of its theoretical capacity) at 0.5 C rate,but also a ≥ 80% utilization of its theoretical capacity at a high rate of 1 C.In addition,the hydrothermal synthesis developed in this work is simple and cost-effective,it may provide a new route for production of the LiFePO4 material in battery applications.展开更多
Three-dimensional porous nitrogen-doped graphene aerogels （NGAs） were synthesized by using graphene oxide （GO） and chitosan （CS） via a self-assembly process by one-pot hydrothermal method. The morphology and str...Three-dimensional porous nitrogen-doped graphene aerogels （NGAs） were synthesized by using graphene oxide （GO） and chitosan （CS） via a self-assembly process by one-pot hydrothermal method. The morphology and struc- ture of the as-prepared materials were characterized by means of scanning electron microscopy, transmission elec- tron microscopy, X-ray diffraction, XPS spectroscopy, Raman spectroscopy, nitrogen adsorption/desorption meas- urement and Fourier transform infrared spectroscopy. The electrochemical performance of NGAs was studied by cyclic voltammetry, galvanostatic charge/discharge and impedance spectroscopy measurements. The microstructure, surface area and capacitance of NGAs could be facilely controlled by adding different amounts of chitosan. The prepared NGA-4 showed a specific capacitance of 148.0 F/g at the discharge current density of 0.5 A/g and also re- tained 95.3% of the initial capacitance after 5000 cycles at the scan rate of 10 mV/s. It provided a possible way to obtain graphene based materials with high surface area and capacitance.展开更多
The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16mimCl) was used as atemplate to prepare cerium-doped MCM-48 materials inbasic medium by a hydrothermal synthesis procedure. Theeffect of the amo...The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16mimCl) was used as atemplate to prepare cerium-doped MCM-48 materials inbasic medium by a hydrothermal synthesis procedure. Theeffect of the amount of Ce salt and C16mimCl/Si on thesynthesis were discussed in detail. This mesoporousmaterial exhibits a pore architecture which is cubic Ia3dgyroid and possesses a large surface area and a narrowpore distribution. Cerium in calcined porous frameworkexists in the form of well-dispersed tetrahedral coordination.The C16mimCl shows a high tendency toward selfaggregationthat allows the formation of the ceriumdopedgyroid mesostructure by using the appropriateamount of Ce salt.展开更多
基金Funded by Social Development Plan of Jiangsu Department of the Science and Technology,Jiangsu,China(No.BS2007038)
文摘Mesoporous materials with the highest surface area were synthesized by hydrothermal treatment from coal-measure kaolin using cetyltrimethylammonium bromide（CTAB）as template.The effect of several factors on surface area of products also had been discussed.The products were characterized by FT- IR,HRTEM and N 2 adsorption and desorption isotherm plot methods.There was typical structure as Si-O,Si- OH and Si-O-Si of mesoporous materials in the framework of synthesized materials;the pore size distributions of the products showed a sharp peak at 3.82 nm.The effect of hydrothermal treatment time and the amount of template on the specific surface area of mesoporous materials was important,when the Surf/Si=0.135,and hydrothermal time=12 h,and the surface area of the product reached up to 1 070 m2/g,which was higher than other products.
文摘A Y-zeolite-containing composite material with micro/mesoporous structure had been synthesized from kaolin by means of the in-situ crystallization method. The obtained samples were investigated by XRD and BET methods. Evaluation of catalytic activity of both the commercial Y-zeolite and the novel Y-zeolite-containing composite material was carried out in the pulse micro-chromatography platform with two probe molecules of different molecular sizes： VGO feedstock and 1,3,5 tri-isopropyl benzene. It was found that the Y-zeolite-containing composite material was richer in external surface and meso-/macro-pores; the Y-zeolite-containing composite material demonstrated a smaller rate of deactivation compared to the commercial Y-zeolite.
文摘A direct synthesis method of preparing alkaline earth or transition metal oxides supporting mesoporous materials is reported. Distinguishing from those traditionaltechniques characterized by “synthesis at first and then modification”, this new method adds the precursor salts that have no perturbation in the strong acid synthetic system but easily form oxides after calcinations, into the initial syntheticmixture, performing the “synthesis” and “modification” in one-pot procedure.
基金supported by the National Basic Research Program of China (2009CB220103)
文摘Mesoporous LiFePO4 microspheres were simply synthesized by a low temperature(130℃),template-free hydrothermal route using low cost LiOH,Fe(NO3)3 and NH4H2PO4 as starting raw materials.These microspheres are composed of densely aggregated LiFePO4 nanoparticles and filled with interconnected mesochannels,which demonstrates not only a high tap density(≥1.4 g cm-3),a high capacity of 150 mAh g-1(～90% of its theoretical capacity) at 0.5 C rate,but also a ≥ 80% utilization of its theoretical capacity at a high rate of 1 C.In addition,the hydrothermal synthesis developed in this work is simple and cost-effective,it may provide a new route for production of the LiFePO4 material in battery applications.
基金We are grateful to Research Center of Laser Fusion, China Academy of Engineering Physics. This work was financially supported by the National Natural Science Foundation of China （No. 51502274）, the Research Fund for the Doctoral Program of Southwest University of Science and Technology （Nos. 13zx7124, 15zx7137, 16zx7142） and the Research Fund for Joint Laboratory for Extreme Conditions Matter Properties （Nos. 13zxjk04, 14tdjk03）.
文摘Three-dimensional porous nitrogen-doped graphene aerogels （NGAs） were synthesized by using graphene oxide （GO） and chitosan （CS） via a self-assembly process by one-pot hydrothermal method. The morphology and struc- ture of the as-prepared materials were characterized by means of scanning electron microscopy, transmission elec- tron microscopy, X-ray diffraction, XPS spectroscopy, Raman spectroscopy, nitrogen adsorption/desorption meas- urement and Fourier transform infrared spectroscopy. The electrochemical performance of NGAs was studied by cyclic voltammetry, galvanostatic charge/discharge and impedance spectroscopy measurements. The microstructure, surface area and capacitance of NGAs could be facilely controlled by adding different amounts of chitosan. The prepared NGA-4 showed a specific capacitance of 148.0 F/g at the discharge current density of 0.5 A/g and also re- tained 95.3% of the initial capacitance after 5000 cycles at the scan rate of 10 mV/s. It provided a possible way to obtain graphene based materials with high surface area and capacitance.
基金the Natural Science Foundation of Yunnan Province/China(Grant No.2003E0005Z).
文摘The long-chain ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16mimCl) was used as atemplate to prepare cerium-doped MCM-48 materials inbasic medium by a hydrothermal synthesis procedure. Theeffect of the amount of Ce salt and C16mimCl/Si on thesynthesis were discussed in detail. This mesoporousmaterial exhibits a pore architecture which is cubic Ia3dgyroid and possesses a large surface area and a narrowpore distribution. Cerium in calcined porous frameworkexists in the form of well-dispersed tetrahedral coordination.The C16mimCl shows a high tendency toward selfaggregationthat allows the formation of the ceriumdopedgyroid mesostructure by using the appropriateamount of Ce salt.
