A 20 wt% Ni/bentonite catalyst was prepared by a solution combustion synthesis (SCS), which exhibited higher activity for the CO_2methanation than that of an impregnation method (IPM), and the catalyst prepared by SCS...A 20 wt% Ni/bentonite catalyst was prepared by a solution combustion synthesis (SCS), which exhibited higher activity for the CO_2methanation than that of an impregnation method (IPM), and the catalyst prepared by SCS showed a CO_2 conversion of 85% and a CH4selectivity of 100% at 300 °C, atmospheric pressure, and 3600 ml·(g cat)-1·h-1, and the catalyst exhibited stable within a 110-h reaction. The results showed higher me- tallic Ni dispersion, smaller Ni particle size, larger specific surface area and lower reduction temperature in the Ni/ bentonite prepared by SCS than that of IPM. And the Ni/bentonite prepared by the SCS moderated the interaction between NiO and bentonite.展开更多
Ni supported on bentonite was prepared by the impregnation method with different nickel contents, applied to the hydrogenation of nitrobenzene to aniline in a fixed-bed reactor, and it was characterized by X-ray diffr...Ni supported on bentonite was prepared by the impregnation method with different nickel contents, applied to the hydrogenation of nitrobenzene to aniline in a fixed-bed reactor, and it was characterized by X-ray diffraction（XRD）, H2-temperature programmed reduction（H2-TPR）, and X-ray photoelectron spectrometry（XPS）. The results showed that Ni/bentonite catalyst with 20 wt% nickel content provided a higher conversion of nitrobenzene and selectivity of aniline compared to other catalysts. NiO was the precursor of the active component of the catalyst, and the small crystallite size as well as the highly dispersed NiO on the Ni/bentonite-20 catalyst, contributed to the catalytic performance. The hydrogenation of nitrobenzene was carried out at 300℃ with a H_2 gaseous hourly space velocity of 4800 ml·（g cat）^-1·h^-1and a nitrobenzene liquid hourly space velocity of4.8 ml·（g cat）^-1·h^-1 over Ni/bentonite-20. A 95.7% nitrobenzene conversion and 98.8% aniline selectivity were obtained. While the nitrobenzene liquid hourly space velocity was 4.8 ml·（g cat）^-1·h^-1, the yield of aniline was more than 95.0% during a 10-hour reaction.展开更多
The effects of solution chemistry conditions and adsorbent surface properties on the adsorption of Ni(II) on Laiyang bentonite were investigated via the batch technique. Potentiometric and mass titration techniques we...The effects of solution chemistry conditions and adsorbent surface properties on the adsorption of Ni(II) on Laiyang bentonite were investigated via the batch technique. Potentiometric and mass titration techniques were employed in the batch experimental methods, and the results showed that the point of zero net proton charge(PZNPC) of bentonite at different ionic strength denoted p HPZNPC to be 8.2±0.1. The removal of Ni(II) from the solution increased with an increasing bentonite dosage, with the maximum removal efficiency equating up to 99%. The adsorption of Ni(II) on bentonite increased with an increasing p H value at a p H value of <8.5, and reached a Ni(II) removal efficiency of >99% at a p H value of >10.2. The Ni(II) adsorption performance exhibited different responses to cations(K+, Na+) but was not influenced by the background anions(NO3-, Cl-, and Cl O4-). The adsorption of Ni(II) was dominated by the outer-sphere surface complexation and ion exchange with Na+/H+ on bentonite surface at low p H value, whereas the inner-sphere surface complexation and surface precipitation were the main adsorption mechanisms at high p H value. The adsorption isotherms of Ni(II) on bentonite can be described well by the Langmuir model. The thermodynamic parameters of adsorption, including the Gibbs free energy, the enthalpy change, and the entropy change, at different temperatures indicated that the adsorption of Ni(II) on bentonite was endothermic and spontaneous.展开更多
The paper described pillarisations of natural bentonite from Pacitan East Java of Indonesia by using AI and Fe. Intercalation process by using surfactant molecule has also been carried out. Natural bentonite was inter...The paper described pillarisations of natural bentonite from Pacitan East Java of Indonesia by using AI and Fe. Intercalation process by using surfactant molecule has also been carried out. Natural bentonite was intercalated with HDTMA-Br （hexadecyltrimethylammonium-bromide） 1, 5% solution before pillared with AI and Fe metal to give HDTMA-bentonite forms. The ratio of bentonite and intercalating agent or pillaring agent was 1 gr/50 mL. The mixture was agitated, and then the solid phase was washed with distilled water. Then it was dried and calcined at 450℃ for 4 hours. Their catalytic activity and selectivity were studied for phenol hydroxylation using tlzOz （30%）. The reaction condition of this reaction was as follows： ratio of phenol/ H202 = 1：1 （molar ratio）, concentration of phenol = 1 M, reaction temperature was 60℃, and ratio of catalyst/phenol was 1：10. The products were hydroquinone and cathecol.展开更多
We synthesized vinylieriazolyl ketone through Knoevenagel reaction of α-triazolylpinacolone with 4-chlorophenyl acetaldehyde using KF-Al2O3 as a catalyst. The effect of the reaction conditions, such as the amount of ...We synthesized vinylieriazolyl ketone through Knoevenagel reaction of α-triazolylpinacolone with 4-chlorophenyl acetaldehyde using KF-Al2O3 as a catalyst. The effect of the reaction conditions, such as the amount of catalyst, temperature, the molar ratio of 4-chlorophenyl acetaldehyde to α-triazolylpinacolone and different PEGs was investigated. The optimum reaction conditions are: the molar ratio of 4-chlorophenyl acetaldehyde to α-triazolylpinacolone is 1.2∶1, reaction time is 0.5 h, reaction temperature is 75～80℃, the phase transfer is PEG4000. Under these conditions, the yield of vinylieriazolyl ketone could reach up to 95.2%.展开更多
基金Supported by the National Natural Science Foundation of China(21566005)the Natural Science Foundation of Guangxi Province(2016GXNSFFA380015)
文摘A 20 wt% Ni/bentonite catalyst was prepared by a solution combustion synthesis (SCS), which exhibited higher activity for the CO_2methanation than that of an impregnation method (IPM), and the catalyst prepared by SCS showed a CO_2 conversion of 85% and a CH4selectivity of 100% at 300 °C, atmospheric pressure, and 3600 ml·(g cat)-1·h-1, and the catalyst exhibited stable within a 110-h reaction. The results showed higher me- tallic Ni dispersion, smaller Ni particle size, larger specific surface area and lower reduction temperature in the Ni/ bentonite prepared by SCS than that of IPM. And the Ni/bentonite prepared by the SCS moderated the interaction between NiO and bentonite.
基金Supported by the National Natural Science Foundation of China(21566005,21425627)Natural Science Foundation of Guangxi province(2014GXNSFAA118049)+1 种基金the Open Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology(2013K011)the Patent Project of Colleges and Universities of Guangxi Zhuang Autonomous Region(KY2015ZL001)
文摘Ni supported on bentonite was prepared by the impregnation method with different nickel contents, applied to the hydrogenation of nitrobenzene to aniline in a fixed-bed reactor, and it was characterized by X-ray diffraction（XRD）, H2-temperature programmed reduction（H2-TPR）, and X-ray photoelectron spectrometry（XPS）. The results showed that Ni/bentonite catalyst with 20 wt% nickel content provided a higher conversion of nitrobenzene and selectivity of aniline compared to other catalysts. NiO was the precursor of the active component of the catalyst, and the small crystallite size as well as the highly dispersed NiO on the Ni/bentonite-20 catalyst, contributed to the catalytic performance. The hydrogenation of nitrobenzene was carried out at 300℃ with a H_2 gaseous hourly space velocity of 4800 ml·（g cat）^-1·h^-1and a nitrobenzene liquid hourly space velocity of4.8 ml·（g cat）^-1·h^-1 over Ni/bentonite-20. A 95.7% nitrobenzene conversion and 98.8% aniline selectivity were obtained. While the nitrobenzene liquid hourly space velocity was 4.8 ml·（g cat）^-1·h^-1, the yield of aniline was more than 95.0% during a 10-hour reaction.
基金Financial supports from the National Natural Science Foundation of China (51204104, 21201111,50774050, and 51474140)the Sponsored Research Foundation for Young Scientist of Shandong Province (BS2012CL026, BS2013CL001, and BS2013NJ019)+2 种基金the Shandong Postdoctoral Innovation Project (201202028)the China Postdoctoral Science Foundation (2012M521367)the Support Plan for Innovative Research Team of Shandong University of Science and Technology (2012KYTD102) are acknowledged
文摘The effects of solution chemistry conditions and adsorbent surface properties on the adsorption of Ni(II) on Laiyang bentonite were investigated via the batch technique. Potentiometric and mass titration techniques were employed in the batch experimental methods, and the results showed that the point of zero net proton charge(PZNPC) of bentonite at different ionic strength denoted p HPZNPC to be 8.2±0.1. The removal of Ni(II) from the solution increased with an increasing bentonite dosage, with the maximum removal efficiency equating up to 99%. The adsorption of Ni(II) on bentonite increased with an increasing p H value at a p H value of <8.5, and reached a Ni(II) removal efficiency of >99% at a p H value of >10.2. The Ni(II) adsorption performance exhibited different responses to cations(K+, Na+) but was not influenced by the background anions(NO3-, Cl-, and Cl O4-). The adsorption of Ni(II) was dominated by the outer-sphere surface complexation and ion exchange with Na+/H+ on bentonite surface at low p H value, whereas the inner-sphere surface complexation and surface precipitation were the main adsorption mechanisms at high p H value. The adsorption isotherms of Ni(II) on bentonite can be described well by the Langmuir model. The thermodynamic parameters of adsorption, including the Gibbs free energy, the enthalpy change, and the entropy change, at different temperatures indicated that the adsorption of Ni(II) on bentonite was endothermic and spontaneous.
文摘The paper described pillarisations of natural bentonite from Pacitan East Java of Indonesia by using AI and Fe. Intercalation process by using surfactant molecule has also been carried out. Natural bentonite was intercalated with HDTMA-Br （hexadecyltrimethylammonium-bromide） 1, 5% solution before pillared with AI and Fe metal to give HDTMA-bentonite forms. The ratio of bentonite and intercalating agent or pillaring agent was 1 gr/50 mL. The mixture was agitated, and then the solid phase was washed with distilled water. Then it was dried and calcined at 450℃ for 4 hours. Their catalytic activity and selectivity were studied for phenol hydroxylation using tlzOz （30%）. The reaction condition of this reaction was as follows： ratio of phenol/ H202 = 1：1 （molar ratio）, concentration of phenol = 1 M, reaction temperature was 60℃, and ratio of catalyst/phenol was 1：10. The products were hydroquinone and cathecol.
文摘We synthesized vinylieriazolyl ketone through Knoevenagel reaction of α-triazolylpinacolone with 4-chlorophenyl acetaldehyde using KF-Al2O3 as a catalyst. The effect of the reaction conditions, such as the amount of catalyst, temperature, the molar ratio of 4-chlorophenyl acetaldehyde to α-triazolylpinacolone and different PEGs was investigated. The optimum reaction conditions are: the molar ratio of 4-chlorophenyl acetaldehyde to α-triazolylpinacolone is 1.2∶1, reaction time is 0.5 h, reaction temperature is 75～80℃, the phase transfer is PEG4000. Under these conditions, the yield of vinylieriazolyl ketone could reach up to 95.2%.
