A new solid acid catalyst,SO4^2-/TiO2 modified with tin,was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption,X-ray powder diffraction,scanning electron...A new solid acid catalyst,SO4^2-/TiO2 modified with tin,was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption,X-ray powder diffraction,scanning electron microscopy,Fourier transform infrared spectroscopy,infrared spectroscopy of adsorbed pyridine,temperature-programmed desorption of ammonia and thermal gravimetric analysis.The structure,acidity and thermal stability of the SO4^2-/TiO2-SnO2 catalyst were studied.Incorporating tin enlarged the specific surface area and decreased crystallite size of the SO4^2-/TiO2 catalyst.The total acid sites of the modified catalyst increased and Bronsted acid strength remarkably increased with increasing tin content.The decomposition temperature of sulfate radical in the modified catalyst was 100 ℃ greater and its mass loss was more than twice that of the SO4^2-/TiO2 catalyst.The SO4^2-/TiO2-SnO2 catalyst was designed to synthesize 1,6-hexanediol diacrylate by esterification of 1,6-hexanediol with crylic acid.The yield of 1,6-hexanediol diacrylate exceeded 87% under the optimal reaction conditions：crylic acid to 1,6-hexanediol molar ratio = 3.5,catalyst loading = 7%,reaction temperature = 130 ℃ and reaction time = 3 h.The modified catalyst exhibited excellent reusability and after 10 cycles the conversion of 1,6-hexanediol was above 81%.展开更多
World Federation of Acupuncture-Moxibustion Societies(WFAS)Technical Benchmark of Acupuncture and Moxibustion:Electroacupuncture,developed under the leadership of Shanghai University of Traditional Chinese Medicine,wa...World Federation of Acupuncture-Moxibustion Societies(WFAS)Technical Benchmark of Acupuncture and Moxibustion:Electroacupuncture,developed under the leadership of Shanghai University of Traditional Chinese Medicine,was approved by WFAS.This technical benchmark was issued on October 9,2023,and implemented on December 31,2023.The main contents include the scope,normative references,terms and definitions,acupuncture and moxibustion procedures and rules,and safety.This article focuses on the above contents.An outlook on the application,popularization,and update plan of this technical benchmark is proposed.展开更多
文摘A new solid acid catalyst,SO4^2-/TiO2 modified with tin,was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption,X-ray powder diffraction,scanning electron microscopy,Fourier transform infrared spectroscopy,infrared spectroscopy of adsorbed pyridine,temperature-programmed desorption of ammonia and thermal gravimetric analysis.The structure,acidity and thermal stability of the SO4^2-/TiO2-SnO2 catalyst were studied.Incorporating tin enlarged the specific surface area and decreased crystallite size of the SO4^2-/TiO2 catalyst.The total acid sites of the modified catalyst increased and Bronsted acid strength remarkably increased with increasing tin content.The decomposition temperature of sulfate radical in the modified catalyst was 100 ℃ greater and its mass loss was more than twice that of the SO4^2-/TiO2 catalyst.The SO4^2-/TiO2-SnO2 catalyst was designed to synthesize 1,6-hexanediol diacrylate by esterification of 1,6-hexanediol with crylic acid.The yield of 1,6-hexanediol diacrylate exceeded 87% under the optimal reaction conditions：crylic acid to 1,6-hexanediol molar ratio = 3.5,catalyst loading = 7%,reaction temperature = 130 ℃ and reaction time = 3 h.The modified catalyst exhibited excellent reusability and after 10 cycles the conversion of 1,6-hexanediol was above 81%.
基金Supported by National Key R&D Program of China:2019YFC1712200。
文摘World Federation of Acupuncture-Moxibustion Societies(WFAS)Technical Benchmark of Acupuncture and Moxibustion:Electroacupuncture,developed under the leadership of Shanghai University of Traditional Chinese Medicine,was approved by WFAS.This technical benchmark was issued on October 9,2023,and implemented on December 31,2023.The main contents include the scope,normative references,terms and definitions,acupuncture and moxibustion procedures and rules,and safety.This article focuses on the above contents.An outlook on the application,popularization,and update plan of this technical benchmark is proposed.
