A natural attapulgite (ATP)‐based catalyst, sulfated In2O3‐ATP (SO42-/In2O3‐ATP), was obtained by an impregnation‐calcination method and was used to efficiently and selectively produce the useful platform chem...A natural attapulgite (ATP)‐based catalyst, sulfated In2O3‐ATP (SO42-/In2O3‐ATP), was obtained by an impregnation‐calcination method and was used to efficiently and selectively produce the useful platform chemical 5‐hydroxymethylfurfural (HMF) from hexoses. Some important reaction param‐eters were studied, revealing that Lewis and Br-nsted acid sites on SO42-/In2O3‐ATP catalyze glu‐cose isomerization and fructose dehydration. The yields of HMF from glucose and fructose were 40.2%and 46.2%, respectively, using the optimal conditions of 180℃ for 60 min with 10 wt%of solid acid catalyst in a mixture of γ‐valerolactone‐water (9:1).展开更多
The MgO/NaY catalysts prepared by impregnation method were used for the conversion of glucose to fructose in water medium. The effects of MgO loading, reaction temperature, glucose concentration and reaction time on t...The MgO/NaY catalysts prepared by impregnation method were used for the conversion of glucose to fructose in water medium. The effects of MgO loading, reaction temperature, glucose concentration and reaction time on the catalytic performance for the reaction were studied. The activity testing results indicated that fructose could be generated effectively by controlling the components of the catalyst and reaction conditions. The maximal fructose yield of 33.8% with the selectivity of 67.3% was achieved over the 10%MgO/NaY catalyst at 100 ℃ for 2 h. Moreover, the catalysts were characterized by XRD, BET, and CO2-TPD techniques. The structural property of NaY with higher surface area facilitated glucose conversion, and the modulated basicity of the catalyst with MgO addition contributed to the formation of fructose in the tautornerization of aldose to ketose.展开更多
Well dispersion of tin species in an isolated form is a quite challenge since tin salts are easily hydrolyzed into(hydr)oxides during aqueous stannation of β-zeolite.In this study,immobilization of tin species on h...Well dispersion of tin species in an isolated form is a quite challenge since tin salts are easily hydrolyzed into(hydr)oxides during aqueous stannation of β-zeolite.In this study,immobilization of tin species on high silica commercial β-zeolite by using SnCl_2/Choline chloride(ChCl) complex followed with calcination provided a convenient way to get well dispersed Sn in β-zeolite in the aqueous condition,which was observed based on electron microscopy images,UV visible spectra and X-ray diffraction pattern.The existence of ChCl facilitated tin species to incorporate into zeolite.(1-2)wt%of Sn loaded β-zeolites exhibited good catalytic activity and high selectivity for glucose-fructose isomerization reaction.展开更多
基金supported by the Fundamental Research Funds for the Central Universities (TD2011-11,BLYJ201519)Beijing Higher Education Young Elite Teacher Project (YETP0765)+2 种基金National Natural Science Foundation of China (31170556)New Century Excellent Talents in University (NCET-13-0671)State Forestry Administration of China (201204803)~~
文摘A natural attapulgite (ATP)‐based catalyst, sulfated In2O3‐ATP (SO42-/In2O3‐ATP), was obtained by an impregnation‐calcination method and was used to efficiently and selectively produce the useful platform chemical 5‐hydroxymethylfurfural (HMF) from hexoses. Some important reaction param‐eters were studied, revealing that Lewis and Br-nsted acid sites on SO42-/In2O3‐ATP catalyze glu‐cose isomerization and fructose dehydration. The yields of HMF from glucose and fructose were 40.2%and 46.2%, respectively, using the optimal conditions of 180℃ for 60 min with 10 wt%of solid acid catalyst in a mixture of γ‐valerolactone‐water (9:1).
基金supported by the Natural Science Foundation of Anhui Province (No.1708085MB39)Natural Science Foundation of Liaoning Province (No.20141097)+2 种基金the National Natural Science Foundation of China (No.21206162)Open Project of State Key Laboratory of Solid Surface Physical Chemistry, Xiamen University (No.201412)Research Fund for Doctoral Program of Anhui Normal University (No. 2014bsqdjj41)
文摘The MgO/NaY catalysts prepared by impregnation method were used for the conversion of glucose to fructose in water medium. The effects of MgO loading, reaction temperature, glucose concentration and reaction time on the catalytic performance for the reaction were studied. The activity testing results indicated that fructose could be generated effectively by controlling the components of the catalyst and reaction conditions. The maximal fructose yield of 33.8% with the selectivity of 67.3% was achieved over the 10%MgO/NaY catalyst at 100 ℃ for 2 h. Moreover, the catalysts were characterized by XRD, BET, and CO2-TPD techniques. The structural property of NaY with higher surface area facilitated glucose conversion, and the modulated basicity of the catalyst with MgO addition contributed to the formation of fructose in the tautornerization of aldose to ketose.
基金supported by Aomori City Governmentthe Doctoral Program of Ministry of Education,Culture,Sport,Science,and Technology(MEXT),Japan
文摘Well dispersion of tin species in an isolated form is a quite challenge since tin salts are easily hydrolyzed into(hydr)oxides during aqueous stannation of β-zeolite.In this study,immobilization of tin species on high silica commercial β-zeolite by using SnCl_2/Choline chloride(ChCl) complex followed with calcination provided a convenient way to get well dispersed Sn in β-zeolite in the aqueous condition,which was observed based on electron microscopy images,UV visible spectra and X-ray diffraction pattern.The existence of ChCl facilitated tin species to incorporate into zeolite.(1-2)wt%of Sn loaded β-zeolites exhibited good catalytic activity and high selectivity for glucose-fructose isomerization reaction.