Mesoporous molecular sieves Al-MCM-41 with n（SiO2）/n（Al2O3） ratio being 20,50 and 100 were prepared.As proved by X-ray diffraction（XRD） patterns and the N2 physical sorption,the as-synthesized Al-MCM-41 exhibite...Mesoporous molecular sieves Al-MCM-41 with n（SiO2）/n（Al2O3） ratio being 20,50 and 100 were prepared.As proved by X-ray diffraction（XRD） patterns and the N2 physical sorption,the as-synthesized Al-MCM-41 exhibited typical hexagonal structure,large surface areas and narrow pore distribution.The performance of HAl-MCM-41 as catalyst for tert-butylation of p-cresol with methyl tert-butyl-ether（MTBE） was then investigated.The effects of temperature,weight hourly space velocity（WHSV） and the feed ratio n（MTBE）/n（p-cresol） on p-cresol conversion and product selectivity were examined.The results showed that mesoporous HAl-MCM-41 molecular sieves（n（SiO2）/n（Al2O3） = 20） is an efficient catalyst with high activity,selectivity and stability for the synthesis of 2-tert-butyl-p-cresol from p-cresol and MTBE by tert-butylation.展开更多
A mild and efficient procedure to build up various chromone-2-carboxylates was developed. Condensation of diverse 2-hydroxyacetophones with tetr-butyl oxalate in the presence of sodium ethoxide could be accomplished r...A mild and efficient procedure to build up various chromone-2-carboxylates was developed. Condensation of diverse 2-hydroxyacetophones with tetr-butyl oxalate in the presence of sodium ethoxide could be accomplished rapidly under mild condition. Cyclodehydration was carried out to achieve chromone-2-carboxylates in one-pot with impressive yield. Advantages over conventional methods with diethyl oxalate were observed in yield and reaction time.展开更多
以十二胺(DDA)为模板剂,正硅酸乙酯为硅源,采用一步合成法合成了双金属负载型Fe-V-HMS介孔分子筛催化剂,并通过FT-IR、XRD等手段对其进行了表征分析。以叔丁基过氧化氢为氧化剂,对Fe-V-HMS催化氧化脱除以正庚烷为溶剂的模拟油中的二苯...以十二胺(DDA)为模板剂,正硅酸乙酯为硅源,采用一步合成法合成了双金属负载型Fe-V-HMS介孔分子筛催化剂,并通过FT-IR、XRD等手段对其进行了表征分析。以叔丁基过氧化氢为氧化剂,对Fe-V-HMS催化氧化脱除以正庚烷为溶剂的模拟油中的二苯并噻吩进行了活性评价。采用单因素法考察了催化剂用量、反应温度、反应时间、氧化剂用量对氧化脱硫效果的影响。结果表明:FeV-HMS催化剂可有效催化氧化脱除模拟油中的二苯并噻吩,在反应温度60℃、反应时间30 min、氧化剂用量0.03 m L、催化剂用量0.03 g、模拟油5 m L的条件下,脱硫率达到97.41%。介孔分子筛催化剂具有良好的化学性质和热稳定性,在催化领域有着很好的应用前景。展开更多
文摘Mesoporous molecular sieves Al-MCM-41 with n（SiO2）/n（Al2O3） ratio being 20,50 and 100 were prepared.As proved by X-ray diffraction（XRD） patterns and the N2 physical sorption,the as-synthesized Al-MCM-41 exhibited typical hexagonal structure,large surface areas and narrow pore distribution.The performance of HAl-MCM-41 as catalyst for tert-butylation of p-cresol with methyl tert-butyl-ether（MTBE） was then investigated.The effects of temperature,weight hourly space velocity（WHSV） and the feed ratio n（MTBE）/n（p-cresol） on p-cresol conversion and product selectivity were examined.The results showed that mesoporous HAl-MCM-41 molecular sieves（n（SiO2）/n（Al2O3） = 20） is an efficient catalyst with high activity,selectivity and stability for the synthesis of 2-tert-butyl-p-cresol from p-cresol and MTBE by tert-butylation.
文摘A mild and efficient procedure to build up various chromone-2-carboxylates was developed. Condensation of diverse 2-hydroxyacetophones with tetr-butyl oxalate in the presence of sodium ethoxide could be accomplished rapidly under mild condition. Cyclodehydration was carried out to achieve chromone-2-carboxylates in one-pot with impressive yield. Advantages over conventional methods with diethyl oxalate were observed in yield and reaction time.
文摘以十二胺(DDA)为模板剂,正硅酸乙酯为硅源,采用一步合成法合成了双金属负载型Fe-V-HMS介孔分子筛催化剂,并通过FT-IR、XRD等手段对其进行了表征分析。以叔丁基过氧化氢为氧化剂,对Fe-V-HMS催化氧化脱除以正庚烷为溶剂的模拟油中的二苯并噻吩进行了活性评价。采用单因素法考察了催化剂用量、反应温度、反应时间、氧化剂用量对氧化脱硫效果的影响。结果表明:FeV-HMS催化剂可有效催化氧化脱除模拟油中的二苯并噻吩,在反应温度60℃、反应时间30 min、氧化剂用量0.03 m L、催化剂用量0.03 g、模拟油5 m L的条件下,脱硫率达到97.41%。介孔分子筛催化剂具有良好的化学性质和热稳定性,在催化领域有着很好的应用前景。
