广州化工
廣州化工
엄주화공
GUANGZHOU CHEMICAL INDUSTRY AND TECHNOLOGY
2012年
8期
61-64,73
,共5页
纤维素苯甲酸酯%取代度%溶胀度%铂纳米簇%苯%环己烯
纖維素苯甲痠酯%取代度%溶脹度%鉑納米簇%苯%環己烯
섬유소분갑산지%취대도%용창도%박납미족%분%배기희
cellulose benzoyl ester%degree of substitution%swelling degree%Pt nano - cluster%benzene%cyclohexene
以N,N-二甲基乙酰胺/氯化锂(DMAc/LiCl)为溶剂溶解纤维素,吡啶(Py)为催化剂,苯甲酰氯为酯化剂在均相条件下进行酯化反应,通过控制苯甲酰氯的量得到了不同取代度(DS)的纤维素苯甲酸酯(CB),溶胀测试结果表明不同取代度的CB在苯、环己烯和环己烷中的溶胀度不同。将微波还原得到的铂纳米簇与CB杂化后得到Pt/CB杂化膜,并将其用于苯催化加氢反应中。利用FT-IR、XPS、XRD、DSC和TEM对不同取代度的CB和杂化膜的结构与性能进行了表征。研究发现膜的溶胀度直接影响苯的转化率和环己烯的选择性,活性评价结果显示,苯的转化率随着取代度的增大而增大,最高为7.29%;环己烯的选择性随取代度的增大而减小,最高为0.43%。
以N,N-二甲基乙酰胺/氯化鋰(DMAc/LiCl)為溶劑溶解纖維素,吡啶(Py)為催化劑,苯甲酰氯為酯化劑在均相條件下進行酯化反應,通過控製苯甲酰氯的量得到瞭不同取代度(DS)的纖維素苯甲痠酯(CB),溶脹測試結果錶明不同取代度的CB在苯、環己烯和環己烷中的溶脹度不同。將微波還原得到的鉑納米簇與CB雜化後得到Pt/CB雜化膜,併將其用于苯催化加氫反應中。利用FT-IR、XPS、XRD、DSC和TEM對不同取代度的CB和雜化膜的結構與性能進行瞭錶徵。研究髮現膜的溶脹度直接影響苯的轉化率和環己烯的選擇性,活性評價結果顯示,苯的轉化率隨著取代度的增大而增大,最高為7.29%;環己烯的選擇性隨取代度的增大而減小,最高為0.43%。
이N,N-이갑기을선알/록화리(DMAc/LiCl)위용제용해섬유소,필정(Py)위최화제,분갑선록위지화제재균상조건하진행지화반응,통과공제분갑선록적량득도료불동취대도(DS)적섬유소분갑산지(CB),용창측시결과표명불동취대도적CB재분、배기희화배기완중적용창도불동。장미파환원득도적박납미족여CB잡화후득도Pt/CB잡화막,병장기용우분최화가경반응중。이용FT-IR、XPS、XRD、DSC화TEM대불동취대도적CB화잡화막적결구여성능진행료표정。연구발현막적용창도직접영향분적전화솔화배기희적선택성,활성평개결과현시,분적전화솔수착취대도적증대이증대,최고위7.29%;배기희적선택성수취대도적증대이감소,최고위0.43%。
Cellulose benzoyl ester(CB) was synthesized with benzoyl chloride as the esterifying agent under homoge- neous conditions (cellulose was dissolved in DMAc/LiC1) in presence of pyridine (Py) as catalyst. Different substitution degree CBs were obtained by controlling the amount of benzoyl chloride, and the resulting CBs had different swelling de- gree in benzene, cyclohexene and cyclohexane. Hybrid membrane, used for the selective hydrogenation, was prepared by supporting Pt nano - clusters ( obtained by refluxing reduction by microwave) into CB. FT - IR, XRD, XPS and TEM were applied to characterize the CBs and the hybrid membranes. Research results demonstrated that swelling behavior ac- ted as a crucial factor to the conversion of benzene and selectivity of cyctohexene. Active evaluation results indicated that the conversion of benzene ( highest, 7.29% ) increased while the selectivity of cyclohexene ( highest, 0.43% ) decreased with the increasing of CBs substitution degree.