高校化学工程学报
高校化學工程學報
고교화학공정학보
JOURNAL OF CHEMICAL ENGINEERING OF CHINESE UNIVERSITIES
2014年
5期
979-984
,共6页
邓杭军%邓佳%陈纪忠
鄧杭軍%鄧佳%陳紀忠
산항군%산가%진기충
SBA-15介孔分子筛%磷钨酸%负载型催化剂%四氢呋喃开环聚合%催化性能
SBA-15介孔分子篩%燐鎢痠%負載型催化劑%四氫呋喃開環聚閤%催化性能
SBA-15개공분자사%린오산%부재형최화제%사경부남개배취합%최화성능
mesoporous silica SBA-15%phosphotungstic heteropolyacid%supported catalyst%ring-opening polymerization of THF%catalytic performance
以SBA-15为载体负载磷钨酸(HPW),用于催化四氢呋喃(THF)开环聚合,采用在线反应红外分析仪(ReactIR)测定THF转化率,实验考察了HPW负载质量百分比、3-氨丙基三乙氧基硅烷(APTES)/SBA-15质量比和载体SBA-15孔径等因素对催化剂的催化性能和THF转化率的影响。结果表明:采用直接浸渍法负载HPW,HPW最优负载质量百分比为40%;将SBA-15进行氨基改性后负载HPW,最优APTES/SBA-15质量比为mAPTES/mSBA-15=0.0712,且通过氨基改性可有效改善催化剂的重复利用性能;当载体 SBA-15的比表面积较大时(853 m2?g-1)或孔径较大(比表面积较小498~585 m2?g-1)时,所制备的催化剂具有较高的催化效率、聚合产物平均分子量较大,催化剂的催化效率和聚合产物分子量随着孔径增大而增大。
以SBA-15為載體負載燐鎢痠(HPW),用于催化四氫呋喃(THF)開環聚閤,採用在線反應紅外分析儀(ReactIR)測定THF轉化率,實驗攷察瞭HPW負載質量百分比、3-氨丙基三乙氧基硅烷(APTES)/SBA-15質量比和載體SBA-15孔徑等因素對催化劑的催化性能和THF轉化率的影響。結果錶明:採用直接浸漬法負載HPW,HPW最優負載質量百分比為40%;將SBA-15進行氨基改性後負載HPW,最優APTES/SBA-15質量比為mAPTES/mSBA-15=0.0712,且通過氨基改性可有效改善催化劑的重複利用性能;噹載體 SBA-15的比錶麵積較大時(853 m2?g-1)或孔徑較大(比錶麵積較小498~585 m2?g-1)時,所製備的催化劑具有較高的催化效率、聚閤產物平均分子量較大,催化劑的催化效率和聚閤產物分子量隨著孔徑增大而增大。
이SBA-15위재체부재린오산(HPW),용우최화사경부남(THF)개배취합,채용재선반응홍외분석의(ReactIR)측정THF전화솔,실험고찰료HPW부재질량백분비、3-안병기삼을양기규완(APTES)/SBA-15질량비화재체SBA-15공경등인소대최화제적최화성능화THF전화솔적영향。결과표명:채용직접침지법부재HPW,HPW최우부재질량백분비위40%;장SBA-15진행안기개성후부재HPW,최우APTES/SBA-15질량비위mAPTES/mSBA-15=0.0712,차통과안기개성가유효개선최화제적중복이용성능;당재체 SBA-15적비표면적교대시(853 m2?g-1)혹공경교대(비표면적교소498~585 m2?g-1)시,소제비적최화제구유교고적최화효솔、취합산물평균분자량교대,최화제적최화효솔화취합산물분자량수착공경증대이증대。
A catalyst synthesized by loading phosphotungstic heteropolyacid on mesoporous silica material SBA-15 support was used in ring-opening polymerization of tetrahydrofuran (THF). The polymerization of THF was monitored in real-time by ReactIR. The effects of mass fraction of HPW, the mass ratio of 3-aminopropyl-triethoxysilane (APTES) to SBA-15, and the pore diameter of SBA-15 on catalytic performance and the conversion of THF were investigated. It was found that the supported catalyst HPW/SBA-15 prepared by impregnation with 40% mass fraction of HPW exhibits the highest activity. The amino-functionalized SBA-15 can effectively improve the catalytic performance of catalyst HPW/NH2-SBA-15 for repeated use in THF polymerization. And the catalyst HPW/NH2-SBA-15 has the highest activity when the mass ratio of mAPTES/mSBA-15=0.0712. It shows good catalytic performance. Its PTHF product has higher molecular weight when SBA-15 has larger specific surface area or larger pore sizes (specific surface area=498~585 m2?g-1). Also, the catalytic performance of catalysts and the molecular weight of PTHF product increase with the pore size of SBA-15.