化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2012年
5期
1061-1064
,共4页
倪蓓%许杰%薛冰%刘平%李永昕
倪蓓%許傑%薛冰%劉平%李永昕
예배%허걸%설빙%류평%리영흔
氧化镁%甲醇%碳酸乙烯酯%碳酸二甲酯
氧化鎂%甲醇%碳痠乙烯酯%碳痠二甲酯
양화미%갑순%탄산을희지%탄산이갑지
MgO%methanol%ethylene carbonate%dimethylcarbonate
以硝酸镁为前体,通过等体积浸渍法制备不同负载量的MgO/NaY催化剂,用CO2-TPD和TEM对催化剂进行了表征,考察MgO负载量、反应温度、反应时间等条件对甲醇与碳酸乙烯酯(EC)酯交换反应合成对碳酸二甲酯(DMC)的影响。实验结果表明:MgO的负载量对催化剂表面的碱量和MgO分散程度有着重要影响。高分散的MgO物种越多,其催化剂碱量越高。采用12%MgO/NaY为催化剂、反应温度70℃、n(甲醇)∶n(EC)=8∶1、反应时间3 h时,EC的转化率和DMC的选择性最佳,DMC收率高达89%。
以硝痠鎂為前體,通過等體積浸漬法製備不同負載量的MgO/NaY催化劑,用CO2-TPD和TEM對催化劑進行瞭錶徵,攷察MgO負載量、反應溫度、反應時間等條件對甲醇與碳痠乙烯酯(EC)酯交換反應閤成對碳痠二甲酯(DMC)的影響。實驗結果錶明:MgO的負載量對催化劑錶麵的堿量和MgO分散程度有著重要影響。高分散的MgO物種越多,其催化劑堿量越高。採用12%MgO/NaY為催化劑、反應溫度70℃、n(甲醇)∶n(EC)=8∶1、反應時間3 h時,EC的轉化率和DMC的選擇性最佳,DMC收率高達89%。
이초산미위전체,통과등체적침지법제비불동부재량적MgO/NaY최화제,용CO2-TPD화TEM대최화제진행료표정,고찰MgO부재량、반응온도、반응시간등조건대갑순여탄산을희지(EC)지교환반응합성대탄산이갑지(DMC)적영향。실험결과표명:MgO적부재량대최화제표면적감량화MgO분산정도유착중요영향。고분산적MgO물충월다,기최화제감량월고。채용12%MgO/NaY위최화제、반응온도70℃、n(갑순)∶n(EC)=8∶1、반응시간3 h시,EC적전화솔화DMC적선택성최가,DMC수솔고체89%。
MgO/NaY catalysts prepared via wet impregnation method have been investigated for the catalytic synthesis of dimethyl carbonate (DMC) by the methanol with ethylene carbonate (EC) . Several techniques, including CO2-TPD, TEM, were applied to characterize the structure and basic properties of the as-synthesized catalysts. The effects of MgO loading amount, reaction temperature, reaction time, and the ratio of methanol to EC on the catalytic performance have been studied. The results demonstrated that the MgO-loading amount played an important role on the dispersion of MgO species and the basic property of catalysts. The best catalytic performance was obtained over the 12% MgO/NaY catalyst under 70 ℃ with a ratio of methanol to EC of 8 : 1, affording a remarkable DMC yield of 89%.