Comparative research on the catalytic activities of different molecular sieves for acetalization and

来源 :Chinese Science Bulletin | 被引量 : 0次 | 上传用户:woainiyuying
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Molecular sieves with different acidities and pore-sizes have been applied to catalyze the acetalization and ketalization of carbonyl compounds with glycol. A comparative research on the catalytic activities of the catalysts for certain reactions has been carried out to figure out the relationship between the characters of the catalysts and the activities. The results show that the pore-size of the molecular sieves is one of the most important factors that determine the catalytic activity. Appropriate pore-size is needed for the certain reaction.The acidity is another factor that affects the activities. They also have great effects on the recycled activities of the catalysts. Molecular sieves with different acidities and pore-sizes have been applied to catalyze the acetalization and ketalization of carbonyl compounds with glycol. A comparative research on the catalytic activities of the catalysts for certain reactions has been carried out to figure out the relationship between the characters of the catalysts and the activities. The results show that the pore-size of the molecular sieves is one of the most important factors that determine the catalytic activity. Appropriate pore-size is needed for the certain reaction. The acidity is another factor that affects the activities. They also have great effects on the recycling activities of the catalysts.
其他文献
康柏近日在新加坡兴建了一家投资一亿美元的电脑厂,同时推出了一系列家用电脑产品,从而在亚洲迅速增长的经济市场中扩大了它的影响,并期望也能扩大其市场份额。 Compaq rec
The title complex [(C8H9NO2)·HgI2]n has been synthesized from the reaction of pyridine-3-ethylformate with mercury iodide in the mixture of DMF and absolute me
在 GB18565—2001 《营运车辆综合性能要求和检验方法》滑行性能检验第12.5.1.2款中规定:“根据测试汽车的基准质量选定底盘测功机的相应当量惯量,当底盘测功机所配备的飞轮
摘要:在语文新课改实践中,取得了不少新的教学成果,但也存在一些矫枉过正的现象。本文结合课堂教学实例就新课改后在语文教材解读教学中出现的几个剑走偏锋的实例进行了分析和反思。  关键词:语文教学;新课标;教材解读;思考    新课程标准的颁布和新教材的推广为语文教学注入了活力。新课改伊始,我们欣喜地看到语文课堂教学悄悄地发生着变化:人文精神得到张扬,学生的主体性受到尊重,教学方法和手段更科学。然而,有
在其他条件相同的情况下,多媒体系统的性能直接取决于你在系统上花钱的多少,所以计算机专家们学会了在紧张的预算下筹建功能完备的系统,我称其为:采购高手。 With other thi
在微机上播放VCD影碟,需要安装MPEG卡(俗称解压卡、播放卡、电影卡)在家用电脑使用中,重要的内容是教育和娱乐,尤其是MPEG卡的价格回落,而软件播放还没有达到令人满意的效果
9月28日晚,由中国音乐家协会、中共陕西省委宣传部和陕西省文学艺术界联合会共同主办,陕西省音乐家协会承办的《从长安再出发》——大型交响音乐会在西安城墙南门瓮城成功举
<正>音乐教育理论是对音乐学习者学习的指导,对音乐教学论和音乐课堂教学起到至关重要的作用,是值得人们在音乐教学实践中不断探索的重要内容。随着音乐教育改革地深入发展,
胡锦涛总书记在全国科技大会上指出,要建设以企业为主体、市场为导向、产学研相结合的技术创新体系。这强调了技术创新必须主要依靠企业的资本投入并为企业赢得市场,同时也强
稻曲病是危害水稻的一种重要病害,农民形象地称它为“灰包”。近20年来,该病有逐年加重的趋势,受稻曲病危害,受害谷粒颖壳张开露出淡黄带青色块状物,以后逐渐膨大包裹整个谷