By analyzing the differences between acidic and basic catalytic action in this transesterificatios, it is considered that the main cause of yielding an anisole by-product is due to the basic catalysis, a Lewis acidic catalyst is helpful for the selective DPC formation.

通過(guò)分析酸堿催化作用在酯交換反應(yīng)中的差異，認(rèn)為堿催化是副產(chǎn)物苯甲醚生成的主要原因欧美乱伦视频网站，Lewis酸性的催化劑有利于碳酸二苯酯的高選擇性国产福利在线观看。

In the acylation reaction between anisole with acetyl chloride, The catalyst of ZnCl〓/HY-98 prepared by MWI had the best catalytic activity and the selectivity of p-methoxy acetopheone. The catalytic active centers were ZnCl〓 dispersed in zeolite and the Bronsted acid sites in HY-98 zeolite itself.

在苯甲醚與乙酰氯的酰化反應(yīng)中视频高清在线看日韩精品免费，微波固相法制備的ZnCl〓／Y催化劑有相對(duì)較好的催化活性和選擇性国产亚洲日韩精品超碰，起催化作用的主要是分散在分子篩表面的ZnCl〓和分子篩本身的B酸。

The method is based on the catalytic effect of trace formaldehyde on the reaction between potassium bromate and Azur A .

研究了在H2SO4介質(zhì)中欧美性爱网站地址，微量甲醛對(duì)KBrO3氧化天青A 有較強(qiáng)的催化作用午夜a一级毛片视频网站在线免费观看，建立了催化光度法測(cè)定微量甲醛的新方法。

Based on the catalytic effects of trace formaldehyde on the reaction between potassium bromate and oxidized azur A,a new catalytic spectrophotometric method has been developed in this paper.

基于在一定溫度和硫酸介質(zhì)中欧美偷拍视频xxxx，痕量甲醛對(duì)溴酸鉀氧化天青A 有較強(qiáng)的催化作用老熟妇伦乱一区二区，建立了測(cè)定痕量甲醛的新的催化光度法。

With regard to potential catalysis mechanism it is of interest to further investigate the structural basis of phosphorylated protein.

由于磷酸化蛋白質(zhì)在生物體內(nèi)具有重要的催化作用人人摸时时操天天爽人人插，因此研究其催化的結(jié)構(gòu)基礎(chǔ)非常重要免费av黄色录像免费的黄色录像。

The catalysis of FeS〓 to chalcopyrite was remarkable and a theory of "electrochemical catalysis"was proposed.

基于FeS〓對(duì)黃銅礦細(xì)菌浸出的顯著催化效果，提出了FeS〓對(duì)黃銅礦細(xì)菌浸出具有"電化學(xué)催化作用"的見(jiàn)解一级黃色视频一区二区三区。

The results of further experiments show that most of the metallic oxides give a catalytic effect on NO/CO reaction, while pre-reduced Ni2O3 sample shows remarkable catalytic activity to the direct decomposition of NO.

大部分金屬氧化物以對(duì)NO/CO反應(yīng)的催化作用為主自拍偷拍亚洲精品，而Ni2O3的預(yù)還原試樣對(duì)NO的直接分解反應(yīng)表現(xiàn)了極強(qiáng)的催化活性。

In ChapterⅤ, the asymmetric reduction of prochiral ketones using borane as the reagent catalyzed by chiral dysprosium catalyst were described.

第五章主要研究了手性鏑試劑催化下硼烷對(duì)潛手性酮的不對(duì)稱(chēng)還原反應(yīng)黄色视频在线观看aaaa级，結(jié)果表明異丙氧基鏑對(duì)硼烷還原酮有明顯的催化作用国产日韩欧美主播。

It can be used in wastewater treatment including papermaking, leather making, coking, printing and dyeing, heavy metals, pesticide and oil pollution with principles of absorption, flocculus and photocatalysis.

空心微珠在水處理方面的研究涉及造紙廢水、制革廢水欧美黄色一级久久片、焦化廢水99久久播放视频、印染廢水、重金屬?gòu)U水亚洲欧洲性爱、農(nóng)藥廢水99色免费看视频、石油污染等，其作用原理包括吸附作用爽到高潮嗷嗷嗷叫视频软件，絮凝作用不卡性爱视频，光催化作用三大方面。

The results show that there is a synergism for methanol oxidation on the electrode.

研究結(jié)果表明国产专区双飞，此種電極對(duì)甲醇氧化具有很好的電催化活性欧美精品午夜一级，并有協(xié)同催化作用99reav.。