Being combining with products distribution in styrene oxidation, we propose the styrene epoxidation carry out with Ti metallacyclo intermediates, And at the same time Ti-ZSM-5 have properties both catalytic epoxidation and acid-catalysis, namely the skeletal Ti can catalyze styrene epoxidation to styrene oxide and the skeletal Ti and Al can provide Lewis acid site to cause the rearrangement of styrene oxide to phenylacetaldehyde rapidly, the solvolysis to glycols and the cleavage of C=C double bond. Ti-ZSM-5 can also provide Bronsted acid site simultaneously, which is also catalytic center for the solvolysis to glycols.

同時結(jié)合Ti-ZSM-5催化選擇性氧化苯乙烯反應(yīng)的產(chǎn)物分布結(jié)果黄色视频你们懂的，提出苯乙烯環(huán)氧化反應(yīng)可能是通過金屬有機(jī)環(huán)機(jī)理進(jìn)行；Ti-ZSM-5同時具有催化環(huán)氧化和酸催化兩種功能在线视频国产欧美，其骨架鈦可催化苯乙烯環(huán)氧化生成環(huán)氧苯乙烷不卡av在线免费观看，而骨架鈦和骨架鋁等可提供Lewis酸位使環(huán)氧苯乙烷迅速發(fā)生重排生成苯乙醛從而使其成為反應(yīng)的主要產(chǎn)物，同時還可發(fā)生加成以及碳碳鍵的裂解等副反應(yīng)：Ti-ZSM-5也提供Bronsted酸位欧美爱爱一区二区视频，它也是生成加成產(chǎn)物的活性中心欧美一级片在线。

To be different from the already chloromethylation catalyst, it has a certain amount of moisture wet, which will not produce huge amounts of doughtic cancerogenic chloromethyl methyl ether during and after the reaction.4,4\'-bisbiphenyl, 1,4-bisbenzene, 1,4-bis(chloro- methyl)-2,5-dimethylbenzene, 1,5-bis-2,4-dimethylbenzene, 4-(chlor- omethyl)-1,2-dimethylbenzene, 1,2-bis-4,5-dimethylbenzene, 5,8-bis-1,2,3,4-tetrahydronaphthalene, 3,3\',5-tris-4,4\'-bisbiphenyl and 3,3\', 5,5\'-tetrakis-4,4\'-bisbiphenyl were synth- esized by using this new catalyst. Results indicated that when the reaction temperature was 55～60℃, the reaction time was 12h, the catalyst which consists of the concentration of 80%H_2SO_4, HAc and Lewis acid, the amount of Lewis acid 0.15 mol(nLewis:nbiphenyl=1.5:1), yield of biphenyl chloromethylation product 4,4\'-bis(chrolomethylbiphenyl can reach a maximum 85%.

采用這種催化體系完成了4，4′-二氯甲基聯(lián)苯91自拍老女人在线看、對二氯甲基苯多人群p刺激交换视频日本、1，4-二氯甲基-2免费在线观看黄色网站大全www，5-二甲基苯有色视频在线观看、1，5-二氯甲基-2欧美黄片一级艹逼，4-二甲基苯国产按摩会所在线观看、4-氯甲基-1，2-二甲基苯欧州三级网址、1少妇99，2-二氯甲基-4，5-二甲基苯自偷自拍你懂的、5A片在线观看网址免费不卡国产片，8-二氯甲基-四氫萘国产操B在线、3，3'男人免费天堂，5-三氯甲基-4永久域名地址18，4'-二甲基苯和3，3'日女人黄色网站免费看，5国产中文在线精品一区，5'-四氯甲基-4，4'-二甲基苯的合成免费人欧美成又黄又爽的视频，結(jié)果表明：在反應(yīng)條件為：反應(yīng)溫度55～60℃国产精品亚洲一区二区网址，反應(yīng)時間12h，選擇80%H_2SO_4三级国产三级精品网站、冰醋酸和Lewis酸為催化劑91成年人在线观看，反應(yīng)最佳反應(yīng)Lewis酸用量是0.15mol(和原料比為1.5：1)，反應(yīng)效果最好国产看视频，聯(lián)苯氯甲基化產(chǎn)物(4超碰人妻中文字幕，4′-二氯甲基聯(lián)苯)收率為85%；在反應(yīng)條件為：反應(yīng)溫度70℃亚洲另类欧美在线综合，反應(yīng)時間8h亚洲三级免费视频，80%H_2SO_4、冰醋酸和Lewis酸為催化劑免费A级毛片无码的，反應(yīng)最佳反應(yīng)Lewis酸用量是0.1mol(和原料比為1：1)時A毛毛片，反應(yīng)效果最好，苯的氯甲基化產(chǎn)物收(來源：ABd0C論文eded網(wǎng)www.abclunwen.com)率為75%中文字幕久久精品无码综合网泰国；在反應(yīng)條件為：在反應(yīng)條件為：反應(yīng)溫度40℃色欲色欲天天免费视频，反應(yīng)時間10h，60%H_2SO_4和Lewis酸為催化劑色无码免费视频一区二区，反應(yīng)最佳反應(yīng)Lewis酸用量是0.1mol(和原料比為1：1)時，反應(yīng)效果最好91cm182在线播放，對二甲苯氯甲基化產(chǎn)物(1日韩激情福利小说视频在线观看免费，4-二氯甲基-2，5-二甲基苯)收率為78.5%欧美视频网在线免费观看；在反應(yīng)條件為：反應(yīng)溫度35℃国产亚洲日本在线观看，反應(yīng)時間10h，60%H_2SO_4国产一级无码中文字幕、冰醋酸和Lewis酸為催化劑哪里可以看免费的黄色网站，反應(yīng)最佳反應(yīng)Lewis酸用量是0.1mol(和原料比為1：1)時，反應(yīng)效果最好美女黄应用，間二甲苯氯甲基化產(chǎn)物(1H纯肉无遮挡3d动漫在线，5-二氯甲基-2国产h片免费，4-二甲基苯)收率為81.5%。

Rate enhancement in ligand-free palladium catalyzed Suzuki reaction by Lewis acid promoters;2. Metoprolol was synthesized with isopropylamine and 4-(2-methoxyethyl)phenyl glycidyl by different Lewis acid .

Lewis酸催化對甲氧乙基苯基縮水甘油醚與異丙胺的反應(yīng)得到美托洛爾国产91精品熟女自拍，考察不同的催化劑日韩精品一区二区AV免费、反應(yīng)溫度、反應(yīng)時間對反應(yīng)的影響免费xxxx视频。

When using urea-hydroperoxide as oxygent, just the trimethylphosphine adsorbed on the Lewis acid sites in TS-1 zeolite was oxidized. It further confirmed that the hydroperoxo-titanium species formed by the interaction between the titanium in Lewis acid sites and urea-hydroperoxide are the active oxidation center, and the titanium in the framework as Lewis acid sites enhances the oxidation ability of hydroperoxide. 3. Phenylacetaldehyde and benzaldehyde are found to be the major products in the catalytic oxidation of styrene over TS-1 zeolite, and styrene epoxide is not as speculated detected.

當(dāng)以過氧化氫尿素為氧化劑時人人操人人在线，室溫條件下吸附在TS-1分子篩Lewis酸性位的三甲基膦即能被氧化，由此進(jìn)一步證明欧美欲望视频，TS-1分子篩中由Lewis酸性位的骨架鈦與過氧化氫相互作用形成的過氧化鈦物種是三甲基膦氧化反應(yīng)的活性中心a毛片免费全部播放完整网站，骨架鈦作為Lewis酸中心提高了過氧化氫的氧化能力。

Different from the Lewis acidity nature of SO4(superscript 2-)/ZrO2/MCM-41, SO4(superscript 2-)/TiO2 and S2O8(superscript 2-)/TiO2 behave mainly Brnsted acidities. The strongest Brnsted acid sites are formed on SO4(superscript 2-)/TiO2 promoted with H2SO4, while Lewis acid sites on S2O8(superscript 2-)/TiO2 are even stronger than those on SO4(superscript 2-)/ZrO2/MCM-41, and the former which are generated when persulfate solution is used as sulfating agent.

與SO4(上標(biāo) 2-)/ZrO2/MCM-41主要表現(xiàn)為Lewis酸性不同A级毛片就高清免费视频，SO4(上標(biāo) 2-)/TiO2和S2O8(上標(biāo) 2-)/TiO2主要以Brnsted酸性為主偷窥盗摄国产在线视频，其中采用硫酸為促進(jìn)劑制備的SO4(上標(biāo) 2-)/TiO2具有最強(qiáng)的Brnsted酸性，而采用過硫酸根作為促進(jìn)劑則使S2O8(上標(biāo) 2-)/TiO2產(chǎn)生較SO4(上標(biāo) 2-)/ZrO2/MCM-41更強(qiáng)的Lewis酸中心狂野殴美激情性XXXX。

We postulate that this is a Lewis base activating Lewis acid reaction.

我們仔細(xì)研究了Lewis堿的變化對反應(yīng)的影響亚洲黄色网站免费观看，并根據(jù)實驗結(jié)果提出了Lewis堿活化Lewis酸的反應(yīng)機(jī)理。

Because substituted anilines have Lewis acid or Lewis base group, extractions with complexing agent was conducted.

由于取代苯胺都具有Lewis酸性或Lewis堿性官能團(tuán)男女性爱黄色视频是免费，采用相應(yīng)的絡(luò)合劑進(jìn)行了絡(luò)合萃取的研究美女色色视频。

It was found that Lewis acid-metal is a preferable catalyst system for the polymeri- zation of aromatic nitriles, and the polymerization rate is as about 10 times fast as Lewis acid alone.

結(jié)果表明以含質(zhì)子化合物或水與Lewis酸組成的體系并不是有效的催化體系，不適用于催化芳香族腈進(jìn)行聚合国产亚洲日韩欧美高清在线MV。

The acidity of Lewis acid sites and the basicity of Lewis base sites influence the intensity between water, 1,2-dichloropropane and catalyst. The specific area of catalyst influences the capacity of adsorption.

催化劑Lewis酸位和Lewis堿位的酸堿強(qiáng)度直接影響水久久婷婷国产综合日韩欧美、1，2－二氯丙烷與催化劑的作用強(qiáng)度国产AV国片精品一区二区，而催化劑的表面積直接影響吸附量不卡黄色视频在线观看。

In addition, in-situ infrared spectroscopy provides the information about the nature of the surface acid and base sites. For example, Lewis acid and base sites on metal oxides are coordinatively unsaturated metal cations and oxygen anions, respectively, while Brinsted acid and base sites are the hydroxyl groups on the surface.

結(jié)合原位紅外光譜，還能夠詳細(xì)地了解表面酸堿中心的性質(zhì)：金屬氧化物表面的Lewis酸中心和堿中心分別是表面配位不飽和的金屬離子和氧負(fù)離子爱爱免费网站欧美， Brinsted酸中心和堿中心則是金屬氧化物表面的羥基国产精品sss在线观看AV。