The molecular weight and molecular weight distribution of polyethylene were determined by GPC and Viscometry.

對GPC曲線的高斯函數(shù)擬合分峰禁止18岁以下看的黄片，計(jì)算在雙組分茂金屬催化體系中每種催化劑得到的聚乙烯的重量之比；根據(jù)各催化劑的催化活性和按所加的催化劑的摩爾比例假定進(jìn)行獨(dú)立反應(yīng)時在线观看免费麻豆AV，可以計(jì)算在雙組分催化體系中每種催化劑得到的聚乙烯的重量之比91精彩视频；根據(jù)兩種重量之比的比較結(jié)果和對雙組分茂金屬催化體系得到的聚乙烯的平均分子量和平均分子量分布的分析結(jié)果，可以推測在催化體系CatZr〓/CatZr〓中兩種催化劑基本上不存在相互作用激情综合婷婷丁香五月；而在CatZr〓／CatZr〓體系中兩種催化劑之間可能有相互作用存在人人干人人射人人。

The catalytic system composed of NHPI and transition metal ion can catalyze effectively ethane into acetic acid,cyclane into dicarboxylic acid,toluene into benzoic acid,alkene into epoxide,alkyne into acetylenic ketone,and amide into imide;NHPI used alone can catalyze adamantane to be carbonylated,hydrogen peroxide prepared by oxidization alcohol;NHPI combined with as...

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The structural and photocatalytic properties of TiO〓 as well as surface acidity were greatly improved by sulfation. SO〓〓/TiO〓 solid superacid with Hammett constant Ho less than -12.14 was prepared by treating the TiO〓 with 1.0mol. L〓 sulfuric acid solution and then calcining at 450℃ for 3h. When compared to unmodified TiO〓, the SO〓〓/TiO〓 superacid catalyst exhibited higher anatase content, smaller crystal size, higher specific surface area, centralized pore size distribution, and the blue-shifted band edge of uv-vis adsorption spectra. Furthermore, the SO〓〓/TiO〓 superacid also showed excellent reaction activity and stability for CH〓Br photocatalytic decomposition even under the moist reaction conditions. The apparent quantum efficiency of SO〓〓/TiO〓 was 10 times of that of TiO〓 catalyst for the photocatalytic degradation of bromomethane. Therefore, the SO〓〓/TiO〓 superacid catalyst is promising for practical application in environmental remediation.It was found that both L and B acid sites exist on SO〓〓/TiO〓 photocatalyst while only L acid sites on TiO〓 photocatalyst. On the basis of experimental results, the synergistic model of superacidic centers was proposed for SO〓〓/TiO〓 photocatalyst to explain the photocatalytic behavior and the mechanism of superacidifing effects, assuming that the adjacent L and B acid sites induced by SO〓〓 comprise cooperatively the superacidic center on superacid photocatalyst. The group cooperation of the superacidic center could strengthen the surface acidity, increase surface acid sites and the adsorbtion of O〓, promote separation of photogenerated electron-hole pair, enhance the interfacial transfer of charges and reversibility of water adsorption. Consequently the excellent photocatalytic activity, reaction stability and resistibility to humidity of SO〓〓/TiO〓 superacid photocatalyst may attributed to the group cooperated effect of the superacidic center on the photocatalyst.

研究結(jié)果表明：SO〓〓與TiO〓表面的結(jié)合為螯合式雙配位結(jié)構(gòu)；TiO〓光催化劑表面經(jīng)H〓SO〓浸漬處理后未满十八18禁止网站，提高了表面酸性凹凸在线导航AV网站，改善了催化劑結(jié)構(gòu)和光催化性能，當(dāng)H〓SO〓浸漬濃度為1.0mol.L〓全网免费看黄、燒結(jié)溫度為450℃時日韩操B，可制得SO〓〓/TiO〓超強(qiáng)酸催化劑(H〓＜-12.14)，其結(jié)構(gòu)和光催化活性得到明顯改善又大又粗又黄的视频大全，與TiO〓相比人人漂人人操，SO〓〓/TiO〓光催化劑的銳鈦礦含量高、晶粒小男人的天堂网最新网址、BET比表面積大又大又长的黄色视频、孔徑分布集中、光譜吸收邊藍(lán)移欧美、日韩、亚洲、中文视频，具有優(yōu)異的光催化氧化活性激情自拍三级文学视频激情、穩(wěn)定性及抗?jié)裥阅埽?strong>催化降解溴代甲烷的表觀量子效率比TiO〓催化劑提高了一個數(shù)量級国产精品一级AAAAAA片在线看，是一種有實(shí)際應(yīng)用前景的高效光催化劑黄片在线免费看免费看免费在线看；由此提出了SO〓〓/TiO〓超強(qiáng)酸催化劑表面集團(tuán)協(xié)同作用的超強(qiáng)酸中心模型，認(rèn)為在SO〓〓/TiO〓超強(qiáng)酸催化劑表面国产婷婷网站导航，由SO〓〓誘導(dǎo)的相鄰L酸中心和B酸中心組成了集團(tuán)協(xié)同作用的超強(qiáng)酸中心黄色网站av在线免费观看，其集團(tuán)協(xié)同作用顯著地增強(qiáng)了催化劑表面酸性欧美69av、增大了表面酸量及O〓吸附量、促進(jìn)了光生電子和空穴的分離及界面電荷轉(zhuǎn)移色综合综合热视频，具有可逆吸附水的性能99re国产在线，是SO〓〓/TiO〓超強(qiáng)酸催化劑具有優(yōu)異的光催化氧化活性、很好的活性穩(wěn)定性及抗?jié)裥阅艿闹匾颉?/p>

The apparent quantum efficiency of SO〓〓/TiO〓 was 10 times of that of TiO〓 catalyst for the photocatalytic degradation of bromomethane. Therefore, the SO〓〓/TiO〓 superacid catalyst is promising for practical application in environmental remediation.It was found that both L and B acid sites exist on SO〓〓/TiO〓 photocatalyst while only L acid sites on TiO〓 photocatalyst. On the basis of experimental results, the synergistic model of superacidic centers was proposed for SO〓〓/TiO〓 photocatalyst to explain the photocatalytic behavior and the mechanism of superacidifing effects, assuming that the adjacent L and B acid sites induced by SO〓〓 comprise cooperatively the superacidic center on superacid photocatalyst. The group cooperation of the superacidic center could strengthen the surface acidity, increase surface acid sites and the adsorbtion of O〓, promote separation of photogenerated electron-hole pair, enhance the interfacial transfer of charges and reversibility of water adsorption. Consequently the excellent photocatalytic activity, reaction stability and resistibility to humidity of SO〓〓/TiO〓 superacid photocatalyst may attributed to the group cooperated effect of the superacidic center on the photocatalyst.

研究結(jié)果表明：SO〓〓與TiO〓表面的結(jié)合為螯合式雙配位結(jié)構(gòu)；TiO〓光催化劑表面經(jīng)H〓SO〓浸漬處理后，提高了表面酸性激情亚洲欧美日韩在线观看网站，改善了催化劑結(jié)構(gòu)和光催化性能黄色免费的网视频，當(dāng)H〓SO〓浸漬濃度為1.0mol.L〓、燒結(jié)溫度為450℃時农村丰满饥渴老女人性视频，可制得SO〓〓/TiO〓超強(qiáng)酸催化劑(H〓＜-12.14)，其結(jié)構(gòu)和光催化活性得到明顯改善，與TiO〓相比九九性爱，SO〓〓/TiO〓光催化劑的銳鈦礦含量高、晶粒小欧美一级黄色A片、BET比表面積大欧美日韩区国产区、孔徑分布集中、光譜吸收邊藍(lán)移中文字幕第二一区，具有優(yōu)異的光催化氧化活性人人干人人操人人舔人人摸、穩(wěn)定性及抗?jié)裥阅埽?strong>催化降解溴代甲烷的表觀量子效率比TiO〓催化劑提高了一個數(shù)量級91POPNY丨国产熟女，是一種有實(shí)際應(yīng)用前景的高效光催化劑国内美女精品人AV在线播放；由此提出了SO〓〓/TiO〓超強(qiáng)酸催化劑表面集團(tuán)協(xié)同作用的超強(qiáng)酸中心模型，認(rèn)為在SO〓〓/TiO〓超強(qiáng)酸催化劑表面日韩揉揉人人澡澡人人，由SO〓〓誘導(dǎo)的相鄰L酸中心和B酸中心組成了集團(tuán)協(xié)同作用的超強(qiáng)酸中心99精品视频在线看，其集團(tuán)協(xié)同作用顯著地增強(qiáng)了催化劑表面酸性、增大了表面酸量及O〓吸附量欧美一区二区一页、促進(jìn)了光生電子和空穴的分離及界面電荷轉(zhuǎn)移黑人欧美视频，具有可逆吸附水的性能，是SO〓〓/TiO〓超強(qiáng)酸催化劑具有優(yōu)異的光催化氧化活性欧美色日韩、很好的活性穩(wěn)定性及抗?jié)裥阅艿闹匾颉?/p>

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用過渡金屬交換的分子篩作為催化劑韩国Ⅴ欧洲V日本VA片在线观看，進(jìn)行催化熱裂解制取乙烯的反應(yīng)，研究發(fā)現(xiàn)色色香蕉色色色，在β沸石分子篩和ZSM-5分子篩中引入過渡金屬后毛片a视频，催化熱裂解反應(yīng)的產(chǎn)物分布與相應(yīng)的氫型分子篩相比有了較大的變化，說明過渡金屬的加入對于催化熱裂解反應(yīng)的機(jī)理具有影響欧美色爱区，Ⅷ族金屬如Fe国产免费污网站在线观看、Co、Ni和第Ⅰ、Ⅱ副族Cu精品射射射福利一区、Zn表現(xiàn)出較強(qiáng)的氧化脫氫活性不卡av在线免费观看，產(chǎn)物中氫氣、焦炭的產(chǎn)率很高亚洲国产一区二区三区青草影视，Ti欧美激情偷乱人伦小说专区、Cr則未表現(xiàn)出氧化作用：分子篩及催化劑中引入銀后，催化熱裂解反應(yīng)的轉(zhuǎn)化率和乙烯的產(chǎn)率有了提高鸥美色精品在线播放，丙烯產(chǎn)率沒有很大的變化又污又黄又爽的网站，說明銀在催化熱裂解反應(yīng)中能夠促進(jìn)正碳離子的生成，又有可能通過氧化-還原作用部分改變反應(yīng)機(jī)理成年人在线观看，促進(jìn)了自由基的生成人人妻人人干，并且由于銀對烯烴的吸附很弱，其氫轉(zhuǎn)移反應(yīng)和脫氫在线免费免费观观看看的黄色视频、加氫活性比較低人人插人人透人人射人人色人人干，有利于烯烴產(chǎn)率的提高。

The results showed that, with the increase of reaction temperature, the catalytic deacidifcation and non-catalytic deacidification ability of MgO were basically decreased at lower space velocity and gradually increased at higher space velocity.

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In this paper,we compared the photodegradation efficiency of nano-titania films by using dichloroacetic acid,rhodamine B and methyl orange as the photocatalytic referents and the ultraviolet lamp as the source light to generate the photocatalytic reaction.

針對納米氧化鈦光催化性能研究中缺乏統(tǒng)一有效表征標(biāo)準(zhǔn)的現(xiàn)狀免费观看黄色网站一区二区，比較了二氯乙酸美国一级做受、羅丹明B和甲基橙三種光催化活性評價(jià)物的熱穩(wěn)定性和對紫外光的穩(wěn)定性，并以氧化鈦納米薄膜為光催化劑视色视色视频在线观看，研究了三種評價(jià)物的光催化降解效率表征，以及酸堿度jizz女、通氧條件等因素對評價(jià)物在光催化活性表征中的影響及其機(jī)理国模吧首页，歸納了三種評價(jià)物對于納米氧化鈦光催化活性表征的優(yōu)缺點(diǎn)。

In the absence of organic solvent and phase-transfer reagent, the catalytic oxidation of cyclo- hexene to adipic acid with aqueous 30% hydrogen peroxide can be achieved in the presence of tungstic acid/acidic organic additive.

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In this paper, the characteristics of catalytic reforming reaction, coke deposition on Ni katalyst and three-dimension flow in the micro combustor premixed chamber were simulated.

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While in photoreduction of Cr , the titania-modified MCM-41 photocatalysts were more photoactive than the titania-silica composite (25％ TiO〓).

在光催化降解苯酚中氧化鈦修飾MCM-41的光催化活性雖然不及結(jié)晶的銳鈦礦相納米氧化鈦538国产在线视频，但是仍具有較高的催化活性97超碰免费；在光催化還原Cr到Cr反應(yīng)中氧化鈦修飾MCM-41的光催化還原性明顯高于部分結(jié)晶的TiO〓-SiO〓（25wt％TiO〓）復(fù)合氧化物。