酸中心

在氟含量较高时，生成了新的更强的B酸中心，且使得L酸酸性增强。

While higher fluorine content leads to the formation of stronger Brnsted acid site and Lewis acidity is also strengthened .

结合实验数据与文献报道，我们认为，吸附在Br（？）nsted酸中心上的苯易与来自金属活性中心的溢流氢作用生成环己烷，从而导致环己烯得率较低。

By combining the experimental results and literature reports , benzene adsorbed on the Br (?) nsted acid site is more favorable for the formation of cyclohexane with the spill-over hydrogen from the metal active site , resulting in lower yield of cyclohexene .

实验结果还表明氨分子在B酸中心上优先被吸附。

The experimental results show that ammonia molecule is adsorbed preferentially on the B acid sites .

锂对于γ-Al2O3表面酸中心的调变作用及其积炭性能的影响

Effect of lithium on the acidic property of r-ai_2o_3 and its carbon deposition

酸中心在FCC催化剂上的形成机制

Study on formation mechanism of Acid Sites in FCC catalyst

分子筛酸中心与NMR

Acidic center of zeolite and NMR

苯酚与MTBE烷基化反应主要在中等强度和弱的B酸中心上进行。

The alkylation of phenol with MTBE was mainly proceeded on the middle-strength or weak B acid center .

沸石经La、Mn、Co离子交换和水蒸气处理改性，可以改变其酸性：交换La降低Hβ总酸中心量，主要是强酸中心量减少和强度减弱；

It is found that Mn and La ion modification could decrease the total amount of acid sites and weaken the acid strength .

结果表明，磷改性使催化剂的B酸中心数量增加了0.02mmol.g-1，而B酸中心的增加有利于双分子的氢转移反应，避免反应过程中催化剂表面的积炭。

The results showed that B acid of the catalyst modified by phosphorus was enhanced by 0.02 mmol · g-1 , which favored the hydrogen transfer reaction and inhibited coke formation .

发现所用γ-Al2O3表面酸中心主要为Lewis酸中心；

It is found that almost all of the acid sites on the surface of γ - Al2O3 are Lewis type .

2，6&二甲基吡啶在Y型分子筛的Bronsted和Lewis酸中心上的吸附动力学

Studies on the adsorption kinetics of 2,6-lutidine on Bronsted and Lewis acid sites of Y zeolite

TAPO－5异构化的选择性大小与B酸中心的强度有关。

The isomerization selectivity of xylene over TAPO 5 is related to the intensity of Bronsted acid center .

Ce（Ⅳ）Y吸附剂的强B酸中心均引起噻吩和环己烯吸附方式的变化，生成相应的质子化产物，对甲苯的吸附方式无影响。

The strong Bronsted acid sites of Ce ( IV ) Y lead to the protonation of thiophene and CHE , but have no effect on the adsorption mode of toluene .

结果表明：Mo物种迁移进入分子筛孔道的能力决定于分子筛B酸中心的数目大小。

From the results it is concluded that the migration ability of Mo species into the zeolite channels strongly depends on the number of the Bronsted acid sites per unit cell .

实验结果表明：γ&Al2O3经TiF4处理后，表面产生了B酸中心；

It has been showed that there are B acid sites on the surface of catalyst after γ - Al_2O_3 was treated with TiF_4 ;

通过对相关的分子筛进行表征，结果表明，影响酰化反应活性的主要因素是B酸中心的酸强度，而稳定性与B酸中心在分子筛表面上的分布有关。

The corresponding zeolites were characterized . The results showed that the main factor affecting the activity was the strength of Br ? nsted acid sites and the stability was related to the distribution of the Br ?

同时证实了Silicalite-1中不能形成Bronsted酸中心；

Meanwhile , silicalite-1 was confirmed to have no Bronsted acidic protons .

观察到甲醇转化的产物分布与催化剂表面结构OH基（3608cm~（-1））附近的吸收峰强度，B酸中心的数目及其强度有直接关联。

It was observed that the product distribu-tion in methanol conversion is directly related to the intensity of OH ad-sorption at 3608cm ~ ( - 1 ), the amount of B acid sites and their strength .

试验表明同一系列合成丝光沸石制备和交换过程中，总SiO2/Al2O3和钠被交换率与酸中心数有一定关系。

Of acid sites and total SiO_2 / Al_2O_3 or sodium ion exchanged during the preparation and ion exchanging process for the same series of synthetic mordenites .

而铜、锌改性则进一步减少了催化剂表面的B酸中心同时增加了L酸中心。

While impregnation with the oxides of copper or zinc can further decrease the amount of Bronsted acid sites , meanwhile increase the amount of Lewis acid sites .

红外光谱测试结果表明，催化剂表面主要存在L酸中心。

IR pattern indicated that Lewis acid centers mainly exist on the catalyst surface .

CuO粒子分散度好和较少量酸中心的担载氧化铜催化剂有利于2,4-二氯酚的氧化降解。

Supported CuO catalysts with good dispersion of CuO particles and fewer amounts of acid sites took advantage of the oxidative degradation of 2 , 4-DCP .

经γ-GOPS表面功能化，键合的γ-Al2O3在高温焙烧后可以在表面形成酸性很强的Lewis酸中心，并使γ-Al2O3的表面总酸量增加。

After the Y - Al2O3 was modified and burned at high temperature , it formed very strong Lewis acid centers on its surface and the total amount of acid was increased .

原位1HMASNMR测定还表明，被Mo物种取代的B酸中心在反应诱导期内并不能再生。

The in situ 1H MAS NMR experiments also demonstrate that the Bronsted aicd sites , once replaced and occupied by Mo species , can not regenerate during the induction period of the reaction .

结果表明，硼的引入增加了Y分子筛的B酸中心数目以及裂化和氢转移反应活性，导致裂化汽油中的烯烃明显降低，芳烃随之增加。

The catalytic activity of zeolite BY for cracking and hydrogen transfer reaction was enhanced , the olefin in the cracking gasoline was decreased and the aromatic hydrocarbons were increased . Thus BY zeolite is an ideal active component for the olefin-reducing FCC catalyst .

其超强酸中心属于L酸中心，是主要的催化活性中心；

The superacid sites were attributed to Lewis acid sites and proved to be dominant active center .

实验发现，β分子筛对甲基叔丁基醚（MTBE）反应的催化活性是各类酸中心共同作用的结果，但强Lewis酸密度对其活性的影响较大；

It was found that all kinds of acid contributed to the catalytic activity of zeolite beta for MTBE , and the strong Lewis acid density had larger influence .

结果表明：催化剂表面存在明显的Bronsted酸中心，对缩酮化反应的催化活性好，且催化活性随灼烧温度的升高而降低。

The results showed that the catalysts had Bronsted acid centers and the catalytic activity decreased with the rising of calcination temperature .

Al2O3-TiO2复合载体表面具有较低的酸性，且只有L酸中心；

Al_2O_3-TiO_2 complex support had low surface acidity and contained only Lewis acid sites .

TS-1中含有的微量酸中心能够导致环氧丙烷与溶剂反应生成丙二醇、1-甲氧基-2-丙醇和2-甲氧基-1-丙醇；

The minimum acidity in TS 1 can catalyze the solvolysis reaction of PO to propylene glycol , 1 methoxy 2 propanol and 2 methoxy 1 propanol .