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中性催化
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  neutral reaction
     Compared with the cationic reaction mechanism,the neutral reaction mechanism is easier to initialize.
     中性催化机理较阳离子催化机理容易引发 .
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  “中性催化”译为未确定词的双语例句
     It is also found thatthe activity of the catalyst in a neutral medium approaches that of the cataly-st in an acidic medium by adding to the former diethanolamine or pyridine aspromoter.
     在中性催化液中加入助催化剂二乙醇胺或吡啶,其催化活性接近酸性介质。
短句来源
     It is acidic and neutral catalysis when pH<~7.4 with long period (half-life>1000d) and only one product (pentachlorocyclohexene) is determined in test; and it is a zero-order-rate reaction not related with acidity.
     以pH值~7.4为界分为两部分,pH值<~7.4为酸性和中性催化,反应周期长(半衰期>1000d),检测到的产物少(只有五氯环己烯),是与酸度无关的零级反应;
短句来源
  相似匹配句对
     Neutral doctrism
     中性主义
短句来源
     Determination of Trace Vanadium Using Neutral Red by Catalytic Fluorimetry
     中性催化荧光法测定钒(Ⅴ)
短句来源
     catalyst A340;
     催化催化 ;
短句来源
     Neuter Times
     中性时代
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     CATALYTIC TITRATION
     催化滴定
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  neutral reaction
Atomic substitution involving deuterium atoms has a lower activation energy of a thermally neutral reaction than radical abstraction or substitution.
      
The activation energy of the thermally neutral reaction (Ee,0) is calculated for each class of reactions.
      
The activation energy of the thermally neutral reaction (Ee,0) is calculated for each class of reactions.
      
The classical potential barrier of the thermally neutral reaction of alkyl radical addition to benzoquinone is Ee,0 = 82.1 kJ/mol.
      
These complexes result from a thermally neutral reaction and turn into products after overcoming a low energy barrier.
      
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Copper,zinc and copper-zinc(1:1)polyphthalocyanine sulfonates are selectedfrom various metal salts of poly-phthalocyanine sulfonates as non-mercury cata-lysts of comparatively high activity for acetylene hydration.It is also found thatthe activity of the catalyst in a neutral medium approaches that of the cataly-st in an acidic medium by adding to the former diethanolamine or pyridine aspromoter.An acetaldehyde yield of 21.4% and a selectivity of 100% can be ob-tained under the conditions given in this paper....

Copper,zinc and copper-zinc(1:1)polyphthalocyanine sulfonates are selectedfrom various metal salts of poly-phthalocyanine sulfonates as non-mercury cata-lysts of comparatively high activity for acetylene hydration.It is also found thatthe activity of the catalyst in a neutral medium approaches that of the cataly-st in an acidic medium by adding to the former diethanolamine or pyridine aspromoter.An acetaldehyde yield of 21.4% and a selectivity of 100% can be ob-tained under the conditions given in this paper.

通过对各种金属的聚酞菁磺酸盐乙炔液相水合催化活性的比较,反应介质,温度对催化活性的影响及助催化剂的选择等研究,筛选出聚酞菁铜磺酸盐、聚酞菁锌磺酸盐和聚酞菁铜锌(1:1)磺酸盐为乙炔液相水合催化活性较高的非汞催化剂。在中性催化液中加入助催化剂二乙醇胺或吡啶,其催化活性接近酸性介质。在本文选择的工艺条件下乙醛收率达21.4%,选择性为100%。

Ampoule-shaker research system was employed to test the influence of acidity on lindane hydrolysis for better understanding its environmental behavior under the condition of different acidity. The results show that acidity is an important influence factor for the transformation rate of lindane, and divided into two parts with pH value ~7.4 as boundary. It is acidic and neutral catalysis when pH<~7.4 with long period (half-life>1000d) and only one product (pentachlorocyclohexene) is determined in test; and it...

Ampoule-shaker research system was employed to test the influence of acidity on lindane hydrolysis for better understanding its environmental behavior under the condition of different acidity. The results show that acidity is an important influence factor for the transformation rate of lindane, and divided into two parts with pH value ~7.4 as boundary. It is acidic and neutral catalysis when pH<~7.4 with long period (half-life>1000d) and only one product (pentachlorocyclohexene) is determined in test; and it is a zero-order-rate reaction not related with acidity. When pH>~7.4, it is a basic catalysis, the hydrolysis rate constant increases with rising of pH from 0.0057d-1 at pH 8.3 to 46.58d-1 at pH 12.02, and it is first-order-rate grade reaction of OH-; under basic condition the distribution of product is related with acidity. 1,2,4-trichlorobenzenne(TCB) and 1,2,3-TCB are the products of second-order-rate reaction between OH- and the medium product pentachlorocyclohexene. The formation of 1,3,5-TCB is influenced the most by pH value, and it is a minor product (1%) at pH 8.30 while a dominant one (18%) of hydrolysis at pH 12.02.

为了更好地理解林丹的环境行为,采用安瓿瓶-震荡器研究水体系,对不同酸度条件下林丹水解反应进行实验.结果表明,酸度是影响林丹转化速率的重要因素.以pH值~7.4为界分为两部分,pH值<~7.4为酸性和中性催化,反应周期长(半衰期>1000d),检测到的产物少(只有五氯环己烯),是与酸度无关的零级反应;pH值>~7.4为碱性催化,随着pH值的升高,水解速率从pH8.30的0.0057d-1增加到pH12.02的46.58d-1, 是OH-的一级反应.在碱性条件下,产物的分布也与酸度相关,1,2,4-三氯苯和1,2,3-三氯苯是中间产物五氯环己烯和OH-的二级反应产物, 1,3,5-三氯苯的形成受pH值影响最大,从pH8.30的次要产物(1%)成为pH12.02的主要水解产物之一(18%).

When bulk Ni(Ⅱ)salicyladimine complexes react as a single component polyethylene catalysts, they may react via neutral reaction mechanism. Computational study was carried out for the neutral mechanism at B3LYP/LANL2MB level. The results show that the neutral mechanism is similar to a catalytic cation mechanism. The neutral mechanism starts from a neutral complex of square-planar structure with a vacant site. An ethylene molecule then attacks the vacant site perpendicular to the equatorial MeNi(NC-CO)] plane...

When bulk Ni(Ⅱ)salicyladimine complexes react as a single component polyethylene catalysts, they may react via neutral reaction mechanism. Computational study was carried out for the neutral mechanism at B3LYP/LANL2MB level. The results show that the neutral mechanism is similar to a catalytic cation mechanism. The neutral mechanism starts from a neutral complex of square-planar structure with a vacant site. An ethylene molecule then attacks the vacant site perpendicular to the equatorial MeNi(NC-CO)] plane and then rotates into the plane as a transition state for insertion reaction. After insertion reaction, a β-agostic hydrogen agostic bond is formed between Ni and β-C so as to assist the regeneracy of a new vacant site and to realize chain propagation. For chain propagation, another ethylene replaces the hydrogen atom in the hydrogen agostic bond. The calculations show that agostic bonds play an important role in activating the reactant in a catalytic process. But there are some differences in the neutral mechanism as compared with the cationic mechanism. The initial square planar complex with the vacant site of the neutral reaction mechanism possesses lower energy so that it needs no cocatalyst; In contrast with cationic mechanism, there is no equilibrium geometry of ethylene in co-plane with the plane of the catalyst for the neutral mechanism because of lower positive charge on the nickel atom in the catalyst. In the neutral mechanism, the ethylene molecule and the catalyst are not coordinated in co-plane with each other as an intermediate, but as a transition state and a saddle point of second order before the insertion reaction.

 Ni(Ⅱ)与含氮氧配位原子的大配体形成的催化剂,可以不用助催化剂即有较高的烯烃聚合催化活性.不用助催化剂的催化机理不是阳离子催化反应机理,而是电中性催化机理.应用密度泛函理论方法,在B3LYP/LANL2MB水平上,研究了Ni(Ⅱ)催化剂催化乙烯聚合的电中性反应机理.计算结果表明,电中性催化机理类似于阳离子催化机理.电中性催化机理中,初始带空位的中性四面体络合物能量较低,是避免使用助催化剂的必要条件;由于Ni原子带正电荷较小,乙烯与催化剂共平面的的结构不是平衡几何构型,而是过渡态.在B3LYP/LANL2MB在水平上优化得到一个乙烯与催化剂共平面的二级鞍点结构.

 
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