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首页> 外文期刊>Catalysis science & technology >A facile approach to enhancing activity of Ni2P/SiO2 catalyst for hydrodechlorination of chlorobenzene: promoting effect of water and oxygen
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A facile approach to enhancing activity of Ni2P/SiO2 catalyst for hydrodechlorination of chlorobenzene: promoting effect of water and oxygen

机译：一种增强Ni2p/SiO2催化剂活性用于氯苯氢化氯的活性的方法：水和氧气的促进作用

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摘要

An effective approach to enhancing the activity of the Ni2P/SiO2 catalyst for the hydrodechlorination of chlorobenzene (CB) was reported. At atmospheric pressure, 513 K, a CB WHSV of 4.1 h(-1) and a H-2/CB molar ratio of 9.0, Ni2P/SiO2 gave a chlorobenzene conversion of 5.6%. Surprisingly, after Ni2P/SiO2 was pretreated with a 0.8-3.0% H2O/H-2 flow below 543 K, the conversion reached as high as 99%. As the pretreatment temperature increased, the conversion tended to decrease; however, a conversion of 42.6% was still obtained even at the pretreatment temperature of 673 K. The activity of Ni2P/SiO2 was also improved when 0.8% H2O or 0.5% O-2 was introduced into the reaction system. In addition, the passivation of Ni2P/SiO2 followed by the reduction led to a conversion of 33%. The Ni2P/SiO2 catalysts before and after the pretreatment were characterized by N-2-sorption, XRD, ICP-AES, XPS, in situ DRIFT, and H-2- and NH3-TPD. The results show that the pretreatment did not obviously influence specific surface area, pore structure, Ni2P crystallite size, the electron density of Ni in Ni2P, and the Ni and P contents, while it created new P-OH groups and reduced the amount of surface Ni sites. We propose a surface model of Ni2P/SiO2 containing the Ni sites and the P-OH groups and consider that the synergism between the Ni site and the P-OH group can explain the promoting effect due to H2O and O-2 on the activity of Ni2P/SiO2, and the synergism mainly took place on the Ni2P particles and at the interface between the Ni2P particles and SiO2.
机译：据报道，一种有效的方法是增强Ni2p/SiO2催化剂对氯苯（CB）氢化氯化的活性。在大气压下，513 K，A CB WHSV为4.1 h（-1）和H-2/CB摩尔比为9.0，Ni2p/siO2的氯苯转化率为5.6％。令人惊讶的是，在Ni2p/siO2用0.8-3.0％H2O/H-2流以下的543 K以下的0.8-3.0％的水平进行预处理后，转化率高达99％。随着预处理温度的升高，转换趋于降低。然而，即使在673 K的预处理温度下，仍然获得了42.6％的转化率。当将0.8％H2O或0.5％O-2引入反应系统时，NI2P/SIO2的活性也得到了改善。另外，Ni2p/siO2的钝化随后还原导致33％的转化。预处理之前和之后的Ni2p/SiO2催化剂的特征是N-2求可，XRD，ICP-AES，XPS，XPS，原位漂移以及H-2-和NH3-TPD。结果表明，预处理并不明显影响特定的表面积，孔结构，Ni2p结晶石大小，Ni2p中Ni的电子密度以及Ni和P内容，同时创建了新的P-OH组并减少了表面的量。 NI站点。我们提出了一个含有Ni位点和P-OH组的Ni2p/SiO2的表面模型，并认为Ni位点和P-OH组之间的协同作用可以解释由于H2O和O-2对H2O和O-2对活动的促进效应对Ni2p/siO2，协同作用主要发生在Ni2p颗粒上以及Ni2p颗粒和SIO2之间的界面上。

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