Nonmetallic boron nitride embedded graphitic carbon catalyst for oxidative dehydrogenation of ethylbenzene,Catalysis Science & Technology

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Nonmetallic boron nitride embedded graphitic carbon catalyst for oxidative dehydrogenation of ethylbenzene
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020/01/24 , DOI: 10.1039/c9cy02342a
Jian Sheng _{1,

2,

3,

4} , Bing Yan _{1,

2,

3,

4} , Bin He _{1,

2,

3,

4} , Wen-Duo Lu _{1,

2,

3,

4} , Wen-Cui Li _{1,

2,

3,

4} , An-Hui Lu _{1,

2,

3,

4}

Affiliation

Oxidative dehydrogenation of ethylbenzene to styrene featured with a non-equilibrium-limit is an alternative to the direct dehydrogenation process, but often exhibits low styrene selectivity caused by deep-oxidation over metal oxide catalysts. Herein, we report a nonmetallic BN embedded graphitic carbon catalyst which was synthesized by a one-step co-pyrolysis method using boric acid, urea and ammonium iron citrate as the reactants. The obtained catalyst exhibits a high styrene selectivity of 94%. The existence of abundant carbonyl groups and BO species could correspondingly contribute more reaction sites and extra oxygen adsorption sites. A higher styrene formation rate of 5.8 mmol g_cat⁻¹ h⁻¹ is thus achieved for our BN embedded graphitic carbon catalyst, whereas this value is 3.4 mmol g_cat⁻¹ h⁻¹ for sole carbon nanotubes and 0.2 mmol g_cat⁻¹ h⁻¹ for BN. Such promoted reactivity for oxidative dehydrogenation of ethylbenzene is derived from the synergetic and collaborative effect of the nonmetallic BN and graphitic carbon catalyst.

中文翻译：

非金属氮化硼嵌入石墨碳催化剂用于乙苯的氧化脱氢

具有非平衡极限的乙苯氧化脱氢制苯乙烯是直接脱氢工艺的一种替代方法，但由于在金属氧化物催化剂上的深度氧化，常常表现出较低的苯乙烯选择性。在本文中，我们报道了一种非金属的BN嵌入石墨碳催化剂，该催化剂是通过使用硼酸，尿素和柠檬酸铁铵作为反应物的一步共热解法合成的。所获得的催化剂表现出94％的高苯乙烯选择性。丰富的羰基和BO物种的存在可以相应地贡献更多的反应位点和额外的氧吸附位点。更高的苯乙烯形成速率为5.8 mmol g _cat^-1 h ^-1因此，对于我们的BN嵌入石墨碳催化剂，可实现最大碳当量，而对于唯一的碳纳米管，该值为3.4 mmol g _cat^-1 h ^-1；对于BN，该值为0.2 mmol g _cat^-1 h ^-1。乙苯氧化脱氢的这种提高的反应性源自非金属BN和石墨碳催化剂的协同和协同作用。

更新日期：2020-03-26

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