Ethylbenzene Transformation over a ZSM-5-Based Catalyst in a Riser Simulator
Ethylbenzene Transformation over a ZSM-5-Based Catalyst in a Riser Simulator
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DOI：
10.1021/ie801609x
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发表时间：
2009-02
影响因子：
4.2
通讯作者：
S. Al-Khattaf;N. Tukur;S. Rabiu
中科院分区：
文献类型：
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作者：
S. Al-Khattaf;N. Tukur;S. Rabiu
在模拟流化床反应器操作的提升管模拟器中，在ZSM-5型催化剂上研究了催化剂的转化。该研究在350、375、400、450和500 °C下进行，反应时间为3、5、7、10、13和15秒。本文报道了反应条件对裂解产物C/D、二乙苯（DE B）异构体（m-DE B和p-DE B）分布和苯/二乙苯（B/DE B）比值的影响。实验结果采用准稳态近似。歧化反应在低温（350 - 400 °C）下占主导地位，而裂解反应在高温（>400 °C）下变得重要。因此，假设两种机制来表示在转化反应期间的氧化物的消失（一种机制用于低温，另一种机制用于所考虑的整个温度范围）。动力学参数，用于消失的过程中的磷。
The transformation of ethylbenzene has been studied over a ZSM-5-type catalyst in a riser simulator that mimics the operation of a fluidized-bed reactor. The study was conducted at 350, 375, 400, 450, and 500 °C for reaction times of 3, 5, 7, 10, 13, and 15 s. The effect of reaction conditions on the ratio of cracking to disproportionation products (C/D), the distribution of diethylbenzene (DEB) isomers (m-DEB and p-DEB), and the ratio of benzene/diethylbenzenes (B/DEB) are reported. The experimental results were modeled using quasi-steady-state approximation. Disproportionation was determined to dominate at low temperatures (350−400 °C), while cracking reaction becomes significant as higher temperatures (>400 °C). Thus, two mechanisms were postulated to represent the disappearance of ethylbenzene during the transformation reaction (one mechanism for low temperature, and another for the complete temperature range considered). Kinetic parameters that were used for the disappearance of ethylbenzene during t...