Kinetic modeling, thermodynamic, and mass-transfer studies of gas-phase glycerol dehydration to acrolein over supported silicotungstic acid catalyst
Kinetic modeling, thermodynamic, and mass-transfer studies of gas-phase glycerol dehydration to acrolein over supported silicotungstic acid catalyst
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DOI：
10.1021/acs.iecr.5b02172
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发表时间：
2015-08
影响因子：
4.2
通讯作者：
Amin Talebian-Kiakalaieh;N. Amin
中科院分区：
文献类型：
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作者：
Amin Talebian-Kiakalaieh;N. Amin
在填充床反应器中，研究了高活性、高稳定性的负载型硅钨酸催化剂（30 HZ-20 A）催化甘油气相脱水反应的动力学。动力学研究是基于响应面法确定的最佳反应条件。反应速率符合一级动力学方程，活化能E = 27.5kJ/mol，频率因子A = 5.35 × 105 s-1。根据热力学分析，吸热反应的ΔH°和ΔS°分别为14.70和0.09 kJ/（mol K），ΔG° = −12.12 kJ/mol。传质分析表明，dp < 1 μm的颗粒在反应限制条件下进行。实验结果证实，由于单位有效因子和非常低的Thiele模量，所测试的催化剂具有高效率。
The kinetics of gas-phase glycerol dehydration in a packed-bed reactor over a highly active and stable supported silicotungstic acid catalyst with zirconium oxide and nanosized aluminum oxide (30HZ-20A) was investigated. The kinetic study is based on the optimal reaction conditions determined by response surface methodology. The reaction rate followed first-order kinetics with the activation energy and frequency factor, E = 27.5 kJ/mol and A = 5.35 × 105 s–1, respectively. Based on thermodynamic analysis, the values of ΔH° and ΔS° of the endothermic reaction were 14.70 and 0.09 kJ/(mol K), respectively, and ΔG° = −12.12 kJ/mol. The mass-transfer analysis revealed the pellet sizes of dp < 1 μm proceeded under reaction-limiting conditions. Experimental results confirmed high efficacy of the tested catalyst due to unity effectiveness factor and very low Thiele modulus.