The kinetics of selective hydrogenation of acetylene in the liquid phase over a commercial 0.5 wt % Pd/Al₂O₃ spherical catalyst was investigated in a stirred-tank basket reactor. The liquid phase was acetylene gas absorbed in a selective solvent, N-methylpyrrolidone (NMP). The reactor was operated at a pressure range of 15–250 psig with temperature varying from 60 to 100 °C using different catalyst loadings to identify the suitable operating conditions. The kinetic experiments were conducted in the absence of external mass transfer resistances with the liquid phase in batch mode and the gas phase being continuous. The initial rates varied linearly with the increase in catalyst loading at different temperatures. An intrinsic kinetic model was developed using the power-law model and Langmuir–Hinshelwood–Hougen–Watson (LHHW) approach. The reaction was surface reaction limited with negligible intraparticle diffusion, as estimated from the Thiele modulus and Weisz–Prater criterion. The surface reaction between the adsorbed species was assumed to be the rate-controlling step. The LHHW model provided a good fit to the experimental data, and the intrinsic kinetic rate parameters were estimated.

中文翻译：

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在商业钯/氧化铝催化剂上使用选择性溶剂乙炔液相加氢生产乙烯的动力学研究

在搅拌釜篮式反应器中研究了在商用0.5 wt% Pd/Al ₂ O ₃球形催化剂上液相乙炔选择性加氢的动力学。液相是吸收在选择性溶剂N-甲基吡咯烷酮(NMP)中的乙炔气体。反应器在 15–250 psig 的压力范围内运行，温度在 60 至 100 °C 之间变化，使用不同的催化剂负载量来确定合适的操作条件。动力学实验是在没有外部传质阻力的情况下进行的，液相为间歇模式，气相为连续模式。在不同温度下初始速率随着催化剂负载量的增加而线性变化。使用幂律模型和 Langmuir-Hinshelwood-Hougen-Watson (LHHW) 方法开发了内在动力学模型。根据蒂勒模量和 Weisz-Prater 准则估计，该反应是表面反应，颗粒内扩散可忽略不计。吸附物质之间的表面反应被认为是速率控制步骤。 LHHW 模型与实验数据吻合良好，并估计了内在动力学速率参数。