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首页> 外文期刊>Macromolecular reaction engineering >Effect of Hydrogen and External Donor on Propylene Polymerization Kinetics with a 4~th-Generation Ziegler-Natta Catalyst
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Effect of Hydrogen and External Donor on Propylene Polymerization Kinetics with a 4~th-Generation Ziegler-Natta Catalyst

机译：氢和外给体对第四代齐格勒-纳塔催化剂丙烯聚合动力学的影响

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摘要

Apparent kinetic rate constants and activation energies for catalyst activation, deactivation, and propylene propagation with a 4th-generation Ziegler-Natta catalyst are estimated. The rate of polymerization in the presence of donor and hydrogen is higher than in their absence. Catalyst activation and propagation rate constants increase with the addition of hydrogen, likely because hydrogen frees 2-1-terminated dormant sites. The deactivation term was the highest without electron donor, presumably because the nonspecific sites deactivate faster than the specific sites. Apparent activation energies for catalyst activation, deactivation, and propagation are not significantly influenced by the presence of hydrogen or external donor, indicating that they do not affect these mechanisms substantially.
机译：估算了第四代齐格勒-纳塔催化剂的催化剂活化，失活和丙烯扩散的表观动力学速率常数和活化能。在供体和氢存在下的聚合速率高于在不存在供体和氢气的情况下的聚合速率。催化剂的活化和传播速率常数随氢的添加而增加，这可能是因为氢释放了2-1末端的休眠位。在没有电子给体的情况下，失活期是最高的，大概是因为非特异性位点的失活速度比特定位点快。氢或外部给体的存在不会明显影响催化剂活化，失活和扩散的表观活化能，表明它们基本上不会影响这些机理。

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