Abstract

Conversion of LPG as an abundance and cheap feedstock to valuable aromatic compounds was studied over modified ZSM-5 zeolite. First, optimum reaction conditions such as temperature, wight hour space velocity (WHSV) and feedstock composition were obtained. Subsequently, Ga and Zn were used as suitable metals for catalyst promotion. Zeolite/metal ratios between 0.2 and 1%wt. were papered and were tested in WHSV values of 3 to 12, temperatures between 470 and 510 °C and propane, butane, and LPG as feed. Results showed Ga-promotion in low concentrations influences catalyst lifetime and aromatic selectivity for butane cut, while Zn made the same development for propane feed at high concentrations. As an interesting fact, it was observed that Ga wins the competition with Zn when LPG in consumed as feed in a slight difference. Promoter selection between Ga and Zn depends on LPG composition which in this research Ga showed better performance according to the industrial feed.

摘要

在改性 ZSM-5 沸石上研究了将 LPG 作为一种丰富且廉价的原料转化为有价值的芳香族化合物。首先，获得了最佳反应条件，如温度、重量空速（WHSV）和原料组成。随后，Ga和Zn被用作催化剂促进的合适金属。沸石/金属的比例在 0.2 和 1% 之间。被纸化并在 3 至 12 的 WHSV 值、470 至 510 °C 的温度和丙烷、丁烷和液化石油气作为进料的条件下进行测试。结果表明，低浓度的 Ga 促进作用会影响催化剂寿命和丁烷馏分的芳烃选择性，而 Zn 对高浓度的丙烷进料也有同样的影响。作为一个有趣的事实，观察到当 LPG 作为饲料消耗时，Ga 与 Zn 的竞争略有不同。