Abstract

Cracking and isomerization of n-alkanes, employing bifunctional catalysts, are vital reactions in various refinery processes for producing different high-quality fuels. These catalysts consist of a specific metal component and a specific acid function. The metal component is used for dehydrogenation and hydrogenation constituted from a specific noble metal such as palladium and platinum. The acid function, on the other hand, is used for cracking and isomerization aims. In this work, a number of mesoporous catalysts with different ratios of Si/Ti based on MSU containing Platinum were synthesized and characterized with XRF, XRD, NH₃–TPD, and BET tests. These catalysts were applied in n-heptane hydroconversion process in a fixed bed microreactor to see their performance in an actual process. In the microreactor, the pressure was constant (atmospheric), and the temperature varies in the range of 250–600°C. The performance of each of the catalysts was investigated in different ratios of hydrogen to hydrocarbon (5, 10, 15, 20, and 25) and in two values of Weight Hour Space Velocity (WHSV) (1.5 and 2.5 h^–1). Products analysis carried out to check out the activity and selectivity of each of the catalysts. The result showed that all samples have a high surface area, favorable pore distribution, and high acidity. The outcome of the study showed that the CAT-D catalyst has the highest activity for normal heptane conversion. This catalyst also has the highest selectivity for isomerization products at moderate temperatures (350°C) and WHSV = 1.5 h^–1.

中文翻译：

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在微型反应器中双功能Pt-Ti-MSU / Al-Ti-MSU催化剂上正庚烷的加氢转化

摘要

使用双功能催化剂的正构烷烃的裂化和异构化在各种精炼工艺中生产不同的高质量燃料都是至关重要的反应。这些催化剂由特定的金属组分和特定的酸官能团组成。该金属组分用于由特定的贵金属例如钯和铂构成的脱氢和氢化。另一方面，酸官能团用于裂化和异构化目的。在这项工作中，基于含铂的MSU，合成了许多具有不同Si / Ti比的介孔催化剂，并通过XRF，XRD，NH ₃ -TPD和BET测试对其进行了表征。这些催化剂在被应用ñ固定床微反应器中进行正庚烷加氢转化过程，以了解其在实际过程中的性能。在微反应器中，压力是恒定的（大气压），温度在250–600°C的范围内变化。在氢与碳氢化合物的不同比例（5、10、15、20和25）和两个重时空速（WHSV）值（1.5和2.5 h ^–1）下研究了每种催化剂的性能。）。进行产物分析以检查每种催化剂的活性和选择性。结果表明，所有样品均具有高表面积，有利的孔分布和高酸度。研究结果表明，CAT-D催化剂具有正常庚烷转化率最高的活性。在中等温度（350°C）和WHSV = 1.5 h ^–1时，该催化剂对异构化产物的选择性也最高。