粉煤灰基Silicalite-1分子筛用于吉木萨尔页岩油催化裂化反应性能的研究

Hydrocracking Performance of fly ash-Based Silicalite-1 for Jimsar Shale Oil

中文关键词:  粉煤灰  Silicalite-1分子筛  页岩油  加氢催化裂化  提质

英文关键词:Fly ash  Silicalite-1 molecular sieve  Shale oil  Hydrocracking  Upgrading

中文摘要:

      摘要：粉煤灰是燃煤电厂排放的大量工业废弃物，对其进行资源化利用具有重要的现实意义。本研究以粉煤灰为原料，探索了一种绿色环保的 Silicalite-1 分子筛合成方法，并考察了其在页岩油加氢裂化提质中的应用潜力。研究者首先以化学提取法从粉煤灰中提取出高纯度的二氧化硅，然后以其为硅源，采用水热合成法制备了 Silicalite-1 分子筛。系统的研究了晶化时间、晶化温度、水硅比和模板剂对 Silicalite-1 分子筛合成的影响，确定了最佳合成条件为：晶化时间12 h，晶化温度180 ℃，水硅摩尔比48:1，模板剂为 TPAOH。在此条件下制备的 Silicalite-1分子筛展现出了良好的结晶度。随后，将合成的 Silicalite-1 分子筛作为催化剂，用于催化加氢裂化吉木萨尔页岩油馏分（220 ℃）。研究发现，Silicalite-1 分子筛在页岩油加氢裂化反应中表现出良好的催化活性，能够有效地将柴油馏分转化为汽油馏分，提高页岩油的轻质化率。通过优化反应条件，确定了最佳反应温度为250 ℃，最佳反应压力为3 MPa。在此条件下，吉木萨尔页岩油馏分中柴油组分的转化率高达9.43%。本研究结果表明，以粉煤灰为原料合成的 Silicalite-1 分子筛在页岩油加氢裂化提质方面具有良好的应用前景，为粉煤灰的高附加值利用和页岩油的高效转化提供了一种新思路。

英文摘要:

      opportunity for resource utilization. This study explored an environmentally friendly method for synthesizing Silicalite-1 molecular sieves from fly ash and investigated their potential in upgrading shale oil through hydrocracking. High-purity silica was first extracted from fly ash using a chemical extraction method. This silica served as the silicon source for synthesizing Silicalite-1 molecular sieves via a hydrothermal method. The influence of crystallization time, temperature, water-silicon ratio, and templating agent on Silicalite-1 synthesis was systematically investigated. The optimal synthesis conditions were determined to be: crystallization time of 12 h, crystallization temperature of 180 ?C, water-silicon molar ratio of 48:1, and TPAOH as the templating agent. The Silicalite-1 molecular sieves prepared under these conditions exhibited good crystallinity. The synthesized Silicalite-1 was then used as a catalyst for the hydrocracking of Jimsar shale oil fractions (below 220 ?C). The results showed that Silicalite-1 exhibited good catalytic activity in the hydrocracking reaction, effectively converting the diesel fraction into gasoline and increasing the yield of light oil fractions. The optimal reaction conditions were determined to be a reaction temperature of 250 ?C and a reaction pressure of 3 MPa. Under these conditions, the conversion rate of the diesel fraction in the Jimsar shale oil reached 9.43%. This study demonstrates the promising potential of fly ash-derived Silicalite-1 for upgrading shale oil via hydrocracking, offering a novel approach for both high-value fly ash utilization and efficient shale oil conversion.