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Effect of the Zeolite Type on Catalytic Performance in Dewaxing of the Diesel Fraction under Sour Conditions
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.energyfuels.1c01484 Olga A. Kosareva 1 , Denis N. Gerasimov 1 , Igor A. Maslov 1 , Irina V. Pigoleva 1 , Svetlana V. Zaglyadova 1 , Vadim V. Fadeev 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.energyfuels.1c01484 Olga A. Kosareva 1 , Denis N. Gerasimov 1 , Igor A. Maslov 1 , Irina V. Pigoleva 1 , Svetlana V. Zaglyadova 1 , Vadim V. Fadeev 1
Affiliation
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Dewaxing by isomerization is widely used to produce winter and arctic grades of diesel fuel. Preliminary feed hydrotreatment and pure hydrogen are usually used in order to avoid poisoning of the catalyst by sulfur and nitrogen. However, combining hydrotreatment and dewaxing in one reactor has some advantages, such as lower capital and operating costs. In such a configuration, a dewaxing catalyst works in sour environments, defined by sulfur and nitrogen presented in the feed stream. In the presented work, Pt-containing catalysts based on commercial zeolites with one-dimensional channels and their mixtures (ZSM-23, ZSM-22, ZSM-12, EU-2, SAPO-11, ZSM-23+ZSM-12, and ZSM-23+EU-2) were prepared, characterized using different analytical techniques (X-ray diffraction, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma atomic emission spectroscopy, N2 sorption, and infrared spectroscopy), and tested in dewaxing of the diesel fraction under sour conditions. It was found that catalyst activity, dewaxed product yield, and quality indicators (aromatic hydrocarbon content and density) were highly sensitive to zeolite channel size, while catalyst acidity and zeolite crystal size were less important factors. The highest activity was shown by catalysts based on EU-2 and ZSM-12, which had the widest channels. The highest product yield was observed for the catalyst based on EU-2, which had a medium channel size among compared zeolites. Wider zeolite channels promoted the metal function of catalysts that led to a decrease in the aromatic hydrocarbon content of dewaxed products. Using the mixtures of ZSM-23+ZSM-12 and ZSM-23+EU-2 did not lead to visible synergetic effects. Using different binder materials (Al2O3, TiO2, and ZrO2) did not significantly affect the quality or yield of dewaxed products.
中文翻译：
沸石类型对酸性条件下柴油馏分脱蜡催化性能的影响
异构化脱蜡广泛用于生产冬季和北极级柴油燃料。通常使用预加氢处理和纯氢以避免催化剂被硫和氮中毒。然而，在一个反应器中结合加氢处理和脱蜡具有一些优势，例如较低的资本和运营成本。在这种配置中，脱蜡催化剂在由进料流中存在的硫和氮定义的酸性环境中工作。在目前的工作中，基于具有一维通道的商业沸石及其混合物（ZSM-23、ZSM-22、ZSM-12、EU-2、SAPO-11、ZSM-23+ZSM-12、和 ZSM-23+EU-2)，使用不同的分析技术（X 射线衍射、扫描电子显微镜、透射电子显微镜、2吸附和红外光谱），并在酸性条件下对柴油馏分进行脱蜡测试。发现催化剂活性、脱蜡产物收率和质量指标（芳烃含量和密度）对沸石通道尺寸高度敏感，而催化剂酸度和沸石晶体尺寸不是那么重要的因素。基于 EU-2 和 ZSM-12 的催化剂表现出最高的活性，它们具有最宽的通道。观察到基于 EU-2 的催化剂的最高产物收率，其在比较沸石中具有中等通道尺寸。更宽的沸石通道促进了催化剂的金属功能，导致脱蜡产品的芳烃含量降低。使用 ZSM-23+ZSM-12 和 ZSM-23+EU-2 的混合物不会导致明显的协同效应。2 O 3、TiO 2和ZrO 2 )对脱蜡产品的质量或产量没有显着影响。
更新日期：2021-10-07
中文翻译：
沸石类型对酸性条件下柴油馏分脱蜡催化性能的影响
异构化脱蜡广泛用于生产冬季和北极级柴油燃料。通常使用预加氢处理和纯氢以避免催化剂被硫和氮中毒。然而，在一个反应器中结合加氢处理和脱蜡具有一些优势，例如较低的资本和运营成本。在这种配置中，脱蜡催化剂在由进料流中存在的硫和氮定义的酸性环境中工作。在目前的工作中，基于具有一维通道的商业沸石及其混合物（ZSM-23、ZSM-22、ZSM-12、EU-2、SAPO-11、ZSM-23+ZSM-12、和 ZSM-23+EU-2)，使用不同的分析技术（X 射线衍射、扫描电子显微镜、透射电子显微镜、2吸附和红外光谱），并在酸性条件下对柴油馏分进行脱蜡测试。发现催化剂活性、脱蜡产物收率和质量指标（芳烃含量和密度）对沸石通道尺寸高度敏感，而催化剂酸度和沸石晶体尺寸不是那么重要的因素。基于 EU-2 和 ZSM-12 的催化剂表现出最高的活性，它们具有最宽的通道。观察到基于 EU-2 的催化剂的最高产物收率，其在比较沸石中具有中等通道尺寸。更宽的沸石通道促进了催化剂的金属功能，导致脱蜡产品的芳烃含量降低。使用 ZSM-23+ZSM-12 和 ZSM-23+EU-2 的混合物不会导致明显的协同效应。2 O 3、TiO 2和ZrO 2 )对脱蜡产品的质量或产量没有显着影响。
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