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| 1 | Propane catalytic cracking on pretreated La-ZSM-5 zeolite during calcination for light olefins production显示文摘The purpose of this study was to increase light olefins yield and selectivity in catalytic cracking of propane. Pretreatment of ZSM-5 zeolite was performed during calcination. First, lanthanum was loaded on the catalyst by wet impregnation method and then the effect of parameters, such as temperature(400–800 oC), time(120–480 min) and type of stream, on La-ZSM-5 zeolite was examined during calcination using central composite design(CCD) method. Based on the proposed models, the optimized condition for maximizing selectivity of light olefins for air stream was 680 oC and 310 min and for the nitrogen stream was 735 oC and 173 min that under these conditions, selectivity amount increased 24% for nitrogen stream and 19% for air stream as compared with H-ZSM-5 catalyst. The synthesized catalysts were characterized by X-ray diffraction(XRD) and temperature-programmed desorption(TPD) techniques. According to the results of NH_3-TPD, as the temperature increased, the number of strong acid sites(specially Bronsted acid sites) reduced and resulted in increased production of light olefins as well as catalyst stability. Accordingly, stability of the samples calcined with nitrogen stream was higher than the samples calcined with the air stream. | Roya Pouria Leyla Vafi Ramin Karimzadeh | 2017 | Journal of Rare Earths2017，35，6： | 4 |
| 2 | 劣质原油高效转化且增产低碳烯烃的择型分子筛研究进展显示文摘现有催化裂化多产低碳烯烃技术优先以石蜡基蜡油或常压渣油为原料油,原油重质化和高硫化限制了该技术的深入发展与推广应用。择型分子筛由于硅铝比及孔结构较为突出,具有适合重质油裂解的反应性能,得到广泛应用。为了更好的提高低碳烯烃的产率及选择性,对择型分子筛进行改性,通过调整分子筛的基础性质,使之成为优良的活性中心。重点介绍多种择型分子筛包括ZSM-5、β、SAPO-34、MCM-22等,并对其现有改性方法主要是以酸、碱改性及金属、非金属改性为主进行综述,并从其改性后的性能包括孔道结构优化、水热稳定性保留及裂化能力增强等方面阐述分子筛改性研究进展。 | 张杰潇 田辉平 凤孟龙 李家兴 | 2018 | 工业催化2018，26，10： | 2 |
| 3 | 丝光沸石的离子交换及催化性能研究显示文摘以市售的钠型丝光沸石为母体,考察了盐酸和硫酸处理对分子筛物化性质的影响,比较了不同酸处理和铵交换得到的样品在甲苯歧化与烷基转移反应中的性能。结果表明:酸洗方式可以实现分子筛中钠离子的完全脱除,通过酸洗可以提高分子筛的硅铝比,降低酸密度和单位酸量,达到脱铝的效果,从而实现酸催化反应稳定性的提高,延长催化剂使用寿命。 | 宋军 | 2019 | 石油化工技术与经济2019，35，4： | 0 |
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