Novel SOx removal catalysts for the FCC process: Manufacture method, characterization, and pilot-scale testing
Novel SOx removal catalysts for the FCC process: Manufacture method, characterization, and pilot-scale testing
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DOI：
10.1039/c1ee01197a
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发表时间：
2011-09
影响因子：
32.5
通讯作者：
J. Valente;R. Quintana-Solórzano
中科院分区：
文献类型：
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作者：
J. Valente;R. Quintana-Solórzano
提出了一种制备多金属层状双金属氢氧化物（LDHs）流化催化裂化（FCC）脱硫（ReSOx）催化剂的新方法。该合成方法具有工业可行性和环境友好性。氧化铈以不同量作为氧化促进剂掺入，以获得能够在部分或完全燃烧再生器模式下有效工作的催化剂。本文提出的制造方法能够通过喷雾干燥获得具有足以流化的机械性能的微球颗粒，而不需要添加粘合剂。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）等表征技术对催化剂的物理化学性质进行了研究。在整个颗粒中观察到金属组分的均匀分散。此外，在从墨西哥炼油厂获得的含硫工业瓦斯油的转化过程中，在中试规模的FCC装置中，与常规裂化催化剂一起循环，测试微球形催化剂用于减少SOx排放。仅以总催化剂存量的0.2wt%将ReSOx催化剂添加到中试FCC装置中，导致74- 80%的最大%SO2减少。此外，研究了ReSOx催化剂对主要裂化反应的影响;结果表明，在总催化剂库存的1.5重量%的浓度下，裂化催化剂的活性和选择性的破坏是最小的。因此，这些SOx去除催化剂的使用似乎是一种可行的、低投资的、灵活的和有效的选择，用于原位减少SOx烟道气排放。
A novel method for preparing SOx removing (ReSOx) catalysts for the fluid catalytic cracking (FCC) process, based on multimetallic layered double hydroxides (LDHs), is presented. The synthesis procedure is industrially feasible and environmentally friendly. Ceria is incorporated in varying amounts as oxidation promoter, to obtain catalysts that are able to work efficiently in either partial or full combustion regenerator modes. The manufacturing process presented herein enables obtaining, by spray drying, microsphere particles with mechanical properties that are adequate for fluidization, without requiring addition of binding agents. The physicochemical properties of the catalysts are examined by several characterization techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). A uniform dispersion of the metal components is observed throughout the particles. Furthermore, the microspheroidal catalysts are tested for the reduction of SOx emissions in a pilot-scale FCC plant, circulating together with a conventional cracking catalyst, during the conversion of a sulphur-containing industrial gas oil obtained from a Mexican refinery. ReSOx catalyst addition to the pilot FCC unit, in only 0.2 wt% of the total catalyst inventory, results in a maximum %SO2reduction of 74–80%. Additionally, the effect of the ReSOx catalyst on the main cracking reactions is studied; it is shown that the disruption of the cracking catalyst's activity and selectivity is minimal, at a concentration of 1.5 wt% of the total catalyst inventory. Thus, the use of these SOx removal catalysts appears as a viable, low investment, flexible and effective option for in situreduction of SOx flue gas emissions.