Synthesis of Nanoscale ZSM-5 Zeolites for the Catalytic Cracking of Oleic Acid into Light Olefins and Aromatics

IF 3.9 3区 化学 Q2 POLYMER SCIENCE
Hao Liu, Yanlin Wang, Hong Yuan, Wenbo Luo
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Abstract

Nanoscale ZSM-5 zeolites (NZSM-5) having different crystal sizes and Si/tetrapropylammonium hydroxide (TPAOH) molar ratios were synthesized using a hydrothermal method. These materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N2 adsorption–desorption. The results showed that each zeolite was highly crystalline regardless of the Si/TPAOH ratio and that the Brunauer–Emmett–Teller surface areas were in the range of 329−392 m2/g. The random aggregation of these nanoparticles resulted in the formation of numerous intergranular mesopores. These NZSM-5 zeolites were applied to the catalytic cracking of oleic acid to prepare light olefins and light aromatics using a laboratory-scale fixed bed reactor. The zeolite having a Si/TPAOH ratio of 10/5 showed the best catalytic activity and provided light olefins yield of 55% and selectivity of BTX in liquid phase products of 18%, respectively, at 500 °C. The small crystal size and abundant intergranular mesopores in this specimen resulted in shorter diffusion paths and an increase in the external specific surface area that both inhibited coke deposition and ensured accessible acid sites.

Graphical Abstract

Abstract Image

合成纳米级 ZSM-5 沸石用于油酸催化裂化成轻烯烃和芳烃
采用水热法合成了具有不同晶体尺寸和硅/四丙基氢氧化铵(TPAOH)摩尔比的纳米级 ZSM-5 沸石(NZSM-5)。通过 X 射线衍射、扫描电子显微镜、透射电子显微镜和 N2 吸附-解吸对这些材料进行了表征。结果表明,无论 Si/TPAOH 的比例如何,每种沸石都具有很高的结晶度,布鲁瑙尔-艾美特-泰勒比表面积在 329-392 m2/g 之间。这些纳米颗粒的随机聚集形成了大量的晶间中孔。利用实验室规模的固定床反应器,将这些 NZSM-5 沸石用于催化裂解油酸,制备轻烯烃和轻芳烃。Si/TPAOH 比率为 10/5 的沸石显示出最佳的催化活性,在 500 °C 时,轻烯烃产量为 55%,液相产品中 BTX 的选择性为 18%。这种试样的晶体尺寸小,晶间中孔多,因此扩散路径短,外比表面积增大,既抑制了焦炭沉积,又确保了可获得的酸位点。
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来源期刊
CiteScore
8.30
自引率
7.50%
发文量
335
审稿时长
1.8 months
期刊介绍: Journal of Inorganic and Organometallic Polymers and Materials [JIOP or JIOPM] is a comprehensive resource for reports on the latest theoretical and experimental research. This bimonthly journal encompasses a broad range of synthetic and natural substances which contain main group, transition, and inner transition elements. The publication includes fully peer-reviewed original papers and shorter communications, as well as topical review papers that address the synthesis, characterization, evaluation, and phenomena of inorganic and organometallic polymers, materials, and supramolecular systems.
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