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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Fluoride-free synthesis of mesoporous [Al]-[B]-ZSM-5 using cetyltrimethylammonium bromide and methanol-to-olefin activity with high propene selectivity
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Fluoride-free synthesis of mesoporous [Al]-[B]-ZSM-5 using cetyltrimethylammonium bromide and methanol-to-olefin activity with high propene selectivity

机译：使用甲酰基三甲基溴化铵和具有高丙烯选择性的氟氯吡啶铵和甲醇 - 烯烃活性的无氟[Al] - [B] -ZSM-5

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摘要

Large ZSM-5 crystals containing [B]-sites and mesopores with 2.5 nm pore sizes are synthesized in a fluoride-free, low OH- medium using cethyltrimethylammonium bromide as mesoporogen and 1,6-diaminohexane as structure directing agent. Absence of extra-framework Al sites and low concentrations of silanol sites are evidenced by Al-27 MAS-NMR and in-situ FTIR analysis. The low-defect containing [Al]-[B]-ZSM-5 (Mes-[Al]-[B]-ZSM-5) is evaluated for catalyzing the methanol-to-olefins reaction and found to result in low coke formation (4.1 mg g(-1) h(-1)) and very low alkane and aromatic formation rates. The propene to ethene ratio of 4.3 observed using Mes-[Al]-[B]-ZSM-5 is found to be superior to that (1.9) of a nano-sized [Al]-[B]-ZSM-5 (crystal sizes around 36 nm). Small particle sizes for nano-sized [Al]-[B]-ZSM-5 is found to be effective for supplying a higher coke tolerance, but insignificant for olefin product selectivity.
机译：以十六烷基三甲基溴化铵为介孔剂，1,6-二氨基己烷为结构导向剂，在无氟低OH介质中合成了含有[B]位的大ZSM-5晶体和孔径为2.5nm的介孔。Al-27 MAS-NMR和原位FTIR分析表明，没有额外的骨架铝位和低浓度的硅醇位。评估了含有[Al]-[B]-ZSM-5（Mes-[Al]-[B]-ZSM-5）的低缺陷对甲醇制烯烃反应的催化作用，发现其导致低结焦（4.1 mg g（-1）h（-1））和极低的烷烃和芳香族生成速率。发现使用Mes-[Al]-[B]-ZSM-5观察到的丙烯与乙烯的比率为4.3，优于纳米[Al]-[B]-ZSM-5（晶体尺寸约36 nm）的（1.9）。研究发现，纳米[Al]-[B]-ZSM-5的小颗粒尺寸对于提供更高的耐焦性是有效的，但对于烯烃产品的选择性则无关紧要。

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