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首页> 外文期刊>Fuel >Fly ash-supported cerium triflate as an active recyclable solid acid catalyst for Friedel-Crafts acylation reaction
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Fly ash-supported cerium triflate as an active recyclable solid acid catalyst for Friedel-Crafts acylation reaction

机译：粉煤灰负载的三氟甲磺酸铈作为弗瑞德-克拉夫茨酰化反应的活性可循环使用的固体酸催化剂

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摘要

An efficient solid Lewis acid, has been synthesized by loading cerium triflate (7 wt%) on the acid activated fly ash with high silica content (81%). The physico-chemical properties of synthesized fly ash-supported cerium triflate catalyst (CFT) were monitored by XRD, FT-IR spectroscopy, FT-IR spectroscopy of the ammonia adsorbed catalyst, SEM-EDAX, TEM, Flame Atomic Absorption Spectrophotometer and TG-DTA study. The increased concentration of silica surface hydroxyl groups on activated fly ash have a major influence on the loading of cerium triflate. The catalytic activity of the catalyst CFT was tested in the acylation of veratrole using acetic anhydride as the acylating agent. The proposed model structure of CFT shows that the triflate species withdraws the electron density from the surface cerium making it electron deficit and generate Lewis acidity on the surface of fly ash as confirmed by NH3 adsorbed FT-IR spectrum. The activity data indicate that this heterogeneous catalyst is very active, corresponding to high conversion (88%) of veratrole to 3,4-dimethoxyacetophenone. The catalyst could be easily recovered and reused giving similar conversion up to three reaction cycles indicating its stability under experimental conditions. Thus fly ash-supported cerium triflate is a novel and efficient catalyst and is a promising way of bulk utilization of waste fly ash by developing cost effective catalyst system for industrially important Friedel-Crafts acylation reactions.
机译：通过将三氟甲磺酸铈（7 wt％）负载在高二氧化硅含量（81％）的酸活化粉煤灰上，已合成了一种有效的固体路易斯酸。用XRD，FT-IR光谱，氨吸附催化剂的FT-IR光谱，SEM-EDAX，TEM，火焰原子吸收分光光度计和TG-TG监测合成的粉煤灰负载三氟甲磺酸铈催化剂（CFT）的理化性质。 DTA研究。活性粉煤灰中二氧化硅表面羟基浓度的增加对三氟甲磺酸铈的负载量有重大影响。使用乙酸酐作为酰化剂，在对四氢呋喃酰化反应中测试了催化剂CFT的催化活性。拟议的CFT模型结构表明，三氟甲磺酸盐类物质从铈表面抽出电子密度，使其电子不足，并在粉煤灰表面产生路易斯酸度，这已被NH3吸附的FT-IR光谱所证实。活性数据表明该非均相催化剂具有很高的活性，对应于Veratrole向3,4-二甲氧基苯乙酮的高转化率（88％）。该催化剂可以容易地回收和再利用，在三个反应周期内得到相似的转化率，表明其在实验条件下的稳定性。因此，粉煤灰负载的三氟甲磺酸铈是一种新颖而有效的催化剂，并且通过为工业上重要的Friedel-Crafts酰化反应开发具有成本效益的催化剂系统，是大量利用废粉煤灰的有前途的方式。

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  • 来源
    《Fuel》 |2010年第12期|p.3853-3859|共7页
  • 作者

    Chitralekha Khatri; Deepti Jain; Ashu Rani;

  • 作者单位

    Department of Pure and Applied Chemistry, University of Kota, 2-m-1, Rangbari Scheme, Rajasthan 324005, India;

    rnDepartment of Pure and Applied Chemistry, University of Kota, 2-m-1, Rangbari Scheme, Rajasthan 324005, India;

    rnDepartment of Pure and Applied Chemistry, University of Kota, 2-m-1, Rangbari Scheme, Rajasthan 324005, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solid acid; fly ash; cerium triflate; friedel-crafts acylation;

    机译：固体酸粉煤灰三氟甲磺酸铈Friedel-crafts酰化;

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