Organic–inorganic hybrid porous sulfonated zinc phosphonate material: efficient catalyst for biodiesel synthesis at room temperature
Organic–inorganic hybrid porous sulfonated zinc phosphonate material: efficient catalyst for biodiesel synthesis at room temperature
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DOI：
10.1039/c2gc35225g
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发表时间：
2012-08
期刊：
影响因子：
9.8
通讯作者：
M. Pramanik;Mahasweta Nandi;H. Uyama;A. Bhaumik
中科院分区：
文献类型：
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作者：
M. Pramanik;Mahasweta Nandi;H. Uyama;A. Bhaumik
以对二甲苯二膦酸和无水ZnCl 2为原料，在水热和弱酸性条件下（pH = 5），在无任何结构导向剂存在下合成了一种新型多孔膦酸锌材料（HZnP-1）。该材料的苯基已经用浓硫酸磺化以获得磺酸官能化材料HZnPS-1。采用粉末X射线衍射（XRD）、场发射扫描电子显微镜（FE SEM）、N2吸附、固态13 C CP MAS和31 P MAS NMR以及FT IR光谱工具对这些材料进行表征。两种材料的晶体结构对应于新的正交相进行索引，其中HZnP-1的晶胞参数为a = 11.00，B = 8.74，c = 14.62 A，α = β = γ = 90°，而HZnPS-1的晶胞参数为a = 10.65，B = 13.52，c = 15.30 A，α = β = γ = 90°。HZnPS-1在以甲醇为反应物和溶剂的长链脂肪酸酯化反应中表现出优异的催化活性和较高的循环利用率。本文所述的绿色和生态友好的催化体系可以克服生物柴油合成中已知的现有催化体系所面临的问题，例如剧烈条件（高反应温度）和需要有害有机溶剂。
A new porous zinc phosphonate material (HZnP-1) has been synthesized via the reaction between p-xylenediphosphonic acid and anhydrous ZnCl2 under hydrothermal and mildly acidic conditions (pH ∼ 5) in the absence of any structure directing agent. The phenyl group of this material has been sulfonated with concentrated sulfuric acid to obtain sulfonic acid functionalized material HZnPS-1. Powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE SEM), N2 sorption, solid state 13C CP MAS and 31P MAS NMR, and FT IR spectroscopic tools are employed to characterize these materials. The crystal structures of both the materials are indexed corresponding to the new orthorhombic phases with unit cell parameters a = 11.00, b = 8.74, c = 14.62 A, α = β = γ = 90° for HZnP-1, and a = 10.65, b = 13.52, c = 15.30 A and α = β = γ = 90° for HZnPS-1. HZnPS-1 showed outstanding catalytic activity and high recycling efficiency for the synthesis of different biodiesel compounds via esterification of long chain fatty acids by using methanol as both reactant and solvent at room temperature. The green and eco-friendly catalytic system described herein can overcome the problem faced by the existing catalytic systems known in biodiesel synthesis, such as drastic conditions (high reaction temperature) and requirement of hazardous organic solvents.