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首页> 外文期刊>Catalysis science & technology >Towards biolubricant compatible vegetable oils by pore mouth hydrogenation with shape-selective Pt/ZSM-5 catalysts
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Towards biolubricant compatible vegetable oils by pore mouth hydrogenation with shape-selective Pt/ZSM-5 catalysts

机译：对biolubricant兼容的植物油孔隙和择形嘴加氢Pt / ZSM-5催化剂

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摘要

Pt/ZSM-5 catalysts with various crystal sizes were prepared via competitive ion-exchange, followed by a slow activation procedure. Even when using very large ZSM-5 crystals, highly dispersed Pt nano-clusters were contained within the zeolite crystal's voids, as ascertained by 2D pressure-jump IR spectroscopy of adsorbed CO and focussed ion-beam transmission electron microscopy. The shape-selective properties of the Pt/ZSM-5 catalysts were evaluated in the partial hydrogenation of soybean oil. Unique hydrogenation selectivities were observed, as the fatty acids located at the central position of the triacylglycerol (TAG) molecules were preferentially hydrogenated. The resulting oil has therefore high levels of intermediately melting TAGs, which are compatible with biolubricants due to their improved oxidative stability and still appropriate low-temperature fluidity. The TAG distribution in the partially hydrogenated soybean oil samples was independent from the zeolite crystal size, while the hydrogenation activity linearly increases with the crystal's external surface area. This trend was confirmed with a Pt loaded mesoporous ZSM-5 zeolite, obtained via a mild alkaline treatment. These observations imply and confirm a genuine pore mouth catalysis mechanism, in which only one fatty acid chain of the TAG is able to enter the micropores of ZSM-5, where the double bonds are hydrogenated by the crystal encapsulated Pt-clusters.
机译：Pt / ZSM-5催化剂与各种水晶大小准备通过竞争离子交换,紧随其后通过缓慢激活过程。非常大的ZSM-5晶体,高度分散的Ptnano-clusters被包含在沸石水晶的空洞,所确定的2 d气压的突然升高吸附CO的红外光谱集中离子束透射电子显微镜。Pt / ZSM-5催化剂部分进行评估氢化大豆油。加氢选择性观察的脂肪酸位于中央的位置三酰甘油(标签)的分子优先氢化。因此,高水平的在中间融化的标签,兼容biolubricants由于其改善氧化仍然稳定和适当的低温流动性。氢化大豆油样本是独立的从沸石晶粒大小,而加氢活性线性增加水晶的外部表面。证实了Pt加载介孔ZSM-5吗通过轻微的碱性沸石,获得治疗。这些观察暗示并确认真正的毛孔口催化机制,只有一个脂肪酸链的标签能够进入ZSM-5微孔隙,双键氢化的水晶封装Pt-clusters。

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