Tailoring product distribution during upgrading of palmitic acid over bi-functional metal/zeolite catalysts
Tailoring product distribution during upgrading of palmitic acid over bi-functional metal/zeolite catalysts
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在双功能金属/沸石催化剂上调整棕榈酸升级过程中的产品分布
DOI：
10.1016/j.ces.2017.03.052
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发表时间：
2017
影响因子：
4.7
通讯作者：
Wu Yulong
中科院分区：
文献类型：
--
作者：
Shi Yanchun;Xing Enhui;Cao Yaya;Liu Mingjuan;Wu Kejing;Yang Mingde;Wu Yulong
设计了双功能金属（Ni和Co）/分子筛催化剂用于棕榈酸的改质。在不含金属相的H-ZSM-5载体上没有发现异构化产物，但发现了加氢脱氧（次要途径）、加氢脱羰（主要途径）和直接裂解。一方面，Ni或Co物种的浸渍，增强了加氢脱氧通过水合-氢化途径和减少加氢脱羰基途径。另一方面，金属相的引入降低了异构化温度，这与双功能催化剂整体的酸强度增强相一致，尤其是Co/沸石催化剂。在Ni/H-ZSM-5和Co/H-ZSM-5双功能催化剂上，棕榈酸的脱氧、加氢产物的异构化和裂化反应同时进行，生成更多的C16和二硫代产物。此外，介孔的引入明显促进了Co基催化剂的二异产物和C16的生成。
Bi-functional metal (Ni and Co)/zeolite catalysts were designed to upgrade palmitic acid. No isomerization products were observed over parent zeolitic supports H-ZSM-5 without metal phase, but hydrodeoxygenation (minor route), hydrodecarbonylation (major route) and the direct cracking were observed. On one hand, the impregnation of Ni or Co species, enhanced hydrodeoxygenation via hydration-hygenation route and decreased hydrodecarbonylation route. On the other hand, metal phase decreased the isomerization temperature, which is consistent with enhanced the acidic strength of whole bi-functional catalysts especially for Co/zeolite catalysts. Simultaneous deoxygenation of palmitic acid, isomerization of hydrogenated products and cracking were achieved over bi-functional Ni/H-ZSM-5 and Co/H-ZSM-5 catalysts, with more C16andiso-products formation. Furthermore, the introduction of mesopores obviously enhancediso-products and C16formation for Co-based catalysts.