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首页> 外文期刊>RSC Advances >Low temperature hydrodeoxygenation of guaiacol into cyclohexane over Ni/SiO2 catalyst combined with Hβ zeolite
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Low temperature hydrodeoxygenation of guaiacol into cyclohexane over Ni/SiO2 catalyst combined with Hβ zeolite

机译：Ni / SiO2催化剂与Hβ沸石结合对愈创木酚进行低温加氢脱氧成环己烷

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摘要

Hydrodeoxygenation (HDO) of guaiacol to cyclohexane, important for bio-oil upgrading, is usually performed at high reaction temperature (≥200 °C). In this work, low temperature transformation of guaiacol to cyclohexane was achieved at 140 °C over non-noble metal Ni/SiO _(2) and various zeolites. Among zeolites tested (HUSY, HMOR, Hβ, HZSM-5, SAPO-34), Hβ zeolite exhibited superior catalytic activity due to its appropriate pore structure and acid strength. The open pore with three-dimensional structure of Hβ facilitates the diffusion of guaiacol and intermediates. Meanwhile, weak acid strength of Hβ efficiently reduces the competitive adsorption of guaiacol, and then promotes the dehydration of intermediate 2-methoxycyclohexanol. Moreover, the catalytic performance in guaiacol HDO to cyclohexane is also closely related to Si/Al ratio of Hβ. Owing to its moderate acid density, the maximum yield of cyclohexane reaches 91.7% on Hβ(Si/Al = 50) combined with Ni/SiO _(2) at 140 °C, which is the lowest temperature ever reported over non-noble metal catalysts.
机译：愈创木酚加氢成环己烷的加氢脱氧（HDO）对生物油的提质至关重要，通常在较高的反应温度（≥200°C）下进行。在这项工作中，在非贵金属Ni / SiO_（2）和各种沸石上，愈创木酚在140°C的低温下转化为环己烷。在所测试的沸石（HUSY，HMOR，Hβ，HZSM-5，SAPO-34）中，Hβ沸石由于其适当的孔结构和酸强度而显示出优异的催化活性。 Hβ具有三维结构的开孔促进愈创木酚和中间体的扩散。同时，Hβ的弱酸强度有效降低了愈创木酚的竞争性吸附，进而促进了中间体2-甲氧基环己醇的脱水。此外，愈创木酚HDO对环己烷的催化性能也与Hβ的Si / Al比密切相关。由于其中等的酸密度，在140°C时Hβ（Si / Al = 50）与Ni / SiO _（2）结合时，环己烷的最大收率达到91.7％，这是有史以来最低的非贵金属温度催化剂。

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