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首页> 外文期刊>Catalysis science & technology >Synthesis of highly active carbon-encapsulated Ni2P catalysts by one-step pyrolysis–phosphidation for hydrodeoxygenation of phenolic compounds
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Synthesis of highly active carbon-encapsulated Ni2P catalysts by one-step pyrolysis–phosphidation for hydrodeoxygenation of phenolic compounds

机译：通过一步热解 - 磷酸合成高度活性的碳封装的Ni2p催化剂

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摘要

Hydrodeoxygenation (HDO) of phenolic compounds is a promising technology to convert biomass materials to value-added chemicals and fuels. However, the development of highly efficient catalysts remains a great challenge. In this work, a facile one-step pyrolysis–phosphidation strategy for the synthesis of carbon-encapsulated nanostructured Ni2P@C(x) catalysts (x is the initial mass ratio of NaH2PO2 to Ni-MOF-74) under a N2 atmosphere from a metal–organic framework (Ni-MOF-74) was proposed and the prepared catalysts were used for HDO of phenol. The effects of different values of x and reaction conditions on the phenol HDO performance as well as product distribution were investigated. The results showed that as compared to the Ni@C catalyst (4.2%), the de-oxygenated product selectivity was enhanced 22.8 times by the introduction of the P species due to the promoted dehydration of cyclohexanol over Ni2P@C(x) catalysts. Ni2P@C(3) exhibited the best catalytic performance at the temperature of 250 °C, pressure of 2 MPa, and reaction time of 2 h; the conversion of phenol was 100%, and the total yield of deoxygenated products reached 100%. The HDO of phenol over the Ni2P@C(x) catalyst mainly proceeded via the HYD pathway (hydrogenation of the aromatic ring to cyclohexanol, and dehydration of cyclohexanol to give rise to cyclohexene followed by hydrogenation to cyclohexane).
机译：酚类化合物的加氢氧合（HDO）是一种将生物量材料转换为增值化学物质和燃料的有前途的技术。但是，高效催化剂的发展仍然是一个巨大的挑战。在这项工作中，一种简单的一步热解 - 磷化策略，用于合成碳封装的纳米结构的Ni2p@c（x）催化剂（x是nah2po2与ni-mof-74的初始质量比）提出了金属 - 有机框架（Ni-Mof-74），并将制备的催化剂用于HDO苯酚。研究了X和反应条件不同值对苯酚HDO性能以及产品分布的影响。结果表明，与Ni@C催化剂（4.2％）相比，由于促进了Cyclohexanol在Ni2p@c（x）催化剂上脱水而引入P物种，脱氧产品的选择性提高了22.8倍。 Ni2p@C（3）在250°C的温度，2 MPa的压力和2小时的反应时间时表现出最佳的催化性能;苯酚的转化率为100％，脱氧产物的总产率达到100％。 Ni2p@C（X）催化剂上的苯酚的HDO主要通过HYD途径（将芳环与环己醇的氢化和环己醇的脱水产生，从而导致环己烯，然后再氢化为环己烷）。

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