Enhanced hydrogenation of ethyl levulinate by Pd–AC doped with Nb2O5

Enhanced hydrogenation of ethyl levulinate by Pd–AC doped with Nb2O5
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Nb2O5 掺杂 Pd-AC 强化乙酰丙酸乙酯加氢

DOI:
10.1039/c4gc00972j
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发表时间:
2014-07
期刊:
影响因子:
9.8
通讯作者:
关业军
关业军
中科院分区:
化学1区
文献类型:
--
作者:
damin zhang;teng xue;yimeng wang;关业军

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γ-戊内酯(GVL)是高价值化学品和燃料的可持续原料,已通过乙酰丙酸(LA)或乙酰丙酸乙酯(EL)加氢制备。在这项工作中,负载在Nb 2 O 5掺杂的活性炭(AC)的Pd纳米粒子制备通过湿初浸渍与氯化钯,然后用硼氢化钠还原。分散的氧化铌在催化过程中起着双功能作用:稳定Pd纳米颗粒和充当酸性助催化剂。氧化铌和Pd之间的这种协同效应导致负载型Pd催化剂在EL氢化中具有前所未有的高活性。协同作用与氧化铌负载量和煅烧温度两者相关,其中在500 °C下煅烧的10wt%Nb2O5在温和的反应条件(100 °C和0.5MPa H2)下显示出最佳性能(87%的EL转化率和97%的GVL选择性)。
Gamma-valerolactone (GVL), as sustainable feedstock for high-value chemicals and fuel, has been produced by hydrogenation of levulinic acid (LA) or ethyl levulinate (EL). In this work, Pd nanoparticles supported on Nb2O5-doped activated carbon (AC) were prepared via wet incipient impregnation with PdCl2 followed by reduction with NaBH4. The dispersed niobia plays a bifunctional role in the catalytic process: stabilizing Pd nanoparticles and acting as an acidic co-catalyst. This synergistic effect between niobia and Pd leads to an unprecedented high activity of supported Pd catalysts in EL hydrogenation. The synergy is correlated with both the niobia loading and calcination temperature, with 10 wt% Nb2O5 calcined at 500 °C showing the best performance (EL conversion of 87% and GVL selectivity of 97%) under mild reaction conditions (100 °C and 0.5 MPa H2).
DOI: 10.1002/chin.200006280
发表时间: 2010-06
期刊: ChemInform
影响因子: --
作者:
I. Nowak;M. Ziolek
通讯作者: I. Nowak;M. Ziolek
DOI: 10.1039/c0gc00797h
发表时间: 2011-01-01
期刊: GREEN CHEMISTRY
影响因子: 9.8
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