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An Efficient Acetalization Method for Biomass‐Derived Furfural with Ethanol Using γ‐Al2O3‐Supported Catalysts
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-03-19 , DOI: 10.1002/slct.202000410 Nahury Castellanos‐Blanco 1 , Gonzalo Taborda 2 , Martha Cobo 3
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-03-19 , DOI: 10.1002/slct.202000410 Nahury Castellanos‐Blanco 1 , Gonzalo Taborda 2 , Martha Cobo 3
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In this paper, the mono and bimetallic catalysts of Rh, Pt and Ni supported on γ‐Al2O3 were tested for the selective acetalization of furfural to produce furfural diethyl acetal in a mixture containing furfural diluted in ethanol. Ni1.5Rh1.5/γ‐Al2O3 exhibited the highest catalytic activity among all the tested catalysts, with an 85% furfural conversion and 100% furfural diethyl acetal selectivity at 100 °C and 30 min of reaction. Catalyst characterization showed that Ni1.5Rh1.5/γ‐Al2O3 presented particle sizes smaller than 1.2 nm, and the active metals were partially oxidized (RhIII and NiII). A direct correlation between conversion and weak acidity of mono and bimetallic catalysts was obtained. Interestingly, despite exhibiting strong acidity, γ‐Al2O3 alone was little active in the process, which evidenced the role of the metal in acetalization of furfural into ethanol. In‐situ DRIFTS experiments indicated that furfural is easily adsorbed onto these small particles as Niδ+‐(η1‐O,C‐FFR) and Rhδ+‐ethoxide species and rapidly transforms into furfural diethyl acetal and water. The catalyst was recycled four times, with a loss in catalytic activity of approximately 19%. The Ni1.5Rh1.5/γ‐Al2O3 catalyst was also successfully applied in the condensation of a variety of biomass derivatives.
中文翻译：
γ-Al2O3负载催化剂对乙醇生物质糠醛的高效催化方法
在本文中，单声道和Rh，Pt和Ni中的双金属催化剂负载在γ-Al系2 ö 3分别为糠醛选择性缩醛化以产生糠醛二乙基缩醛在含有乙醇稀释糠醛的混合物进行测试。倪1.5的Rh 1.5 /γ-Al系2 ö 3显示所有测试的催化剂中的最高的催化活性，使用85％糠醛转化和100％糠醛二乙基缩醛的选择性在100℃和反应30分钟。催化剂的表征表明，镍1.5的Rh 1.5 /γ-Al系2 ö 3呈现颗粒尺寸小于1.2纳米，和活性金属被部分氧化（铑III和Ni II）。获得了单金属和双金属催化剂的转化率与弱酸性之间的直接关系。有趣的是，尽管显示出强酸性，在γ-Al 2 ö 3独自在这个过程中，其证明在糠醛缩醛化的金属的作用为乙醇小活性。原位DRIFTS实验表明糠醛容易吸附到这些小颗粒的Ni δ+ - （η 1 -O，C-FFR）和Rh δ+ -ethoxide物种并迅速转换成糠醛二乙基缩醛和水。催化剂被循环四次，催化活性损失约19％。镍1.5 Rh 1.5/γ-Al系2 ö 3催化剂还成功地在各种生物质衍生物的缩合使用。
更新日期：2020-03-20
中文翻译：
γ-Al2O3负载催化剂对乙醇生物质糠醛的高效催化方法
在本文中，单声道和Rh，Pt和Ni中的双金属催化剂负载在γ-Al系2 ö 3分别为糠醛选择性缩醛化以产生糠醛二乙基缩醛在含有乙醇稀释糠醛的混合物进行测试。倪1.5的Rh 1.5 /γ-Al系2 ö 3显示所有测试的催化剂中的最高的催化活性，使用85％糠醛转化和100％糠醛二乙基缩醛的选择性在100℃和反应30分钟。催化剂的表征表明，镍1.5的Rh 1.5 /γ-Al系2 ö 3呈现颗粒尺寸小于1.2纳米，和活性金属被部分氧化（铑III和Ni II）。获得了单金属和双金属催化剂的转化率与弱酸性之间的直接关系。有趣的是，尽管显示出强酸性，在γ-Al 2 ö 3独自在这个过程中，其证明在糠醛缩醛化的金属的作用为乙醇小活性。原位DRIFTS实验表明糠醛容易吸附到这些小颗粒的Ni δ+ - （η 1 -O，C-FFR）和Rh δ+ -ethoxide物种并迅速转换成糠醛二乙基缩醛和水。催化剂被循环四次，催化活性损失约19％。镍1.5 Rh 1.5/γ-Al系2 ö 3催化剂还成功地在各种生物质衍生物的缩合使用。
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