Transformation of γ-valerolactone into 1,4-pentanediol and 2-methyltetrahydrofuran over Zn-promoted Cu/Al2O3 catalysts,Catalysis Science & Technology

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Transformation of γ-valerolactone into 1,4-pentanediol and 2-methyltetrahydrofuran over Zn-promoted Cu/Al2O3 catalysts
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-05-29 , DOI: 10.1039/d0cy00801j
Qiang Liu _{1,

2,

3,

4,

5} , Zhenbo Zhao _{4,

5,

6,

7} , Masahiko Arai _{1,

2,

3,

4,

5} , Chao Zhang _{1,

2,

3,

4,

5} , Ke Liu _{1,

2,

3,

4,

5} , Ruhui Shi _{1,

2,

3,

4,

5} , Peixuan Wu _{1,

2,

3,

4,

5} , Zhuangqing Wang _{1,

2,

3,

4,

5} , Weiwei Lin _{1,

2,

3,

4,

5} , Haiyang Cheng _{1,

2,

3,

4,

5} , Fengyu Zhao _{1,

2,

3,

4,

5}

Affiliation

The transformation of γ-valerolactone (GVL) into 1,4-pentanediol (1,4-PDO) and 2-methyltetra-hydrofuran (2-MTHF) in the presence of H₂, one of the useful biomass conversion and utilization processes, was investigated with monometallic Cu/Al₂O₃ and bimetallic ZnCu/Al₂O₃ catalysts. A 10 wt% Cu-loaded monometallic catalyst produced 1,4-PDO and 2-MTHF in comparable quantities at a medium conversion (∼50%). When Zn was added in a range of Zn/Cu molar ratios of up to 2, in contrast, the catalysts yielded 1,4-PDO in a high selectivity of about 97% at low and high conversion levels. In addition, the 1,4-PDO selectivity over the ZnCu/Al₂O₃ catalysts remained almost unchanged during recycled runs. That is, the addition of Zn to Cu/Al₂O₃ switched the product selectivity and improved the catalyst stability and reusability. Furthermore, the physicochemical properties of the catalysts were characterized by several methods including XRD, TEM, TPR, XPS, FTIR of adsorbed pyridine, and so on. On the basis of those results, the relationships between the catalytic performance (activity, selectivity, and reusability) and the catalyst structural features were discussed.

中文翻译：

锌促进的Cu / Al2O3催化剂上γ-戊内酯向1,4-戊二醇和2-甲基四氢呋喃的转化

在H ₂存在下将γ-戊内酯（GVL）转化为1,4-戊二醇（1,4-PDO）和2-甲基四氢呋喃（2-MTHF），这是一种有用的生物质转化和利用方法，用单金属Cu / Al ₂ O ₃和双金属ZnCu / Al ₂ O ₃催化剂进行了研究。10％（重量）的负载铜的单金属催化剂以中等转化率（〜50％）产生了相当数量的1,4-PDO和2-MTHF。相反，当以高达2的Zn / Cu摩尔比的范围添加Zn时，在低和高转化率下，催化剂以约97％的高选择性产生了1，4-PDO。此外，在ZnCu / Al ₂ O _3上的1,4-PDO选择性在循环运行期间，催化剂几乎保持不变。即，将Zn添加到Cu / Al ₂ O _3中改变了产物的选择性并改善了催化剂的稳定性和可重复使用性。此外，通过XRD，TEM，TPR，XPS，吸附吡啶的FTIR等几种方法对催化剂的理化性质进行了表征。基于这些结果，讨论了催化性能（活性，选择性和可重复使用性）与催化剂结构特征之间的关系。

更新日期：2020-07-06

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