Chlorine-Modified Ru/TiO2 Catalyst for Selective Guaiacol Hydrodeoxygenation,ACS Sustainable Chemistry & Engineering

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Chlorine-Modified Ru/TiO2 Catalyst for Selective Guaiacol Hydrodeoxygenation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-02-15 , DOI: 10.1021/acssuschemeng.0c07292
Xinchao Wang _{1,

2,

3} , Peixuan Wu _{1,

2,

3} , Zhuangqing Wang _{1,

2,

3} , Leilei Zhou _{1,

2,

3} , Yanchun Liu _{1,

3,

4} , Haiyang Cheng _{1,

3} , Masahiko Arai _{1,

3} , Chao Zhang _{1,

2,

3} , Fengyu Zhao _{1,

3}

Affiliation

The selective hydrodeoxygenation of lignin-derived guaiacol to value-added products, especially phenol, under relatively mild reaction conditions remains an important challenge. A Cl-modified Ru/TiO₂ catalyst exhibited higher phenol selectivity compared with an unmodified one in the conversion of guaiacol in 1,4-dioxane at 240 °C and 1 MPa H₂. Unlike Ru/TiO₂, the modified catalyst exhibited a modest activity of demethoxylation producing phenol but an inferior ability of hydrogenation of its aromatic ring, resulting in much slower consumption of phenol. The Cl species were likely localized at the metal–support interface and on the surface of metal particles, and these modified both Ru and Ti species electronically. It is presumed that electron-enriched Ru inhibits the ring hydrogenation reaction, and the defects on the TiO₂ surface promote the deoxygenation reaction.

中文翻译：

氯改性的Ru / TiO ₂催化剂对愈创木酚的选择性加氢脱氧作用

在相对温和的反应条件下，将木质素衍生的愈创木酚选择性加氢脱氧成增值产品，尤其是苯酚，仍然是一个重要的挑战。与未改性的催化剂相比，在240°C和1 MPa H _2的条件下，愈创木酚在1,4-二恶烷中的转化率，与未改性的Ru / TiO ₂催化剂相比，Cl-改性的Ru / TiO ₂催化剂具有更高的苯酚选择性。与Ru / TiO ₂不同，改性催化剂表现出适度的脱甲氧基化作用产生苯酚，但其芳环的氢化能力较差，导致苯酚的消耗慢得多。Cl物种可能位于金属-载体界面以及金属粒子的表面，并且通过电子方式修饰了Ru和Ti物种。据推测，富电子的Ru抑制了环氢化反应，并且TiO ₂表面上的缺陷促进了脱氧反应。

更新日期：2021-03-01

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