Catalysts for reduction of tetrahydrofuran-2-carboxylic acid (THFCA), which can be synthesized from furfural via oxidation and hydrogenation, were explored among the combinations of noble metal and reducible metal oxide supported on SiO₂. Rh-WO_x/SiO₂ catalysts showed activity in C-O hydrogenolysis at 2-position of THFCA (to δ-valerolactone and 5-hydroxyvaleric acid) and higher yield ratio of these C-O hydrogenolysis products to carboxylic acid hydrogenation products than other bimetallic catalysts. The activity of Rh-WO_x/SiO₂ catalysts was highest at W/Rh = 0.25 mol/mol. XRD, TPR, CO adsorption and XAFS characterizations showed that the Rh-WO_x/SiO₂ (W/Rh = 0.25) catalyst contained Rh metal particles with surface modification with isolated W²⁺ oxide species. The mechanism that hydride-like species formed on Rh atom attacks the C atom at the α-position (2-position) of adsorbed carboxylate on W atom is proposed based on the similar kinetics and similar catalyst structure to Rh-MO_x/SiO₂ (M = Re, Mo) which is known to be active in THFA hydrogenolysis to 1,5-pentanediol.

在负载于SiO ₂的贵金属和可还原金属氧化物的组合中，探索了可通过糠醛的氧化和氢化反应合成四氢呋喃-2-羧酸（THFCA）的催化剂。Rh-WO _x / SiO ₂催化剂在THFCA的2位（对δ-戊内酯和5-羟基戊酸）的CO氢解中显示出活性，并且这些CO氢解产物与羧酸加氢产物的产率比其他双金属催化剂高。Rh-WO _x / SiO ₂催化剂的活性在W / Rh = 0.25 mol / mol时最高。XRD，TPR，CO吸附和XAFS表征表明Rh-WO _x / SiO ₂（W / Rh = 0.25）催化剂含有经分离的W ²⁺氧化物进行表面改性的Rh金属粒子。基于与Rh-MO _x / SiO ₂相似的动力学和相似的催化剂结构，提出了Rh原子上形成的氢化物样物种攻击W原子上吸附的羧酸盐的α-位（2-位）上的C原子的机理。（M ＝ Re，Mo），已知其在THFA氢解为1，5-戊二醇中具有活性。