The platinum catalyst (2.0 mg, 0.67% w/w) or the HEB catalyst (7.5 mg -2.5% w/w) was ground in a mortar and pestle with 300 mg of WO3. Then, placed in 5 mL of methanol within a 25 mL round bottom flask along with a small magnetic stir bar, equipped with a septum and sealed with parafilm. The flask was then vacuumed and repressurized with hydrogen gas to 1 atm. This purging and pressurizing process was repeated three times. The flask was then placed on a magnetic stir plate set to 800 RPM and agitated for 48-hours while maintaining a hydrogen pressure of 1 atm.