fig4

Figure 4. (A) Pt₂/LaO_V-r catalyzed poisoning experiments for EL hydrogenation; (B) CO₂-TPD curves of LaO_V-r, Pt₂/LaQS and Pt₂/LaO_V-r; (C) NH₃-TPD curves of LaO_V-r, Pt₂/LaQS and Pt₂/LaO_V-r; (D-F) EL adsorbed on O_V and Pt sites on Pt₂/LaO_V-r, Pt sites on Pt₂/LaQS. EL: Ethyl levulinate; TPD: temperature-programmed desorption.