Abstract
Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X2, where X represents the surface terminations) for the synthesis of Pd/alk-Ti3C2X2. Results show that the alkali treatment leads to the increase of surface area and surface oxygen-containing groups of Ti3C2X2, thereby facilitating the dispersion and stabilization of Pd species on the surface of alk-Ti3C2X2. The Pd/alk-Ti3C2X2 catalyst shows excellent catalytic activity for the hydrodechlorination of 4-chlorophenol and the hydrogenation of 4-nitrophenol in aqueous solution at 25 °C and hydrogen balloon pressure. High initial reaction rates of 216.6 and 126.3 min−1· are observed for the hydrodechlorination of 4-chlorophenol and hydrogenation of 4-nitrophenol, respectively. Most importantly, Pd/alk-Ti3C2X2 exhibits excellent stability and recyclability in both reactions without any promoters. The superior property of Pd/alk-Ti3C2X2 makes it as a potential material for practical applications.
Highlights
Noble metal nanoparticles have been intensively investigated as catalysts for a variety of organic catalytic reactions
As an essential member of the MXenes group, Ti3C2 with its tailorable physicochemical properties and high physical and chemical stability can be synthesized on the large scale by etching the Al layers of Ti3AlC2 in hydrofluoric acid (HF) solution at room temperature
Xie and co-workers found that the Pt/Ti3C2X2 (X represents the surface terminations) catalyst showed better electrocatalytic performance than a commercial Pt/C catalyst in an oxygen reduction reaction [6]
Summary
Noble metal nanoparticles have been intensively investigated as catalysts for a variety of organic catalytic reactions. It is well known that the structure and surface properties of the supports significantly affect the catalytic activity, chemical and environmental stability, and recyclability of the catalysts. Design and facile synthesis of stable, recyclable, and highly active catalysts for the transformation of 4-CP and 4-NP under mild conditions without additive or chemical reducing agent is highly desirable, considering its significant industrial importance. Nanomaterials 2018, 8, 141 for HDC of 4-CP reaction may attribute to the strong interaction between the metal and the support This catalyst showed a very high activity toward the hydrogenation of 4-NP with hydrogen balloon pressure without additional strong reducing agents such as NaBH4, which is a cost-effective and green process. The high catalytic performance and recycling efficiency of the Pd/alk-Ti3C2X2 catalyst make it as a promising bi-functional material in HDC and hydrogenation reactions
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
