Enhanced Base-Free Formic Acid Production from CO2 on Pd/g-C3 N4 by Tuning of the Carrier Defects

ChemSusChem
Cecilia MondelliJavier Pérez-Ramírez

Abstract

CO2 hydrogenation is attracting increasing attention as a sustainable route to produce formic acid, a commodity and potential energy vector. Here, bifunctional catalysts comprising metal nanoparticles deposited on bulk graphitic carbon nitride were assessed under base-free conditions, identifying supported Pd as the best performer. The catalyst productivity was enhanced by maximizing the edge-defects of the g-C3 N4 carrier, amino groups able to activate CO2 , and by generating welldispersed 5 nm Pd particles, required to split H2 . Bottom-up synthesis methods, that is, hard-templating and carbon enrichment upon polymerization, and top-down strategies, that is, thermal exfoliation of the as-prepared solid, were explored to boost the defects, the nature and density of which were evaluated by thermal and (in situ) spectroscopic techniques. After optimization of temperature, pressure, and reaction time, a 20 times higher turnover frequency compared with the best Pd/g-C3 N4 catalyst reported producing formic acid from CO2 without base was attained. This activity level was retained upon recycling with intermediate catalyst regeneration at mild temperature.

References

Mar 3, 2007·Angewandte Chemie·Frédéric GoettmannMarkus Antonietti
Sep 25, 2009·Journal of the American Chemical Society·Ryo TanakaKyoko Nozaki
Feb 20, 2010·The Journal of Physical Chemistry. a·Yoshiro YasakaMasaru Nakahara
Nov 8, 2011·Angewandte Chemie·Debora PretiGiuseppe Fachinetti
Jul 23, 2013·Journal of the American Chemical Society·Matthew S JeleticJohn C Linehan
Aug 1, 2015·Angewandte Chemie·Gianvito ViléJavier Pérez-Ramírez
Feb 19, 2016·Physical Chemistry Chemical Physics : PCCP·Cornel FinkGabor Laurenczy

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