27 / 45
Page 63
Notes:
conferenceseries
.com
Volume 8, Issue 2 (Suppl)
Chem Sci J 2017
ISSN: 2150-3494 CSJ, an open access journal
Euro Chemistry 2017
May 11-13, 2017
May 11-13, 2017 Barcelona, Spain
4
th
European Chemistry Congress
CNFs-supported Pd series catalysts comparison for hydrogen evolution from additive free formic acid
decomposition
Felipe Sánchez
1
, Alberto Villa
2
and
Nikolaos Dimitratos
1
1
Cardiff University, UK
2
University of Milan, Italy
S
earching for a safe and efficient H
2
generation/storage material has become a serious challenge toward a fuel-cell-based H
2
economy
as a long-term solution. Herein we report the development of Pd nanoparticles catalysts supported on 5 different carbon nanofibers
(CNFs): three different grades and nitrogen and oxygen functionalisations; each one via sol-immobilisation and impregnation
techniques. Thorough characterisation has been carried out by XRD, XPS, TEM, SEM-EDX. The catalysts have been evaluated for
the formic acid dehydrogenation, which has potential to be a safe and convenient H2 carrier under mild conditions.
Those
catalysts prepared by sol-immobilisation technique exhibit more activity when compared with catalysts prepared by impregnation
due to the higher metal loading and higher Pd0/Pd ratio, smaller particle size (Fig. 1) and lower binding energies, leading to an
improved activity due to the weaker interaction between the Pd nanoparticles and the formic acid. The heat treatment on CNFs has
an important effect on catalyst activity, increasing with the annealing temperature (Fig. 2). Oxygen functionalities present a higher
initial activity that could be addressed to a favoured deprotonation step due to the presence of O- on the surface, leading to an easier
dehydrogenation of formic acid. However, deactivation was observed after 30 minutes due to CO evolution. The most active catalyst
reached a remarkable TOF of 979 h-1 and high selectivity (>99%) at 30°C. Being this a great value for formic acid dehydrogenation
at mild conditions however, further investigation is necessary in order to decrease the CO formation and improve reusability.
Biography
Felipe Sánchez is from department of chemical engineering in Málaga. Currently, he joined in Cardiff University for PhD and pursuing 3
rd
year.
SanchezF@cardiff.ac.ukFelipe Sánchez et al., Chem Sci J 2017, 8:2(Suppl)
http://dx.doi.org/10.4172/2150-3494-C1-008