TY - JOUR
T1 - Effects of surface oxygen-containing groups of the flowerlike carbon nanosheets on palladium dispersion, catalytic activity and stability in hydrogenolytic debenzylation of tetraacetyldibenzylhexaazaisowurtzitane
AU - Chen, Yun
AU - Ding, Xinlei
AU - Qiu, Wenge
AU - Song, Jianwei
AU - Nan, Junping
AU - Bai, Guangmei
AU - Pang, Siping
N1 - Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/4
Y1 - 2021/4
N2 - The influence of the surface chemical properties of the carbon support on the Pd dispersion, activity and stability of Pd(OH)2 /C catalyst for the hydrogenolytic debenzylation of tetraacetyldiben-zylhexaazaisowurtzitane (TADB) was studied in detail. The flowerlike nanosheet carbon material (NSC) was chosen as the pristine support, meanwhile chemical oxidation with nitric acid and physical calcination at 600◦ C treatments were used to modify its surface properties, which were denoted as NSCox-2 (treated with 20 wt% HNO3) and NSC-600, respectively. The three carbon supports and the corresponding catalysts of Pd/NSC, Pd/NSC-600, and Pd/NSCox-2 were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), nitrogen sorption isotherm measurement (BET), powder X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectra (XPS), temperature-programmed desorption (TPD), temperature-programmed reduction (H2-TPR), thermogravimetric analysis (TG), and element analysis. The debenzylation activities of Pd/NSC, Pd/NSC-600, and Pd/NSCox-2, as well as the three catalysts after pre-reduction treatment were also evaluated. It was found that the activity and stability of the Pd(OH)2 /C catalysts in the debenzylation reaction highly depended on the content of surface oxygen-containing groups of the carbon support.
AB - The influence of the surface chemical properties of the carbon support on the Pd dispersion, activity and stability of Pd(OH)2 /C catalyst for the hydrogenolytic debenzylation of tetraacetyldiben-zylhexaazaisowurtzitane (TADB) was studied in detail. The flowerlike nanosheet carbon material (NSC) was chosen as the pristine support, meanwhile chemical oxidation with nitric acid and physical calcination at 600◦ C treatments were used to modify its surface properties, which were denoted as NSCox-2 (treated with 20 wt% HNO3) and NSC-600, respectively. The three carbon supports and the corresponding catalysts of Pd/NSC, Pd/NSC-600, and Pd/NSCox-2 were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), nitrogen sorption isotherm measurement (BET), powder X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectra (XPS), temperature-programmed desorption (TPD), temperature-programmed reduction (H2-TPR), thermogravimetric analysis (TG), and element analysis. The debenzylation activities of Pd/NSC, Pd/NSC-600, and Pd/NSCox-2, as well as the three catalysts after pre-reduction treatment were also evaluated. It was found that the activity and stability of the Pd(OH)2 /C catalysts in the debenzylation reaction highly depended on the content of surface oxygen-containing groups of the carbon support.
KW - Hydrogenolytic debenzylation
KW - Palladium catalyst
KW - Palladium dispersion
KW - Surface oxygen-containing groups
UR - https://www.scopus.com/pages/publications/85103270095
U2 - 10.3390/catal11040441
DO - 10.3390/catal11040441
M3 - Article
AN - SCOPUS:85103270095
SN - 2073-4344
VL - 11
JO - Catalysts
JF - Catalysts
IS - 4
M1 - 441
ER -