PMID- 30769785
OWN - NLM
STAT- MEDLINE
DCOM- 20190531
LR  - 20200225
IS  - 1420-3049 (Electronic)
IS  - 1420-3049 (Linking)
VI  - 24
IP  - 4
DP  - 2019 Feb 14
TI  - Catalytic Performance of Nitrogen-Doped Activated Carbon Supported Pd Catalyst 
      for Hydrodechlorination of 2,4-Dichlorophenol or Chloropentafluoroethane.
LID - 10.3390/molecules24040674 [doi]
LID - 674
AB  - Nitrogen-doped activated carbon (N-AC) obtained through the thermal treatment of 
      a mixture of HNO(3)-pretreated activated carbon (AC) and urea under N(2) atmosphere 
      at 600  degrees C was used as the carrier of Pd catalyst for both liquid-phase 
      hydrodechlorination of 2,4-dichlorophenol (2,4-DCP) and gas-phase 
      hydrodechlorination of chloropentafluoroethane (R-115). The effects of nitrogen 
      doping on the dispersion and stability of Pd, atomic ratio of Pd/Pd(2+) on the 
      surface of the catalyzer, the catalyst's hydrodechlorination activity, as well as 
      the stability of N species in two different reaction systems were investigated. 
      Our results suggest that, despite no improvement in the dispersion of Pd, 
      nitrogen doping may significantly raise the atomic ratio of Pd/Pd(2+) on the 
      catalyst surface, with a value of 1.2 on Pd/AC but 2.2 on Pd/N-AC. Three types of 
      N species, namely graphitic, pyridinic, and pyrrolic nitrogen, were observed on 
      the surface of Pd/N-AC, and graphitic nitrogen was stable in both liquid-phase 
      hydrodechlorination of 2,4-DCP and gas-phase hydrodechlorination of R-115, with 
      pyridinic and pyrrolic nitrogen being unstable during gas-phase 
      hydrodechlorination of R-115. As a result, the average size of Pd nanocrystals on 
      Pd/N-AC was almost kept unchanged after liquid-phase hydrodechlorination of 
      2,4-DCP, whereas crystal growth of Pd was clearly observed on Pd/N-AC after 
      gas-phase hydrodechlorination of R-115. The activity test revealed that Pd/N-AC 
      exhibited a much better performance than Pd/AC in liquid-phase 
      hydrodechlorination of 2,4-DCP, probably due to the enhanced stability of Pd 
      exposed to the environment resulting from nitrogen doping as suggested by the 
      higher atomic ratio of Pd/Pd(2+) on the catalyst surface. In the gas-phase 
      hydrodechlorination of R-115, however, a more rapid deactivation phenomenon 
      occurred on Pd/N-AC than on Pd/AC despite a higher activity initially observed on 
      Pd/N-AC, hinting that the stability of pyridinic and pyrrolic nitrogen plays an 
      important role in the determination of catalytic performance of Pd/N-AC.
FAU - Tang, Haodong
AU  - Tang H
AD  - Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang 
      University of Technology, Hangzhou 300014, China. tanghd@zjut.edu.cn.
FAU - Xu, Bin
AU  - Xu B
AD  - Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang 
      University of Technology, Hangzhou 300014, China. 2111601033@zjut.edu.cn.
FAU - Xiang, Meng
AU  - Xiang M
AD  - Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang 
      University of Technology, Hangzhou 300014, China. 2111601241@zjut.edu.cn.
FAU - Chen, Xinxin
AU  - Chen X
AD  - Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang 
      University of Technology, Hangzhou 300014, China. 2111701032@zjut.edu.cn.
FAU - Wang, Yao
AU  - Wang Y
AD  - Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang 
      University of Technology, Hangzhou 300014, China. 2111801033@zjut.edu.cn.
FAU - Liu, Zongjian
AU  - Liu Z
AD  - Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang 
      University of Technology, Hangzhou 300014, China. zjliu@zjut.edu.cn.
LA  - eng
GR  - 21776257/National Natural Science Foundation of China/
PT  - Journal Article
DEP - 20190214
PL  - Switzerland
TA  - Molecules
JT  - Molecules (Basel, Switzerland)
JID - 100964009
RN  - 0 (Chlorofluorocarbons, Methane)
RN  - 0 (Chlorophenols)
RN  - 16291-96-6 (Charcoal)
RN  - 5TWQ1V240M (Palladium)
RN  - 7440-44-0 (Carbon)
RN  - 8W8T17847W (Urea)
RN  - N762921K75 (Nitrogen)
RN  - R669TG1950 (2,4-dichlorophenol)
RN  - SJG47X19V4 (chloropentafluoroethane)
SB  - IM
MH  - Carbon/*chemistry
MH  - Catalysis
MH  - Charcoal/chemistry
MH  - Chlorofluorocarbons, Methane/*chemistry
MH  - Chlorophenols/*chemistry
MH  - Nitrogen/*chemistry
MH  - Palladium/chemistry
MH  - Urea/chemistry
PMC - PMC6413172
OTO - NOTNLM
OT  - Pd
OT  - activated carbon
OT  - hydrodechlorination
OT  - nitrogen doping
COIS- The authors declare no conflict of interest.
EDAT- 2019/02/17 06:00
MHDA- 2019/06/01 06:00
PMCR- 2019/02/14
CRDT- 2019/02/17 06:00
PHST- 2018/12/25 00:00 [received]
PHST- 2019/01/24 00:00 [revised]
PHST- 2019/02/12 00:00 [accepted]
PHST- 2019/02/17 06:00 [entrez]
PHST- 2019/02/17 06:00 [pubmed]
PHST- 2019/06/01 06:00 [medline]
PHST- 2019/02/14 00:00 [pmc-release]
AID - molecules24040674 [pii]
AID - molecules-24-00674 [pii]
AID - 10.3390/molecules24040674 [doi]
PST - epublish
SO  - Molecules. 2019 Feb 14;24(4):674. doi: 10.3390/molecules24040674.