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CO2-Assisted propane aromatization over phosphorus-modified Ga/ZSM-5 catalysts

Journal Article · · Catalysis Science and Technology
DOI:https://doi.org/10.1039/C9CY02589H· OSTI ID:1618400
 [1];  [2];  [3];  [4]
  1. Harbin Inst. of Technology (China); Columbia Univ., New York, NY (United States)
  2. Columbia Univ., New York, NY (United States); Dalian Univ. of Technology (China)
  3. Harbin Inst. of Technology (China)
  4. Columbia Univ., New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Modification of HZSM-5 with phosphorus (P) and gallium (Ga) was found to enhance the activity of CO2-assisted oxidative dehydrogenation and aromatization (CO2-ODA) of propane to liquid aromatics. Flow reactor studies measuring the simultaneous CO2 reduction and the CO2-ODA of propane were performed at 873 K at atmospheric pressure over unmodified HZSM-5 and P/Ga/ZSM-5 catalysts. At comparable propane conversion, HZSM-5 showed a high selectivity toward the undesired methane product (41.4%) with a relatively low selectivity toward aromatics (16.5%). In comparison, P/Ga/ZSM-5 demonstrated a significantly higher aromatics selectivity (42.3%) with a simultaneous reduction in methane selectivity (13.5%). Density functional theory (DFT) calculations identified the mechanisms for propane dehydrogenation and aromatization over P/Ga/ZSM-5 and the role of CO2. Finally cooperative with P, CO2 addition avoided the formation of molecular H2 and reduced the barriers for benzene formation, leading to an enhanced activity and selectivity to aromatics from CO2-ODA of propane over P/Ga/ZSM-5.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Key Research and Development Program of China; Fundamental Research Funds for the Central Universities
Grant/Contract Number:
SC0012704
OSTI ID:
1618400
Alternate ID(s):
OSTI ID: 1601510
Report Number(s):
BNL--215930-2020-JAAM
Journal Information:
Catalysis Science and Technology, Journal Name: Catalysis Science and Technology Journal Issue: 6 Vol. 10; ISSN CSTAGD; ISSN 2044-4753
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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