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Title: Converting polyisoprene rubbers into bio-jet fuels via a cascade hydropyrolysis and vapor-phase hydrogenation process

Journal Article · · Energy Conversion and Management
 [1];  [1];  [2];  [3];  [4]; ORCiD logo [5];  [6];  [6]
  1. Nanjing Forestry Univ. (China); Chinese Academy of Forestry (CAF), Nanjing (China)
  2. Nanjing Forestry Univ. (China)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Chinese Academy of Forestry (CAF), Nanjing (China)
  5. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Hong Kong Polytechnic University (China)

Producing alternative drop-in bio-jet fuels from biomass provides a promising approach to achieve carbon neutrality. Here, to upcycle biomass-based polyisoprene rubbers into jet-fuel range C10 cycloalkane, we proposed a cascade hydropyrolysis and vapor-phase hydrogenation process in a flow-through two-stage pressurized fixed-bed reactor. The hydropyrolysis temperature in the first stage is of vital importance for the formation of primary limonene intermediate in the non-catalytic degradation of polyisoprene rubbers, and a reaction temperature of 460 °C maximized limonene yield to 588.6 mg/g for natural rubber and 546.2 mg/g for Eucommia rubber. Over a Pt/C catalyst loaded in the second stage, the limonene intermediate produced from the first-stage reactor can be completely hydrogenated, giving a 642.7 mg/g yield of jet-fuel range C10 cycloalkane with 83.6% selectivity. The depolymerization mechanism of polyisoprene rubbers was thoroughly studied, and a competitive reaction between limonene hydrogenation and limonene dehydrogenation was observed. This is the first report on producing C10 cycloalkane from natural rubbers via a cascade hydropyrolysis and hydrogenation process, providing a promising strategy to upcycle polyisoprene rubbers into bio-jet fuels.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; Natural Science Foundation of Jiangsu Province; National Natural Science Foundation of China (NSFC); China Postdoctoral Science Foundation; Hong Kong Research Grants Council
Grant/Contract Number:
AC05-00OR22725; BK2020789; 52006106; 2020TQ0154; PolyU 15222020
OSTI ID:
1891386
Journal Information:
Energy Conversion and Management, Vol. 270, Issue 1; ISSN 0196-8904
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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