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Reductive catalytic fractionation of cotton stalks: catalytic strategy for tuning the selectivity of phenolic monomers

Journal Article · · Biomass Conversion and Biorefinery
 [1];  [2];  [3];  [1];  [1];  [1]
  1. CSIR-Indian Institute of Petroleum (CSIR-IIP), Dehradun (India); CSIR-Human Resource Development Centre, (CSIR-HRDC), New Delhi (India). Academy of Scientific and Innovative Research (AcSIR)
  2. CSIR-Indian Institute of Petroleum (CSIR-IIP), Dehradun (India)
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Pretreatment of lignocellulosic biomass is a primary step to delink lignin from the lignin-carbohydrate complex for bioethanol production and other value-added products. Presently, these processes yield lignin (technical) with significant structural changes compared to native lignin and make it difficult to valorize. Reductive catalytic fractionation (RCF) is an advanced pretreatment process to valorize native lignin to selective phenolic monomers before capitalizing on carbohydrates. Herein, cotton stalks (CS) were pretreated with ethanol: water mixture catalyzed by bimetallic, Ru-Ni/HY (RNY) and Ru-Fe/HY (RFY), and trimetallic, Ru-Fe-Ni/HY (RFNY), catalysts using the endogenously produced H2. The favorable catalytic properties of the RFNY catalyst, including high reducibility, acidity, metal dispersion, the synergistic effect of all the metals, and appropriate pore and particle size resulted in the highest catalytic activity. Maximum 92% delignification efficiency was achieved with 91% holocellulose retention. The extracted lignin after depolymerization in the same step produced a 19 wt.% yield of phenolic monomers. Increasing the duration of the reaction from 2 to 6 h increased the selectivity to saturated alkyl chain phenolics (1 to 16 wt.%) at the expense of hemicellulose (50 to 9%). The fate of carbohydrates left behind after the RCF (CS-RCF) process was analyzed through enzymatic saccharification and compared with raw CS and acid-pretreated CS. In conclusion, CS-RCF yielded maximum glucose yield (45 g/L) within an incubation period of 72 h.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
2462707
Report Number(s):
NREL/JA--2800-91579; MainId:93357; UUID:b8f63cdd-b13c-4072-abc4-8caef90dba74; MainAdminId:73964
Journal Information:
Biomass Conversion and Biorefinery, Journal Name: Biomass Conversion and Biorefinery Vol. 15; ISSN 2190-6815
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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