Table 1.

List and scope of review articles published for glycerol valorisation to value added products.

S. No.	Title of article	Scope and attribute	Authors
1.	Glycerol acetals and ketals as possible diesel additives. A review of their synthesis protocols	Different approaches and techniques used to obtain glycerol acetals and ketals	Ancuţa Roxana Trifoi, Paul Şerban Agachi, Timea Pap (2016)
2.	Catalytic vaporization of raw glycerol derived from biodiesel: a review	Role of heterogeneous catalyst on the valorisation of glycerol	Sravanthi Veluturla, Narula Archna, D. Subba Rao, N. Hezil, I.S. Indraja & S. Spoorthi (2017)
3.	Glycerol Production and Transformation: A Critical Review with Particular Emphasis on Glycerol Reforming Reaction for Producing Hydrogen in Conventional and Membrane Reactors	Focus on glycerol reforming reactions, catalysts developed for use, membrane catalytic reactors	Giuseppe Bagnato, Adolfo Iulianelli, Aimaro Sanna and Angelo Basile (2017)
4.	Oxygenated fuel additives from glycerol valorization. Main production pathways and effects on fuel properties and engine performance: A critical review	Transformation of glycerol into oxygenated fuel additives and discussion of fuel properties and other characteristics	A. Cornejo, I. Barrio, M. Campoy, J. Lázaro, B. Navarrete (2017)
5.	Review on enzymatic synthesis of value added products of glycerol, a by-product derived from biodiesel production	Different bioconversion technologies of crude-glycerol, relevant approach for the production of various chemicals from bio-glycerol over enzyme and chemical catalysts	J. Pradima, M. Rajeswari Kulkarni, Archna (2017)
6.	Continuous Flow Conversion of Glycerol into Chemicals: An Overview	Glycerol valorization in liquid phase continuous flow systems using different types of catalysts and processes	Christophe Len, Frederic Delbecq, Cristobal Cara Corpas, Encarnacion Ruiz Ramos (2017)
7.	Environmental and economical perspectives of a glycerol Biorefinery	Chemical research and process design in the development of CO2- and other biorefineries	Giacomo M. Lari, Giorgio Pastore, Moritz Haus, Yiyu Ding, Stavros Papadokonstantakis, Cecilia Mondelli and Javier Pérez-Ramírez (2018)
8.	Techno-Economic Analysis of a Glycerol Biorefinery	Environmental and economic assessment of a glycerol biorefinery by including operating costs	Sebastiano C. D’Angelo, Agostino Dall’Ara, Cecilia Mondelli, Javier Pérez-Ramírez and Stavros Papadokonstantakis (2018)
9.	A Review on the Catalytic Acetalization of Bio-renewable Glycerol to Fuel Additives	Focus on innovative and potential technologies for sustainable production of solketal	Amin Talebian-Kiakalaieh, Nor Aishah Saidina Amin, Neda Najaafi and Sara Tarighi (2018)
10.	Glycerol from biodiesel production: Technological paths for sustainability	Analysis of patents related to the use of glycerol in the period from 1993 to 2015	Marcos Roberto Monteiro, Cristie Luis Kugelmeier, Rafael Sanaiotte Pinheiro, Mario Otávio Batalha, Aldara da Silva César (2018)
11.	Glycerol valorization under continuous flow conditions-Recent advances	Glycerol valorization to valuable products under liquid phase continuous flow systems using different types of catalysts and processes	Rajender S. Varma, Christophe Len (2018)
12.	Spotlight on biodiversity of microbial cell factories for glycerol conversion	Biodiversity of naturally glycerol consuming Microorganisms - impact and importance	Hannes Russmayer, Michael Egermeier, Denis Kalemasi, Michael Sauer (2019)
13.	Sustainable value-added C3 chemicals from glycerol transformations: A mini review for heterogeneous catalytic processes	Progress on sustainable C3 chemical production from catalytic glycerol transformations	Yuan Wang, Yang Xiao, Guomin Xiao (2019)