Handbook of Biomass Valorization for Industrial Applications. Группа авторов. Читать онлайн. Newlib. NEWLIB.NET

Автор: Группа авторов
Издательство: John Wiley & Sons Limited
Серия:
Жанр произведения: Физика
Год издания: 0
isbn: 9781119818793
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       4Department of Biotechnology, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, India

       Abstract

      This chapter will describe the recent developments in the efficient utilization of various carbon-based materials as catalysts for the valorization of glycerol waste from the biodiesel industry. Carbon-based materials are generally prepared from biomass, a renewable feedstock and produced in a large amount from numerous sources such as agricultural wastes, forest residues, and food wastes. Biomass materials consist of cellulose, hemicelluloses, and lignin biopolymer, which act as a carbon source for carbon materials. Since a glycerol glut exists in the global market due to rapid growth in biodiesel production, the utilization of value-added products from glycerol is very important for the competitive market of biodiesel with conventional diesel. This chapter thus discusses the basic principles, mechanisms, and advancement in prominent techniques for glycerol valorization along with synthesis, characterization, and function of different carbon-based catalysts. The future prospects of these carbon materials as catalysts for industrial waste utilization are very promising.

      Keywords: Waste to energy, biomass waste, carbon materials, glycerol valorization, biodiesel industry up gradation

      Recently, biomass has received tremendous interest from researchers as an alternative feedstock for sustainable and clean energy production [3]. Biodiesel production using biomass is a sustainable approach due to its use as renewable, non-toxic, and biodegradable fuel with a small emission of air pollutants as compared to petroleum-based fuels [4]. Biodiesel is environmentally friendly due to small carbon monoxide and particulate matter emissions and does not release hydrocarbons [5]. The increased production of oxygen in the case of biodiesel leads to complete combustion [5]. The vital feedstock for biodiesel production is animal fat, vegetable oil, or waste cooking oil. The productions of biodiesel have increased drastically for the past few years due to its direct use in diesel engines without modifications [6]. However, the formation of biodiesel by transesterification of animal fats or vegetable oils as a raw feedstock produces approximately 10 wt% glycerol (1,2,3-propanetriol) as a by-product which increases its manufacturing cost [7]. This is bottleneck of the technology. A glycerol glut exists in the global market due to the fast growth in biodiesel production. Therefore, the biodiesel industry needs to produce valuable products from glycerol and make it more competitive with conventional diesel fuel. It is also important from an environmental and economic viewpoint [8].

      The continuous increase in biodiesel demand will also generate a huge amount of glycerol and therefore, it needs to be utilized [9]. According to 2011 data, globally the total amount of glycerol produced by the biodiesel industry is 66.2%. In the world, the largest biodiesel-producing countries are the United States and Brazil [10]. In the USA, biodiesel consumption increases from 878 million gallons in 2011 to 1,725 million gallons in 2019. To address this issue, the US Department of Energy declared glycerol as a major building block platform chemical for the future. Therefore, the transformation of glycerol to valuable products is a rapidly growing research area that decreases the expenditure of biodiesel production [7, 11].

      The transformation of glycerol into valuable products is essential for the industries because a huge amount of glycerol that is generated through biodiesel production and fermentation of sugars can be utilized judiciously. Moreover, glycerol is a non-hazardous, biodegradable, and bio sustainable compound. Economic and technical analyses indicate that the low cost of glycerol and its multifunctional structure could open a new market for valuable commodity chemicals. Furthermore, glycerol conversion into profitable chemicals and fuels (syngas/hydrogen) will facilitate the substitution of petroleum-based products as well as promote the utilization of clean energy resources [8]. However, glycerol must be purified before any attempt to transform it into value-added products. Many different reaction pathways (biological, thermocatalytic, etc.) have been investigated to derive the various chemicals starting from glycerol. Of the various methodologies, the use of catalysis represents an efficient approach for this purpose.