What are the advantages of the second generation biofuels? What is this?

The second generation of biofuel refers to the development of the application mode of cellulose ethanol by getting rid of the mode that corn and other food crops are converted into biofuel, and then using wheat straw, grass, wood and other agricultural and forestry wastes as the main raw materials. Compared with the first generation of biofuels, the second generation of biofuels has great advantages. first

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Automobile engines can directly use gasoline or diesel mixed with bioethanol without modification; Secondly, the cost of producing the second generation bioethanol by catalytic enzyme technology will drop rapidly in the next few years, and the feasibility of large-scale industrial production is very strong; Thirdly, there are a large number of cellulosic agricultural wastes such as straws. For example, China agriculture produces about 700 million tons of straw every year, and the supply is very sufficient. In the long run, agricultural production waste can also be used to produce new biopolymer materials. Although the second generation of biofuels has a strong advantage in reducing carbon emissions, it still cannot get rid of the fatal defect of biofuels, that is, low energy density. The low energy density makes the enterprises producing biofuels have to maintain a huge energy supply hinterland, and it is still unknown whether the energy consumption of transporting these raw materials can be completely offset by the generated fuel. Moreover, it is difficult to estimate whether the use of agricultural waste, such as straw, which should have returned to the land circle to make energy, will have an impact on the ecology and whether this impact will lead to ecological imbalance.