Chemistry is a central science, and the solution of resources, energy, environment and health problems faced by human beings depends on the research and development of chemistry to a great extent. One of the main development directions of chemistry is to deeply study the theory of chemical reaction, so as to reveal the channel from raw materials to products, and then design the best chemical process with catalysts as the core. Energy is an area related to national sustainable development and strategic security. How to develop new energy-saving conversion technologies and clean energy is not only related to energy efficiency, but also to global environmental climate change, which is a major national demand. The energy industry depends largely on chemical processes, and more than 90% of energy consumption depends on chemical technology. How to control the chemical reaction of low-grade fuel so that we can not only protect the environment, but also make the energy cost reasonable is a big problem facing chemistry. The transformation and comprehensive utilization of fossil energy is very important. With the rapid development of China's economy, China has made great achievements in various constructions, but it has also paid the price of resources and environment. Today, energy resources are obviously constrained, the contradiction between energy supply is prominent, and energy and environmental pollution are serious, which has become an important bottleneck restricting China's energy development. To solve the energy problem in China, the fundamental way out is to persist in developing new technologies and saving resources, vigorously promote energy conservation and consumption reduction, use energy efficiently, and break through the bottleneck of energy development in China. Efficient energy utilization is a new energy utilization technology based on the new technology, new process or new concept framework of traditional energy system. Efficient use of energy technology can greatly improve the comprehensive utilization efficiency of energy and effectively reduce pollution emissions. Efficient energy utilization technology mainly refers to cogeneration technology and fuel cell technology. Cogeneration of heat and power is an advanced form of energy utilization, which generates both electric energy and heat energy. It has many advantages, such as reducing energy consumption, improving air quality, supplementing power supply, saving urban land, improving heating quality, facilitating comprehensive utilization, improving city image and reducing safety accidents, so all countries in the world are developing vigorously. There are many international trends to develop cogeneration, among which the comprehensive utilization efficiency of cogeneration in Denmark exceeds 70%. This small-scale micro cogeneration is called distributed energy internationally. Distributed energy technology is very different from traditional energy utilization. Instead of pursuing economies of scale, it pays more attention to the rational allocation of resources, pursues the maximization of energy utilization efficiency and the optimization of efficiency, makes full use of various resources, supplies electricity and heat nearby, and minimizes intermediate transmission losses. Distributed energy can be coordinated and optimized with the energy demand system of end energy users, and the supply and demand systems can be effectively connected through information technology to realize diversified optimization and integration. Online cooperation can be realized in gas pipe network, low-voltage power network, heating pipe network, cold source pipe network and information internet, which can support and balance each other and form a diversified energy network, so that the energy supply can better match the actual demand of energy. It is not only a collection of some traditional energy technologies, but also a brand-new energy comprehensive utilization system. At present, a key point in developing energy-saving technology is "fuel cell" technology. Fuel cells have higher energy efficiency and less pollution. Theoretically, fuel cells use hydrogen energy, which belongs to renewable energy. However, hydrogen that can be directly used in nature does not exist at all, and hydrogen production requires other external energy sources. The technical direction of hydrogen production in China is how to use natural gas, coal gasification, methanol, ethanol and other energy sources, especially the technology of underground controlled gasification of abandoned underground coal resources to produce hydrogen. Fuel cells can not only solve the power problem of human development, but also solve the problem of replacing oil. Although fuel cell technology itself should belong to new energy, most fuel cells will not rely on renewable energy. Energy efficient utilization technologies such as cogeneration and fuel emission technology are all new energy utilization technologies based on new technologies, new processes or new concept frameworks, although they are not renewable energy. According to experts' calculation, the energy utilization efficiency can be improved by 1 percentage point, and the energy cost can be saved by more than1300 million yuan. Promoting the rational and efficient utilization of energy is of far-reaching strategic significance to the sustainable development of China's economy. Efficient use of energy to promote the sustainable development of national economy