Recently, after the review and recommendation of the degree evaluation sub committee of Tianjin University, Guo Mingyu, a doctoral student and Zheng Yanfei, a master student under the guidance of Teacher Liu Qingling of our group; The graduation thesis completed by Bi Yalian, a master student under the guidance of Liu Caixia, and Hu Xiaofang, a master student under the guidance of song Chunfeng, won the excellent degree thesis of the University.
Study on sulfur resistant SCR catalyst for NOx removal from marine engine exhaust by Guo Mingyu
The research focus of this doctoral thesis is SCR catalyst applied to ship exhaust NOx treatment, and the traditional V2O5-WO3 / TiO2 catalyst and new CR based catalyst are studied respectively. V2O5-WO3 / TiO2 catalyst was modified by adding acidic additives and redox additives respectively. The relationship between surface structure, acidity, activity and selectivity of V2O5-WO3 / TiO2 catalyst modified by two different series of additives was established for the first time, and the effect of TiO2 support properties of catalyst modified by additives on SCR reaction was revealed. Through the research and development of new SCR catalyst materials, the long-standing problems of low-temperature activity of SCR catalyst and sulfur poisoning of SCR catalyst at low temperature 230 ° C were solved, crzrceox new SCR catalyst materials with excellent low-temperature sulfur and water resistance were obtained, and the ternary SCR reaction mechanism of new CR based catalyst modified by redox additives and acid additives was established, It provides a further idea for the study of sulfur resistance of SCR catalyst.
To some extent, this study provides new ideas, new materials and new research methods for SCR catalyst used to remove NOx from ship exhaust, and has achieved some research results.
Zheng Yanfei, preparation of new catalysts for MOFs derivatives and Study on their catalytic oxidation performance for VOCs
Volatile organic compounds (VOCs), as important precursors of fine particulate matter (PM2.5) and ozone air pollution, not only affect environmental quality, but also endanger human health. Among them, ketones, as oxygen-containing volatile organic compounds (OVOCs), widely exist in the environment and are rich in content. They have attracted special attention because of their high reactivity. As an efficient VOCs end treatment technology, the core of catalytic oxidation technology is the catalyst with excellent performance. Taking acetone as the target pollutant, MOFs derivatives with high catalytic activity, namely co3o4-m, CeO2 / Co3O4 and MnOx catalysts, were designed and prepared by pyrolysis of metal organic framework materials (MOFs). Their catalytic performance and stability for the oxidation of acetone were investigated and the reaction mechanism was analyzed.
Bi Yalian, small hole cu-zk-5 molecular sieve for denitration of diesel vehicle exhaust - Preparation, performance evaluation and reaction mechanism study
As the main undertaker of road transportation, heavy-duty diesel vehicles will emit a large amount of NOx during use, causing a series of environmental pollution problems. Ammonia selective catalytic reduction (nh3-scr) is internationally recognized as the most effective technology that can meet the emission standard of NOx in diesel vehicle exhaust at national VI (European VI). At present, cu-ssz-13 with Cha topology is a commercial catalyst for SCR treatment of diesel vehicle exhaust. However, the molecular sieve is limited by foreign patents, and the N, N, n-trimethyl-1-adamantane ammonium hydroxide (tmada-oh) template required for synthesis is expensive and highly toxic, which limits its industrial application. Therefore, the research and development of new configuration SCR catalyst for diesel vehicles with excellent performance and environment-friendly has become the development direction in this field. Zk-5 topology is similar to SSZ-13, and can be successfully synthesized by using low-cost inorganic template and low-toxic organic template respectively. Based on this, this paper selects small hole cu-zk-5 (KFI topology) molecular sieve as the research object, explores its feasibility as SCR catalyst for diesel vehicles, and systematically studies the preparation method of cu-zk-5 molecular sieve catalyst, The nh3-scr reaction mechanism and propylene poisoning mechanism on the surface of cu-zk-5 catalyst were explored. The research results have certain guiding significance for the development of high-performance molecular sieve SCR denitration catalyst.
Hu Xiaofang, collaborative purification and recycling of CO2 from beer wastewater and flue gas based on microalgae culture
With the large-scale industrialization in the world, the industrial processes represented by food, chemical industry, electric power and other industries emit a large amount of greenhouse gas CO2 and wastewater to the natural environment, which seriously threatens people's health and survival. The biological treatment technology based on microalgae culture has gradually become a green and economic means of environmental treatment because it can utilize the characteristics of high COD, high N, P and other nutrient elements in wastewater and CO2 in fixed flue gas. Therefore, this paper attempts to develop a green integrated process, which uses the organic and inorganic wastes in beer wastewater and coal-fired flue gas as the nutrient source for microalgae growth, and achieves the objectives of pollutant purification and biomass production, so as to realize the resource reuse of waste.
It is hoped that the younger martial brothers and sisters will take these excellent graduates as an example, learn from their meticulous attitude towards scientific research, never forget their original intention in their future scientific research path, not afraid of difficulties, have the courage to explore, explore and innovate, and contribute their strength to the scientific research cause of the motherland.
