Catalysts with an active coating dedicated to removal of nitrogen oxides from gases: investigation and device development

Abstract

The dissertation deals with nitrogen oxides (NOx) removal from gas by using the selective catalytic reduction approach. The research object covers supported catalysts with the active coating made of transition metal oxides for removing NOx from gas. The purpose of the dissertation is to develop novel supported catalysts with the active coating, possessing high NOx conversion efficiency and chemical stability at low temperatures. The dissertation approaches several tasks. Task 1 is related to a theoretical investigation of the fluidized bed catalyst for the reduction of NOx. Tasks 2 and 3 are aimed at the creation of a laboratory setup as well as preparing catalysts using various carriers, active components, and methods, with the following investigation of NOx removal efficiency of the prepared catalysts. Task 4 focuses on a detailed investigation of the physicochemical properties of the prepared catalysts. Task 5 faces numerical simulation of the NOx catalytic reduction efficiency using the fixed bed supported catalyst. The final Task 6 is related to engineering solutions aimed at the creation of the apparatus for NOx removal from flue gas using the supported catalysts investigated. The dissertation consists of the introduction, 3 chapters, general conclusions, recommendations, references, and the list of scientific publications by the author on the topic of the dissertation. The introduction discusses the research problem, the relevance of the dissertation, the object of the research, formulates the aim and tasks, describes the research methodology, scientific novelty of the dissertation, defended statements and the practical value of the research findings. At the end of the introduction, the author’s publications on the topic of the dissertation and the structure of the dissertation are provided. An overview of the main anthropogenic sources of NOx and their impact on the environment and human health, the application of the selective catalytic method for NOx removal from gas, and analysis of different catalysts available is presented in the 1st chapter. The second chapter includes methodologies applied for preparation and investigation of the catalysts. The third chapter covers the results and discussion of theoretical, experimental research and simulation, as well as engineering solutions. 5 articles focusing on the subject of the dissertation have been published in the scientific journals included in the Clarivate Analytics Web of Science database. 2 patents of the Republic of Lithuania have been granted, and 2 European patent applications have been submitted to the European patent office. 8 presentations on the subject of the dissertation have been presented in the conferences at both the national and international level.