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Oxidação catalÃtica seletiva da amonÃaca em azoto e vapor de água
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ISBN10: 6630207467
ISBN13: 9786630207460
Publisher: Edicoes Nosso Conhecimento
Published: Jul 2 2026
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786630207460
Publisher: Edicoes Nosso Conhecimento
Published: Jul 2 2026
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
Uma quantidade crescente de fuga de amonÃaca afeta a tecnologia DeNOx utilizada para reduzir as emissões de óxidos de azoto provenientes de centrais elétricas e outras fontes fixas de emissões de NOx, camiões pesados e automóveis de passageiros a gasolina e a gasóleo. É necessário controlar e eliminar as emissões de amonÃaca nos fluxos de resÃduos. O processo de oxidação catalÃtica seletiva da amonÃaca em azoto e vapor de água é um dos métodos mais promissores para a eliminação da amonÃaca tóxica dos gases de combustão. Como catalisadores para o processo, foram testados óxidos metálicos mistos derivados da hidrotalcite. Os estudos realizados no âmbito da investigação foram apresentados em quatro artigos cientÃficos (Catalysis Letters, Applied Catalysis B: Environmental, Journal of Thermal Analysis and Calorimetry, Chemik). Verificou-se que os óxidos metálicos mistos são ativos, seletivos em relação ao azoto e estáveis na oxidação da amonÃaca. A sua atividade e seletividade dependem fortemente da composição quÃmica e de fase, bem como das suas propriedades redox. Foi proposta uma composição ótima dos catalisadores que garante um elevado desempenho catalÃtico. O mecanismo SCR interno (i-SCR) foi investigado para a reação realizada nos catalisadores estudados.
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