Taxa de reação

Em química e mais especificamente na área de cinética química taxa de reação ou, um tanto impropriamente¹, velocidade de reação é uma medida da rapidez com que uma reação se efetua.[1] De modo mais preciso, é a taxa de variação das concentrações dos reagentes e produtos, divididos pelos respectivos coeficientes estequiométricos, independentemente do sinal algébrico obtido.

A taxa de reação pode determinar o tempo que um produto é formado à medida que o reagente é consumido de modo proporcional a concentração de produto formado. Por exemplo se x de reagente é consumido então x de produto é formado, no caso de uma reação simples.

A taxa é medida experimentalmente, pela concentração de produto formado dividido pelo intervalo de tempo de consumo dos reagentes nesse intervalo até um desses reagentes venha a ser o limitante da reação.

É aplicado em processos industrialmente importantes[2][3][4][5], em bioquímica [6][7][8] e em química ambiental[9][10][11].

Notas

  1. É mais recomendável deixar o termo velocidade para os conceitos envolvendo variação do espaço percorrido/distância/posição com o tempo. Ver velocidade.

Referências

  1. ↑ «Taxa de reação». Encyclopædia Britannica Online (em inglês). Consultado em 11 de maio de 2020 
  2. ↑ The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts. Journal of Catalysis, 2014, 311, 369-385. https://core.ac.uk/download/pdf/210625575.pdf
  3. ↑ Kinetic studies of propane oxidation on Mo and V based mixed oxide catalysts. Berlin, 2011. https://pure.mpg.de/rest/items/item_1199619_5/component/file_1199618/content
  4. ↑ Sánchez, María A.; Vicerich, María A.; Fonseca Benítez, Cristhian; Nardi, Franco; Passamonti, Francisco J.; Mazzieri, Vanina A. (agosto de 2024). «Selective hydrogenation of biomass-derived fatty acid methyl esters to fatty alcohols on RuSn–B/Al2O3 catalysts: analysis of the operating conditions and kinetics». Reaction Kinetics, Mechanisms and Catalysis (em inglês) (4): 2173–2195. ISSN 1878-5190. doi:10.1007/s11144-024-02661-7. Consultado em 22 de setembro de 2024 
  5. ↑ Elizalde, Ignacio; Mederos, Fabián S.; del Carmen Monterrubio, Ma.; Casillas, Ninfa; Díaz, Hugo; Trejo, Fernando (fevereiro de 2019). «Mathematical modeling and simulation of an industrial adiabatic trickle-bed reactor for upgrading heavy crude oil by hydrotreatment process». Reaction Kinetics, Mechanisms and Catalysis (em inglês) (1): 31–48. ISSN 1878-5190. doi:10.1007/s11144-018-1489-7. Consultado em 22 de setembro de 2024 
  6. ↑ Nowak, Claudia; Pick, André; Csepei, Lénárd‐István; Sieber, Volker (5 de outubro de 2017). «Characterization of Biomimetic Cofactors According to Stability, Redox Potentials, and Enzymatic Conversion by NADH Oxidase from Lactobacillus pentosus». ChemBioChem (em inglês) (19): 1944–1949. ISSN 1439-4227. doi:10.1002/cbic.201700258. Consultado em 22 de setembro de 2024 
  7. ↑ Paz, Alejandro Pérez (29 de agosto de 2024). «Analytical solution to the simultaneous Michaelis-Menten and second-order kinetics problem». Reaction Kinetics, Mechanisms and Catalysis (em inglês). ISSN 1878-5190. doi:10.1007/s11144-024-02703-0. Consultado em 22 de setembro de 2024 
  8. ↑ Hoyt, Emily A.; Cal, Pedro M. S. D.; Oliveira, Bruno L.; Bernardes, Gonçalo J. L. (25 de fevereiro de 2019). «Contemporary approaches to site-selective protein modification». Nature Reviews Chemistry (em inglês) (3): 147–171. ISSN 2397-3358. doi:10.1038/s41570-019-0079-1. Consultado em 22 de setembro de 2024 
  9. ↑ Suhaimi, Nurul Amanina A.; Roslan, Nur Nabaahah; Amirul, Nur Batrisyia; Lau, Harry Lik Hock; Hasman, Alessandra Anne; Nur, Muhammad; Lim, Jun Wei; Usman, Anwar (21 de agosto de 2024). «Unraveling the photocatalytic degradation kinetics and efficiency of methylene blue, rhodamine B, and auramine O in their ternary mixture: diffusion and conformational insights». Reaction Kinetics, Mechanisms and Catalysis (em inglês). ISSN 1878-5190. doi:10.1007/s11144-024-02712-z. Consultado em 22 de setembro de 2024 
  10. ↑ Djoudi, Lynda; Achour, Achouak; Necira, Zelikha; Abba, Malika; Omari, Mahmoud (abril de 2024). «Kinetics of the photocatalytic degradation of methylene blue under natural sunlight irradiation using nanocatalysts Ce3+ and Mg2+ co-doped CaFeO3−δ». Reaction Kinetics, Mechanisms and Catalysis (em inglês) (2): 1141–1155. ISSN 1878-5190. doi:10.1007/s11144-024-02565-6. Consultado em 22 de setembro de 2024 
  11. ↑ Hamiche, Anissa; Yahiaoui, Idris; Khenniche, Lamia; Amrane, Abdeltif; Aissani-Benissad, Farida (fevereiro de 2024). «Degradation of paracetamol by sulfate radicals using UVA-irradiation/heat activated peroxydisulfate: kinetics and optimization using Box–Behnken design». Reaction Kinetics, Mechanisms and Catalysis (em inglês) (1): 433–451. ISSN 1878-5190. doi:10.1007/s11144-023-02530-9. Consultado em 22 de setembro de 2024 
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