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Previous issue date: 2013-07-31 / In this work were synthesized the materials called vanadyl phosphate, hydrogen
vanadyl phosphate and vanadyl phosphate doped by transition metals with the aim in
adsorption the following compounds: ammonia, hydrogen sulfide and nitrogen oxide. To
characterize the starting compounds was used DRX, FTIR, FRX and TG analysis. After the
characterization of substrates, proceeded de adsorption of NH3 and H2S gases in reactor,
passing the gases with continuous flow for 30 min and room temperature. Gravimetric data
indicate that the matrices of higher performance in adsorption of ammonia was those doped
by aluminum and manganese, obtaining results of 216,77 mgNH3/g and 200,40 mgNH3/g of
matrix, respectively. The matrice of higher performance in adsorption of hydrogen sulfide
was that doped by manganese, obtaining results of 86,94 mgH2S/g of matrix. The synthesis of
substrates VOPO4.2H2O and MnVOPO4.2H2O with nitrogen oxide was made in solution,
aiming the final products VOPO4.G.nH2O and MnVOPO4.G.nH2O (G = NO and n = number
of water molecules). The thermo analytical behavior and the infrared spectroscopy are
indicative of formation of VOPO4.2,5NO.3H2O compound. Results of scanning electron
microscopy (SEM) and Energy dispersive spectroscopy (EDS) of materials vanadyl phosphate
and vanadyl phosphate modified after reaction in solid state or in solution with the gases show
morphology changes in substrates, beyond the formation of orthorhombic sulfur crystals over
their respective hosts when these adsorb hydrogen sulfide / Neste trabalho foram sintetizados os materiais denominados fosfato de vanadila,
hidrogeno fosfato de vanadila e fosfatos de vanadila dopados por metais de transi??o com fins
na adsor??o de am?nia, sulfeto de hidrog?nio e ?xido de nitrog?nio. Para a caracteriza??o dos
compostos de partida, recorre-se ?s t?cnicas de DRX, FTIR, FRX e TG. Ap?s a
caracteriza??o dos substratos, procedeu-se a adsor??o dos gases NH3 e H2S em reator,
passando os gases a vaz?o cont?nua durante 30 min e temperatura ambiente. Dados
gravim?tricos indicam que as matrizes de maior desempenho na adsor??o de am?nia foram
?quelas dopadas por alum?nio e mangan?s, obtendo resultado de 216,77 mgNH3/g e 200,40
mgNH3/g de matriz, respectivamente. A matriz de maior desempenho para a adsor??o de
sulfeto de hidrog?nio foi ?quela dopada por mangan?s, obtendo resultado de 86,94 mgH2S/g
de matriz. As s?nteses dos substratos VOPO4.2H2O e MnVOPO4.2H2O com o g?s ?xido de
nitrog?nio foram realizadas em solu??o, objetivando-se os produtos finais VOPO4.G.nH2O e
MnVOPO4.G.nH2O (G = NO e n = n?mero de mol?culas de ?gua). O comportamento
termoanal?tico e a espectroscopia na regi?o do infravermelho s?o indicativos da forma??o do
composto VOPO4.2,5NO.3H2O. Resultados de microscopia eletr?nica de varredura (MEV) e
espectroscopia de energia dispersiva (EDS) dos materiais fosfatos de vanadila e fosfatos de
vanadila dopados ap?s rea??o no estado s?lido ou em solu??o com os gases indicam mudan?a
na morfologia dos substratos, al?m da forma??o de cristais de enxofre ortorr?mbico sobre
seus respectivos hospedeiros quando estes adsorvem sulfeto de hidrog?nio
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17770 |
| Date | 31 July 2013 |
| Creators | Miranda, Jose Carlos Vieira de |
| Contributors | CPF:59668741404, http://lattes.cnpq.br/6868773742105583, Silva, Ademir Oliveira da, CPF:16225422404, http://lattes.cnpq.br/3511004608337461, Silva, Ana L?cia Rodrigues da, CPF:51101173300, http://lattes.cnpq.br/3799043971887247, Bezerra, C?cero Wellington Brito, CPF:31155910397, http://lattes.cnpq.br/1474300723265204, Dantas, Deyse de Souza, CPF:02771919478, http://lattes.cnpq.br/3229830569545582, Silva, Rui Carlos Barros da, CPF:01146680783, http://lattes.cnpq.br/4581242801952845, Farias, Robson Fernandes de |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Qu?mica, UFRN, BR, F?sico-Qu?mica; Qu?mica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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