Preparation, characterization and catalytic activity of mesoporous Ag2HPW12O40/SBA-15 and Ag2HPW12O40/TiO2 composites

Holclajtner-Antunović, Ivanka; Bajuk–Bogdanović, Danica; Popa, Alexandru; Sasca, Viorel; Vasiljević, Bojana Nedić; Rakić, Aleksandra; Uskoković‐Marković, Snežana

doi:10.1016/j.matchemphys.2015.04.052

Cited by 17 publications

(3 citation statements)

References 41 publications

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“…βAgPW-IE has retained a conversion over 81% while βAgPW-WI after 700 min of reaction has significant 86% (Fig. 6) which is the best result ever obtained for Ag-containing heteropolyacids alone and anchored to various carriers (Holclajtner-Antunović et al 2015b). An interesting result is the inflection point before 350 min, when conversion in the presence of βAgPW-WI remains constant and stable, while one recorded for βAgPW-IE descends below βAgPW-WI, even though it was slightly higher at the beginning of the reaction (98%).…”

Section: Catalytic Studymentioning

confidence: 79%

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

et al. 2021

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Heteropolyacids and their salts comprise catalytic centers for the production of ethylene, one of the most important constituents in the chemical industry. The paper emphasizes different synthesis routes of hybrid materials consisting of dodecatungstophosphoric acid silver salt (AgPW) and β zeolite-stepwise wet impregnation, silver-exchange in β zeolite, and dry mixing of precursors. Composite preparation procedures induced minor effects on the weak acid sites, while strong acid sites were increased significantly. β/AgPW composites prepared by two-steps wet impregnation and ion-exchange procedures have strong acid sites content and total acidity higher in comparison to the pure AgPW salt and β zeolite. This is a result of precursors synergetic effect-cumulative strong acidic sites are generated in the presence of well-dispersed Keggin ions on the zeolite network. Composite samples with a higher content of strong acid centers exhibit higher conversion in the ethanol dehydration reaction, i.e., the ion-exchanged βAgPW sample has attained a conversion over 81%, while the wet-impregnated sample has a significant 86%. The distribution and presence of AgPW active phase are found to be crucial for both stable conversion and high selectivity results in ethylene production from ethanol, which is regarded as one of the most significant processes in environmental and sustainable industrial chemistry.

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Section: Catalytic Studymentioning

confidence: 79%

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

et al. 2021

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“…Insoluble salts of PTA self-assemble into large particles (with an average size of 100-2000 nm) during the synthesis process. These agglomerates are composed of small crystallites 10-50 nm in size [21,[23][24][25][26][27][28][29][30]. This structure determines the developed surface and high porosity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Rubidium Salts of Phosphotungstic Acid

Belmesov,

Glukhov,

Tsvetkov

et al. 2023

J. Compos. Sci.

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The work is devoted to the study of the influence of synthesis conditions on the properties of water-insoluble rubidium salts of phosphotungstic acid (PTA). Such heteropoly compounds have a wide range of applications, including in the field of electrocatalysts and solid electrolytes for various electrochemical devices. The acid salts of PTA with high activity of acid sites on the particle surface are of particular interest. It is known that the properties of water-insoluble PTA salts strongly depend on synthesis conditions, such as the ratio of reagents, temperature, concentrations, and other parameters. The work examines the influence of the ratio and concentration of reagents on the sizes of crystallites and agglomerates, specific surface area (SSA), porosity, water content, and ionic conductivity of the synthesized PTA salts. The SSA value of the obtained samples varied in the range of 84–123 m2 g−1, and the ionic conductivity was 13–90 mS cm−1 at room temperature and 75% RH. An increase in the acid concentration and the degree of proton substitution led to an increase in SSA, accompanied by an increase in particle sizes without changing the size of crystallites. The results of the work may be useful for the development of new materials based on the obtained salts in many fields, including hydrogen energy.

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“…A diminuição na área superficial depende da razão de microporos para mesoporos. Quanto maior for a quantidade de poros com tamanhos menores, maior será a redução na área de superfície por causa do fácil preenchimento e bloqueio de poros menores 16. Os prótons do heteropoliácido e os prótons gerados por dissociação de água coordenada dos átomos de prata influenciam o rendimento de etileno, quanto mais água presente nas amostras, mais etileno formado.…”

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Preparação, caracterização e aplicação de derivados do ácido 12- tungstofosfórico suportado em SBA-15

Alves¹

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Agradeço a Deus, por guiar meus passos e conceder as forças necessárias para vencer os obstáculos. A minha mãe Ilsa e minha irmã Thaynara que me incentivaram durante esse período. Mãe agradeço a você por ter possibilitado meu acesso ao conhecimento. Não teria chegado a lugar algum, se não fosse seu amor, carinho e força dedicado a mim. Ao professor Zeca por ter me acolhido no LabCat, pelo empenho, dedicação, paciência e orientação para a conclusão deste trabalho. A professora Sílvia pelos conselhos concedidos. Ao Prof. Gesley pela coorientação neste trabalho. Ao professor Júlio pelas sugestões valiosas que contribuíram significativamente para este trabalho. A Estelle pela amizade e apoio. Obrigada pelos constantes favores prestados, conhecimento compartilhado e descontração. Aos meus amigos do LabCat: Mateus, Munique, Mariane e em especial aqueles que mais me ajudaram nesse trabalho: Elon e Júlia. A Ana Paula pela amizade, estudos e companhia no almoço. A minha amiga Jesyca da UFMT, pela amizade e pelo incentivo mesmo distante. Ao professor Luis Carlos Cides da Silva pelas contribuições e pelas análises de

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Preparation, characterization and catalytic activity of mesoporous Ag2HPW12O40/SBA-15 and Ag2HPW12O40/TiO2 composites

Cited by 17 publications

References 41 publications

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

Synthesis and Properties of Rubidium Salts of Phosphotungstic Acid

Preparação, caracterização e aplicação de derivados do ácido 12- tungstofosfórico suportado em SBA-15

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