New isopropanol dehydration catalyst based on tungsten carbide prepared by modified self-propagating high-temperature synthesis

Zurnachyan, A. R.; Manukyan, Kh.V.; Kharatyan, S. L.; Матышак, В. А.; Mnatsakanyan, R. A.

doi:10.1134/s0023158411060231

Cited by 6 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is possible that, following solid-state carbidizaton, the reaction may be significantly accelerated due to the shorter diffusion distances of MoO 2 and carbon inside MoO 2 /C composite particles ( Figure 6): 2MoO 2(s) + 5C (s) = Mo 2 C (s) + 4CO (g) (4) In contrast to Mo 2 C, the formation of WC occurs by a different pathway. XRD analysis shows the multistage conversion of WO 3 to WC through W and W 2 C phases that is consistent with previously reported data [28][29][30] It should be noted that vapor pressure of WO 3 at 700-1000 o C is only ~10 -4 kPa 24 . Therefore, the reduction of WO 3 to W is slow.…”

Section: Synthesis and Characterization Of Catalystssupporting

confidence: 85%

Microwave-assisted synthesis of carbon-supported carbides catalysts for hydrous hydrazine decomposition

Mnatsakanyan

Zhurnachyan

Матышак

et al. 2016

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

Section: Synthesis and Characterization Of Catalystssupporting

confidence: 85%

Microwave-assisted synthesis of carbon-supported carbides catalysts for hydrous hydrazine decomposition

Mnatsakanyan

Zhurnachyan

Матышак

et al. 2016

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

“…A conversão catalítica de isopropanol é considerada como uma reação modelo para a determinação da natureza de sítios ativos (ZURNACHYAN et al, 2011). A reação de desidratação ocorre em sítios ácidos, enquanto que a reação de desidrogenação formando acetona ocorre em sítios básicos (MAN-RÍQUEZ et al, 2004), que podem estar presentes também em catalisadores ácidos.…”

Section: Resultsunclassified

Cinzas De Casca De Arroz Como Fonte Alternativa De Silício Para a Síntese De Zeólita Beta

Enzweiler

Barbosa-Coutinho

Schwaab

2014

REGET

View full text Add to dashboard Cite

ResumoCinzas de casca de arroz são resíduos agroindustriais gerados em larga escala que podem acarretar problemas ambientais e riscos à saúde da população. Como solução para este problema, as cinzas podem ser utilizadas como fonte alternativa de sílica altamente reativa, com vasto campo de aplicação, como, por exemplo, na síntese de catalisadores de alto teor de silício, como as zeólitas. Neste trabalho, zeólita beta foi sintetizada usando sílica amorfa, extraída de cinzas de casca de arroz, e pseudoboemita. Utilizando esta fonte alternativa de silício foi possível a formação da estrutura zeolítica com excelentes propriedades catalíticas. A aplicação da zeólita beta na desidratação do isopropanol possibilitou a produção de propeno com alta seletividade a baixas temperaturas, mostrando que a utilização de sílica proveniente de cinzas de cascas de arroz tem grande potencial tecnológico e ambiental.Palavras-chave: Zeólita beta; catalisador; cinzas de casca de arroz; isopropanol; propeno. AbstractRice husk ash is an agroindustrial residue generated in large scale that can cause environmental problems and risks to people health. As a solution to this problem, this ash could be used as an alternative source of high reactive silica, with a wide field of applications, such as, for example, in the synthesis of catalysts with high silicon content. In this work, beta zeolite was synthesized using amorphous silica, extracted from rice husk ash, and pseudo-boehmite. Using this alternative source of silicon, it was possible to form the zeolitic structure with excellent catalytic properties. The application of the beta zeolite in the dehydration of isopropanol enables the production of propylene with high selectivity at low temperatures, showing that the use of silica from rice husk ash has a great technological and environmental potential.

show abstract

Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

View full text Add to dashboard Cite

New isopropanol dehydration catalyst based on tungsten carbide prepared by modified self-propagating high-temperature synthesis

Cited by 6 publications

References 17 publications

Microwave-assisted synthesis of carbon-supported carbides catalysts for hydrous hydrazine decomposition

Microwave-assisted synthesis of carbon-supported carbides catalysts for hydrous hydrazine decomposition

Cinzas De Casca De Arroz Como Fonte Alternativa De Silício Para a Síntese De Zeólita Beta

Tungsten Carbides

Contact Info

Product

Resources

About