Catalytic purification of acrylonitrile-containing exhaust gases from petrochemical industry by metal-doped mesoporous zeolites

Zhang, Runduo; Shi, Dongjun; Liu, Ning; Chen, Biaohua; Wu, Lianghua; Wu, Libin; Yang, Weimin

doi:10.1016/j.cattod.2015.03.021

Cited by 19 publications

(14 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Os catalisadores a base de óxido de cobre (CuO) são os mais utilizados devido à sua alta atividade, estabilidade térmica e catalítica. (ZHANG et al, 2014;ZHANG et al, 2015). No entanto, as pesquisas por catalisadores para SCC-ACN são incipientes e outros óxidos precisam ser avaliados.…”

Section: Introductionunclassified

Combustão catalítica seletiva de acrilonitrila usando óxidos de cobre, níquel e cério

Melo

Silva

Oliveira³

et al. 2021

Revista Thema

View full text Add to dashboard Cite

A acrilonitrila (ACN) é amplamente usada na produção de borrachas e resinas, mas também considerado um poluente perigoso nos gases de exaustão industrial. Esse trabalho tem como objetivo avaliar a atividade e seletividade de catalisadores comerciais de óxidos de cobre (CuO), níquel (NiO) e cério (CeO2), na reação de combustão catalítica seletiva de acrilonitrila (SCC-ACN). Esses catalisadores foram caracterizados por difratometria de raios X (DRX) e espectrofotometria no UV-VIS. Os resultados mostraram que CuO, NiO e CeO2 são materiais nanocristalinos que apresentam estruturas e transições de transferência de carga características de óxidos de cobre, níquel e cério, respectivamente. O tamanho médio dos cristalitos está no intervalo de 3,2 e 20,7 nm. O CeO2 foi mais ativo para a SSC-ACN em menor temperatura que CuO e NiO. CeO2 e CuO produziram maior quantidade de N2 e todos os catalisadores produziram NOx, porém, esses foram obtidos em menor quantidade sobre CeO2. Desse modo, conclui-se que CeO2 foi o catalisador mais ativo e de menor produção de NOx na SSC-ACN. Palavras-chave: Acrilonitrila; oxidação catalítica; catalisadores; seletividade.

show abstract

Section: Introductionunclassified

Combustão catalítica seletiva de acrilonitrila usando óxidos de cobre, níquel e cério

Melo

Silva

Oliveira³

et al. 2021

Revista Thema

View full text Add to dashboard Cite

show abstract

“…Zhang's group [8,9] studied the combustion of acrylonitrile and acetonitrile over various metals (M = Cu, Co, Fe, V, Mn, Pd, Ag, Pt), and reported good performance of copper-modified mesoporous material. Cu/SBA-15 exhibited a nearly complete conversion of acetonitrile and acrylonitrile together with achieving a good N 2 selectivity of 80% (>350 °C) and 64% (>400 °C), respectively.…”

Section: Introductionmentioning

confidence: 99%

Acetonitrile Combustion over Copper-Based Nanocatalysts: A Structure-Performance Relationship Study

Ponciano¹,

Batista²

2021

View full text Add to dashboard Cite

In this paper, the relationship between activity and structure of Cu2+ in different chemical environments of Cu-BETA, La2CuO4, and CuO nanocatalysts was systematically investigated for acetonitrile combustion. The study revealed that exchanged and octahedral species of Cu2+ coexist in Cu-BETA, while octahedral species are dominant in CuO and La2CuO4. All nanocatalysts achieved high conversion rates of acetonitrile, which rapidly increased with temperature. CuO and La2CuO4 led to the formation of undesired products such as N2O and NO. On the other hand, Cu-BETA showed high acetonitrile conversion along with a high N2 yield. The excellent performance of Cu-BETA can be attributed to the easy reducibility of the highly dispersed Cu-species and the small crystallite size. Cu-BETA also exhibited exceptional stability. Therefore, the high conversion rate and the high N2 yield make Cu-BETA a promising catalyst for acetonitrile combustion.

show abstract

“…Catalysts based on metals Pt, Pd and Rh show good activity in the selective catalytic combustion of acetonitrile and acrylonitrile (SCC-CH 3 CN) at low temperature, but does not yet as selective as the desired products (N 2 and CO 2 ), generating nitrogen oxides (NO x ) besides the high cost of these catalysts for having noble metals. However, a number of catalysts based on metals like Cu, Co and Fe supported in zeolites have been used in SCC-CH 3 CN, among which Cu catalysts obtained better catalytic activities and better selectivity and yield to N 2 [21]. Redox studies in SCC reactions have been presented as the background of the main effect of catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Redox studies in SCC reactions have been presented as the background of the main effect of catalytic activity. The metal oxide redox processes in catalysts have not been so explored, and some works related the metallic dispersion level over supports or itself support effect in [21]. The best of our knowledge claim metal oxide to reoxidation ability, that is fundamental to understand catalytic activity process.…”

Section: Introductionmentioning

confidence: 99%

Redox effects in Cu, Co or Fe in oxides nanocrystals with high catalytic activity for the acetonitrile combustion

2020

View full text Add to dashboard Cite

The cobalt, copper and iron oxides were investigated in selective catalytic combustion (SCC) of acetonitrile toward N 2 in gas phase. Catalysts were characterized by physical-chemical technics like XRD, H 2-TPR, DRS UV-Vis, whose confirmed crystalline phases of CuO, Co 3 O 4 and Fe 2 O 3. Thermodynamic stability of crystalline phase from metal oxides ruled important contributions in redox properties and become able to compare clearly the catalytic activity of the three catalyst. Relationship between H 2-TPR analysis and catalytic results obtained showed great relevance to understand how metal oxide works on reaction, who were related to easy redox process involved. SCC studies were carried out with range of 100-600 °C and Co 3 O 4 showed best activity (100% conversion at 570 °C) and high selectivities to N 2 and CO 2 starting in lower temperature. Byproducts from nitrogen-compounds were observed in low quantities for all catalysts.

show abstract

Catalytic purification of acrylonitrile-containing exhaust gases from petrochemical industry by metal-doped mesoporous zeolites

Cited by 19 publications

References 32 publications

Combustão catalítica seletiva de acrilonitrila usando óxidos de cobre, níquel e cério

Combustão catalítica seletiva de acrilonitrila usando óxidos de cobre, níquel e cério

Acetonitrile Combustion over Copper-Based Nanocatalysts: A Structure-Performance Relationship Study

Redox effects in Cu, Co or Fe in oxides nanocrystals with high catalytic activity for the acetonitrile combustion

Contact Info

Product

Resources

About