Research on the Acidity of the Double-function Catalyst for DME Synthesis from Syngas

Wang, Ligang; Qi, Yue; Wei, Yingxu; Fang, Deren; Sun, Meng; Liu, Zhongmin

doi:10.1007/s10562-005-9191-6

Cited by 38 publications

(40 citation statements)

References 15 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The catalysts exhibiting activities in 1-butene double-bond-shift isomerization reaction had an evident desorption peak of ammonia around 100°C. The peak can be assigned to NH 3 weak acid sites [30,31]. The peak area broadly increased with the yield of 2-butene enhanced, suggesting the surface weak acid sites have positive impacts on the catalytic performances as reported [32][33][34].…”

Section: Effect Of the Surface Acidity On Catalytic Performancementioning

confidence: 99%

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

Yang

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

Section: Effect Of the Surface Acidity On Catalytic Performancementioning

confidence: 99%

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

Yang

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

“…Here a relatively small amount of acid sites were sufficient to convert methanol into DME as the rate of dehydration due to HZSM-5 (80) is much faster than the methanol formation rate (rapid transformation of methanol to DME). Wang et al [48] used two kinds of HZSM-5 zeolite in the STD at different (SiO 2 /Al 2 O 3 ) ratio with CuO/ZnO/Al 2 O 3 . They found that the acidity of HZSM-5 played a critical role in the performance of STD catalyst, and that an optimal acidic amount was required to obtain the best activity of STD catalyst; more and less acidic amounts were both unfavourable for DME.…”

Section: Cza/hzsm-5(80)mentioning

confidence: 99%

Activity and deactivation studies for direct dimethyl ether synthesis using CuO–ZnO–Al2O3 with NH4ZSM-5, HZSM-5 or γ-Al2O3

Abu‐Dahrieh

Rooney

Goguet

et al. 2012

Chemical Engineering Journal

View full text Add to dashboard Cite

“…Furthermore, zeolites are more resistant than -Al 2 O 3 towards poisoning of acid sites by the water by-product [4,5,6]. Among the zeolites, the medium pore ZSM-5 (MFI) has been by far the most widely applied as the acid component in bifunctional DME synthesis catalysts [5,7,8,9,10,11], though other zeolites such as ferrierite, MCM-22 and its delaminated counterpart ITQ-2, IM-5, and TNU-9 have also been investigated [12,13].…”

Section: Introductionmentioning

confidence: 99%

The influence of zeolite surface-aluminum species on the deactivation of CuZnAl/zeolite hybrid catalysts for the direct DME synthesis

García‐Trenco

Martı́nez

2014

Catalysis Today

View full text Add to dashboard Cite

ElsevierGarcía Martinez Feliu, A. (2014). The influence of zeolite surface-aluminum species on the deactivationof CuZnAl/zeolite hybrid catalysts for the direct DME synthesis. Catalysis Today. 227:144-153. doi:10.1016Today. 227:144-153. doi:10. /j.cattod.2013 AbstractIn this work, an original approach for preparing Cu-ZnO+H-ZSM-5 (Si/Al=15, denoted as Z5) hybrid catalysts displaying enhanced stability during the direct DME synthesis from syngas is presented. The adopted preparation strategy was based on the effective confinement of the copper catalyst within the pores of an SBA-15 silica carrier (d pore = 7.0 nm) prior to mixing with the acid zeolite. In order to maximize the Cu-ZnO interface area (where active Cu 0 sites are likely located) the walls of the SBA-15 silica were coated with a near-monolayer of ZnO (17 wt% Zn) prior the incorporation of copper (in concentrations of 10, 15, and 20 wt%) by the so-called ammonia-driving deposition-precipitation (ADP) method. Copper nanoparticles sizing 5-6 nm after H 2 -reduction (HRTEM) were effectively confined inside the SBA-15 mesopores (as supported by HAADF-STEM) for Cu loadings of up to 15 wt%. Higher Cu loadings (20 wt%) lead to large, XRD-visible, CuO nanoparticles residing out of the SBA-15 pores. The confined catalyst loaded with 15 wt% Cu (15Cu/Zn@S15) displayed the highest Cu 0 surface area (determined by N 2 O-RFC) and methanol synthesis activity. Then, hybrid catalysts based on this methanol synthesis function (15Cu/Zn@S15+Z5) were prepared in a 15Cu/Zn@S15:Z5 mass ratio of 2:1 by two methods: a) grinding the mixture of powders prior to pelletizing (method G), and b) mixing the pre-pelletized components (method M). Equivalent hybrids comprising a conventional coprecipitated Cu-ZnO-Al 2 O 3 (CZA) catalyst were also prepared for comparative purposes (CZA+Z5). The catalysts were evaluated for direct DME synthesis (533 K, 4.0 MPa) in runs lasting ca. 24 h. It was found that the confined 15Cu/Zn@S15+Z5 hybrids deactivated at a much lower rate than those based on CZA regardless the method of preparation. In turn, while conventional CZA+Z5 catalysts prepared by grinding (G) experienced a higher deactivation than that obtained by mixing (M) due to the contribution of detrimental interactions between the copper and zeolite components in the former, no differences in the deactivation rate were observed for the 15Cu/Zn@S15+Z5 hybrids prepared by grinding and mixing. The improved stability of these hybrid catalysts is accounted for by the inhibition of both detrimental interactions (by avoiding the direct contact of copper active sites and the zeolite surface) and extensive metal sintering (by limiting the extent of Cu 0 crystal growth) induced by the effective confinement of the Cu-based catalyst within the SBA-15 pores.

show abstract

Research on the Acidity of the Double-function Catalyst for DME Synthesis from Syngas

Cited by 38 publications

References 15 publications

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

Activity and deactivation studies for direct dimethyl ether synthesis using CuO–ZnO–Al2O3 with NH4ZSM-5, HZSM-5 or γ-Al2O3

The influence of zeolite surface-aluminum species on the deactivation of CuZnAl/zeolite hybrid catalysts for the direct DME synthesis

Contact Info

Product

Resources

About