Alkali and alkaline-earth cation exchanged chabazite zeolites for adsorption based CO2 capture

Zhang, Jun; Singh, Ranjeet; Webley, Paul A.

doi:10.1016/j.micromeso.2007.08.022

Cited by 280 publications

(208 citation statements)

References 15 publications

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“…The addition of barium resulted in an increase in the number of basic sites (ca. 2.5-fold), in agreement with results in the literature [Yang and Kim, 2010;Zhang and Singh, 2008], and in a 50% decrease of the surface area of Al-MCM-41 due to the formation of Ba 2 SiO 4 particles that block the entry of the channel structure of the mesoporuos silica. At the beginning of the catalytic tests at 573 K and W/F EtOH = 15 g h mol -1 (Figure 6b), the ethanol conversion was 66% and the selectivity for ethylene was 38% and for diethyl ether 56%.…”

Section: Characterizationsupporting

confidence: 91%

“…In previous studies, it was reported that CO 2 can be absorbed irreversibly on OH -groups (basic sites) producing CO 3 2-and H 2 O species [Cheng et al, 1998]. Therefore, an increase of the catalyst basicity can be assigned to the alkali-earth properties of barium [Yang and Kim, 2010;Zhang and Singh, 2008] and to the tendency to form carbonates on the chromium surfaces [Seiferth et al, 1999;Kuhlenbeck et al, 1992]. Figure 4 shows the IR transmission spectra of samples in the range 4000-400 cm -1…”

Section: Characterizationmentioning

confidence: 99%

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VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

La-Salvia

Lovón-Quintana

Valença

2015

Braz. J. Chem. Eng.

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-Al-MCM-41, 16%Ba/Al-MCM-41 and 1.4%Cr-16%Ba/Al-MCM-41 were used as catalysts in the vapor-phase catalytic conversion of ethanol. Physical-chemical properties of the catalysts and the effect of barium and chromium on the Al-MCM-41 activity and 1,3-butadiene yield were studied. The catalysts were characterized by X-ray diffraction (XRD), N 2 physisorption (BET method), CO 2 chemisorption and Fourier transform infrared spectroscopy (FT-IR). When ethanol was completely converted on Al-MCM-41 and 16%Ba/Al-MCM-41, the reaction products showed a high selectivity for ethylene (90-98%). However, on the 1.4%Cr-16%Ba/Al-MCM-41 catalyst, a greater number of reaction products were obtained such as ethylene, acetaldehyde, diethyl ether and 1,3-butadiene. The maximum 1,3-butadiene yield obtained from ethanol reaction was 25% at 723 K and W/F EtOH = 15 g h mol -1 . The latter result was obtained in a single step and without addition of reaction promoters (e.g., acetaldehyde, crotonaldehyde, hydrogen) in the feed stream to the reactor.

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Section: Characterizationsupporting

confidence: 91%

Section: Characterizationmentioning

confidence: 99%

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

La-Salvia

Lovón-Quintana

Valença

2015

Braz. J. Chem. Eng.

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“…In this study, we focus on the amine-decorated 12-connected porous metal-organic framework CAU-1 (CAU, for ChristianAlbrechts-University) or Al 4 (OH) 2 (OCH 3 ) 4 (H 2 N-BDC) 3 . This MOF can be easily synthesized from nonexpensive primary compounds, also on a large scale.…”

Section: Introductionmentioning

confidence: 99%

High and selective CO2 uptake, H2 storage and methanol sensing on the amine-decorated 12-connected MOF CAU-1

Jiao

Fen

et al. 2011

Energy Environ. Sci.

242

113

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The amine-decorated microporous metal-organic framework CAU-1 was readily synthesized and activated using a home-made efficient protocol. It exhibited a high heat of adsorption for CO 2 , high CO 2 uptake capacity, and an impressive selectivity for CO 2 over N 2 . At 273 K and up to 1 atm, CO 2 uptake capacity can reach as much as 7.2 mmol g À1 . Comparatively, the CH 4 and N 2 uptakes at 273 K and 1 atm were only 1.34 mmol g À1 and 0.37 mmol g À1 , respectively. The CO 2 /N 2 selectivity was 101 : 1 at 273 K. The isosteric heat of adsorption (Q st ) for CO 2 was $48 kJ mol À1 at the onset of adsorption, and it decreases to $28 kJ mol À1 at higher CO 2 pressures. Furthermore, CAU-1 can adsorb 2.0 wt% and 4.0 wt% hydrogen at 77 K under 1 atm and 30 atm, respectively. The adsorption characteristics of CAU-1 for methanol investigated in situ with a quartz crystal microbalance (QCM), indicated that this particular MOF structure can be used as a highly sensitive sensor for methanol detection such as direct methanol fuel cells. Recently, the basic properties of amine functionalized MOF were tested in Knoevenagel condensation reactions, 14,15 and Couck et al. 16 found that at low surface coverage, the CO 2 /CH 4 selectivity of the amine functionalized MIL-53(Al) was larger than that of the parent MIL-53(Al).

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“…For the latter one, there are four main approaches: cryogenic distillation, membrane purification, absorption with liquids [2], and adsorption using solids [3,4]. Using solid adsorbent is widely considered, such as zeolites [5,6], activated carbons [7,8], metal oxides [9,10], and supported amines [11].…”

mentioning

confidence: 99%

Graphene-manganese oxide hybrid porous material and its application in carbon dioxide adsorption

et al. 2012

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Alkali and alkaline-earth cation exchanged chabazite zeolites for adsorption based CO2 capture

Cited by 280 publications

References 15 publications

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

High and selective CO2 uptake, H2 storage and methanol sensing on the amine-decorated 12-connected MOF CAU-1

Graphene-manganese oxide hybrid porous material and its application in carbon dioxide adsorption

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