Aluminophosphate-17 and silicoaluminophosphate-17 membranes for CO2 separations

Zhong, Shengwen; Bu, Na; Zhou, Rongfei; Jin, Wanqin; Yu, Miao; Li, Shiguang

doi:10.1016/j.memsci.2016.08.010

Cited by 50 publications

(30 citation statements)

References 28 publications

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“…Recently, the molecular sieve properties of SAPO-17 and AlPO-17 have been demonstrated for CO 2 /CH 4 and CO 2 /N 2 mixtures. 54 Another potential candidate to effectively separate N 2 /CH 4 via molecular sieving is the zeolite DNL-6. This zeolite is composed of a-cages linking through 8-rings pore size of 0.36 Â 0.36 nm having a body-centered cubic symmetry structure of RHO.…”

Section: A Novel Membrane Compositionsmentioning

confidence: 99%

Molecular sieve membranes for N₂/CH₄separation

Carreón

2017

J. Mater. Res.

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Natural gas consumption has grown from 5.0 trillion cubic feet (TCF) in 1949 to 27.0 TCF in 2014 and is expected to be ;31.6 TCF in 2040. This large demand requires an effective technology to purify natural gas. Nitrogen is a significant impurity in natural gas and has to be removed since it decreases the natural gas energy content. The benchmark technology to remove nitrogen from natural gas is cryogenic distillation, which is costly and energy intensive. Membrane technology could play a key role in making this separation less energy intensive and therefore economically feasible. Molecular sieve membranes are ideal candidates to remove natural gas impurities because of their exceptional size-exclusion properties, high thermal and chemical resistance. In this review, the state of the art of molecular sieve membranes for N 2 /CH 4 separation, separation mechanisms involved, and future directions of these emerging membranes for natural gas purification are critically discussed. I. NATURAL GAS GENERALITIESThe United States is the world's largest producer of natural gas.1 As of 2015, the United States produces 28.8 trillion cubic feet (TCF) of natural gas per year.2 The United States natural gas production has been increasing every year since 2010, 3 and this increase in production can, in part, be contributed to the increasing use of fracking and other technologies that release previously untapped natural gases in shale.3 According to US Energy Information Administration, the natural gas consumption is expected to rise to 31.6 TCF in 2040. 4 Processing of natural gas is by far the largest industrial gas separation application. 5 Every year close to 100 trillion standard cubic feet of natural gas are used worldwide. This large demand requires an effective technology to process and purify natural gas.Natural gas consists primarily of methane, higher alkanes, carbon dioxide, nitrogen, and hydrogen sulfide as shown in Table I. In particular CO 2 and N 2 decrease the heat value of the natural gas. Therefore, it is highly desirable to remove CO 2 and N 2 from natural gas to improve its heat content, and to avoid the erosion of pipelines from CO 2 in the presence of moisture.Approximately 14% of US natural gas contains .4% N 2 .5 However, most pipeline standards require that natural gas contains less than 4% inert gases. N 2 dilutes the heating value of the gas, resulting in lower British thermal units. In the process of purification, it is highly desirable to maintain the gas at high pressure when explored to save recompression costs. In this respect, it is necessary to develop efficient processes to remove N 2 from natural gas. II. NATURAL GAS NITROGEN REJECTION TECHNOLOGIESNitrogen rejection is a challenging technical separation because of the similar molecular size of N 2 (;0.36 nm) His research focuses on molecular gas separations, heterogeneous catalysis, and gas storage, and aims at tackling relevant societal issues related to energy and environment, including carbon dioxide capture and utilization, biomass convers...

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Section: A Novel Membrane Compositionsmentioning

confidence: 99%

Molecular sieve membranes for N₂/CH₄separation

Carreón

2017

J. Mater. Res.

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“…Similar trends in CO 2 /CH 4 separation were observed in randomly oriented SAPO‐34 [ 10g ] and SAPO‐17 membranes. [ 19 ] The current [100]‐oriented SAPO‐34 nanofilm displayed CO 2 permeance as high as 5.3 × 10 −6 mol (m 2 s Pa) −1 and CO 2 /CH 4 selectivity of 44.0 at 1.0 MPa. Separation performance of the current nanofilm could be further improved when concentration polarization was alleviated by increasing the feed flow rate.…”

Section: Introductionmentioning

confidence: 99%

“…Comparison of separation performance of our oriented SAPO‐34 nanofilms with other zeolite films/membranes presented in a) CO 2 /CH 4 selectivity versus permeance and b) CO 2 /N 2 selectivity versus permeance plots. AlPO‐18, [ 5c,15,18,21 ] ● DDR, [ 22 ] ▼ CHA, [ 17c,20b,23 ] ▽ SSZ‐13, [ 18a,b,24 ] △ MFI, [ 25 ] ▲ FAU, [ 26 ] SAPO‐17, [ 19 ] and ■ SAPO‐34 [ 10b,27 ] films/membranes.…”

Section: Introductionmentioning

confidence: 99%

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Wang

et al. 2020

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Precise molecular and ion separations depend largely on the size and uniformity of the nanochannels in a defect-free microporous nanofilm. Ordered and perpendicular nanochannels with uniform pore size are assembled into a continuous and defect-free film by a "gel nuclei-less" route. The ultrathin (<50 nm) zeolite nanosheets seeding layer induces the formation of defectfree zeolite nanofilms (500-800 nm) with preferential [100] orientation well-aligned to the transport pathway. The large-area and thin silicoaluminophosphate-34 (SAPO-34) nanofilm consisting of uniform and straight nanochannels shows a milestone CO 2 permeance of ≈1.0 × 10 −5 mol (m 2 s Pa) −1 and high CO 2 /CH 4 and CO 2 /N 2 selectivities of 135 and 41 in equimolar binary mixtures at room temperature and 0.2 MPa feed pressure, respectively. These results suggest that highly oriented and thin SAPO-34 nanofilms prepared from nanosheets might have great potential for CO 2 capture from natural gas, biogas, and flue gas.

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“…22 In addition to studies aiming at the use of AlPOs/SAPOs in adsorption-based separations, some groups have also prepared AlPO or SAPO membranes for potential applications in separations of methane-containing mixtures. [24][25][26][27][28][29][30][31][32][33][34][35] These efforts have mainly addressed frameworks with eight-membered ring pore apertures, especially AEI-type AlPO-18 and CHA-type SAPO-34, because the diffusion of CO 2 or N 2 (kinetic diameters d kin of 3.30 Å and 3.64 Å, respectively 3 ) through these windows is faster than the diffusion of CH 4 (d kin = 3.80 Å). Since CO 2 is more strongly adsorbed than CH 4 , the combination of stronger adsorption and faster diffusion of carbon dioxide affords high CO 2 /CH 4 membrane selectivities: For example, Wang et al…”

Section: Introductionmentioning

confidence: 99%

Porous aluminophosphates as adsorbents for the separation of CO₂/CH₄and CH₄/N₂mixtures – a Monte Carlo simulation study

Fischer

2018

Sustainable Energy Fuels

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Aluminophosphate-17 and silicoaluminophosphate-17 membranes for CO2 separations

Cited by 50 publications

References 28 publications

Molecular sieve membranes for N₂/CH₄separation

Molecular sieve membranes for N₂/CH₄separation

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Porous aluminophosphates as adsorbents for the separation of CO₂/CH₄and CH₄/N₂mixtures – a Monte Carlo simulation study

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Aluminophosphate-17 and silicoaluminophosphate-17 membranes for CO2 separations

Cited by 50 publications

References 28 publications

Molecular sieve membranes for N2/CH4separation

Molecular sieve membranes for N2/CH4separation

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO2 Separation

Porous aluminophosphates as adsorbents for the separation of CO2/CH4and CH4/N2mixtures – a Monte Carlo simulation study

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Molecular sieve membranes for N₂/CH₄separation

Molecular sieve membranes for N₂/CH₄separation

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Porous aluminophosphates as adsorbents for the separation of CO₂/CH₄and CH₄/N₂mixtures – a Monte Carlo simulation study