Carbon nanofibers in catalytic membrane microreactors

Aran, H.C.; Benito, Sergio Pacheco; Luiten-Olieman, Mieke W.J.; Er, Süleyman; Weßling, Matthias; Lefferts, Leon; Benes, Nieck E.; Lammertink, Rob G.H.

doi:10.1016/j.memsci.2011.07.037

Cited by 27 publications

(27 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An unexpected finding is that nitrite removal still reached 9.83% within the 10 h operation period when only air was sparged into the nitrite solution. The nitrite conversion in the absence of hydrogen gas can be attributed to the formation of metal hydride phases and the reductive properties of metallic iron (Fe 0 ) particles . During the formation of CNTs and the reduction of the membrane catalyst, the metal particles including Fe and Pd were exposed to H 2 gas at elevated temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…In operation, one reactant is fed through the support to the catalytic layer while the gas reactant is dissolved in liquid and diffuses to the catalyst surface from the opposite side of the membrane. Thereby, effective contact between the two reactants and the solid catalyst is established, and the diffusion pathways can be significantly shortened . In order to expel the mass transport limitation by the pore diffusion, a ‘flow‐through’ operation can be performed for rapid gas–liquid–solid reactions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al₂O₃hollow fiber membrane reactor

Zhao

Tong

Tan

2015

J. Chem. Technol. Biotechnol.

View full text Add to dashboard Cite

BACKGROUND Nitrite contaminants in groundwater endanger public health since they may cause many diseases such as blue baby syndrome, cancer and hypertension. In this work, novel Pd‐CNTs/Al2O3 catalytic hollow fiber membranes for aqueous nitrite hydrogenation reduction were fabricated by the deposition of carbon nanotubes (CNTs) and Pd nanoparticles inside porous Al2O3 hollow fibers. A hollow fiber membrane reactor was assembled for nitrite removal from water by catalytic hydrogenation reduction. RESULTS Experimental results indicated that the nitrite hydrogenation rate was highly dependent on hydrogen dissolution in water and adsorption on the catalyst. The nitrite removal increased with increasing H2 partial pressure to balance the nitrite solution, but the influence became very marginal as it approached 1.0 atm. The oxygen in the gas feed lowered the nitrite removal due to the reaction with dissolved hydrogen over the Pd‐catalyst. Compared with the conventional diffusion operation of the membrane reactor, the ‘flow‐through’ operation resulted in higher nitrite removals due to the intensified mass transfer rate. CONCLUSION The nitrites in water can be completely removed using the Pd‐CNTs/Al2O3 membrane reactor with flow‐through operation. The denitrification should be operated at around 25°C for large reaction kinetics, which is determined by both the temperature and the hydrogen solubility in water. © 2015 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al₂O₃hollow fiber membrane reactor

Zhao

Tong

Tan

2015

J. Chem. Technol. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…92 Porous stainless steel hollow fibers with high porosity and mechanical strength were fabricated, and CNFs with high surface area were successfully grown on the porous surface (Figure 10.11). Pd catalyst was then immobilized on the CNFs as a hydrogenation catalyst.…”

Section: Microreactormentioning

confidence: 99%

Engineering and Safety Issues

2015

Nanostructured Carbon Materials for Catalysis

View full text Add to dashboard Cite

show abstract

“…Schematic diagram of the catalytic hollow fibre membrane (a) with coated catalyst; 6 and (b) with impregnated catalyst, respectively …”

Section: Configurations and Fabrication Of Mmrmentioning

confidence: 99%

Membrane microreactors for catalytic reactions

Tan

2013

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Membrane microreactors (MMRs) combine the advantages of membrane separation and microreactors such as high area/volume ratio, enhanced mass and/or heat transfer, improved catalytic efficiency without equilibrium limitation, good operational safety and design flexibility. This article presents a short review of recent developments in MMRs and in particular highlights their applications in catalytic processing. The structure and fabrication of MMRs, the incorporation of catalysts with membranes, the flow characteristics as well as their applications in a variety of catalytic processes are presented. The prospects and challenges of MMRs in catalytic processing are also presented and discussed. © 2013 Society of Chemical Industry

show abstract

Carbon nanofibers in catalytic membrane microreactors

Cited by 27 publications

References 35 publications

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al₂O₃hollow fiber membrane reactor

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al₂O₃hollow fiber membrane reactor

Engineering and Safety Issues

Membrane microreactors for catalytic reactions

Contact Info

Product

Resources

About

Carbon nanofibers in catalytic membrane microreactors

Cited by 27 publications

References 35 publications

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al2O3hollow fiber membrane reactor

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al2O3hollow fiber membrane reactor

Engineering and Safety Issues

Membrane microreactors for catalytic reactions

Contact Info

Product

Resources

About

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al₂O₃hollow fiber membrane reactor

Nitrite removal from water by catalytic hydrogenation in a Pd-CNTs/Al₂O₃hollow fiber membrane reactor