Catalytic Membrane Reactor for VOC Destruction 1

Kajama, Mohammed Nasir; Nwogu, Ngozi Claribelle; Gobina, Edward

doi:10.1007/978-981-10-1088-0_13

Cited by 2 publications

(3 citation statements)

References 46 publications

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“…This type of catalytically active membrane has not been tested in gas-solid-liquid reactions and liquid-solid reactions before. With such a reactor configuration, it is possible to achieve good feed stream distribution and an optimal usage of the catalytic material and can thus out-perform those catalytic membranes in which the catalytic material is impregnated as highly dispersed particles in the pores of the support (Pina, Menendez andSantamaria 1996, Kajama, Nwogu andGobina 2016). Work is underway at the Centre for Process Integration & Membrane Technology in the Robert Gordon University, UK to deploy these Pd/Al2O3 membrane catalysts for the deoxygenating of water for downhole injection for pressure maintenance and in other process applications.…”

Section: Gas Permeationmentioning

confidence: 99%

Preparation and characterization of palladium ceramic alumina membrane for hydrogen permeation

Orakwe

Shehu

Gobina

2019

International Journal of Hydrogen Energy

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In this study, a tubular palladium membrane has been prepared by an electroless plating method using palladium II chloride as a precursor with the intent of not having a completely dense film since its application does not require high hydrogen selectivity. The support used was a 15 nm pore sized tubular ceramic alumina material that comprise of 77% alumina and 33% titania. It has dimensions of 7 mm inner and 10mm outer diameters respectively. The catalyst was deposited on the outside tube surface using the electroless deposition process. The membrane was morphologically characterized using scanning electron microscopy/energy dispersive x-ray analysis (SEM/EDXA) and liquid nitrogen adsorption/desorption analysis (BET) to study the shape and nature of the palladium plating on the membrane. The catalytic membrane was then inserted into a tubular stainless-steel holder which was wrapped in heating tapes so as to enable the heating of the membrane in the reactor. The gases used for permeation tests comprised H2, N2, O2 and He. Permeation tests were out at 573 K and at pressure range between 0.05-1 barg. The results showed that hydrogen displayed a higher permeation when compared to other gases that permeated through the membrane and its diffusion is also thought to include solution diffusion through the dense portions of the palladium in addition to Knudsen, convective and molecular sieving mechanisms occurring through cracks and voids along the grain boundaries. While high hydrogen selectivity is critically important in connection with hydrogen purification for fuel cells and in catalytic membrane reactors used to increase the yield of thermodynamically limited reactions such as methane steam reforming and water-gas shift reactions whereby the effective and selective removal of the H2 produced from the reaction zone shifts the equilibrium, it is not so important in situations in which the membrane has catalytic activity such that it is possible to carryout the reaction in situations where the premixed reactants are forced-through the membrane on which the catalysts is attached. This type of catalytically active membranes is novel and has not been tested in gassolid-liquid reactions and liquid-solid reactions before. With such a reactor configuration, it is possible to achieve good feed stream distribution and an optimal usage of the catalytic material. The preparation and characterization of such membrane catalysts has gained increased interests in the process industries because it can be adapted to carryout the chemical reactions if one of the reactants is present in low concentration and an optimal reactant distribution results in a better utilization of the active catalytic material. However, there are concerns in terms of the high cost of palladium membranes and research on how to fabricate membranes with a very low content of the palladium catalyst is still ongoing. Work is currently underway to deploy the Pd/Al2O3 membrane catalysts for the deoxygenating of water for downhole injection for pressure maintenance...

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Section: Gas Permeationmentioning

confidence: 99%

Preparation and characterization of palladium ceramic alumina membrane for hydrogen permeation

Orakwe

Shehu

Gobina

2019

International Journal of Hydrogen Energy

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“…The deposition method employed was based on the evaporation-crystallization steps. This system named as "reservoir" technique which was proposed by ( [32][33][34][35][36]. The Al2O3 tube was dipped in a 10g/l H2PtCl6 precursor solution for 10 hours after it was dipped for 2 hours in deionised water.…”

Section: Catalytic Membrane Preparationmentioning

confidence: 99%

“…The Pt/γ-Al2O3 membrane was then dried at room temperature for 24 hours to favour evaporation from the inner side and deposition on the top layer. Metallic platinum was obtained after thermal treatment of the Pt/γ-Al2O3 membrane under flowing hydrogen at 400 0 C for at least 2hrs followed by nitrogen flow for 1hr at 400 0 C [35].…”

Section: Catalytic Membrane Preparationmentioning

confidence: 99%

Development and characterization of a catalytic membrane for volatile organic compound combustion

Kajama¹,

Yildirim²

2018

Nig. J. Tech.

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Platinum-alumina (Pt/γ-Al2O3) catalytic membranes were obtained using the reservoir technique for the combustion of volatile organic compounds (VOCs). The membranes were characterized by scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDXA) observation, Brunauer-Emmett-Teller (BET) measurement and gas permeation. Propane (C3H8) and n-butane (C4H10) combustion was obtained. Maximum VOC conversion for propane and n-butane of 93 and 48 (%) was achieved on 3.52wt% Pt catalyst at a temperature of 427 and 259 (0 C) and flow rates of between 185-222 and 295-379 (ml/min) without any changes in conversion. The combustion results of C3H8 and C4H10 corroborate with literature on Pt/γ-Al2O3 catalysts. The conversion was achieved using flow-through catalytic membrane reactor operating in the Knudsen flow regime.

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Catalytic Membrane Reactor for VOC Destruction 1

Cited by 2 publications

References 46 publications

Preparation and characterization of palladium ceramic alumina membrane for hydrogen permeation

Preparation and characterization of palladium ceramic alumina membrane for hydrogen permeation

Development and characterization of a catalytic membrane for volatile organic compound combustion

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