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Journal ArticleDOI

Modeling a catalytic polymeric non-porous membrane reactor

30 Jan 2001-Journal of Membrane Science (Elsevier)-Vol. 181, Iss: 2, pp 241-252
TL;DR: In this paper, a theoretical study on a catalytic polymeric non-porous membrane reactor is performed, where the conversion enhancement over the thermodynamic equilibrium is studied when conducting an equilibrium gas-phase reaction of the type A+B⇔C+D. The model used considers perfectly mixed flow patterns and isothermal operation for the retentate and permeate.
About: This article is published in Journal of Membrane Science.The article was published on 2001-01-30. It has received 31 citations till now. The article focuses on the topics: Thiele modulus & Sorption.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the possibility to increase CO2 conversion into methanol with respect to a traditional catalytic system using a zeolite membrane reactor (MR).
Abstract: Conversion of CO2 into methanol by catalytic hydrogenation has been recognised as one of the most promising processes for stabilising the atmospheric CO2 level, and furthermore the methanol produced could be used as fuel or basic chemical for satisfying the large demand world-wide. The purpose of this study is to investigate the possibility to increase CO2 conversion into methanol with respect to a traditional catalytic system. A zeolite membrane reactor (MR), able to combine catalytic reaction with separation properties of zeolite membranes, is considered. A comparison among results of this work and literature data for both the membrane reactor and the traditional one in terms of CO2 conversion, methanol selectivity and methanol yield, at feed ratio H2/CO2=3 and 7, shows that using a zeolite membrane reactor it is possible to obtain higher conversion of CO2 and both higher methanol selectivity and methanol yield with respect to a traditional reactor (TR).

173 citations

Journal ArticleDOI
TL;DR: A review on the preparation and application of polymeric membranes in the field of fine chemicals with adequate performance in catalysis both in gas phase and liquid phase reactions is presented and discussed in this paper.
Abstract: The study of catalytic membranes is a multidisciplinary activity, which in recent years has attracted the attention of scientists in a number of disciplines, including material science, chemistry and chemical engineering. Membrane based reactive separation processes, which seek to combine two distinct functions, i.e. reaction and separation, have been around as a concept since the early stages of the membrane field, itself, but have only attracted substantial technical interest the last decade or so. According to the literature, most studies combining membranes and catalysts concern gas phase reactions at relatively high temperature. In most of these applications inorganic membrane made from ceramic or metals are applied. Polymeric membranes (porous or dense) are used when the reaction temperatures are lower, i.e. in the field of fine chemicals or when biocatalysts are present. Dense polymeric membranes in use to separate gases or liquids from mixtures by a sorption–diffusion mechanism can be coupled to catalytic reaction and then be used to separate and react in one step. The polymeric membrane should be not only highly selective, but it should also be permeable enough to give a sufficient separation. Liquid phase catalytic reactions are involved in numerous industrial processes ranging from fine to bulk chemical synthesis; polymeric membranes may also play a significant role in this field. In this paper, a review on the preparation and application of polymeric membranes in the field of fine chemicals with adequate performance in catalysis both in gas phase and liquid phase reactions is presented and discussed.

155 citations

Journal ArticleDOI
TL;DR: In this article, an experimental and modeling study is described, focusing on the performance of a Pd-Ag membrane reactor recently proposed and suitable for the production of ultra-pure hydrogen, for some operating conditions clearly above the maximum limit for conventional packed bed reactors.

68 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of the hydrophobic/hydrophilic properties of polyvinyl alcohol membranes on the catalytic activity was studied, and a diffusion-kinetic model was developed in an attempt to explain the induction period observed in the kinetic curves.

57 citations

References
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Book
01 Jan 1980

777 citations

Journal ArticleDOI
TL;DR: In this paper, an extensive review of the literature dealing with the class of catalytic membrane reactors which involves hydrogen permeable membranes made of palladium and palladium alloys is presented.
Abstract: This paper is an extensive review of the literature dealing with the class of catalytic membrane reactors which involves hydrogen permeable membranes made of palladium and palladium alloys. The fundamental factors which affect hydrogen permeability are first discussed. A classification of the many reactions which have been conducted in such reactors at both laboratory and commercial scales is then presented. The various techniques for the preparation of palladium- based membranes are described and the literature on modeling and design of these reactors is also reviewed.

651 citations

Journal ArticleDOI
TL;DR: An understanding of various membrane functions will be quite useful in future development and commercialization of membrane reactors, and develops a functional perspective for membranes in a variety of reaction processes.
Abstract: Membrane reactors have found utility in a broad range of applications including biochemical, chemical, environmental, and petrochemical systems. The variety of membrane separation processes, the novel characteristics of membrane structures, and the geometrical advantages offered by the membrane modules have been employed to enhance and assist reaction schemes to attain higher performance levels compared to conventional approaches. In these, membranes perform a wide variety of functions, often more than one function in a given context. An understanding of these various membrane functions will be quite useful in future development and commercialization of membrane reactors. This overview develops a functional perspective for membranes in a variety of reaction processes. Various functions of the membranes in a reactor can be categorized according to the essential role of the membranes. They can be employed to introduce/separate/purify reactant(s) and products, to provide the surface for reactions, to provide...

167 citations

Journal ArticleDOI
TL;DR: In this paper, a palladium membrane reactor capable of working under an adiabatic condition was designed for coupling two conjugated reactions, and it was shown experimentally that generated heat due to the oxidation refluxed to the dehydrogenation side, heated up the catalyst layer and therefore enhanced the de-hydrogenation.

88 citations

Journal ArticleDOI
TL;DR: In this paper, a comparison is made between the performance of the CVI-silica membrane and a Pd/Ag membrane when used as the H2 selective membrane for the direct dehydrogenation of propane in a high-temperature catalytic membrane reactor.

86 citations