A study is conducted to demonstrate catalytic dehydrogenation of light alkanes on metals and metal oxides. The study provides a complete overview of the materials used to catalyze this reaction, as dehydrogenation for the production of light olefins has become extremely relevant. Relevant factors, such as the specific nature of the active sites, as well as the effect of support, promoters, and reaction feed on catalyst performance and lifetime, are discussed for each catalytic Material. The study compares different catalysts in terms of the reaction mechanism and deactivation pathways and catalytic performance. The duration of the dehydrogenation step depends on the heat content of the catalyst bed, which decreases rapidly due to the endothermic nature of the reaction. Part of the heat required for the reaction is introduced to the reactors by preheating the reaction feed, additional heat being provided by adjacent reactors that are regenerating the coked catalysts.

Catalytic dehydrogenation of light alkanes on metals and metal oxides.

Recent advances on membranes and membrane reactors for hydrogen production

Correlations in palladium membranes for hydrogen separation: A review

Membrane reactors applied to catalytic reactions are currently being studied in many places world-wide. Significant developments in membrane science and the vision of process intensification by multifunctional reactors have stimulated a lot of academic and industrial research, which is impressively demonstrated by more than 100 scientific papers on catalytic membrane reactors being published per year. Palladium as a noble metal with exceptional hydrogen permeation properties and, at the same time, broad applicability as a catalyst, first of all for hydrogenation, is part of many of these developments. This paper discusses two different membrane reactor concepts which both rely on supported palladium, on the one hand as a permselective membrane material, and on the other hand as base component of a membrane-type hydrogenation catalyst. Dense palladium composite membranes can be used for hydrogen separation from packed-bed catalysts in gas-phase hydrocarbon dehydrogenation reactions. Mesoporous membranes containing dispersed bimetallic Pd/X-clusters can be employed as so-called catalytic diffusers for liquid-phase hydrogenation, e.g. of nitrate and nitrite in water. The principles of both concepts are introduced, recently obtained experimental data are evaluated in connection with literature results, and the perspectives for further development are highlighted.

Membrane reactors for hydrogenation and dehydrogenation processes based on supported palladium

Zeolite based films, membranes and membrane reactors: Progress and prospects

Studies on the use of catalytic membranes for reduction of nitrate in drinking water

CVD preparation of catalytic membranes for reduction of nitrates in water

Method for removing nitrate, nitrite, perchlorate and other toxic compounds from unpurified water comprises reacting water with a gas mixture of hydrogen and carbon dioxide in the pore structure of the ceramic membrane of a contactor covered with a covering layer containing catalytically active metals. Independent claims are also included for: (1) a catalytic contactor comprising palladium and tin deposited on the surface of ceramic tubular membranes by stepwise impregnation; and (2) a method for producing a contactor consisting of depositing tin in the first step and palladium in the second step.

Method used in drinking water treatment for removing toxic compounds from unpurified water comprises reacting water with a mixture of hydrogen and carbon dioxide in the pore structure of the ceramic membrane of a catalytic contactor

Kristian Daub

Papers

Membrane reactors for hydrogenation and dehydrogenation processes based on supported palladium

Studies on the use of catalytic membranes for reduction of nitrate in drinking water

CVD preparation of catalytic membranes for reduction of nitrates in water

Method used in drinking water treatment for removing toxic compounds from unpurified water comprises reacting water with a mixture of hydrogen and carbon dioxide in the pore structure of the ceramic membrane of a catalytic contactor