摘要:
For reducing nitrogen oxides during the steam reformation, wherein a gaseous carbon carrier, preferably natural gas, and water are reacted in a reactor to obtain a synthesis gas containing hydrogen, carbon monoxide and carbon dioxide, hydrogen, carbon monoxide and/or carbon dioxide are separated from the synthesis gas and the flue gas obtained in the reactor is passed over at least one catalyst stage and subjected there to a selective catalytic reduction. A part of the gaseous carbon carrier, a part of a mixture of the gaseous carbon carrier and water, a part of a gaseous fuel utilized for heating, a part of the synthesis gas, a part of the depleted synthesis gas and/or a part of the separated hydrogen is/are used in the catalyst stage as reducing agent.
摘要:
The invention relates to a method for reducing the tar content in gases resulting from a thermochemical gasification process of carbon-containing starting material and comprises the contacting of at least a part of the gas obtained from the gasification process with a catalyst containing noble metals. The invention is characterized in that the gas to be treated is not brought into contact with a catalyst on zirconium basis prior to the contact with the catalyst containing noble metals. The catalyst containing noble metals comprises at least one noble metal selected from the group consisting of Pt, Pd, Rh, Ir, Os, Ru and Re, provided that in the case of Pt, said element is used in combination with at least one further noble metal or Ni.
摘要:
A process for the catalytic removal of hydrogen cyanide, formic acid and formic acid derivatives from synthesis gas comprising these compounds, carbon monoxide and hydrogen, the process comprising contacting the synthesis gas with a catalyst comprising one or more metals selected from the group consisting of silver, gold, copper, palladium, platinum and their mixtures and supported on a carrier comprising at least one of the oxides of scandium, yttrium, lanthanum, cerium, titanium, zirconium, aluminium, zinc, chromium and molybdenum.
摘要:
Disclosed herein is an external, fixed bed, agglomerated nano catalyst of the general formula; AxByOz/Qn. (OH)m where, 'A' represents transition element 'B' represents rare earth elements including the lanthanide series, and actinide series either alone or mixture thereof in metallic or oxide or as hydroxides; 'Q' represents montmorillonate clay or its derivatives; and optionally along with an organic binder; for conversion of various homogeneous arid heterogeneous waste material into useful hydrocarbon fuel as oil, gas and as solid carbon.
摘要:
Procédé d'élimination ultime d'impuretés soufrées, azotées et halogénées contenues dans un gaz de synthèse, ledit procédé comprenant : a) une étape conjointe d'hydrolyse de COS et HCN contenus dans le gaz et de captation des composés halogènes, utilisant un catalyseur à base de TiO 2 , b) une étape de lavage par un solvant, c) une étape de désulfuration sur une masse de captation ou adsorbant. Le gaz de synthèse purifié selon ce procédé de l'invention contient moins de 10 ppb poids, moins de 10 ppb poids d'impuretés azotées et moins de 10 ppb poids d'impuretés halogénées.
摘要:
Ein Verfahren zur Verringerung des Teergehalts in Gasen aus einem thermochemischen Vergasungsprozess von kohlenstoffhaltigen Ausgangsmaterial umfasst das Kontaktieren mindestens eines Teils des aus dem Vergasungsprozess erhaltenen Gases mit einem edelmetallhaltigen Katalysator. Der edelmetallhaltige Katalysator umfasst mindestens zwei Edelmetalle, ausgewählt aus der Gruppe, bestehend aus Pt, Pd, Rh, Ir, Os, Ru und Re.
摘要:
A fuel cell power plant (110) has a fuel cell stack assembly (CSA) (16) including an anode (18), and a fuel processing system (FPS) (120) providing a hydrogen-rich reformate/fuel stream (34, 134, 62) for the anode (18) of the CSA (16). A relatively active metal catalyst is associated with one or both of the anode (18) and the FPS (120), and is subject to degradation by the presence of even low levels, e. g. 100 ppb to 5 ppb-wt. reformate, of sulfur in the fuel stream. A guard bed (70) containing a guard material (72) is provided in the FPS (120) for protecting the relatively active metal catalysts by adsorbing, and further reducing the level of, sulfur in the fuel stream. The guard material (72) is a metal or metal oxide capable of forming a stable sulfide in the presence of low levels of H 2 s in the fuel stream (34), and is preferably selected from the group consisting of: ZnO, CuO on CeO 2 -based support, NiO on CeO 2 -based support, and Cu/ZnO. Provision is also made (80, 74, 75, 76, 78, 82) for regenerating the guard material (72) in situ.