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David Liederman

Bio: David Liederman is an academic researcher from Mobil. The author has contributed to research in topics: Catalysis & Carbon monoxide. The author has an hindex of 4, co-authored 7 publications receiving 551 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors explained that two major concerns in the development of the methanol-to-gasoline (MTG) process are heat removal from the reactor and the formation of durene (1-,2-,4-,5-tetramethylbenzene).
Abstract: This paper explains that 2 major concerns in the development of the methanol-to-gasoline (MTG) process are heat removal from the reactor and the formation of durene (1-,2-,4-,5-tetramethylbenzene). Conversion of methanol to gasoline is highly exothermic (about 1510-1740 kJ/kg of methanol converted) and the adiabatic temperature rise would be almost 600C. Within Mobil, 2 types of reactor configurations were adopted for development: an adiabatic fixed-bed and a fluid-bed reactor. The fixed-bed reactor is ready for immediate commercialization and is more suitable for smaller scale operation. The fluid-bed reactor is under development and possesses the following potential advantages over the fixed-bed reactor: reaction heat removal is simplified by using the superior heat transfer characteristics of a fluid bed; when coupled with alkylation, the fluid bed gives a higher gasoline yield than the fixed bed; and constant catalyst activity, gasoline selectivity, and gasoline quality can be maintained with the fluid-bed operation. Fixed-bed is cyclic.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of thermal deactivation on the oxidation of carbon monoxide, propylene, propane and engine exhaust gas were measured using a platinum monolithic oxidation catalyst between 1400 and 2400 deg F.
Abstract: In this thermal deactivation study of a platinum monolithic oxidation catalyst between 1400 and 2400 deg F, the effects of the thermal treatments on the oxidation of carbon monoxide, propylene, propane and engine exhaust gas were measured. The catalysts were characterized by measurement of surface area, carbon monoxide and hydrogen chemsorptions, X-ray line broadening, and X-ray diffraction; surface morphology was examined by scanning electron micrography. Results relating to the growth of platimum crystallites, sintering of alumina, and solid-state phase changes are reported.

6 citations

Patent
27 Mar 1974
TL;DR: In this paper, the passing of carbonyl halide or a mixture of carbon monoxide and halogen, alone or in a carrier gas, over the catalyst reduces the CO-oxidation and hydrocarbonoxidation temperature to almost that of fresh catalyst.
Abstract: Oxidation catalysts containing platinum or other noble metal components used in automobile exhaust emission control are reactivated, after thermal deactivation, by subjecting the catalyst to a halogen-containing gas at a temperature of from 500°F. to about 1000°F. The passing of carbonyl halide or a mixture of carbon monoxide and halogen, alone or in a carrier gas, over the catalyst reduces the CO-oxidation and hydrocarbon-oxidation temperature to almost that of fresh catalyst. Carbonyl chloride or the carbon monoxide-chlorine mixture is preferred. This treatment may also be used in the reactivation of noble metal-containing reforming catalysts.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a review of the literature on NO catalysis is presented, focusing on the threeway catalyst system which simultaneously promotes the reduction of nitrogen oxides and the oxidation of carbon monoxide and hydrocarbons.
Abstract: This review covers the literature through 1991 on nitric oxide catalysis as applied to automobile exhaust systems. Attention is given to the threeway catalyst system which simultaneously promotes the reduction of nitrogen oxides and the oxidation of carbon monoxide and hydrocarbons. These systems have been used on most passenger cars in the United States since 1982. Prior to 1980, emission control catalysts were oxidation catalysts, and reduction in exhaust nitric oxide was achieved using engine modifications (i.e., exhaust gas recirculation). This review focuses on catalytic control of NO, for gasoline-fueled vehicles (not diesels and alternate fuels) and primarily on developments reported since 1982. The term NO, refers to both NO and NOz. The reader is referred to an earlier publication by the author for a general review of automobile catalytic converters [1] and to a review by Egelhoff [2] on the nitric oxide literature through 1980. The recent literature on NO, reduction in lean exhaust is c...

746 citations

Journal ArticleDOI
TL;DR: Catalytic NOx Abatement Systems for Mobile Sources: From Three-Way to Lean Burn after-Treatment Technologies is presented.
Abstract: Catalytic NOx Abatement Systems for Mobile Sources: From Three-Way to Lean Burn after-Treatment Technologies Pascal Granger* and Vasile I. Parvulescu* Unit e de Catalyse et de Chimie du Solide, UMR CNRS 8181, University of Lille 1, 59655 Villeneuve d’Ascq, France Department of Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, Romania, 412 Regina Elisabeta Boulevard, Bucharest 030016, Romania

628 citations

Journal ArticleDOI
TL;DR: A review of methanol-to-hydrocarbons processes which have reached industrial applications, either on a commercial or on a pilot plant scale, is given in this paper.

476 citations

Journal ArticleDOI
TL;DR: Structured catalysts are promising as far as elimination of these setbacks is concerned as discussed by the authors, however, conventional fixed-bed reactors have some obvious disadvantages such as maldistributions of various kinds (including a nonuniform access of reactants to the catalytic surface), high pressure drop in the bed, etc.
Abstract: The use of structured catalysts in the chemical industry has been considered for years. Conventional fixed-bed reactors have some obvious disadvantages such as maldistributions of various kinds (including a nonuniform access of reactants to the catalytic surface), high pressure drop in the bed, etc. Structured catalysts are promising as far as elimination of these setbacks is concerned. Two basic kinds of structured catalysts can be distinguished: Structural packings covered with catalytically active material, similar in design to those used in distillation and absorption columns and/or static mixers. Good examples of catalysts of this kind are those offered by Sulzer, clearly developed by Sulzer column packings and static mixers. As in packed beds, there is an intensive radial convective mass transport over the entire cross-section of these packings. Structural packing catalysts and the reactors containing them are, however, not within the scope of this review. Monolithic catalysts are continuou...

448 citations

Book
01 Apr 1983
TL;DR: The precise nature of these reactive C1 species is unknown at present and is the subject of lively debate as mentioned in this paper, and considerable diversity of current opinion will become apparent from the following account.
Abstract: The conversion of methanol to hydrocarbons is a remarkable reaction. The mechanism involves C-C bond formation from C1 fragments generated in the presence of certain acidic catalysts and reagents. The precise nature of these reactive C1 species is unknown at present and is the subject of lively debate. The considerable diversity of current opinion will become apparent from the following account.

361 citations