Shape-selective catalysts for Fischer-Tropsch chemistry : iron-containing particulate catalysts. Activity report : January 1, 2001 - December 31, 2004.

Cronauer, Donald C.

doi:10.2172/928626

Cited by 1 publication

(5 citation statements)

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“…Runs 85A, 85C, 87C and 85F were made at mid-bed temperatures ranging between 265° and 290°C. As shown in the previous report 15 there was only a nominal level (<0.05%) of methane generated in one of these runs and 0.02 % or less in the other runs. No other hydrocarbons or carbon dioxide were detected at levels at or above 0.01%.…”

Section: B α-Aluminasupporting

confidence: 60%

“…Experiments with the "coarse" CAER catalyst, designated 72 CAER, were carried out at reaction temperatures between 267° and 290°C. The activity of the coarse CAER catalyst was equivalent to that of asreceived CAER catalyst with the exception that nominally more CO 2 was generated (see the previous report 15 ). In order to rapidly evaluate the catalytic membranes, the ALD coating processes were performed in an 'exploratory mode' in which ALD procedures from the literature appropriate for coating flat surfaces were applied to the high surface area membranes.…”

Section: B α-Aluminamentioning

confidence: 85%

“…The following interim observations/conclusions were stated in the previous project report: 15 1. Iron-based catalysts can be prepared at ANL using the techniques outlined in the CAER reports, but a high degree of mixing must be introduced to generate more uniform particle sizes.…”

Section: Interim Observations/conclusionmentioning

confidence: 86%

“…Selected CAER catalyst samples were separated by differential settling to isolate fractions of differing particle diameter as described in the previous report. 15 As-received iron-containing CAER FT catalyst was used in Runs 100 and 101, made at 268° and 284°C, respectively. With catalyst charges of about 0.70 g, 35 and 57% CO conversion levels were observed at mid-bed temperatures of 268° and 284°C, respectively.…”

Section: B α-Aluminamentioning

confidence: 99%

“…The progress report covering this research stage has been issued. 15 The goal of the current stage of this project is directed toward preparing active FT catalysts supported on porous membranes. Specifically, emphasis is being directed toward preparing thin films of catalytic metals supported on tightly controlled porous membranes.…”

Section: Introductionmentioning

confidence: 99%

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Shape-selective catalysts for Fischer-Tropsch chemistry : atomic layer deposition of active catalytic metals. Activity report : January 1, 2005 - September 30, 2005.

Cronauer¹

2011

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SummaryArgonne National Laboratory is carrying out a research program to create, prepare, and evaluate catalysts to promote Fischer-Tropsch (FT) chemistry-specifically, the reaction of hydrogen with carbon monoxide to form long-chain hydrocarbons. In addition to needing high activity, it is desirable that the catalysts have high selectivity and stability with respect to both mechanical strength and aging properties. The broad goal is to produce diesel fraction components and avoiding excess yields of both light hydrocarbons and heavy waxes. Originally the goal was to prepare shapeselective catalysts that would limit the formation of long-chain products and yet retain the active metal sites in a protected "cage." Such catalysts were prepared with silica-containing fractal cages. The activity was essentially the same as that of catalysts without the cages. We are currently awaiting follow-up experiments to determine the attrition strength of these catalysts.A second experimental stage was undertaken to prepare and evaluate active FT catalysts formed by atomic-layer deposition [ALD] of active components on supported membranes and particulate supports. The concept was that of depositing active metals (i.e. ruthenium, iron or cobalt) upon membranes with well defined flow channels of small diameter and length such that the catalytic activity and product molecular weight distribution could be controlled. In order to rapidly evaluate the catalytic membranes, the ALD coating processes were performed in an 'exploratory mode' in which ALD procedures from the literature appropriate for coating flat surfaces were applied to the high surface area membranes. Consequently, the Fe and Ru loadings in the membranes were likely to be smaller than those expected for complete monolayer coverage. In addition, there was likely to be significant variation in the Fe and Ru loading among the membranes due to difficulties in nucleating these materials on the aluminum oxide surfaces.The first series of experiments using coated membranes demonstrated that the technology needed further improvement. Specifically, observed catalytic FT activity was low. This low activity appeared to be due to: 1. low available surface area, 2. atomic deposition techniques that needed improvements, and 3. insufficient preconditioning of the catalyst surface prior to FT testing. Therefore, experimentation was expanded to the use of particulate silica supports having defined channels and reasonably high surface area. This later experimentation will be discussed in the next progress report. Subsequently, we plan to evaluate membranes after the ALD techniques are improved with a careful study to control and quantify the Fe and Ru loadings. The preconditioning of these surfaces will also be further developed. (A number of improvements have been made with particulate supports; they will be discussed in the subsequent report.)In support of the above, there was an opportunity to undertake a short study of cobalt/promoter/support interaction using the Advanced Photon Sou...

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Section: B α-Aluminasupporting

confidence: 60%

Section: B α-Aluminamentioning

confidence: 85%

Section: Interim Observations/conclusionmentioning

confidence: 86%

Section: B α-Aluminamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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