Accession Number : AD0476571


Title :   INVESTIGATION OF CATALYTIC REACTIONS FOR CO2 REDUCTION. PART 3. EVALUATION OF PRECIOUS METAL CATALYSTS


Descriptive Note : Interim rept. May-Nov 1964


Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH


Personal Author(s) : Thompson, Jr, Edward B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/476571.pdf


Report Date : Oct 1965


Pagination or Media Count : 42


Abstract : The precious metals of ruthenium, rhodium, and iridium were selected as the final group of catalyzing materials to be experimentally evaluated for effectiveness in promoting the catalytic reduction of carbon dioxide by hydrogen to methane and water. A catalytic reactor having a length to diameter ratio of 18 was designed, fabricated, and utilized for the experimental evaluation of these catalysts. The reactor processed 2.2 pounds of CO2 per day equivalent to a one-man daily output. The minimum temperature required to achieve the maximum CO2 conversion rate of 99% was 450 F and this occurred for the ruthenium catalyst. Conversion rates of 99 and 67% were obtained with the rhocium and iridium catalysts at temperatures 704 and 892 F, respectively. The 99% conversion rate for ruthenium held for the temperature range of 450 to 650 F. All reactions took place at 1 atmosphere pressure. The total weight of hydrogen required to reduce the 2.20 pounds of CO2 under these conditions is 0.39 pounds. Each of the three catalysts had reactor batch weights of approximately 253 to 258 grams. After completion of each experimental run at the pre-set temperature, the catalyst was examined for possible carbon deposition and physical deterioration. No evidence of either condition was noted for ruthenium and rhodium; the iridium catalyst, had been partially reduced at the higher experimental reaction temperatures. The report introduces discussions of the effect of quantitative factors such as catalyst particle size and shape on reaction yield.


Descriptors :   *CARBON DIOXIDE , *CATALYSTS , *TRANSITION METALS , ALUMINUM COMPOUNDS , CHEMICAL REACTIONS , DEGRADATION , DENSITY , EQUILIBRIUM(PHYSIOLOGY) , HYDROGEN , IRIDIUM , LOW TEMPERATURE , OXIDES , PARTICLE SIZE , REDUCTION , RHODIUM , RUTHENIUM , SPACECRAFT , VELOCITY


Subject Categories : Inorganic Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE