All issues
Successor
Volume 56, Issue 10
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
Koji Ouchi1977 Volume 56 Issue 10 Pages 779-802
Published: October 20, 1977
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThe analysis of extract of coal, hydrolysis, low temperature depolymerization, hydrogenolysis and oxydation of coal were reviewed.View full abstractDownload PDF (2958K) -
Etsuo Niki1977 Volume 56 Issue 10 Pages 804-810
Published: October 20, 1977
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS-Oxidative degradation of polymers has tbeen reviewed on the emphasis of utilization of waste plastics. Effects of oxygen on the rate and products of the thermal decomposition of polymers were first discussed. It was then shown that oxidation of polymers by molecular oxygen gives a mixture of quitea variety of products. Ozonation of polymers was suggested to be promissing for the production of carboxylic acids.View full abstractDownload PDF (913K) -
Takayoshi Kimura, Keiji Nishioka, Eiichi Kikuchi, Yoshiro Morita1977 Volume 56 Issue 10 Pages 811-817
Published: October 20, 1977
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe reactions of hydrocarbons in the presence of steam on basic catalysts such as calcium oxide were studied in a tubular flow reactor with a fixed catalyst bed at mainly 900°C.
Steam reforming to produce CO, CO2 and H2 catalytically proceeded in parallel with thermal cracking over the catalysts. The catalytic activity did not correspond to the rate of the reaction between steam and carbon deposited in the steam reforming, but it corresponded to that of reaction between steam and carbon deposited in the absence of steam.
Aliphatic hydrocarbons were somewhat less reactive than aromatics in the steam reforming on calcium oxide. While the rate of reaction between steam and carbon deposited from aliphatic and aromatic hydrocarbons was almost same with each other.The difference in the reactivity of aliphatic and aromatic hydrocarbons seems to be caused by the decrease of partial pressure of steam in the steam reforming of aliphatic hydrocarbons due to cracking, resulting in the decrease of the rate of reaction between steam and intermediate deposited carbon.View full abstractDownload PDF (886K) -
Shigeaki Kasaoka, Eiji Sasaoka, Kazutaka Senda1977 Volume 56 Issue 10 Pages 818-823
Published: October 20, 1977
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe catalytic reduction of NO with NH3 (NO+NH3+ (1/4) O2→N2+ (3/2) H2O) and the effect of SOx and H2O over V2O5, WO3, MoO3, SnO2, Cr2O3, Fe2 (SO4) 3 or Pt supported on TiO2 (anatase structure) were strudied by using a flow reactor at 250-500°C. Inlet gas concentration was 470 or 500 ppm NO-0 or 30 ppm NO2-0-1000 ppm NH3-0-10% O2-0 or 1000 ppm SO2-0 or 10% H2O-N2 dalanced and the space velocity was 4×104-1.33×105 hr-1 (mainly 8×104 hr-1). The catalysts consisting of V2O5-TiO2 were found to be highly active and stable doth in the presence and in the absence of SOx and H2O at above ca. 250°C Furthermore, it was proved that the addition of WO3 to V2O5-TIO2 catalysts (for example, 2.5% V2O5-7.5% WO3-TiO2) increase the activity, stability and selectivity for NO reduction at above ca. 350°C.View full abstractDownload PDF (781K) -
Takayoshi Kimura, Keiji Nishioka, Eiichi Kikuchi, Yoshiro Morita1977 Volume 56 Issue 10 Pages 824-827
Published: October 20, 1977
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe reactions of hydrocarbons (n-hexane, cyclohexane and benzene) in the presence of CO2 on calcium oxide were studied in a flow system under atmospheric pressure and mainly at 900°C.
Catalytic CO2 reaction on calcium oxide proceeded in parallel with thermal cracking.The production of CO in the n-hexane-CO2 reaction required reaction temperature above 850°C. It is due to the formation of calcium carbonate which is inactive for this reaction below this temperature.
The catalytic activity corresponded to the reactivity of carbon with CO2 deposited in the absence of CO2 rather than that of carbon deposited during the hydrocarbon-CO2 reaction.The results suggested that the hydrocarbon-CO2 reaction proceeded via highly reactive carbon deposited on the catalyst, as an intermediate.View full abstractDownload PDF (544K) -
Kiyotaka Sakai, Hiroshi Nakamura, Tadashi Shirotsuka, Zoshio Ueda1977 Volume 56 Issue 10 Pages 828-833
Published: October 20, 1977
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSEffects of bath temperature on the energy distribution were investigated in the submerged combnstion apparatus. Evaporation occured hardly at less than 50°C, but when the temperature rose above 50°C, evaporation efficiency became apparent.On the other hand, heating efficiency decreased as the bath temperature rose above 50°C.These experimental results showed good agreements with that of theoretical energy distribrution.View full abstractDownload PDF (765K) -
Shigeaki Kasaoka, Toru Yamanaka, Eiji Sasaoka1977 Volume 56 Issue 10 Pages 834-840
Published: October 20, 1977
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSFor the purpose to establish the reduction mechanism of NOx with NH3, the higher activity catalysts and the operation conditions, the reduction rates of NOx (NO+NO2) of different compositions over the various metal oxide (V2O5, WO3, MoO3, Cr2O3, Mn2O3, Fe2O3, Co3O4, NiO, CuO, ZnO) catalysts supported on TiO2 (average diameter: 1.0mm) were investigated together with the examination of the oxidation of NO to NO2with O2 the decomposition of NO2 to NO, etc.. The experiments were carried out using a flow reactor (I. D.: 12.0mm) at 250, 550°C. Inlet gas concentrations were 500ppmNOx (NO, NO2, NO-NO2 equimolal mixture)-0 or 350-4140ppmNH3 (mainly 667ppmNH3)-5%O2-0 or 10%H2O-N2 for the reduction of NOx, the oxidation of NO and the decomposition of NO2. The apace velocity was mainly 1.1×105hr-1.
It was found that the reduction rate of equimolal mixture of NO and NO2 over every metal oxide catalysts employed was markedly high and that the catalysts (V2O5, WO3, MoO3) with higher reduction activity for NO than that for NO2, the catalysts (Mn2O3, Co3O4, Cr2O3, NiO) with higher reduction activity for NO2 than that for NO and catalysts (Fe2O3, CuO, ZnO) with the similar activity for reduction of both NO and NO2 existed. However, the overall reactions were given by the following equations for every metal oxide catalyst.
For NO system: NO+NH3+ (1/4) O2→N2+ (3/2) H2O
For NO2 system: NO
2+ (4/3) NH3→ (7/6) N2+2H2O
For equirnolal mixture of NO-NO2 system: NO+NO2+2NH3→2N2+3H2O
Also, the correlation between the activity for NO-reduction with NH3 and that for NO-oxidation with O2 was not found from the apparent rate of NO2 gas-formation, but the correlation between the activity for NO2-reduction with NH3 and that for NO2-decomposition to NO was found.View full abstractDownload PDF (918K)
- |<
- <
- 1
- >
- >|