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Optical emission spectra analysis of thermal plasma treatment of poly(vinyl chloride)

100%

Fazekas P., Keszler A. M., Bódis E., Drotár E., Klébert S., Károly Z., Szépvölgyi J.

Open Chemistry

2015

vol. 13

issue 1

Decomposition of poly(vinyl chloride) (PVC) was investigated in radiofrequency thermal plasma in neutral, oxidative and reductive conditions. Optical emission spectroscopy (OES) was applied for the characterization of the plasma column. OES was used to identify active plasma components such as excited atoms, ions, radicals and molecules. The spectra were dominated by molecular C2, CN, OH, and CH bands, and atomic H, Ar, C, Cl and O lines. Emission intensities of main species were monitored versus various experimental parameters. The rotational-vibrational temperatures determined from different bimolecular species were considered in the range of 2000–6400 K. Solid soot samples were collected and purified to investigate the possibility of graphene formation as a by-product of the decomposition process.

Acetic acid hydroconversion over mono- and bimetallic indium doped catalysts supported on alumina and silicas of various textures

100%

Onyestyák G., Harnos S., Badari C. A., Drotár E., Klébert S., Kalló D.

Open Chemistry

2015

vol. 13

issue 1

Consecutive hydroconversion of acetic acid (AA) to ethanol was compared over monometallic and novel bimetallic (containing In as guest metal) catalysts on alumina and silica supports (inter alia highly ordered SBA-15) of different porosity and pore structure. The transformation was studied in a fixed bed, flow-through reactor in the temperature range of 220–380°C using hydrogen flow at 21 bar total pressure. AA hydroconversion activity of Cu and Pt catalysts and the yield of selectively produced alcohol were increased drastically by applying SBA-15 as highly ordered, mesoporous silica support instead of alumina. The most active nickel catalysts do not allow the selective addition of hydrogen to carbon-oxygen bonds independently of supports producing mainly CH4; however, indium doping can completely eliminate the hydrodecarbonylation activity as found in earlier studies. The textural properties of studied silica supports of various textures such as SBA-15, CAB-O-SIL, and Grace Sylobead have a profound impact on the catalytic performance of Ni and Ni2In particles.

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2 Open Chemistry

2 2014

2 Drotár E.

2 Klébert S.

1 Badari C. A.

1 Bódis E.

1 Fazekas P.

1 Harnos S.

1 Kalló D.

1 Keszler A. M.

1 Károly Z.

1 Onyestyák G.

1 Szépvölgyi J.

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Optical emission spectra analysis of thermal plasma treatment of poly(vinyl chloride)

Acetic acid hydroconversion over mono- and bimetallic indium doped catalysts supported on alumina and silicas of various textures