A Highly Stable Nonaqueous Suspension for the Electrophoretic Deposition of Powdered Substances

Mizuguchi, Jin; Sumi, K.; Muchi, T.

doi:10.1149/1.2120105

Cited by 63 publications

(35 citation statements)

References 12 publications

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“…2.3 Fixation of -Fe 2 O 3 powders onto cordierite honeycomb substrates A particular suspension described in our previous report 23) was used for the dip coating of powdered -Fe 2 O 3 onto a honeycomb substrate. The suspension comprises a ketonic solvent, a minute amount of nitrocellulose as the dispersant or surface active agent, and -Fe 2 O 3 powders.…”

Section: Measurements Of the Electrical Conductivity And Thementioning

confidence: 99%

Electrical Properties of Semiconductive α-Fe2O3 and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

2010

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We are so far involved in the development of complete decomposition of organic wastes as well as volatile organic compounds (VOCs) by the use of thermally activated holes in titanium oxide (TiO 2 ) at high temperatures of about 350-500 C. In this study, we intend to replace TiO 2 with -Fe 2 O 3 (red hematite) in order to lower the operation temperature and also to electrically characterize -Fe 2 O 3 on the basis of the temperature dependence of electrical conductivity and Seebeck potential. Powdered -Fe 2 O 3 is found to exhibit a higher electrical conductivity at 500C by three orders of magnitude as compared with that of room temperature. In addition, the Seebeck potential is negative in the temperature range between room temperature and 380 C, indicating that the dominant charge carriers are mostly holes. Our -Fe 2 O 3 -coated catalyst-system exhibits equivalent or even better characteristics than that of TiO 2 , although the specific surface of -Fe 2 O 3 (4.10 m 2 /g) is two orders of magnitude smaller than that of TiO 2 (298 m 2 /g).

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Section: Measurements Of the Electrical Conductivity And Thementioning

confidence: 99%

Electrical Properties of Semiconductive α-Fe2O3 and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

2010

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“…honeycomb substrates A particular suspension described in our previous report 17) was used for the dip coating of powdered Cr 2 O 3þx onto a honeycomb substrate. The suspension comprises a ketonic solvent, a minute amount of nitrocellulose as the dispersant or surface active agent, and Cr 2 O 3þx powders.…”

Section: Fixation Of Powdered Crmentioning

confidence: 99%

Thermally Activated Cr2O3+x for Elimination of Volatile Organic Compounds

2010

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We have previously shown that oxide semiconductors (for example, TiO 2 , NiO, etc.) exhibit significant catalytic effects when heated at about 350-500C. This is due to the formation of a vast number of highly oxidative holes at high temperatures. Then, we applied the present finding for complete removal of volatile organic compounds (VOCs). In the present investigation, we focused on Cr 2 O 3þx (0 < x < 1) in an attempt to lower the operation temperature of VOC decomposition. We present here how the low-temperature operation proceeds with Cr 2 O 3þx and also elucidate why Cr 2 O 3þx is colored green, on the basis of the temperature dependences of electrical conductivity and Seebeck potential of Cr 2 O 3þx . The green color of Cr 2 O 3þx is found to arise from Cr vacancies in Cr 2 O 3þx , and the vacancies are responsible for the formation of a narrow conduction band or a deep acceptor level, resulting in the low-temperature operation of VOC decomposition.

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“…The suspension used was composed of a ketonic solvent, a minute amount of nitrocellulose as the dispersant or surface active agent, and powdered substances of metal oxides. 20,21) The fixation was carried out as follows. 30 g of NiO or Cr 2 O 3 powders was first dried in air at 200 C for 1 h to eliminate water moisture.…”

Section: Annealing Of Ni-cr Wires In Wet Hydrogenmentioning

confidence: 99%

VOC Decomposition System Based upon Heater-Integrated Catalyst Units Using NiO or Cr2O3

Maki

Mizuguchi

2010

Mater. Trans.

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We have previously shown that oxide semiconductors (TiO 2 , NiO, Cr 2 O 3 , etc.) exhibit remarkable catalytic effects when heated at high temperatures of about 350-500 C and that the effect has been interpreted in terms of the formation of a large number of highly oxidative holes caused by thermal excitation of semiconductors. This prompted us to utilize this technology for complete removal of volatile organic compounds (VOCs). In the present investigation, we aim at constructing a compact device for practical implementation composed of four-stacked ''heater/ honeycomb'' units. Each unit comprises a spiral Ni-Cr heater as well as a honeycomb plate coated with powdered NiO or Cr 2 O 3 . Decomposition experiment was carried out in the range from room temperature to 500 C, using 10000 ppm toluene as the VOC at a flow rate of 10 l/min. As a result, the toluene decomposition was found to begin at about 100 C and was completed (i.e., 0 ppm) at about 300 C, showing an excellent decomposition characteristic in both NiO and Cr 2 O 3 .

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A Highly Stable Nonaqueous Suspension for the Electrophoretic Deposition of Powdered Substances

Cited by 63 publications

References 12 publications

Electrical Properties of Semiconductive α-Fe<SUB>2</SUB>O<SUB>3</SUB> and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

Electrical Properties of Semiconductive α-Fe<SUB>2</SUB>O<SUB>3</SUB> and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

Thermally Activated Cr<SUB>2</SUB>O<SUB>3+<I>x</I></SUB> for Elimination of Volatile Organic Compounds

VOC Decomposition System Based upon Heater-Integrated Catalyst Units Using NiO or Cr<SUB>2</SUB>O<SUB>3</SUB>

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A Highly Stable Nonaqueous Suspension for the Electrophoretic Deposition of Powdered Substances

Cited by 63 publications

References 12 publications

Electrical Properties of Semiconductive &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB> and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

Electrical Properties of Semiconductive &alpha;-Fe<SUB>2</SUB>O<SUB>3</SUB> and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

Thermally Activated Cr<SUB>2</SUB>O<SUB>3+<I>x</I></SUB> for Elimination of Volatile Organic Compounds

VOC Decomposition System Based upon Heater-Integrated Catalyst Units Using NiO or Cr<SUB>2</SUB>O<SUB>3</SUB>

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Electrical Properties of Semiconductive α-Fe<SUB>2</SUB>O<SUB>3</SUB> and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds

Electrical Properties of Semiconductive α-Fe<SUB>2</SUB>O<SUB>3</SUB> and Its Use as the Catalyst for Decomposition of Volatile Organic Compounds