Selective hydrogen cyanide synthesis from CFC12 (CCl2F2) and ammonia over metal catalysts supported on LaF3 and activated charcoal

Yusaku Takita; Takeshi Imamura; Yukako Mizuhara; Yumi Abe; Tatsumi Ishihara

doi:10.1016/0926-3373(92)80034-W

Selective hydrogen cyanide synthesis from CFC12 (CCl₂F₂) and ammonia over metal catalysts supported on LaF₃ and activated charcoal

Yusaku Takita, Takeshi Imamura, Yukako Mizuhara, Yumi Abe, Tatsumi Ishihara

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The applicability of supports such as LaF₃, activated charcoal and Cr₂O₃ to the new reaction, CCl₂F₂ + 5 3NH₃→HCN + 2HCl + 2HF + 1 3N₂ was examined and it was found that TiO₂ itself reacted with CFC12 to give carbon monoxide and carbon dioxide even at 673 K in addition to hydrogen cyanide formation. LaF₃ did not react with CFC (chlorofluorocarbon) even at 823 K so that it could be considered suitable for use as a catalyst support. Au(1 wt.-%)/LaF₃ and Pt(1 wt.-%)/LaF₃ were effective for hydrogen cyanide formation and hydrogen cyanide selectivity reached 77-78% at 823 K. Activated charcoal was also suitable for use as a catalyst support and hydrogen cyanide was formed selectively (72-84%) over Rh(1 wt.-%)/AC and Pd(1 wt.-%)/AlF₃/AC catalysts at 823 K.

Original language	English
Pages (from-to)	79-87
Number of pages	9
Journal	Applied Catalysis B, Environmental
Volume	1
Issue number	2
DOIs	https://doi.org/10.1016/0926-3373(92)80034-W
Publication status	Published - Jun 26 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Catalysis
Environmental Science(all)
Process Chemistry and Technology

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10.1016/0926-3373(92)80034-W

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@article{05521dd8f5784130a53c9b42b622740b,

title = "Selective hydrogen cyanide synthesis from CFC12 (CCl2F2) and ammonia over metal catalysts supported on LaF3 and activated charcoal",

abstract = "The applicability of supports such as LaF3, activated charcoal and Cr2O3 to the new reaction, CCl2F2 + 5 3NH3→HCN + 2HCl + 2HF + 1 3N2 was examined and it was found that TiO2 itself reacted with CFC12 to give carbon monoxide and carbon dioxide even at 673 K in addition to hydrogen cyanide formation. LaF3 did not react with CFC (chlorofluorocarbon) even at 823 K so that it could be considered suitable for use as a catalyst support. Au(1 wt.-%)/LaF3 and Pt(1 wt.-%)/LaF3 were effective for hydrogen cyanide formation and hydrogen cyanide selectivity reached 77-78% at 823 K. Activated charcoal was also suitable for use as a catalyst support and hydrogen cyanide was formed selectively (72-84%) over Rh(1 wt.-%)/AC and Pd(1 wt.-%)/AlF3/AC catalysts at 823 K.",

author = "Yusaku Takita and Takeshi Imamura and Yukako Mizuhara and Yumi Abe and Tatsumi Ishihara",

year = "1992",

month = jun,

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doi = "10.1016/0926-3373(92)80034-W",

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pages = "79--87",

journal = "Applied Catalysis B: Environmental",

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T1 - Selective hydrogen cyanide synthesis from CFC12 (CCl2F2) and ammonia over metal catalysts supported on LaF3 and activated charcoal

AU - Takita, Yusaku

AU - Imamura, Takeshi

AU - Mizuhara, Yukako

AU - Abe, Yumi

AU - Ishihara, Tatsumi

PY - 1992/6/26

Y1 - 1992/6/26

N2 - The applicability of supports such as LaF3, activated charcoal and Cr2O3 to the new reaction, CCl2F2 + 5 3NH3→HCN + 2HCl + 2HF + 1 3N2 was examined and it was found that TiO2 itself reacted with CFC12 to give carbon monoxide and carbon dioxide even at 673 K in addition to hydrogen cyanide formation. LaF3 did not react with CFC (chlorofluorocarbon) even at 823 K so that it could be considered suitable for use as a catalyst support. Au(1 wt.-%)/LaF3 and Pt(1 wt.-%)/LaF3 were effective for hydrogen cyanide formation and hydrogen cyanide selectivity reached 77-78% at 823 K. Activated charcoal was also suitable for use as a catalyst support and hydrogen cyanide was formed selectively (72-84%) over Rh(1 wt.-%)/AC and Pd(1 wt.-%)/AlF3/AC catalysts at 823 K.

AB - The applicability of supports such as LaF3, activated charcoal and Cr2O3 to the new reaction, CCl2F2 + 5 3NH3→HCN + 2HCl + 2HF + 1 3N2 was examined and it was found that TiO2 itself reacted with CFC12 to give carbon monoxide and carbon dioxide even at 673 K in addition to hydrogen cyanide formation. LaF3 did not react with CFC (chlorofluorocarbon) even at 823 K so that it could be considered suitable for use as a catalyst support. Au(1 wt.-%)/LaF3 and Pt(1 wt.-%)/LaF3 were effective for hydrogen cyanide formation and hydrogen cyanide selectivity reached 77-78% at 823 K. Activated charcoal was also suitable for use as a catalyst support and hydrogen cyanide was formed selectively (72-84%) over Rh(1 wt.-%)/AC and Pd(1 wt.-%)/AlF3/AC catalysts at 823 K.

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