Pd담지촉매와 고체산촉매를 이용한 HCFC-l42b의 탈염소반응

한광영; 서경원; 목영일; 박건유; 안병성

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.3, 372-376, June, 1998

Export Citation

Pd담지촉매와 고체산촉매를 이용한 HCFC-l42b의 탈염소반응

Dechlorination of HCFC-l42b over Supported Pd Catalysts and Solid Acid Catalysts

한광영, 서경원, 목영일, 박건유, 안병성

초록

Pd를 지지체에 담지시킨 촉매(Pd/AlF₃, Pd/γ-Al₂O₃)와 고체산촉매(γ-Al₂O₃, α-Al₂O₃, AlF₃)를 제조한 후 수소분위기에서 HCFC-142b(1-chloro-1,1-difluoroethane)의 탈염소반응을 수행하여 반응온도, 수소/HCFC-l42b의 공급비(r) 및 Pd담지량 변화가 HFC-143a(1,1,1-trifluoroethane)와 HFC-152a(1,1-difluoroethane)로의 선택도에 미치는 영향을 조사하였다. 실험결과 Pd/AlF₃와 Pd/γ-Al₂O₃ 촉매에 의한 전환율은 각각 60%와 92%였고, 생성가스 중에서 HFC-143a로의 선택도는 각각 58%와 64%였다. 이때 최적반응조건은 반응온도, 200℃, 공간시간 1.05s, 수소/HCFC-142b의 공급비가 3이었다. 한편, 동일 조건하에서 γ-Al₂O₃와 α-Al₂O₃, 그리고 AlF₃ 촉매에 의한 HCFC-142b의 생성가스로의 전환율은 각각 12%, 8%와 7%였고, 생성가스중 HFC-152a로의 선택도는 각각 94%, 92%와 90%였다.

Supported Pd(Pd/AlF₃, Pd/γ-Al₂O₃) catalysts and solid-acid catalysts(γ-Al₂O₃, α-Al₂O₃, AlF₃) were used to perform dechlorination of HCFC-142b(1-chloro-1,1-difluoroethane) in the persence of excess hydrogen. In the reactions the effects of reaction temperature, the mole ratio(r) of H₂ to HCFC-l42b and the amount of supported Pd on dechlorination of HCFC-l42b into HFC-143a(1,1,1-trifluoroethane) or HFC-152a(1,1-difluoroethane) were investigated. The experimental results showed that the conversion of HCFC-142b to prodect gases were 60% and 92%, respectively, and the selectivity to HFC-143a in the prodect gases were 58% and 64% for Pd/AlF₃ and Pd/γ-Al₂O₃ catalysts, respectively. On these catalysts an optimum reaction condition was found at 200℃ with the space time of reactant gases as 1.05 second and the mole ratio of H2 to HCFC-142b as 3. Solid-acid catalysts were also tested at the same reaction condition. The results showed that the conversions of HCFC-142b to prodect gases were 12%, 8% and 7%, and the selectivities to HFC-152a were 94%, 92% and 90% for γ-Al₂O₃, α-Al₂O₃ and AlF₃ catalysts, respectively.

[References]

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[1] Ahn BS, Lee SC, Park KY, Chem. Ind. Technol., 12(3), 255 (1994)

[2] 전학제, "촉매개론," 한림원, 281 (1988)

[3] Bernard COQ, J. Catal., 141, 21 (1993)

[4] Ohnishi R, Wang WL, Ichikawa M, Appl. Catal. A: Gen., 113(1), 29 (1994)

[5] Sinfelt JH, Adv. Catal., 23, 91 (1973)

[6] Kim DW, Ihm SK, Park KY, Lee BG, HWAHAK KONGHAK, 31(6), 831 (1993)

[7] Corma A, Fornes A, Appl. Catal., 61, 175 (1990)

[8] Cerveny L, Amsterdam, 27, 56 (1986)

[9] Satterfield CN, "Heterogeneous Catalysis in Practice," McGraw-Hill, Inc., New York, 151 (1980)

[10] Lee TH, Baeck SH, Lee WY, HWAHAK KONGHAK, 35(3), 451 (1997)

[11] March J, "Advanced Organic Chemistry," Wiley, New York, 3rd ed., 561 (1985)

[12] Dean JA, "Large's Handbook of Chemistry," McGraw-Hill, Inc., New York, 13th ed., 3 (1985)

[13] Wiersma A, Vandesandt EJ, Makkee M, Luteijn CP, Vanbekkum H, Moulijn JA, Catal. Today, 27(1-2), 257 (1996)

[14] Sermon PA, Bond GC, J. Chem. Soc.-Faraday Trans., 72, 745 (1976)