Rodium-platina oksida

Rodium-platina oksida
Nama
Nama IUPAC
Rodium(III) oksida / Platina(IV) oksida
Nama lain
Rh–Pt oksida, katalis Nishimura
Penanda
3DMet {{{3DMet}}}
Nomor EC
Nomor RTECS {{{value}}}
Sifat
Rh2O3 / PtO2
Massa molar 253,81 / 227,09 (anhidrat)
Penampilan Bubuk hitam[1]
Kecuali dinyatakan lain, data di atas berlaku pada suhu dan tekanan standar (25 °C [77 °F], 100 kPa).
Referensi

Rodium-platina oksida (Rh–Pt oksida), atau katalis Nishimura, adalah senyawa anorganik yang digunakan sebagai katalis hidrogenasi.[2]

Kegunaan

Rh–Pt oksida digunakan untuk mereduksi berbagai senyawa aromatik menjadi sikloalkana atau heterosiklik jenuhnya masing-masing dalam kondisi ringan (seringkali pada suhu kamar dan tekanan atmosfer).[3][4] Dalam aplikasi ini, Rh–Pt oksida lebih unggul dari katalis golongan 10 lainnya seperti platina dioksida. Selanjutnya, katalis ini dapat digunakan untuk melakukan reaksi dengan kehilangan oksigen dalam jumlah minimal yang mengandung gugus fungsi melalui hidrogenolisis.[5][6][7]

Preparasi

Suatu larutan berair dari rodium klorida, asam kloroplatinat, dan natrium nitrat diuapkan dan kemudian dilebur dalam cawan porselen antara 460-480°C sampai pengoksidaan nitrogen berhenti (≈10 menit).[2][4] Massa padat yang dihasilkan kemudian dicuci dengan air suling dan natrium nitrat encer diikuti dengan pengeringan dengan kalsium klorida untuk menghasilkan katalis ini. Biasanya rasio logam yang digunakan untuk membuat katalis ini adalah 3:1 Rh/Pt atau 7:3 Rh/Pt.

Lihat pula

Referensi

  1. ^ Heuser, Heidi. "Nishimura's catalyst". Product Number: 3000034604. Umicore: Precious Metal Chemistry. Diarsipkan dari versi asli tanggal 2016-02-03. Diakses tanggal 21 Juni 2022. 
  2. ^ a b Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (edisi ke-1). New York: Wiley-Interscience. hlm. 42–43, 182, 389–390, 408, & 414–571. ISBN 9780471396987. 
  3. ^ Nishimura, Shigeo (1961). "Hydrogenation and Hydrogenolysis. V. Rhodium-Platinum Oxide as a Catalyst for the Hydrogenation of Organic Compounds". Bulletin of the Chemical Society of Japan. 34 (1): 32–36. doi:10.1246/bcsj.34.32alt=Dapat diakses gratis. 
  4. ^ a b Nishimura, Shigeo (1961). "Rhodium-Platinum Oxide as α Catalyst for the Hydrogenation of Organic Compounds. II. Catalyst Preparation and Effects of Platinum in Rhodium-Platinum Oxide". Bulletin of the Chemical Society of Japan. 34 (10): 1544–1545. doi:10.1246/bcsj.34.1544. 
  5. ^ Nishimura, Shigeo (1960). "Hydrogenation and Hydrogenolysis. III. Rhodium-Platinum Oxide as a Catalyst for the Hydrogenation of the Aromatic Nucleus". Bulletin of the Chemical Society of Japan. 33 (4): 566–567. doi:10.1246/bcsj.33.566alt=Dapat diakses gratis. 
  6. ^ Stocker, J. H. (1962). "Communications to the Editor". The Journal of Organic Chemistry. 27 (5): 2288–2292. doi:10.1021/jo01053a077. 
  7. ^ Nishimura, Shigeo; Taguchi, Hisaaki (1963). "Hydrogenation and Hydrogenolysis. VII. Selective Hydrogenation of Aromatic Compounds Containing C–O Linkages Liable to Hydrogenolysis with a Rhodium-Platinum Oxide under high Pressures". Bulletin of the Chemical Society of Japan. 36 (3): 353–355. doi:10.1246/bcsj.36.353alt=Dapat diakses gratis. 

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