In situ studies of supported rhodium catalysts
In situ studies of supported rhodium catalysts
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负载型铑催化剂的原位研究
DOI：
10.1039/dc9908900091
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
B. Williams
中科院分区：
文献类型：
--
作者：
P. Johnston;R. Joyner;P. Pudney;E. S. Shpiro;B. Williams
铑催化剂已经制备，负载在γ-氧化铝、氧化钒（III）、氧化铬和氧化铝上。研究了这些材料在合成气（H2/CO：1/1，523 K和5 bar压力）转化为甲醇、乙醇和烃类中的活性和选择性。除了氧化铬在所选温度下几乎无活性外，所有催化剂都显示出相似的活性。对较高含氧化合物的选择性遵循以下趋势：V2 O3> MoO 3> Al 2 O3> Cr2 O3。氧化铝负载型催化剂具有最高的甲醇选择性。催化剂的特征在于原位扩展X射线吸收精细结构（EXAFS）和氧化铝负载的材料已被检查的最详细的。在473 K还原条件下，在氧化铬载体上制备出了直径为30的铑颗粒，并讨论了催化剂结构与性能的关系。
Rhodium catalysts have been prepared, supported on γ-alumina, vanadium(III) oxide, chromia and molybdena. The activity and selectivity of these materials in the conversion of synthesis gas, (H2/CO: 1/1, 523 K and 5 bar pressure), to methanol, ethanol and hydrocarbons has been studied. All catalysts showed similar activity except for chromia, which was almost inactive at the temperature chosen. Selectivity to higher oxygenates followed the trend: V2O3 > MoO3 > Al2O3 > Cr2O3. The alumina supported catalysts had the highest selectivity to methanol. Catalysts have been characterised in situ by extended X-ray absorption fine structure (EXAFS) and the alumina-supported material has been examined in the greatest detail. On reduction at 473 K, rhodium particles with diameter 30 A diameter, on the chromia support.The relation between catalyst structure and performance is discussed.