Mutual Tailored Bimetallic Rh–Co Supported on La Modified SiO2 for Direct Ethanol Synthesis from Syngas,Industrial & Engineering Chemistry Research

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Mutual Tailored Bimetallic Rh–Co Supported on La Modified SiO2 for Direct Ethanol Synthesis from Syngas
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-02-14 , DOI: 10.1021/acs.iecr.8b05474
Huixian Zhong _{1,

2} , Jiaming Wang _{1,

2} , Shaoxia Guo _{1,

2} , Kegong Fang ₃ , Yuan Liu _{1,

2}

Affiliation

In this work, Rh–Co/La₂O₃–SiO₂ showed excellent selectivity to ethanol for direct ethanol synthesis from syngas. The best catalyst exhibited 42.8% selectivity to ethanol with CO conversion of 12.3% and in 145 h’ running maintained stable at 553 K, 3 MPa and GHSV of 3900 mL (g_cat h)⁻¹. The investigate results indicated that the interaction of cobalt denoting electron to rhodium adjusted the amounts of carbon monoxide adsorbed associatively and dissociatively, and maybe created a new active site pair of Rh⁰/Co^δ+ for generating ethanol. Moreover, the mutually doping effect could dilute Co and Rh atoms in Rh–Co nanoparticles (NPs), which effectively suppressed the formation of C₂₊H and C₃₊OH, and thus led to the high ethanol selectivity and good anticoking property assisting with the carbon eliminating effect of La₂O₃. Owing to the high dispersion of Rh–Co NPs, the catalyst showed good activity and high resistance to sintering.

中文翻译：

La改性SiO ₂上负载的互配双金属Rh-Co用于合成气直接合成乙醇

在这项工作中，Rh–Co / La ₂ O ₃ –SiO ₂对从合成气直接合成乙醇具有优异的乙醇选择性。最好的催化剂对乙醇的选择性为42.8％，CO转化率为12.3％，在145 h'内，在553 K，3 MPa和GHSV为3900 mL（g _cat h）^-1的条件下保持稳定。研究结果表明，钴与电子之间的相互作用，调节了缔合和解离吸附一氧化碳的量，并可能产生了新的活性位对Rh ⁰ / ^Coδ+用于产生乙醇。此外，相互掺杂的作用可以稀释Rh-Co纳米颗粒（NPs）中的Co和Rh原子，从而有效地抑制了C ₂₊ H和C ₃₊ OH的形成，因此具有较高的乙醇选择性和良好的抗焦性能。具有La ₂ O _3的除碳效果。由于Rh-Co NPs的高分散性，该催化剂表现出良好的活性和较高的抗烧结性。

更新日期：2019-02-14

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