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首页> 外文期刊>RSC Advances >The effects of PVP-modified SiO2 on the catalytic performance of CO hydrogenation over Rh–Mn–Li/SiO2 catalysts
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The effects of PVP-modified SiO2 on the catalytic performance of CO hydrogenation over Rh–Mn–Li/SiO2 catalysts

机译：PVP改性SiO 2 对Rh–Mn–Li / SiO 2 催化剂上CO加氢催化性能的影响

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摘要

Rh–Mn–Li catalysts supported on SiO2 prepared by PVP-modified St?ber method were used for the synthesis of C2+ oxygenates from CO hydrogenation. The catalysts were characterized by TG, XRD, N2-adsorption–desorption, TEM, H2-TPR, in situ FT-IR, TPSR, and XPS. Activity testing results showed that the Rh–Mn–Li catalyst supported on the SiO2 modified by 1 g PVP exhibited the highest CO conversion and selectivity of C2+ oxygenates compared with other catalysts. Characterization results indicated that the addition of an appropriate amount of PVP is beneficial to the formation of weakly H-bonded hydroxyl groups on the surface of SiO2, which promotes Rh dispersion and weakens the Rh–Mn interaction. Furthermore, the higher Rh dispersion and the weaker Rh–Mn interaction promote CO absorption, enhance the CO dissociation ability and restrain the hydrogenation activity, which are favorable for the CO insertion into the metal–CHX band, finally resulting in excellent catalytic performance for C2+ oxygenates synthesis.
机译：用PVP改性St？ber法制备的负载在SiO 2 上的Rh-Mn-Li催化剂用于合成C 2 + 含氧化合物。用TG，XRD，N 2 -吸附-脱附，TEM，H 2 -TPR对催化剂进行了表征。 ，原位 FT-IR，TPSR和XPS。活性测试结果表明，负载1g PVP的SiO 2 负载的Rh-Mn-Li催化剂表现出最高的CO转化率和C 2 + 含氧化合物。表征结果表明，加入适量的PVP有利于在SiO 2 表面形成弱H键结合的羟基，促进Rh的分散和减弱Rh-Mn的相互作用。此外，较高的Rh分散度和较弱的Rh-Mn相互作用促进了CO的吸收，增强了CO的解离能力并抑制了氢化活性，这有利于CO插入金属–CH X 谱带，最终导致对C 2 + 的出色催化性能小>含氧化合物的合成。

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