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(NH_4)AgMoS_4: Synthesis, structure and catalytic activity

机译:(NH_4)AgMoS_4:合成,结构和催化活性

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摘要

The synthesis, characterization and crystal structure of (NH _4)AgMoS_4 is presented. (NH_4)AgMoS_4 was prepared by the stoichiometric reaction of AgNO_3 with (NH _4)_2MoS_4. The black microcrystalline (NH _4)AgMoS_4 is thermally unstable and contaminated by a phase that analyzes for Ag_2MoS_4. In the TGA continuous weight loss was observed corresponding to the loss of ammonia gas subsequent loss of sulfur and H_2S to give Ag_2S and MoS_2. In the infrared spectrum of (NH_4)AgMoS_4, characteristic bands for the ammonium ion at 1350-1400 cm~(-1) and for the [MoS _4]~(2-) group at 460 cm~(-1) are observed. Crystals of (NH_4)AgMoS_4 were investigated using a synchroton source. (NH_4)AgMoS_4 is isostructural to (NH _4)CuMoS_4 and crystallizes in the tetragonal space group I4 (Z = 2, a = 7.8740(3), c = 5.7733(4) ?). (NH_4)AgMoS _4 can be used as a catalyst in the syngas conversion to higher alcohols with showing good activity and ethanol selectivity.
机译:介绍了(NH _4)AgMoS_4的合成,表征和晶体结构。通过AgNO_3与(NH _4)_2MoS_4的化学计量反应制备了(NH_4)AgMoS_4。黑色微晶(NH _4)AgMoS_4热不稳定,并被分析Ag_2MoS_4的相所污染。在TGA中观察到连续的重量损失,这对应于氨气的损失,随后损失了硫和H_2S,从而得到Ag_2S和MoS_2。在(NH_4)AgMoS_4的红外光谱中,在1350-1400 cm〜(-1)处观察到铵离子的特征谱带,在460 cm〜(-1)处观察到[MoS _4]〜(2-)基团的特征带。使用同步子源研究了(NH_4)AgMoS_4的晶体。 (NH_4)AgMoS_4与(NH_4)CuMoS_4同构,并且在四边形空间群I4中结晶(Z = 2,a = 7.8740(3),c = 5.7733(4)→)。 (NH_4)AgMoS_4可以用作合成气转化为高级醇的催化剂,具有良好的活性和乙醇选择性。

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