Influence of promoters on the stability of Pd/γ-Al2O3 catalyst for one-step synthesis of dimethylether

doi:10.16085/j.issn.1000-6613.2016.08.26

Abstract

Abstract: A series of Pd/γ-Al₂O₃ hybrid catalysts with different promoters were prepared by impregnation. The catalysts were used for syngas-to-dimethyl(STD)reaction and the influence of the promoters on the catalysts' stability has been investigated. Then,the surface physic-chemical properties and crystal structure of the samples before and after the stability test and coke-burning regeneration test were characterized by a variety of physical techniques,such as N₂ adsorption、XRD、H₂-TPR and TG. Good correlation was observed between the promoters and the stability of Pd/γ-Al₂O₃ catalysts for STD reaction. Compared to the original Pd/Al₂O₃ catalyst,the addition of promoter CeO₂ had increased Pd dispersion,covered partial acid sites and inhibited carbon deposition to a certain degree,resulting in improvements on the activity and stability of the catalyst. The Ce-O-Zr crystal structure was formed when the compound promoters CeO₂-ZrO₂ were added,which was responsible for the increase of Pd dispersity and anti-carbon and anti-sintering ability,and therefore increased the activity and stability of the catalyst. Catalyst modified by SO₄^2- would deactivate quickly because of serious carbon deposition,medium strong acid reduction and sulfur loss.After 20h stability test,the CO conversion and DME selectivity of CeO₂-ZrO₂-Pd/γ-Al₂O₃ were above 59% and 65%,respectively. The catalytic activity of the regenerated catalyst recovered to 91.83% of that of the fresh one.

Key words: Pd/γ-Al₂O₃ catalyst, promoters, preparation, stability, deactivation, syngas-to-dimethyl (STD), syngas

摘要： 采用浸渍法制备了一系列不同助剂下的负载型Pd/γ-Al₂O₃催化剂，考察了助剂类型对Pd/γ-Al₂O₃催化剂一步法合成二甲醚（STD）反应稳定性的影响规律；采用氮吸附、XRD、H₂-TPR及TG等多种表征手段考察了稳定性试验前后以及烧炭再生后催化剂的表面物化性质及结构变化。结果表明，助剂成分对Pd/γ-Al₂O₃催化剂的STD反应稳定性影响显著。相比Pd/γ-Al₂O₃催化剂，添加CeO₂可以提高Pd在γ-Al₂O₃表面的分散度，但会覆盖表面的部分酸性位，一定程度上提高了催化剂的活性和稳定性，但仍存在Pd烧结和积炭现象；添加复合助剂CeO₂-ZrO₂后形成的Ce-O-Zr固熔晶面能显著促进Pd均匀分散，提高催化剂的抗积炭能力和抗烧结能力，催化剂的活性和稳定性更高；经SO₄^2-改性后Pd/γ-Al₂O₃催化剂会因为表面积炭加剧和表面硫流失严重，中强酸酸性位减少而快速失活。CeO₂-ZrO₂-Pd/γ-Al₂O₃催化剂经历20h的稳定性试验后CO转化率仍保持59%以上，二甲醚选择性65%以上，烧炭再生后催化活性恢复至新鲜催化剂的91.83%。

关键词: Pd/γ-Al₂O₃催化剂, 助剂, 制备, 稳定性, 失活, 一步法合成二甲醚, 合成气

CLC Number:

TQ032

CHU Ruizhi, XU Tingting, MENG Xianliang, WU Guoguang, HOU Wenxin. Influence of promoters on the stability of Pd/γ-Al₂O₃ catalyst for one-step synthesis of dimethylether[J]. Chemical Industry and Engineering Progree, 2016, 35(08): 2474-2479.

褚睿智, 徐婷婷, 孟献梁, 吴国光, 侯文心. 助剂对Pd/γ-Al₂O₃催化剂一步法合成二甲醚反应稳定性的影响[J]. 化工进展, 2016, 35(08): 2474-2479.

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Influence of promoters on the stability of Pd/γ-Al₂O₃ catalyst for one-step synthesis of dimethylether

助剂对Pd/γ-Al₂O₃催化剂一步法合成二甲醚反应稳定性的影响

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