School of Chemical Engineering & Light Industry , Guangdong University of Technology , Guangzhou 510006 , P. R. China.
Van 't Hoff Institute for Molecular Sciences , University of Amsterdam , Science Park 904 , Amsterdam 1098 XH , The Netherlands.
ACS Appl Mater Interfaces. 2018 Dec 19;10(50):43570-43577. doi: 10.1021/acsami.8b11235. Epub 2018 Dec 4.
Mg, Co-substituted aluminophosphate zeolites with ERI framework topology (denoted as MgAPO-ERI and CoAPO-ERI) have been synthesized under hydrothermal conditions by using N, N, N', N'-tetramethyl-1,6-hexanediamine as organic template. Their CO adsorption properties are investigated in comparison to those of the pure aluminophosphate counterpart AlPO-ERI. CoAPO-ERI shows the highest CO uptake of 57.3 cm g (273 K and 1 bar) and the highest isosteric heat of 39.0 kJ mol among the three samples. Importantly, the incorporation of Mg and Co ions in the framework of AlPO-ERI can greatly improve the adsorption selectivities of CO over CH and N. Whereafter, transient breakthrough simulations were investigated and further proved the advantages of heteroatoms for separations. These results demonstrate that isomorphous heteroatom substitutions in aluminophosphate zeolites play a key role in enhancing CO adsorption and separation abilities.
镁、钴取代具有 ERI 骨架拓扑结构的磷酸铝沸石（分别表示为 MgAPO-ERI 和 CoAPO-ERI）是在水热条件下，以 N，N，N'，N'-四甲基-1,6-己二胺作为有机模板合成的。与纯磷酸铝对应物 AlPO-ERI 相比，对它们的 CO 吸附性能进行了研究。CoAPO-ERI 在三种样品中表现出最高的 CO 吸附量 57.3 cm g（273 K 和 1 bar）和最高的等立体热 39.0 kJ mol。重要的是，Mg 和 Co 离子在 AlPO-ERI 骨架中的掺入可以极大地提高 CO 对 CH 和 N 的吸附选择性。随后，进行了瞬态穿透模拟，进一步证明了杂原子在分离中的优势。这些结果表明，磷酸铝沸石中同晶杂原子取代在增强 CO 吸附和分离能力方面起着关键作用。
