当前位置: X-MOL 学术Catal. Today › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Direct synthesis of liquefied petroleum gas from syngas over H-ZSM-5 enwrapped Pd-based zeolite capsule catalyst
Catalysis Today ( IF 5.2 ) Pub Date : 2017-09-08 , DOI: 10.1016/j.cattod.2017.09.001
Peipei Zhang , Guohui Yang , Li Tan , Peipei Ai , Ruiqin Yang , Noritatsu Tsubaki

A facile synthesis route, named dual-layer crystal growth method, was developed for preparing Pd-based zeolite capsule catalyst. The millimeter-sized zeolite capsule catalyst (Pd/SiO2-SZ) with a core-shell structure was prepared by a developed dual-layer crystal growth method: coating Silicalite-1 and H-ZSM-5 zeolite orderly as double shells encapsulating the Pd/SiO2 core catalyst. We employed the prepared Pd/SiO2-SZ zeolite capsule catalyst for the direct synthesis of liquefied petroleum gas (LPG) from syngas (CO + H2). In the reaction, the zeolite capsule catalyst showed excellent LPG selectivity than the single core catalyst of Pd/SiO2 and the physical mixture catalyst prepared by a simply mixing core and shell catalysts. The Pd/SiO2-SZ realized the highest LPG selectivity of 34.4% with CO conversion of 14.1%. Moreover, the optimal reaction temperature and pressure in the reaction for LPG direct synthesis from syngas over Pd/SiO2-SZ catalyst were 623 K and 5.0 MPa, respectively. The high performance of zeolite capsule catalyst Pd/SiO2-SZ was attributed to the enforced mass transfer diffusion from inside to outside of the catalyst.



中文翻译:

H-ZSM-5包裹的Pd基沸石胶囊催化剂由合成气直接合成液化石油气

开发了一种简便的合成路线,称为双层晶体生长方法,以制备Pd基沸石胶囊催化剂。通过开发的双层晶体生长方法制备了具有核-壳结构的毫米大小的沸石胶囊催化剂(Pd / SiO 2 -SZ):将Silicalite-1和H-ZSM-5沸石有序地涂覆为双层壳,将其包裹Pd / SiO 2核心催化剂。我们将制备的Pd / SiO 2 -SZ沸石胶囊催化剂用于从合成气(CO + H 2)直接合成液化石油气(LPG )。反应中,与Pd / SiO 2单核催化剂相比,沸石胶囊催化剂具有优异的LPG选择性。通过简单地将核和壳催化剂混合而制备的物理混合物催化剂。Pd / SiO 2 -SZ实现了34.4%的最高LPG选择性,CO转化率为14.1%。此外,在Pd / SiO 2 -SZ催化剂上由合成气直接合成LPG的最佳反应温度和压力分别为623 K和5.0 MPa。沸石胶囊催化剂Pd / SiO 2 -SZ的高性能归因于从催化剂内部到外部的强制传质扩散。

更新日期:2017-09-08
down
wechat
bug