fulltext.study @t Gmail

Conversion of ethanol to propylene over HZSM-5(Ga) co-modified with lanthanum and phosphorous

Paper ID Volume ID Publish Year Pages File Format Full-Text
41170 45879 2012 8 PDF Available
Title
Conversion of ethanol to propylene over HZSM-5(Ga) co-modified with lanthanum and phosphorous
Abstract

Conversion of ethanol to propylene was carried out over HZSM-5(Ga) co-modified with lanthanum and phosphorous (La/P/HZSM-5(Ga)). The propylene yield was strongly dependent on both the La/Ga and P/Ga ratios, and the highest value of ca. 29 C-% was obtained at a P/Ga ratio of 1 and a La/Ga ratio of 0.4. FT-IR, 31P MAS NMR, and 71Ga MAS NMR measurements demonstrate that the introduced lanthanum reacts with the pre-introduced phosphorous to regenerate some of Brønsted acid sites (Si(OH)Ga), and accordingly, the Brønsted acid sites are homogeneously distributed within the zeolite framework. In addition, the catalytic stability as well as the catalytic activity of HZSM-5(Ga) was effectively enhanced by co-modification with lanthanum and phosphorous because of the suppression of carbonaceous deposition and elimination of gallium from the zeolite framework.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (102 K)Download as PowerPoint slideHighlights► HZSM-5(Ga) co-modified with lanthanum and phosphorous was prepared. ► High propylene yield of ca. 29 C-% was obtained at a P/Ga ratio of 1 and a La/Ga ratio of 0.4. ► Co-modification was very effective for improvement of the catalytic activity and stability of HZSM-5(Ga).

Keywords
Ethanol; Propylene; ZSM-5; Phosphorous; Lanthanum
First Page Preview
Conversion of ethanol to propylene over HZSM-5(Ga) co-modified with lanthanum and phosphorous
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 417–418, 29 February 2012, Pages 137–144
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis