fulltext.study @t Gmail

Direct hydroxylation of benzene to phenol by nitrous oxide on amorphous aluminium-iron binary phosphates

Paper ID Volume ID Publish Year Pages File Format Full-Text
39950 45840 2014 8 PDF Available
Title
Direct hydroxylation of benzene to phenol by nitrous oxide on amorphous aluminium-iron binary phosphates
Abstract

•The iron content has a decisive influence on the catalytic behaviour of the amorphous iron aluminium phosphates.•Aluminium iron phosphates with iron contents ≤1 wt% provided optimum yields to phenol.•Isolated iron species as active sites in the benzene hydroxylation.

The effect of iron content (Fe/Al molar ratio = 0.01–1 equivalent to the iron percentages from 0.5 to 20.5 wt%) and thermal treatment (450–650 °C) of aluminium-iron phosphates, prepared by an ammonia gelation method, on their catalytic performances in the one-step hydroxylation of benzene to phenol by N2O, has been investigated. The solids have been characterized by ICP-MS, EDX, XRD, DRIFT, DR UV–V, XPS, and N2 adsorption techniques. The results obtained showed the critical role of iron content in the catalytic behaviour of binary phosphates while thermal treatment hardly had effect. Phosphates with a lower amount of iron exhibited the best yield to phenol that was similar to those reported in the literature for Fe-MFI type catalysts. Thus, yield to phenol of 22% (0.7 gPhe/gcat h) at 350 °C has been achieved on the binary phosphate with Fe/Al = 0.02 (1 wt% of iron) calcined a 450 °C, in which highly dispersed iron species exist.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (85 K)Download as PowerPoint slide

Keywords
Aluminium iron phosphate; Benzene hydroxylation; Phenol formation; Nitrous oxide; UV–vis; XPS and infrared spectroscopy
First Page Preview
Direct hydroxylation of benzene to phenol by nitrous oxide on amorphous aluminium-iron binary phosphates
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 474, 22 March 2014, Pages 272–279
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis