Shape selective synthesis of long-chain linear alkyl benzene (LAB) with AlMCM-41/Beta zeolite composite catalyst
✍ Scribed by Ankur Bordoloi; Biju M. Devassy; P.S. Niphadkar; P.N. Joshi; S.B. Halligudi
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 140 KB
- Volume
- 253
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
The liquid-phase alkylation of benzene with long-chain olefins such as 1-decene, 1-octene and 1-dodecene was carried out over AlMCM-41/Beta zeolite composite material as catalyst. The catalyst was prepared by seeding method and characterized by XRD, N 2 sorption, FTIR pyridine adsorption, NH 3 -TPD and SEM. Powder XRD of AlMCM-41/Beta zeolite composite material showed the co-existence of well-structured microporous and mesophase of AlMCM-41. The typical textural characteristics of micro-and meso-structured phases were observed in the composite material. The effect of temperature, reactant molar ratios and catalyst weight on 1-dodecene conversion and products selectivity was studied. The composite catalyst was found to be the highly selective towards the formation 2-dodecylbenzene. Under the reaction conditions of 120 • C, benzene/1-dodecene molar ratio 10 and time 2 h, the catalyst gave 48% dodecene conversion with 76%, 2-dodecylbenzene selectivity. Significant improvement in catalytic activity has been achieved by composite material as compared to Al-MCM-41. Although zeolite beta and composite material gave similar conversion of dodecene, the composite material showed higher selectivity towards 2-dodecylbenzene, which could be due to higher diffusibility of 2-dodecylbenzene isomer in the composite material.