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Tri-templates synthesis of SAPO-34 and its performance in MTO reaction by statistical design of experiments

Paper ID Volume ID Publish Year Pages File Format Full-Text
39379 45821 2015 9 PDF Available
Title
Tri-templates synthesis of SAPO-34 and its performance in MTO reaction by statistical design of experiments
Abstract

•Synthesis of SAPO-34 catalysts with high purity and small crystal size by employing tri-templating.•Achieving noticeable light olefin yield (88.7%) in MTO reaction.•The content of TEA as a template possesses the most significant effect in synthesis gel.•High purity and crystallinity lead to ameliorate catalytic performance in MTO process.•The superior yield belongs to the sample with the lowest crystal size and the highest crystalline and surface area.

The effect of a tri-templating agent [i.e., tetraethyl ammonium hydroxide (TEAOH), triethylamine (TEA) and morpholine (MOR)] on the catalytic performance of SAPO-34 catalyst was investigated in conversion of methanol to olefins (MTO). SAPO-34 catalysts were synthesized hydrothermally with nominal composition as 1 Al2O3:1 P2O5:0.4 SiO2:2y TEAOH:2x TEA:2 (1 − (x + y)) MOR:70 H2O. The products were characterized by XRD, SEM, BET, EDX, FT-IR, NH3-TPD techniques. The relative molar ratios were obtained by response surface methodology applying central composite design. Tri-templating led to production of pure SAPO-34 phase with reduced particle sizes. Analysis of Variance (ANOVA) applied for investigating the significance of two independent variables indicated that TEA content was the most significant variable. The catalytic performance of the prepared catalysts was tested in MTO reaction at 410 °C and WHSV of 6.5 h−1. Sample prepared with 0.5 MOR:0.5 TEA:1 TEAOH exhibited the highest yield of light olefins (88.7 wt%) owing to its highest crystallinity, smallest crystal size and highest surface area.

Graphical abstractSynthesis of SAPO-34 samples using mixture of three templates namely, morpholine, tetraethyl ammonium hydroxide and triethylamine showed tri-templating led to particle size reduction. Performing reactor tests over SAPO-34 catalysts indicated that catalyst with molar ratios of 0.5 MOR:0.5 TEA:1 TEAOH possessed excellent catalytic activity and stability due to its smallest particle size and highest crystallinity.Figure optionsDownload full-size imageDownload high-quality image (173 K)Download as PowerPoint slide

Keywords
MTO reaction; Light olefin; SAPO-34; Tri-templating; Central composite design
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Tri-templates synthesis of SAPO-34 and its performance in MTO reaction by statistical design of experiments
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 493, 5 March 2015, Pages 103–111
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us