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High surface area tin oxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
44116 46004 2007 10 PDF Available
Title
High surface area tin oxide
Abstract

High surface area tin oxides are desirable catalyst carriers for emissions control including CO oxidation, VOC removal/methane combustion and NOx abatement. We have optimized literature procedures as well as developed proprietary recipes for the synthesis of porous SnO2 carriers. Precipitation of SnCl4 from homogeneous solution by urea and by hydrazine, the dissolution of Sn metal powder in HNO3, sol–gel routes from Sn alkoxides and inorganic Sn precursors, acid-induced gelation of K2SnO3, the Pechini method ex Sn(OAc)4 using various organic acids as dispersants and dry and wet thermal decomposition of Sn carboxylates have been investigated and compared. BET surface areas >100 m2/g have been achieved by a variety of methods after calcination in the temperature range 300–500 °C. High surface area tin oxides with excellent sintering resistance (250, 228, 190 and 175 m2/g after calcination at 300, 400, 500 and 600 °C, respectively) have been synthesized by the hydrazine method. Pt/SnO2 catalysts have been prepared by impregnation with Pt tetraamine hydroxide solution, and screened for propylene combustion and CO oxidation activity in a parallel 8 × 1 process optimization reactor. Light-off takes place at higher temperatures for CO oxidation than for propylene combustion due to Pt poisoning by CO at lower temperatures. High surface areas >200 m2/g could also be achieved by a modified Pechini method using aqueous glyoxylic acid as dispersant for Sn(IV) acetate. Ce–Sn–Co mixed oxides have been synthesized by the glyoxylic acid method, impregnated with Pt–Ru and found to be more active than Pt/Al2O3 for CO oxidation when using CO-only feed, but inferior to the Pt standard when feeding a CO–propylene mixture.

Graphical abstractProprietary recipes and optimized literature procedures for the synthesis of porous SnO2 carriers were developed. Easily decomposed organic acid dispersants for inorganic tin precursors produce high surface areas (about 200 m2/g). Tin oxides with BET surface areas >200 m2/g were achieved by the hydrazine synthesis method. Several Pt-Ru-Co catalysts supported on tin oxides were tested for low temperature VOC combustion and CO oxidation in high-throughput reactors: C3H6, CO + O2 → CO2 + H2O. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
High surface area; Tin oxide; Carriers; Supports; Sol–gel; Pechini; Propylene combustion; VOC removal; CO oxidation; Combinatorial chemistry; Combinatorial catalysis; Heterogeneous catalysis; High-throughput synthesis; High-throughput screening
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High surface area tin oxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 317, Issue 2, 7 February 2007, Pages 139–148
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