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Catalysis in Industry : Volume 4, Issue 1, March 2012

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Catalysis in Industry : Volume 1

Oxidation of ammonia on woven and knitted platinoid gauzes

Content Provider	Springer Nature Link
Author	Vanchurin, V. I. Golovnya, E. V. Yashchenko, A. V.
Copyright Year	2012
Abstract	The results from pilot tests of catalytic systems equipped with 7–12 woven or 5–14 knitted platinoid gauzes in the oxidation of ammonia are considered. OAO Yekaterinburg Non-Ferrous Metal Processing Plant produces gauzes of the two types: Pt$_{092}$ 0.092-mm wire woven and Pt$_{076}$ 0.076-mm wire loosely knitted (large-mesh) gauzes. Both types of gauzes are made of PdRdRu 15-3.5-0.5 alloy (referred to as alloy no. 5) and have the following elemental composition: Pt, 81%; Pd, 15%; Rh, 3.5%; Ru, 0.5% (STO (Branch Standard) 00195200-013-2007 and STO (Branch Standard) 00195200-014-2007). The third type is 0.076-mm tightly knitted (small-mesh) gauzes (Uncore, Germany), which differ from the Russian knitted Pt$_{076}$ gauze by their greater mass and external surface area per unit reactor cross section. The effect of the mass, external surface area, and free volume of woven and knitted platinoid gauzes on the yield of nitrogen oxide is studied in this work, and the residual concentration of ammonia downstream of a stack of gauzes is determined in dependence on their number. The efficiency of the unit surface of knitted gauzes depends on the influence exerted by transfer phenomena and the direct homogeneous ammonia reduction of nitrogen oxide in the free volume of a platinoid catalyst stack. Loosely-knitted Pt$_{076}$ gauzes are less efficient than woven Pt$_{092}$ gauzes within a ≥91.5% range of nitrogen oxide yields. Tightly knitted gauzes are suitable for use within a ≤94.5% range of nitrogen oxide yields. Yields equivalent to those obtained on woven gauzes cannot be attained on tightly knitted gauzes even after their external surface area is enlarged considerably. Maximum nitrogen oxide yields (≈95%) are attained on Pt$_{092}$ woven gauzes. From the results of our tests of loosely and tightly knitted platinoid gauzes, it follows that the latter (with less free volume in a stack) are preferable for use. The free volume of gauzes and the fraction of ammonia for nontargeted conversion can be minimized by placing a smaller number of loosely knitted platinoid gauzes on a regular honeycomb block catalyst or packing bed.
Starting Page	105
Ending Page	109
Page Count	5
File Format	PDF
ISSN	20700504
Journal	Catalysis in Industry
Volume Number	4
Issue Number	2
e-ISSN	20700555
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-06-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ammonia oxidation platinoid gauzes nitric acid pilot tests Catalysis
Content Type	Text
Resource Type	Article
Subject	Catalysis

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