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Preparation of Noble Metal Monolithic Catalysts by Electroless Plating and Their Application in Toluene Catalytic Purification

Author: LiuZuChao
Tutor: LiYongFeng
School: Guangdong University of Technology
Course: Industrial Catalysis
Keywords: Composite plating Catalytic combustion Toluene Electroless plating Overall platinum-based catalyst
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 48
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Abstract


Volatile organic compounds (VOCs) are an important class of atmospheric pollutants, and serious harm to the ecological environment and human health. Catalytic combustion can be much lower than the direct combustion of processing low concentrations of VOCs gas temperature conditions, high purification efficiency, no secondary pollution, low energy consumption, is one of the most effective ways to deal VOCs applications commercial processing. The core of the catalytic combustion technology is the development of efficient combustion catalyst, so the development of high-activity, high stability of the catalyst is a key task of the catalytic combustion of organic waste gas. Given the unique advantages of the electroless plating method in the prepared platinum, palladium and other precious metal catalyst, the paper on the basis of the electroless plating of palladium, using electroless composite plating method of in situ incorporation of a non-noble metal oxide of manganese to prepare a palladium-based monolithic catalyst in order to improve prepared by the catalytic performance of the catalyst and reduce the amount of the noble metal; the same time as the precious metals platinum having more excellent low-temperature catalytic combustion activity, and therefore also by electroless plating method of the bi-metal of the platinum group, and platinum palladium doped monolithic catalyst. Main research content and results are as follows: a new type of composite plating technique, somatic colloidal particles and restore the manganese oxide precipitated palladium metal particles simultaneously interleaved deposition in cordierite honeycomb ceramic substrate surface, and then by the high-temperature heat treatment soon overall MnOX doped palladium-based catalyst. From the activity tests, compared with single-palladium catalyst, doped palladium based catalysts combustion greatly enhanced the activity of the toluene, the activity of the catalyst in the the palladium mass loading of 0.36% BEST, T99 was reduced by about 20 ℃. Manganese oxide particles staggered doped with palladium component particles, effectively promote the uniform dispersion of the Pd component to avoid migration of the Pd component gathering grew by XRD, SEM, BET and UV characterization results can be found, thus promoting the catalytic catalytic performance improved significantly. Found through the catalyst before and after the reaction of the XPS analysis at the same time, the doping type palladium-based catalyst in toluene catalytic combustion reaction by the synergistic effect of the metal Pd and PdO jointly promote the catalytic reaction proceeds. Also by electroless plating techniques, the monolithic catalyst prepared platinum group noble metal platinum in the cordierite ceramic honeycomb substrate surface directly. First to toluene catalytic combustion as a probe reaction, draw the best preparation conditions of the chemical plating platinum: the chemical plating time for 1-2 hours, the temperature of 30-50 ° C, the reducing agent need batches repeatedly added calcination temperature was 350 ℃. Considering from Catalyst Performance and economic factors, the platinum loading was the highest price of 0.12wt% Pt / ceramic honeycomb monolith catalyst in toluene catalytic combustion reaction, T10 and T99, respectively, at 163 ℃ and 180 ℃; while the catalyst larger airspeed range (3000-40000h-1) and a wider air intake toluene concentration range (0.5-8.0g/m3) can maintain a high catalytic combustion activity; in seven repeated use of the catalyst to total the stability of the test of 93 h, the toluene conversion rate has remained at 99% or more. Followed by a catalyst such as XRD, SEM and BET characterization analysis found that uniform distribution of Pt on the surface of the ceramic substrate, the small particles of the active ingredient, but the calcination temperature is higher easily gathering grew; simultaneously by XPS before and after the catalyst in the reaction analysis found The overall catalytic activity of platinum group metal oxides of Pt and Pt synergy, but also participate in the reaction of the main oxygen species are adsorbed oxygen. Finally, palladium doping on the influence of the platinum group as a whole catalyst, and found that in the bimetallic catalyst of platinum and palladium, the platinum component of toluene catalytic combustion activity largest contribution, but the palladium component is added to effectively improve the heat stability of the catalyst sex.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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