Catalytic abatement of nitrogen oxides–stationary applications

Prospective Catalytic Structured Converters for NH3-SCR of NOx from Biogas Stationary Engines: In Situ Template-Free Synthesis of ZSM-5 Cu Exchanged Catalysts on Steel Carriers

“…To reduce NO x emissions, the well-established process of selective catalytic reduction (SCR) with NH 3 or urea could be used as described for example in [3,4] but the main drawback is the installation size which is connected with the huge size of urea or ammonia dosage systems often exceeding in size the biogas engine itself. Additionally, due to new environmental regulations called Waste Incineration Directive the process efficiency will have to be increased by prolonging monolithic converter.…”

“…Also, the catalyst producers has begun to offer zeolitic catalyst designed for higher temperature operation window than the classic vanadia based SCR catalysts. An example of this can be the commercial ZNX TM catalyst which operates over a higher temperature range (350-590°C), and demonstrates low NH 3 slip and high sulfur resistance [4,14].…”

High-temperature and high-concentration SCR of NO with NH3: Application in a CCS process for removal of carbon dioxide

“…NO x was represented as NO only to make the comparison of catalyst materials the worst case scenario since the standard SCR reaction is slower than the fast SCR one (equal amounts of NO and NO 2 ) [17]. The composition of the gas used for the experiment with CO 2 was as follows: CO 2 In some of the comparisons given below a rate constant for the reduction of NO by the standard SCR reaction is calculated from the following mass balance for an isothermal catalytic bed reactor:…”

“…The catalysts used for this reaction under normal operating conditions, such as for cleaning up combustion gases in association with electricity production, are normally vanadia based [1][2][3][4] albeit noble metals (amongst the first ones used) [5][6][7][8][9] and zeolite types [10][11][12][13][14] have been suggested. The catalysts used have different properties with respect to performance as a function of temperature, with the noble metal catalysts more active in the lower temperature region, the vanadia-based catalysts in the medium temperature region and the zeolite-type catalysts in the higher region [2].…”

“…The catalysts used have different properties with respect to performance as a function of temperature, with the noble metal catalysts more active in the lower temperature region, the vanadia-based catalysts in the medium temperature region and the zeolite-type catalysts in the higher region [2].…”