Insight of platinum poisoning Cu/SAPO-34 during NH3-SCR and its promotion on catalysts regeneration after hydrothermal treatment

Enhanced Performance for Selective Catalytic Reduction of NOx with NH3 over Nanosized Cu/SAPO‐34 Catalysts

“…As shown in Figure S6, only a peak at 180–280 °C that represents the reduction of isolated Cu 2+ to Cu + ions is observed. This indicates that Cu 2+ ions are the main active sites in the catalyst . The acidity of the Cu/S N ‐In catalysts are also investigated by measuring the DRIFTS spectra of the adsorbed NH 3 .…”

“…This indicates that Cu 2 + ions are the main active sites in the catalyst. [4,34] The acidity of the Cu/S N -In catalysts are also investigated by measuring the DRIFTS spectra of the adsorbed NH 3 . As shown in Figure 3a, the negative bands at 3663 and 3606 cm À 1 assigned to the OH vibrations of PÀ OH or SiÀ OH group on external surface and structural hydroxyl groups AlÀ OHÀ Si, respectively, are observed in all catalysts.…”

Assembly of Sub‐Crystals on the Macroscale and Construction of Composite Building Units on the Microscale for SAPO‐34

“…Among SAPO materials, SAPO-34w ith aC HA framework structureh as been attracting considerable interesti n methanol to hydrocarbon reactions, [4,5] syngas to hydrocarbon reactions, [6] and selectivec atalytic reduction (SCR) of NO x . [7,8] The structure of SAPO-34 ( Figure 1) consistso ft wo composite buildingu nits, double-six-membered rings (d6r), and cha cages, which are joined together to form at hree-dimensional network of pores with 0.38 nm diameter windows connecting ellipsoidal cages with dimensions of 0.74 nm 1.1 nm. [9] The morphology and crystal size affects the mass transport and the diffusion path of the feedstocks and products.…”

“…However, acid sites can be introduced by substitution of silicon into the framework of the AlPOs, which results in so‐called siliconaluminophosphates (SAPOs). Among SAPO materials, SAPO‐34 with a CHA framework structure has been attracting considerable interest in methanol to hydrocarbon reactions, syngas to hydrocarbon reactions, and selective catalytic reduction (SCR) of NO x . The structure of SAPO‐34 (Figure ) consists of two composite building units, double‐six‐membered rings ( d6r ), and cha cages, which are joined together to form a three‐dimensional network of pores with 0.38 nm diameter windows connecting ellipsoidal cages with dimensions of 0.74 nm×1.1 nm…”

Modulating Cu+ distribution on the surface of Ce-doped CuO composite oxides for SO2-resistant NH3-selective catalytic reduction of NO

“…Among various attempts, copper-based catalysts supported on oxides or zeolites have recently emerged as attractive candidates due to their environmentally benign characteristics and high SCR performance in a wide temperature range. [7][8][9][10] Co, Fe, Mn, and Ce have been doped into the phase or co-deposited with Cu on supports, such as zeolites, TiO 2 , and SiO 2 , to fabricate composite Cu-based NH 3 -SCR catalysts. Addition of these elements was found to be benecial for creating charge imbalance, vacancies or unsaturated chemical bonds on the catalysts surface, and practical contribution to the catalytic improvements for NH 3 -SCR-NO x .…”