2014
DOI: 10.1016/j.cattod.2013.10.047
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The role of pore size on the thermal stability of zeolite supported Cu SCR catalysts

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Cited by 125 publications
(109 citation statements)
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“…It can be expected that such a process depends on temperature, aging time and Cu loading, where higher aging temperatures, longer aging durations and higher Cu loadings promote more damage. Prior literature is fully in line with this structure damage mechanism [39][40][41]53,61] On the other hand, dealumination alone is apparently much less destructive for this zeolite catalyst.…”
Section: Towards Rational Design Of Cu/ssz-13mentioning
confidence: 60%
See 1 more Smart Citation
“…It can be expected that such a process depends on temperature, aging time and Cu loading, where higher aging temperatures, longer aging durations and higher Cu loadings promote more damage. Prior literature is fully in line with this structure damage mechanism [39][40][41]53,61] On the other hand, dealumination alone is apparently much less destructive for this zeolite catalyst.…”
Section: Towards Rational Design Of Cu/ssz-13mentioning
confidence: 60%
“…In contrast, hydrothermal degradation is typically irreversible due to permanent structural changes in the zeolite that result in, for example, loss of Brønsted acid sites and changes to the chemical or physical structure of Cu active centers. This explains why hydrothermal aging effects have been so extensively studied [39][40][41][52][53][54]. Prior studies have suggested that Cu/SSZ-13 durability enhancement can be achieved in a number of ways: (1) composition optimization, that is, choosing optimized Si/Al and Cu/Al ratios [31]; (2) zeolite particle size optimization [55]; (3) new synthesis methods development [30,[56][57][58][59]; and (4) introduction of stability enhancement additives.…”
Section: Towards Rational Design Of Cu/ssz-13mentioning
confidence: 99%
“…Fickel et al [15] suggested that the small pore openings in a CHA zeolite restrict migration of the dealumination product Al(OH) 3 , thus slowing down the dealumination process of the zeolite support. Using an in situ XRD technique, Blakeman et al [20] demonstrated that the undesirable Cu-Al interactions were minimized in a small-pore Cu-CHA catalyst, concluding that this was mainly due to pore restriction.…”
Section: Introductionmentioning
confidence: 98%
“…It restricts large hydrocarbons from entering the pores of the catalysts where the SCR reactions take place, minimizing the HC inhibition effect on SCR activity. In contrast, the openings in large-or medium-pore zeolite supports are large enough to allow most hydrocarbons to enter their pores, which can severely inhibit the SCR activity of the catalysts [1,14,20].…”
Section: Introductionmentioning
confidence: 99%
“…Moden et al [85] reported that the active Cu species in Cu-FER catalysts with smaller pore size (0.42 × 0.54 nm) showed higher stability than that in Cu-BETA catalysts with relatively larger pore size (0.66 × 0.67 nm). Using the in situ XRD technique, Blakeman et al [86] confirmed that the small pore structure in Cu-CHA catalysts could prevent the degradation of the zeolite framework structure by Cu species as compared to that in Cu-BETA catalysts, and the undesirable Cu/Al 2 O 3 interaction at high temperatures might play an important role in the catalyst deactivation process. Fickel et al [87] also believed that the higher hydrothermal stability of the Cu-CHA catalyst was related to its small pore structure (0.38 × 0.38 nm).…”
Section: Hydrothermal Stability and Hc Poisoning Resistancementioning
confidence: 91%